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Rev. DEC 2010 5-1 CHAPTER 5 SANITATION LEARNING OBJECTIVES: Upon completing this chapter, you should be able to do the following: — Identify the different food-borne illnesses. — Identify the different types of poisonings. — Identify the principles of personal hygiene. —Identify the principles of food service equipment. —Identify the principles of food service spaces. —Identify semi-perishable, perishable food products. —Identify defense of Chemical, Biological, and Radiological Agents. INTRODUCTION In a foodservice operation, nothing rivals the importance of sanitary food preparation and ser- vice. Carelessly handled food is easily contaminated with pathogenic organisms that may lead to il l- ness. This chapter discusses the methods of preventing illnesses arisin g from poor sanitary practices in the preparation and service of food. In addition to the hazards of food contamination, with which Culinary Specialist (CS) personnel have always contended, modern warfare has added other hazardous—chemical, biological and radio- logical agents that may be used in any future war. Protection of the food supply and decontamination measures in the galley and messing areas are vital to the defense of the ship or station. FOOD-BORNE ILLNESSES Food-borne illnesses can incapacitate large numbers of personnel in a short period of time. In addition to the toxins or poisons produced by bacterial growth, certain foods are inherently or naturally poisonous. The poisons in these foods tend to attack the nervous system resulting in such sy mptoms as weakness or paralysis, numbness, tingling of the ears, apprehension and even death. Food-borne illnesses can be classified into the three following basic types: natural or chemical food poisoning, food intoxication and food infection. NATURAL or CHEMICAL FOOD POISONING Both natural and chemical food poisonings are caused by man —man‟s carelessness, indiffe- rence, or ignorance. Natural and chemical food poisonings are grouped together as one food -borne illness because they both occur naturally. The characteristics that differentiate natural and chemical poisonings are discussed next.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-2 Natural Food Poisoning. In this type of food -borne illness, the food in its natural state co n- tains elements poisonous to humans. As a CS, you work with many new foods that are not common to the United States. Some of these foods are from plants and animals that can cause severe illness and even death when consumed. Every effort is made to keep poisonous plants off a ship. However, sometimes they do get aboard. Toadstools, hemlock mussels (such as those found on the West Coast during the summer), tropical fish (such as toadfish, puffing fish and certain members of the jack fish family), and in tropical waters, at certain seasons of the year, barracuda can cause poisoning and death. Some types of mu- shrooms also contain natural poisons. Only an expert can decide whether a certain mushroom is fit to eat. The safest rule is never to use unfamiliar foods unless your medical officer approves their use. Chemical Food Poisoning. Some food-borne illnesses are caused by chemical poisons. In the case of chemical food po i- soning, the poisons are introduced into the food accidentally. The following types of chemical poiso n- ing may be experienced in foodservice operations. Antimony Poisoning - Antimony poisoning is caused by eating food cooked in poorly coated or chipped enameled cooking utensils. Cadmium Poisoning - Cadmium poisoning may take place if chilled acid foods or drinks are al- lowed to stand in cadmium-plated metal containers before they are served. Illness may strike 10 to 15 minutes after the food is eaten. Lemonade, fruit punch, toma toes, raspberry gelatin dessert and tea containing lemon juice can be contaminated by cadmium. In addition, ice trays and metal pitchers plated with cadmium can cause chemical poisoning when filled with cold acid foods. Cyanide Poisoning - Cyanide poisoning may result if silverware is not properly washed and sanitized after detarnishing. Zinc Poisoning - Zinc poisoning in food is rare. It may occur when acid foods are cooked in galvanized iron kettles. Outbreaks have occurred when apples have been cooked in this type of ke t- tle. Lead and Arsenic Poisonings - Lead and arsenic sometimes used to spray vegetables may cause these foods to become poi sonous. Be sure all fresh fruits and vegetables are thoroughly washed before you cook them or before they are eaten raw. Lead poisoning may also result from the ingestion of food or water that has been in contact with lead pipes, lead-plated equipment and lead- soldered pots and pans. Lead is a cumulative poison; the accumulation of small doses in the body will eventually cause chronic lead poisoning. Fluoride Poisoning - Fluoride poisoning is caused by sodium fluoride, a substance often used to get rid of cockroaches. Sodium fluoride is a white powder that can be easily mistaken for powdered milk. Keep all containers of such poison out of the galley and bakeshop. Methyl Chloride Poisoning - Methyl chloride poisoning is caused by leaking mechanical refr i- gerators. Check your equipment for such leaks and request scheduled Planned Maintenance Service (PMS) from the engineering department to detect faulty equipment.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-3 FOOD INTOXICATION This type of illness is caused by toxins. Under favorable conditions certain bacteria produce chemical compounds called toxins . If ingested, toxins cause food intoxication. Staphylococcus is the most commonly reported food intoxication. Staphylococcus The staphylococcus germ is found particularly in the hair, in the throat, in pimples on the skin, infected cuts, boils and in great abundance in the postnasal drip of people recovering from colds. Consequently, the most prevalent carrier of food intoxication is foodservice personnel. People with any of these symptoms must not be allowed to work in food preparation spaces in any capacity. Foods most associated with outbreaks of staphylococcus are pork products and fowl. Ham is also susceptible to staphylococcus poisoning and must not be sliced too far in advance of serving u n- less properly refrigerated. Other foods commonly involved are potted meats, fish, cheese, milk products (including cream- and custard-filled pastries), and potato and macaroni salads. Foods can contain sufficient to x- in to cause food poisoning and yet have no odor of spoilage and no abnormal taste. Even when food has been properly refrigerated, it can become cont aminated by bacteria while it is being prepared or while it is standing in the galley before it is served. E Coli (Escherichia coli) Escherichia coli (E. Coli) are large and diverse group bacteria. Although most strains of E. Co- li are harmless, others can ma ke you sick. Some kinds of E. C oli cause disease by making a toxin called Shiga toxin. The bacteria that make these toxins are called “Shiga toxin -producing” E. Coli or STEC for short. Botulism Botulism, usually fatal, is caused by the toxin produced by the rod -shaped bacterium called clostridium botulinum. Botulinum organisms are found in the soil and gain access to foods through contact with soil, d ust, and possibly water. The foods most often responsible for botulism are either canned or fermented foods in which the preserving process has not succeeded in destroying the ba c- teria in the food. The botulinum grows and multiplies in an airtight contain er. However, when cans are damaged, leak, bulge, or are sprung, the contents are presumed to be unsafe. The botulinum organisms sometimes produce a gas and cheesy odor in food, but the absence of these signs does not necessarily mean that the bacteria are not present. FOOD INFECTION This type of food illness is caused by microorganisms s uch as the salmonella, shigella and clostridium species and the streptococcus, bacillus, and typhoid fever bacteria. A large percentage of food infections are transmitted by foods that have been allowed to remain at room temperature for a prolonged period of time. The great majority of outbreaks of food infection are caused by meat (poultry, particularly tu r- key) and meat mixtures. For this reason, poultry dressing should not be served as a leftover. Other foods that may be involved are custards, milk cream, ice cream, seafood, meat, eggs, meat products,
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-4 shellfish, salads, mayonnaise, salad dressings, poultry dressing, bread puddings, cream pies, éclairs and filled pastries These microorganisms are transmitted to the food by personnel who are sick or are carriers and who are allowed to handle food in the food-preparation area. Salmonellosis Salmonella bacteria are transmitted by foods, usually from undercooked or semi -cooked raw foods, or from foods that have become infected after cooking by persons who are harboring the ba c- teria. Since salmonella bacilli leave the body through the intestinal tract, the main source of salmone l- la infection is people who do not wash their ha nds after leaving the head. Consequently, they cont a- minate all the food they handle. In addition, mice, rats and cockroaches may contaminate food by dragging filth over food and food utensils, or by intestinal deposits that are brushed off into food or containers. While no specific foods are responsible for salmonellosis, the ones most likely to harbor the salmonella bacilli are (1) those that are usually eaten raw such as salads and greens; (2) cooked le f- tover foods that are not reheated thoroughly; (3) f oods that are undercooked, especially poultry and uninspected meats; and (4) infected eggs that are eaten raw or undercooked. See “Safe Egg - Handling Guidelines” in Chapter 1 of NAVMED P-5010. Streptococcus Infections such as septic sore throat and scarlet fever are transmitted by contaminated milk and by certain other foods, including meat, meat products and dressings. One type of this infection al- so causes a gastrointestinal disturbance. Floor dust is one of the modes of transmission. Typhoid Fever Typhoid fever is transmitted by milk, shellfish, or water supplies that have become polluted with the urine or feces of a person harboring the organism of this disease. It is also spread by human carriers and flies that transport the typhoid bacteria from s oiled articles to foods, dishes and cooking utensils. Bacillus Dysentery Bacillus dysentery is transmitted by contaminated foods or water, by human carriers, or by flies. The bacilli of this disease are found in the bowel discharges of infected persons. Infectious Hepatitis Infectious hepatitis is a form of liver disease with symptoms of general discomfort. Jaundice, often characterized by skin yellowing and other signs of liver injury are sometimes present. The di s- ease is highly contagious. Drinking water or unsanitary conditions and flies or other biting insects may transmit the infectious material. ANIMAL PARASITES Animal parasites sometimes enter the body in food and produce infections. Some of these forms of animal life are one-celled. All are so tiny that they are not visible when the food is being pr e- pared.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-5 Amoebic Dysentery This illness is caused by a one-celled animal, the amoeba. These organisms eat the red blood corpuscles of the body and the cells that line the intestines. The dysentery -producing amoeba is transmitted by foods served cold and moist, such as celery, lettuce, other fresh vegetables, or fresh berries. These foods may be infected by human earners, by flies, or by having been grown in fields where animal excreta was used as fertilizer. Trichinosis Eating infected pork that has not been thoroughly cooked is the most common cause of trich i- nosis. All fresh pork products must be cooked to an internal temperature of 165°F for 15 seconds or above to kill the trichinella worm. Since there is no way of knowing whether or not this parasite is present, the pork must always be thoroughly cooked. Beef Tapeworm Infection Beef tapeworms are transmitted by infected beef that has not been cooked long enough to kill the encysted larvae. To prevent ingesting the beef tapeworm, only government-inspected beef should be used. If it is necessary to use beef that has not been inspected, freeze it at 14°F or below for 5 days or longer, or pickle it in a 20 to 25 percent salt solution for 5 days or longer. Cook beef well-done. Never serve it rare. Fish Tapeworm Infection Fish tapeworm is transmitted by infected fish that has not been thoroughly cooked. For pu r- poses of safety, always ensure that fish is thoroughly cooked and is never tasted in the raw state. MOLDS AND YEASTS Other types of cell life that may not be harmful are molds and yeasts. Molds Molds are composed of many cells and maybe very small or large enough to cover an entire wall. They grow best in dark, damp places where temperatures are fa vorable. Molds also grow well in acidic food with little moisture, (examples jams, jellies, and cured, salty meat such as ham, bacon, sa- lami). Some molds are valuable in the production of medicines such as penicillin; other molds may cause certain infections in human beings. Molds spoil the taste of food and eventually destroy it. Molds may be removed from certain foods and the remainder of the food used. Consult your medical department on the precautions to be taken. Yeasts Like bacteria, yeasts are sin gle-celled. Signs of spoilage can include a smell or taste of alc o- hol. They reproduce by budding. The yeast itself looks white, pink discoloration or slime. When a bud becomes sufficiently large, it separates from the original cell and becomes an independ ent cell. Cer- tain yeasts are used in bread making, vinegar fermentation and the manufacture of beverages.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-6 FOOD PREPARATION It is evident that the foodservice worker is the most important link in the transmission of di s- ease through food. The workers‟ heal th, personal habits, understanding of bacteria and the methods of preparing and serving of food are of concern not only to themselves but also to their shipmates as well. Bacteria An understanding of bacteria is valuable to all personnel and essential to those who work with food in any way. Bacteria are one-celled microorganisms so small they are visible only under a micro- scope. They are widely dist ributed in the air, water, soil and in animal and plant tissues. Bacteria are classified according to their shape. Those round in shape are called cocci , the rod-shaped ones are called bacilli, and the spiral-shaped ones are called spirilla. Since bacteria ca nnot be seen, our best defense against the harmful bacteria is strict adh e- rence to sanitation principles. Bacteria can move of their own accord only in liquids and cannot leave a fluid surface unless transported as “passengers” by other agents such as dust, food dishes, silve r- ware, cooking utensils, dirty fingers or fingernails, a common drinking cup, a hand towel, water, i n- sects, or rodents. Bacteria reproduce themselves simply by dividing in half. On the average each bacterium, u n- der favorable conditions, will divide and become two bacteria every 20 minutes. The rate of multiplica- tion or growth of bacteria is affected by heat or cold. Certain types of bacteria, if allowed to grow and multiply, produce toxins that cause food poisoning. Boiling will kill all bacteria, but it will not kill the tox- ins once they are allowed to form. Certain strains of the staphy lococcus bacteria will withstand boiling temperature for long periods of time before they are killed and are virtually impossible to kill by normal cooking methods. Once toxins have been allowed to form, no amount of cooking will make the food safe. Refrigeration will prevent the bacteria from producing toxins but will not kill the toxins once they are formed. FOODSERVICE PERSONNEL Since foodservice personnel are considered to be the most likely mode of transmission of di s- ease through food, certain requir ements such as medical ex aminations, sanitation training and per- sonal hygiene must be completed before such personnel can work in food preparation areas. Physical Examination All foodservice personnel including personnel employed by civilian contract ser vices must be examined and determined to be free from communicable diseases before initial assignment in foo d- service. Subsequent physical examinations will be conducted annually. The physical examination must be sufficiently comprehensive to detect acute o r chronic diseases. Laboratory tests and other diagnostic determinations are performed at the discretion of the senior medical officer; however, all foodservice personnel must be examined for evidence of tuberculosis. Employees of contract services must be examined by either local or military medical departments to make sure a complete and th o- rough physical examination has been done. Personnel having any open lesions, particularly on the hands, face, or neck or acne on the face, are prohibited from performing foodservice duty.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-7 Examination of personnel with questionable medical or social histories must be comprehe n- sive including X -ray of the chest, stool and urine examinations for p arasite and bacterial pathogens and other such determinations as may be indicated by international agreements. All personnel must repeat medical tests when away from duty for 30 days or more. All perso n- nel must submit to laboratory examinations and other tests to detect and treat acute or chronic di s- eases and be relieved from duty if they are infected. Training All foodservice personnel must be thoroughly indoctrinated in personal hygiene and food san i- tation, as well as in the methods and importance of preventing food-borne illness. Temporary foodser- vice personnel must be indoctrinated as follows: All foodservice personnel will receive a minimum of 4 hours initial training and 4 hours annual refresher training in foodservice sanitation principles All foodservice sanitation training will be conducted by environmental health officers, preven- tive medicine technicians, or any E-5 and above. In those cases where it can be shown that environmental health officers or preventive med i- cine technicians are not available to perform such training, medical department representatives, CSs in paygrade E-5 and above, or civilian foodservice supervisors who have received special training to qualify them as foodservice sanitation instructors maybe used. Special instructor certification training may be taken at either a Navy environmental and preve ntive medicine unit or Naval regional medical center preventive medicine service, and completion of training must be documented. Certified instruc- tors must use and maintain up-to-date, standard Navy lesson plans in their training programs. Instruc- tors must be recertified every 5 years and are authorized to sign the Foodservice Training Certif icate, NAVMED 4061/1. Personal Hygiene The group of principles and rules designed to promote personal health and cleanliness is known as personal hygiene. The following procedures should be used to ensure personal cleanliness. TAKE DAILY SHOWER OR BATH .—Maintain a high degree of cleanliness by thoroughly soaping and rinsing the body to remove dirt, perspiration and bacteria. This practice improves circula- tion, appearance, and health, and is the foundation of personal hygiene. Frequent washing of hair is mandatory. Keep teeth clean by brushing at least twice daily, but preferably after each meal. WEAR CLEAN GARMENTS.—Wear clean inner and outer garments. Germs are harbo red in clothing as well as on skin surfaces, and diseases are likely to be transmitted. Caps (or hairnets for women) completely covering the hair must be worn at all times when working with food. Keep hair trimmed for neat appearance. Change clothing and aprons soon after soiling. WASH HANDS BEFORE, DURING AND AFTER WORKING WITH FOOD.—Provide plenty of hot and cold running water under pressure. Soap and paper towels with adequate waste receptacles must be available. Continuous rolled paper toweling that is sanitary may be used if it is approved by the National Sanitation Foundation (NSF) Testing Laboratory or meets equivalent standards, but use of such toweling must be supervised. Thorough washing of hands with hot soapy water to remove soil and contaminat ion before commencing work is mandatory. After each visit to the toilet, all food handlers are required to scrub
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-8 hands and nails. When interruptions occur during routine duties in the galley, personnel are required to wash their hands before resuming work. Frequent washing of soiled hands during work is also e s- sential. Never wear an apron to the toilet or washroom. Hands are the most common vehicle for transmitting germs. Personnel shall keep fingernails closely clipped, trimmed, and cleaned underneath and around cuticle. Cleaning is effective only with soaps or detergents and warm water. Unless clean single-use towels or other satisfactory hand-drying devices are provided, the benefits of frequent hand scrubbing are completely nullified. PROHIBIT USE OF TOBACCO—Smoking in food preparation, serving, or dishwashing areas is prohibited. The use of tobacco while preparing or serving food may contaminate the fingers and hands, with saliva and may promote spitting and coughing, which transmit disease organisms present in the saliva to food or food -contact surfaces. If smoking areas away from the galley are provided , personnel should use these designated areas but thoroughly scrub their hands before resuming work to prevent food contamination. DEVELOP SANITARY WORK HABITS—A wide range of communicable diseases and infe c- tions may be transmitted by food handlers to other personnel, through contaminated food and car e- less practices. Some of the desirable work habits that personnel should develop to prevent personal co ntam- ination areas are as follows: Spoons, knives and forks should be picked up or touched only by their handles Cups, glasses and bowls should be handled so that fingers and thumb do not contact inside surfaces or lip-contact surfaces Portable-and fixed-food preparation equipment should be stored so that they require mini- mum handling by personnel. Improper storage ruins the effect of sanitizing, and excess han- dling will introduce contaminating material Disposable dinnerware must be handled and dispensed to prevent contamination of surfaces that come in contact with food or with the mouth of the user Tongs, picks, spatulas, scoops, dipping spoons and other suitable utensils must be used in such a manner to keep manual contact with food at a minimum. REPORT PERSONAL ILLNESS AND ALL MINOR INFECTIONS. — Boils and sore throats are sources of bacteria that can cause severe food -borne diseases. When ill, report it and make a r- rangements to be relieved of duty. Sores, rashes of any kind, pimples, or other skin e ruptions as well as cuts should be reported and medical aid solicited as soon as possible. Both supervisory personnel and operators are responsible for notifying medical personnel if a disease is suspected. APPLY PROFESSIONAL TRAINING AND TECHNIQUES. — All personnel must be alert to the hazards associated with speedup methods and shortcuts to washing and sanitizing operations. Tec h- niques of sanitizing — including times, temperatures, and routines —should be memorized and a p- plied. The effectiveness of sanitation is directly related to the competence and cooperation of foodser- vice personnel. COMPLY WITH SANITARY REGULATIONS. —Public health ordinances and regulations i m- posed by the Bureau of Medicine and Surgery (BUMED) must be observed in day -to-day foodservice
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-9 operations. Recognized standards of sanitation embracing accepted public health principles are pr e- scribed by these sources and administration of regulations at each activity will be enforced. PRECAUTIONS Most food-borne disease outbreaks are due to four factors: (1) Preparation of food too far in advance. (2) Poor refrigeration of food. (3) Careless handling of food. (4) Failure of personnel to follow good personal hygiene habits. The following precautions should be observed in preparing and serving food: Food should be served promptly after it is prepared Any food that has been ground or chopped and is to be cooked later or incorporated in a prepared dish must be refrigerated immediately. Such ground or chopped food should be re- frigerated until cooked; once cooked, they should never be saved as leftovers. When food is ground, an increase in the area of contamination and growth of harmful bacteria results. When chilled foods are ground, the grinding process warms the food to the point where bac- teria growth may start If you are using individual serving containers, do not put ice on top of containers All fresh pork roast products must be cooked to an internal temperature of 165°F for 15 seconds or above. Never serve raw pork products Poultry shall be cooked to an internal temperature of 165°F for 15 seconds. Roast shall be cooked to an internal temperature of 145°F for 4 minutes Ground meals shall be cooked to an internal temperature of 155°F for 15 seconds Steaks / pork chops / seafood and eggs shall be cooked to an internal temperature of 145°F for 15 second Keep foods covered at all times except during actual preparation and serving Palletize all subsistence items in storage spaces (six inches off the floor and four inches away from the wall) to facilitate cleaning and air circulation Keep all worktables and benches clean at all times Store food off the deck Keep food preparation utensils, meat grinders and other similar equipment clean and handle them properly. Food that comes in contact with equipment that is contaminated becomes contaminated also Wash your hands before, during and after preparing food Do not cough, sneeze, or talk over food while it is being prepared or served
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-10 Never smoke while you are preparing food. Saliva can be dropped on foods very easily when you are smoking Never eat or drink in food service preparation areas Keep fingers away from the mouth, lips and face Keep bare-hand contact with foods during preparation to a minimum. Handle foods as little as possible Use tongs or single use gloved hands to handle butter, doughnuts, bread and other similar items of food (any ready to eat foods) Handle foods as little as possible Use tongs to handle butter, doughnuts, bread and other similar items of food. Do not use your hands. Inspections To make sure all foodservice division rules and directed procedures are being followed, the food service officer and/or designated assistants should make both unexpected daily inspections and thorough weekly inspections of all foodservice personnel, spac es, and operations. As an aid to co n- ducting an inspection, the following items should be checked: Food handlers. Clean personal appearance that includes clean working uniform (including apron and cap), haircut, clean shave, close-clipped fingernails, head covering, neatness in dress and absence of cuts, sores, acne, or other indications of skin disorders on exposed parts of head, hands, arms and wearing no unauthorized jewelry (only a plain band ring is au- thorized for wear) Galley. Deck drains, sinks and grease traps must be clean and free of any dirt and food par- ticles. Inspect for insect and rodent infestation Ranges and grills. Clean and free from grease (ovens, unit cover, drip pan, range grease re- ceptacles, hood and hood filters) Can opener and base. Clean and free from accumulated grime and food particles Deep-fat fryers. Clean, coils clean, basket clean and in good condition Steam-jacketed kettles. Clean under cover and cover-exhaust opening; lids and spigots easi- ly removable without tools for cleaning. Drain clean and free of food particles Ovens. Clean and free of burned food and food particles Sinks and galley utensils. Clean and neatly stored; steel and plastic sponges (but not steel wool) used for cleaning galley utensils are clean and free of food particles, air dried and neat- ly stored Mixing machines and attachments. Clean and in good operating condition, ice-cream ma- chine, meat and vegetable grinders and attachments, and proof boxes Cutting boards. Clean and dry, no evidence of cracks, scoring or pitted surfaces Vegetable-preparation room. Inspect for cleanliness of deck, drains, traps, and sinks. Look for any sign of insect and rodent infestation
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-11 Potato-peeling machine. Dismantled (cover and disk removed), wash-water strainer clean and in good condition Slicing and dicing machine. Dismantled, clean (parts oiled if not in use), and in good condi- tion Dining area. Inspect for cleanliness of decks, tables, benches, serving tables, coffee urns, milk dispensers, warming ovens, water fountains, and ice machines; all gear clean and neatly stored. Look for insect and rodent infestation Scullery. Decks and gear must be clean. Dishwashing machine dismantled, clean and free of odors, spray pipe clean, racks clean and in good condition, curtains clean and in good condi- tion, thermometers operating properly, and trash and garbage cans clean and tightly covered The scullery machine must be descaled every 30 days Garbage and trash room. Clean, orderly and free from obnoxious odors; cans clean and tightly covered. Inspect for insect and rodent infestation The 4-Hour Rule Protein foods that are not served immediately after they are cooked should either be chilled to temperatures of 41°F or lower (but not frozen) or held at 135°F or higher. Protein foods include meats, fish, poultry, gravies, meat stocks, soups, eggs, custards, cream fillings and milk. Growth of harmful bacteria and the development of toxins (poisons) formed by the bacteria occur rapidly in cooked pro - tein foods during holding at temperatures be tween 41°F and 135°F. Cooked protein foods that have been held at temperatures between 41°F and 135°F for more than 4 hours will be considered unfit for consumption and must be destroyed. Label all food items once preparation is complete to determine the four hour window. This principle is known as the 4 -hour rule. If the product is refrigerated at intervals and then permitted to warm up, the total time of the various periods between 41°F and 135°F must not be more than 4 hours. Protein foods composed of ingredients that are hand-peeled, hand-sliced, or hand-diced after they are cooked should never be used as leftovers; the 4 -hour limit between temperatures of 41°F and 135°F is usually taken in preparing, chilling and serving the food. These foods include pota- to, chicken, macaroni, shrimp and egg salads and similar items. Hand preparation not only increases the chance of contamination, but also generally increases the length of time that these foods are held at room temperatures. In addition, it is dangerous to return opened jars or bowls of mayonnaise and cooked salad dressing from the salad bar to the refrigerator for reuse at a later meal . The danger is because of the danger of miscalculating the total time that elapsed from the time that these salad dressings were held at temperatures between 41°F and 135°F. Holding Temperatures Holding temperatures are of utmost importance. Food held at temperatures that are too high or too low can ruin both the taste and the appearance of food as well as increase the risks of food - borne disease. HOT FOODS—The holding temperature (internal product temperatures) of hot foods held on a serving line should be maintained above 135°F. COLD FOODS—Keep cold foods (internal product temperatures) such as salads, potato salad combinations and ham plates cold by setting them on ice or on refrigerated salad bar units maintained between 34°F and 40°F.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-12 BEVERAGES—Beverages should be served hot or cold as applicable. As with food, the qual i- ty depends on proper preparation, holding and dispensing. Leftovers When leftovers or warm foods are chilled, care must be taken to ensure prompt and thorough chilling (41°F or below) to the center of the food mass. Foods that are to be refrigerated should be placed in shallow pans to a depth of not more than 3 inches and must be covered with lids or waxed paper. Do not put leftovers in large, deep pans. Chilling the food may take so long to reach the center of the food mass that harmful bacteria have sufficient time to grow, and toxins have time to develop. Guard against any procedure that might delay cooling. Place foods to be chilled in the chill box imm e- diately. Do not save l eftover food for more than 24 hours. Freezing of leftovers is prohibited. Foods composed of ingredients that have been peeled, sliced, or diced by hand after cooking must never be used as leftovers since the 4 -hour limit between temperatures of 4 1°F and 135°F is usually taken up in preparing, chilling and serving the food. To prevent miscalculations in the length of time lef tovers have been stored, all leftovers must be labeled with the date and time of preparation. Frozen Foods Frozen foods should be thawed in the refrigerator or cold running water. Freezing breaks down tissue and, therefore, foods can be invaded by germs more rapidly. Once foods are frozen and then thawed, they must not be refrozen. If not eaten, they should be stored under 41°F. Milk and Milk Products Milk and milk products and other protein foods frequently transmit infectious diseases to hu- mans because of their rapid rate of perishability. Strict surveillance of all handling proce dures from cow to humans is necessary to prevent contamination and possible milk-borne diseases. When procured by Navy and Marine Corps activities, milk and milk products mu st conform in all respects to either federal or military specifications (an approved source). The perishability of such products is a most important factor, thus strict compliance with all sanitary requirements is mandatory. Delivery inspections of dairy products are normally conducted by personnel attached to the re- ceiving activities. These inspectors must make sure milk and milk products are from approved sources and delivered in containers that are in good condition and properly sealed. They must make sure the temperature of the product on delivery is 4 5°F or less or follows the current Defense Supp ly Center Philadelphia (DSCP) contract. Of prime importance to medical and foodservice personnel is the maintenance of recom - mended temperatures in storing, (41 or below), dispensing (32-41°F) and enforcing approved sanitary methods in the handling of such products. Fresh Fruits and Vegetables Fresh fruits and vegetables should be washed thoroughly under running water to remove any particles of dirt or to remove poisonous insect sprays. Green vegetables of uncertain origin should be suspected of being contaminated with pathogenic organisms. They should be chemically sanitized by immersion for at least 15 minutes in a 100 -ppm (parts per million) available chlorine solution, or 30 minutes in a 50-ppm available chlorine solution, or other approved method. Then they should be th o- roughly rinsed with potable water before they are cooked or served. Head items such as lettuce, ca b- bage, or celery must be broken apart before they are sanitized.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-13 Canned Products Canned foods that appear abnormal in odor or appearance should never be eaten or even tasted, but should be discarded. When you are inspecting canned meats, f ish, poultry, vegetables, fruit and juices, the following factors should be considered: CAN LABELS—Check to make sure contents and processing date are stamped on the end of the container or on the label CAN EXTERIOR.—The exterior of the can should be examined for general appearance, dents, swelling, rust and pinholes. Cans having severe dents that cross either the side or end seams or that crinkle the side, should not be used. Rusty cans will not be used. Cans with rust that cannot be easily wiped off with a clean cloth will not be used CAN INTERIOR.—Contents should be removed, the can rinsed and the interior examined for pinholes against a strong light. If pinholes are present, contents should be discarded CONTENTS—Contents of can should be examined for characteristic odor and appearance of the product REJECTION OR SURVE.—Except for coffee and molasses, foods contained in cans display- ing the following conditions are unsatisfactory and should be surveyed and disposed of: Pinholes-Tiny holes caused by action of food acids during prolonged storage Swells (o r swellers). B oth ends of cans bulge outward because of bacterial action and gas production. Ends do not yield to finger pressure. (Molasses may bulge in tropical areas, but this condi- tion is not dangerous and the product need not be rejected for this reason). Springers. One or both ends bulge outward because of bacterial action and gas. However, this bulge will yield on pressure and spring back to bulge condition on release. Springers or swellers of coffee containers, however, usually indicate a properly sealed container that has merely retained nat- ural coffee-bean gases. Flippers. Both ends are flat, but one end will bulge out ward when the opposite end receives pressure. This condition is caused by either bacterial action or chemical action resulting in gas pro- duction. Spoiled or Damaged Food Products Several precautions eliminate the factors that cause spoiled or damaged food items. These precautions include inspection for quality upon receipt, proper storage and handling and maintenance of required temperatures relative to each respective phase of the operation. The absence of any one of these precautions may encourage food spoilage and damage. The following hazardous material should be disposed of accordingly, using the applicable su r- vey procedures outlined in NAVSUP P-486: Cans in unsatisfactory condition or cannot be surveyed Food products with spoilage or damage indicated by offensive odors, presence of slime, ab- normal color, or other evidence of deterioration
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-14 Food items adulterated by easily recognizable foreign material, such as metal, glass, dirt, or insects. Do not attempt to taste or cook food in these states. It is safe to observe the old saying, “When in doubt, throw it out.” „The risk of food -borne illness must be avoided. After any occurr ences of spoiled or damaged food, corrective actions must be provided and measures must be designed to prevent future occurrences. KEEPING UTENSILS and EQUIPMENT CLEAN All phases of sanitation in a General Mess are important. However, one of the most imp ortant is the proper cleaning and sanitizing of equipment (including trays, dishes and other dinnerware) used for preparing, handling, cooking and serving food. Dishes may be washed by hand or by machine. Whatever the method, either the final results may be excellent or they may be poor, depending upon how conscientiously you apply your kno w- ledge and skill in using the equipment and materials provided. The best equipment and detergents will not do a good job of dishwashing if used improperly. Types of Soil Unless the galley equipment and utensils are thoroughly cleansed, food particles in which bac- teria may grow will remain on them. These food soils are divided into several distinct types: Freshly deposited soil. The soil that remains immediately after the equipment or utensil has been used Thin film. The soil that remains as the result of ineffective cleaning, following a flushing with water. Thin films are not easily seen and they are capable of sustaining germs Built-up deposits. The result of repeated ineffective cleaning methods causing a day-by-day accumulation of soil Dried deposits. Accumulations that result from drying action and formation of a heavy crusty deposit Baked deposits. Baked deposits are deposits that are baked onto equipment and that have become difficult to remove. Removing Stubborn Soils The Navy procures the correct type of detergent to be used in washing food preparation ute n- sils and equipment. Hot water also provides temperatures that increase the chemical activities of the various ingredients in properly compounded detergents. Friction is an important part of cleaning. The required friction may be applied by brushing with approved brushes or by strong flushing, as in di s- hwashing machines. A hard abrasive should never be used on any metal surface. This results in scratches that provide lodging places for soil. It is recommended that pots and pans, cooking utensils, and other such items be presoaked to loosen any food clinging to the utensil. Then, they should be washed using the proper detergent compound and hot water. A detergent increases the effectiveness of the water as a cleaning agent. The washed pots and pans must be rinsed with warm water at 120°F to 140°F, and then sanitized for 30 seconds in hot water of 17 1°F or for at least 1 minute in an approved chemical sanitizing solution such as the standard stock chlorine -iodine type. Once washed,
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-15 sanitized and air dried the clean pots and pans should be stored, bottoms up, in clean racks. Othe r- wise, the effort spent in washing and sanitizing them is wasted. Hand Dishwashing Thoroughly cleaned and sanitized food service dishware, utensils and equipment not only con- tribute to the aesthetic quality of a food service facility, but more importantly, prevent the transmi ssion of disease-producing microorganisms that may be found on such utensils and equipment. Therefore, the importance of thorough cleaning and sanitizing cannot be overemphasized. Utensils and equipment including removable equipment components may be washed by the manual or machine method; however, when available the machine dishwashing method is preferred. Whichever method is used, the final results will depend on the super vision, knowledge, skill and con- scientiousness of the personnel doing the di shwashing and the equipment and materials provided for their use. All dishwashing personnel and their supervisors must be alert to the hazards associated with so-called "short cuts" and slipshod procedures for dishwashing and sanitizing. A sufficient supply of dining gear must b e available to prevent the recycling of inadequately cleaned, wet or hot dishware and utensils. Care will be taken to prevent contamination of clean and sanitized dishware and utensils by eliminating the cross handling of soiled and clean items and protect ing the clean items from splashes or aerosols. Dishwashing areas must be designed and equipment placed so that the direction of flow of dishware and utensils is from the soiled areas (scrapping and preflushing) to clean areas (drying area) to minimize the possibility of contamination from the soiled articles. Multiple rack dishwashers must be installed so that the intake/discharge ends of the machine are oriented fore and aft aboard ships. This is to prevent cross contamination of rinse water with wash water by the ships roll characte- ristics. Adequate sanitary storage space will be provided to protect the cleaned and sanitized dis h- ware and utensils from contamination resulting from unnecessary handling, dust and splashes. Correct and approved procedures will be discussed in the following paragraphs. Additional i n- formation is contained NAVSUP 486. Manual Dishwashing Equipment A three compartment deep sink is basic for proper manual dishwashing procedures. If a three compartment sink cannot be provided, a tw o compartment sink and/or other containers, e.g., large kettle, may be used provided adequate provisions are made to accomplish the basic manual di s- hwashing procedures including scraping and preflushing, washing, rinsing and sanitizing. Accessory equipment and supplies required for proper manual dishwashing include a booster heater for the final rinse sink; thermometers for monitoring the final rinse water temperatures, a drip and drain basket for the final rinse, approved brus hes, hand dishwashing compoun ds and sanitizing agents. In addition adequate facilities are required for scraping and prefiushing, stacking soiled dis h- ware and utensils, and air drying cleaned and sanitized items. Procedures
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-16 Manual dishwashing entails four separate evolutions including scraping and preflushing to r e- move gross soil, washing in detergent and warm water to remove soil and grease, rinsing to remove residual detergent and grease, and sanitizing to eliminate pathogens. Scraping and Preflushing Scraping and preflushing is ac complished to remove residual food matter which would pose an excessive organic load on the wash water and detergent. Gross food and trash are removed with a rubber spatula, approved brush or gloved hand, and deposited in a garbage receptacle. The surfaces of the dishware and utensils are then flushed with warm water (about 110 degrees F to 120 degrees F) to remove excess soil and grease. This can be accomplished in a warewashing machine with a prewash cycle, under a running faucet or in a deep sink. If the latter method is used, the sink must be emptied and cleaned prior to its use for washing or rinsing. Flatware (knives, forks and spoons) should be soaked in warm water (120 degrees F to 125 degrees F) containing 3 ounces of hand dishwashing compound per gallon of water as soon as poss- ible after they are collected. When the presoak water becomes dirty or greasy it should be changed. Experience has shown that the capacity of the wash water to clean dishware and utensils i n- creases significantly when thorough scraping and preflushing is accomplished. Damaged flatware should be segregated for proper disposal at this point. Washing Manual dishwashing is accomplished in a clean deep sink or other suitable container which is filled with warm water maintained at a temperature of not less than 110 degrees F, or the temperature specified on the label of the hand washing detergent or other cleaning agent. The cleaning agent is added according to the label. The amount of water in the sink or container must be known in order to mix the correct concentration. Dishware and utensils should be individually hand washed with an a p- proved scouring pad or other suitable implement. The wash water should be changed when it b e- comes dirty. This will be evident by a lack of suds or t he presence of a thin grease film on the water's surface. Glassware should be washed first using approved glassware brushes followed by flatware, dishes, and pots and pans, in that order, to minimize the frequency of water changes during the di s- hwashing operation. Pots and pans should be washed thoroughly inside and out by means of a scrub or scouring pad. Burnt food and difficult to remove stains can be removed by using a small amount of scouring powder and rubbing in a circular motion until the stain is removed. Rinse. The purpose of the rinse is to remove cleaning agents and food residues with potable water and prevent carryover into the sanitizing rinse. It is accomplished in the second deep sink which contains clean warm water (120 degrees F to 140 deg rees F is generally recommended). Some d e- tergent-sanitizers are used in both the wash water and the rinse water, check the label and mix as d i- rected. The rinse water or detergent -sanitizer solution should be changed when suds and/or grease begin to accumulate on the surface.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-17 Sanitizing Rinse. Dishware and utensils are sanitized in the third deep sink or other co ntainer by immersion for at least 30 seconds in clean hot water at a temperature of at least 17 1 degrees F, or for at least 1 minute in an approved chemical sanitizing solution such as the standard stock chlorine - iodine type. When chlorine chemical sanitizers are used, the immersion time may be reduced to at least 10 seconds provided one of the following combinations of pH, water temperature and concentra- tion of free available chlorine (FAC) is used. See Table 5-1 below. Drying and Storage. Dishware, glassware, pots, pans and utensils must be air dried and stored in a manner which protects them against contamination. Maintenance. The dishwashing area a nd equipment must be kept in good repair and cleaned before the operator leaves the area. Table 5.1 Methods to Reduce Chlorine Sanitizing Rinse Time to 10 Seconds Minimum Temperature Chlorine Concentration Degrees F pH 8.0 or less pH 8.1-10.0 120 23 ppm 25 ppm 100 50 ppm 50 ppm 75 50 ppm 100 ppm 55 100 ppm 100 ppm The equipment provided for manual dishwashing varies from a one -compartment sink to the preferred three-component sink. A remote dial thermometer and a booster heater shou ld be installed under the final rinse compartment. Regardless of the type of sink on board your ship or station. Machine Dishwashing Equipment Sanitary standards for dishwashing machines must not be less than those promulgated by Na- tional Safety Foundat ion ( NSF). Equivalent to NSF will be interpreted and understood to mean equivalent in all respects, including: comprehensive evaluation and testing of products by qualified professionals, unannounced inspections of production facilities, periodic re -evaluation of products, uniform interpretation of the standard, continuing objective evaluation against new revisions of the standard, enforcement procedures to assure against misuse of a listing or registered mark, free pu b- lished listing of accepted products, field investigation procedure available on request and a formal ap- peals process for evaluation to the standard or enforcement procedures. More extensive information may be obtained from the current NSF Standard No . 3, Commercial Spray Type Dishwashing M a- chines. NSF approved thermometers on the dishwashing machines will be maintained in good operat- ing condition at all times and must be verified to ensure accuracy by preventive maintenance perso n- nel during routine servicing and whenever a thermometer malfuncti on is suspected but not less than
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-18 once per month. The sensing element of the final rinse thermometer must be located to indicate the temperature of the water at the spray arms or manifolds. Each temperature gauge must be clearly marked to indicate the required temperature range. The low temperature shut-off switch that prevents the machine from running when proper water temperatures are not obtained must not be bypassed to allow the machine to run. Steam injection for heating dishwater in dishwashers deep s inks and serv- ing lines is prohibited. Dishwashing machines are classified as single or multiple tanks and stationary rack or co n- veyor type. They are designed to remove physical soil from all surfaces of dishware or utensils and sanitize them either by the application of hot water or by the application of approved chemical sol u- tions to the surfaces of the dishes or utensils. Operating specifications for each type of machine are listed in Table 5-2. The effectiveness of dishwashing machines is dependent on several factors: Scraping and Prewashing - These operations are very important because they reduce the o r- ganic load on the dishwashing machine, thus increasing its efficiency. Scraping and prewashing also remove large portions of soil and grease which result in more efficient machine operation. Racking - The proper placement of dishware and utensils in the dishwasher assures that all the surfaces will be exposed to the spray jets of wash and rinse water. Timing - Each stage of the dishwashing cycle is time d to provide the optimum exposure r e- quired to remove physical soil and sanitize the dishware and utensils. Volume and Velocity of the Water - The volume and velocity of the wash and rinse water affect the degree of soil removal by providing the necessary f orce to remove soil from the dishware and utensil surfaces and carry it away. Therefore; it is important that the spray arms and nozzles be kept free of obstruction to ensure dishware and utensils are exposed to the proper washing and rinsing ac- tion. Temperature of Water - In general, an increase in temperature of the wash water up to 150 degrees F aids in the removal of soil by decreasing the strength of the bond between the soil and the dishware surfaces increasing the solubility of the soil, and increasi ng the reaction rates. In addition, the cumulative effect of the temperatures of the wash and rinse cycles are necessary to obtain a mi n- imum temperature of 161 degrees F on the surface of the utensil to assure sanitization. Water te m- peratures less than tho se prescribed in Table 5-2 for wash or rinse water will result in ineffective washing and sanitizing. Dishwashing Agents - Dishwashing agents (detergents) facilitate soil removal by attacking the water insoluble matter which occurs on dishware and utensils , such as mineral depo sits, animal and vegetable fats and fibrous matter. In order for the cleaning agent to be effective, it must be compatible with the chemistry of the wash water, e.g., hard or soft water. Procedures Scraping and Preflushing. Dishware and utensils must be scraped and preflushed . Some ma- chines are equipped with an automatic preflushing function. In this event the dishware and utensils still require manual scraping before being placed into the machine. Sorting and Racking. Dishware and utensils should be sorted according to size and shape prior to racking. Separate racks must be used for articles of different types, e.g., cups, plates, bowls,
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-19 and glasses will not be placed in the same racks. Similarly, like items must be placed together on reckless conveyor type machines. Items must be racked in a manner that allows the surfaces to be exposed to the water spray and permits complete draining, overcrowding and haphazard racking must be avoided. Flatware will be individually scrubbed with a brush after presoaking to remove remaining food residues and placed in separate cylindrical shaped containers according to type, e.g., forks with forks, etc., with the eating surfaces facing up. Table 5-2. Time, Temperature, and Water Volume Requirements for Dishwashing Machines Wash Rinse Final Rinse at 20 PSI* Type Ma- chine Vol H2O Gal. Min.Expos- ure Sec. Min/Max Temp F. Vol H2O Gal. Min.Expos- ure Sec. Min/Ma x Temp F. Min Vol H2O Gal. Min. E x- posure Sec. Min/Max Temp F. Single Tank Stationary Rack 16 x 16 60 40 150-160 -- -- -- 1.15 10 171/195 18 x 18 75 40 150-160 -- -- -- 1.44 10 171/195 20 x 20 92 40 150-160 -- -- -- 1.73 10 171/195 Single Tank Stationary Rack, Single Temp 16 x 16 60 40 165 -- -- -- 14.7 30 171 18 x 18 75 40 165 -- -- -- 18.6 30 171 20 x 20 92 40 165 -- -- -- 23 30 171 Single tank Stationary Rack, Chemical Sanitizing
80 includes sanitizing rinse -- 120 -- -- -- 80 including wash vol. -- 120 Single Tank Conveyor, 20 “ Width
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-20
3 Per lin. inch c o- veyor 15 160 -- -- -- 6.94 min. Max. Conv. Speed 7' per min. 171/195 Multiple Tank Conveyor, 20” Width
1.65 per lin. inch con- veyor 7 150/ 160 4.65 per lin. inch con- veyor 7 160- 180 4.62 per min 15' per min. max. speed 171/195 *Pressure not less than 15 psi, not more than 25 psi, **Temp. at the manifold Machine Operation. The dishwashing machine should be operated in accordance with the manufacturer's instructions. Care sh ould be taken to ensure that the proper amount of appropriate dishwashing compound and rinse additives are used, the spray nozzles are not clogged, prescribed water temperatures and pressures are maintained, and the final rinse mechanism is operating sati s- factorily. Drying and Storage When dishware and utensils are washed and rinsed at the prescribed temperatures, and with proper use of machine dishwashing compound and drying agents, the drying time of properly racked items in an adequately ventilated room is a few minutes. A sufficiently large clean table area and adequate number of racks will be provided to permit sufficient holding time to allow the dishware and utensils to air dry before they are unloaded. The racks should be shaken to dislodge entrapped water and facilitate complete drying. The use of towels for drying dishware and utensils is prohibited. The dishware and utensils must be inspected at this point for cleanliness and the presence of residual detergent or grease films. Inadequately clean ed or filmy items will be rewashed and the cause of the occurrence investigated. Proper illumination in the space where dishware and utensils are air dried and inspected is of the utmost importance and must meet or exceed applicable illumin a- tion requirements. Care must be taken to avoid handling the food-contact surfaces of dishware and utensils once they have been cleaned and sanitized. All dining gear and cooking utensils must be stored off the deck and will be protected against contamination from dust, s plashes, aerosols and handling. Storage of dishware and utensils is proh i- bited in sculleries which have approved salt water garbage grinders (unless a separating deck to overhead partition is provided to isolate clean gear), locker rooms, toilet rooms, toilet room vestibules, garbage rooms, mechanical rooms, leaking automatic fire sprinkler heads, under exposed sewer lines, leaking water lines, or lines on which water has condensed.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-21 Maintenance. The dishwashing machine will be cleaned thoroughly at the end of each meal period following the instructions in the operating manual. Disassembly of spray arms, removal of scrap trays and spray curtains and a thorough cleaning inside and out after each period of use helps ensure that the m a- chine will operate effecti vely at all times. The dish ca rts drain boards, braces, sinks and brushes will also be cleaned thoroughly. The dish tables (and conveyers) will be cleaned using detergent and brushes and rinsed with fresh water. The tables (and conveyers) will be wiped wit h a sanitizing sol u- tion. The shelves, legs, deck drains, decks and bulkheads must be cleaned daily to avoid accumul a- tion of grease, slime and food particles. Before the operator leaves the area, all equipment must be clean and ready for the next operation. Inspection of Dishwashing Machines . The task of determining whether a dishwashing m a- chine is effectively washing and sanitizing utensils is an involved process, particularly without sophi s- ticated laboratory instrumentation; however, it can be satisfactori ly accomplished by the procedures outlined below: Determine that the dishes are visibly clean Establish if personnel operating the machine are adequately trained and are performing their functions correctly including scraping, preflushing, racking, and sorting Determine if the proper dishwashing compound and drying agents are being correctly used and that adequate supplies are available Use a calibrated thermometer (e.g. bimetallic, maximum registering, pyrometer) to determine the temperatures of the wash water and power rinse water (when appropriate) by immersion in the water contained in the respective tank(s). The water should be within the temperature ranges given in Table 5-2. If the machine temperature gauges do not agree with the cali- brated thermometer within + 3 degrees F the gauges must be calibrated or replaced. As a temporary measure, the corrective differential (i.e., the difference between the calibrated thermometer and the machine gauge) should be displayed on or near the temperature gauge in error until the machine gauge is repaired. The final rinse temperature is more difficult to determine since it is based on the temperature of the water at the final rinse manifold. The final rinse temperature can be ascertained by one of the following procedures: Remove the final rinse thermometer or sensing unit from the inlet manifold. Compare the machine thermometer or sensing bulb with a calibrated thermometer by immersing both in a container of hot water (171 degrees F to 195 degrees F). If the machine gauge is in error by more than + 3 degrees F, it must be calibrated or replaced and the corrective differential tem- porarily posted. With this information, the final rinse temperature can be determined by ob- serving the machine gauge while the machine is operating
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-22 Place a calibrated thermometer directly under the final rinse spray to measure the water just as it leaves the spray nozzle. This can be accomplished by attaching a calibrated thermome- ter with rubber bands to an extension device such as a broom handle and placing the ther- mometer directly under the spray nozzle while it is operating. This may not be possible on single tank stationary rack machines unless a pyrometer is used. Caution! Care must be ex- ercised in order to prevent injury! A maximum registering thermometer or a pyrometer are the best instruments to use for this procedure; however, other calibrated thermometers may used. The temperature of the final rinse spray at the spray nozzle, except for single tank sta- tionary rack single temperature and chemical sanitizing machines, must be at least 171 de- grees F. An indirect method of assuring the final rinse temperature is at or above 1 71 degrees F is to pass temperature sensitive tape which indicates 171 degrees F or a maximum registering thermom e- ter through a complete wash and rinse cycle. The temperature sensitive tape (17 1 degrees F) should be attached to a clean dry plate and the maximum registering thermometer can be attached with ru b- ber bands to the outside of an inverted glass. If the tape changes color from silver or white to black or the maximum registering thermometer registers 17 1 degrees F or above and the wash and power rinse temperatures are within the proper range, the correct final rinse temperature can be assumed: Check that all the spray nozzles are properly aligned and unobstructed by debris or lime de- posits and that all the curtains are in place Determine that the flow pressure of the final rinse is 20 (+5) pounds per square inch. This is accomplished by observing the pressure gauge on the final rinse line Assure that the timing of the wash and rinse cycles or the speed of the conveyor is within the manufacturer's specifications which may be found on a permanent type data plate affixed to each machine in a conspicuous location. This information may also be found in Table 5-2 Dishwashing machines which use chemical agents to sanitize the utensils must be evaluated to determine if a sufficient concentration of disinfectant is being applied to the utensil surfac- es. Facilities must have on hand test kits or other devices which accurately determine the concentration of the sanitizing solution being used. The concentration of the sanitizing solu- tion must be tested at frequencies which ensure correct concentrations throughout each ma- chine use period. In addition, determine if there is an adequate supply of the sanitizing chem- ical on hand. Also determine if conditions allow complete air drying Observe whether or not the dishwashing machine and equipment are thoroughly cleaned af- ter each meal period Determine if proper safety precautions are observed during dishwashing operations. Alternative Manual Methods. When cleaning of sinks or warewashing machines is impracti cal, because the equipment is too large or is fixed, cleaning will be done by alt ernate methods as di s- cussed below: Disassemble as necessary to permit access to all parts Scrape or rough clean to remove gross food particle accumulation Clean the equipment using a high pressure detergent spray, a line pressure spray detergent foam or a swabbing/brushing procedure using a detergent solution Rinse the washed equipment with potable water or detergent-sanitizer solution
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-23 Manually swab or pressure spray the equipment with the concentration of detergent-sanitizer or chemical sanitizer specified on the label. SANITATION OF FOODSERVICE SPACES Galleys, the bakeshop, vegetable preparation areas, food stora ge and refrigeration facilities and any other facilities or equipment in which food is prepared, served, or dispensed constitute the to- tal physical plant of the foodservice operations. It is mandatory to keep these spaces in sanitary co n- dition at all times. DECKS, BULKHEAD and OVERHEADS Regular after-meal cleanup is necessary to prevent an accumulation of filth, and frequent in - between cleaning is required if deck cleanliness is to be maintained at a peak standard. When food is spilled, it should be wiped up immediately. No attempt should be made to sweep down decks and dining areas during food preparation and service, as dust rises i n the air and will fall on foods and worktables. Pick up wastes and deposit them in proper receptacles. Vacuum cleaning is the recommended method for dry cleaning bulkheads and overheads. VENTILATION SYSTEM Good air circulation is a basic requirement of proper sanitation because it reduces conden sa- tion of steam and minimizes heat, vapors, smoke, fumes, odors and soiling. Mold and bacterial growth are inhibited whenever there is ample, dry, clean air. Prevent grease from accumulating on hood appliances . Accumulations of grease can drip e i- ther into food being prepared or onto surfaces of equipment where contamination of food is pos sible. Filters should be removed and soaked in a hot (180°F -194°), strong detergent solution. Scrub with a brush. Rinse und er running water or by applying steam from a hose. Removable filters may be run through the dishwashing machine. LIGHTING SYSTEM Sufficient lighting in all areas of food storage, preparation, and service, and in scullery opera - tions, is a fundamental requirement of proper sanitation and safe working conditions. Grease, dirt and vermin a more easily detected and corrected where there is ample light. Routine cleaning of light fixtures and light bulbs contributes to adequate lighting and eliminates the accumulation of dirt and grease film. STORAGE AREAS Fresh and frozen food items are perishable and must receive proper handling in transit and storage to reduce risk to the health and welfare of personnel who prepare and eat foods. During loa d- ing and unload ing on docks, piers, or on board, you should keep areas as clean as possible. Long exposure to weather will hasten spoilage. Daily checks on the sanitation of dry, freeze, and chill spac- es are essential. Mold and decay go hand in hand with poor housekeepin g. Decks, deck grat ings,
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-24 bulkheads and overheads should be cleaned, sanitized and aired as often as possible. Clean ing and defrosting of refrigerated spaces should proceed when stocks are low. Cleaning gear (for example, swabs and brooms) and cleaning s upplies (for example, de ter- gents, disinfectants, and other toxic materials) should be stored in areas specifically designated for their purpose. These items should not be stored in food storage cabinets or on food storage shelves. Dressing Rooms, Lockers and Toilet Facilities Street clothes should never be worn in the galley. Adequate, clean and orderly facilities should be provided for personnel to keep and change clothing to be worn when performing routine duties in foodservice operations. Adequate space should be provided for hanging up these pieces of clothing because they can contaminate food, f ood equipment and food preparation surfaces. Dressing rooms or designated areas for changing and storing clothing must be located outside the areas where food is stored, prepared and served. Dressing rooms and lockers must be clean and orderly at all times. Conveniently located toilet facilities must be accessible to personnel at all times. These areas must be adequately equipped with proper waste receptacles, toilet paper and an approved hand-dry- ing device or sufficient disposable towels. Heads should be located within or immediately adjacent to toilet areas as well as within food preparation areas. These heads must be kept in a clean and orderly appearance. An authorized soap dispensing system and hot and cold running water are also required for use by personnel. Garbage and Trash Disposal The method of collection and disposal of garbage may differ on various ships or stations, but the basic requir ements are the same. Garbage must be disposed of promptly to prevent con tamina- tion of spaces and to eliminate a possible fire hazard. Garbage and refuse must be kept in leak proof, nonabsorbent containers and a sufficient number should be provided to prevent overfilling. Containers will be emptied as necessary during o p- erations and at the close of each workday. After being emptied, each container should be tho roughly cleaned, inside and outside, in a manner that will not cause contamination of food, equi pment, uten- sils, or food preparation areas. Suitable facilities, including hot water and detergent, should be pro vi- ded and used for washing the containers. Ashore galleys and outside refuse and garbage storage areas or enclosures should not be l o- cated within 100 feet of the foodservice facility. They should be placed on or above a smooth surface of nonabsorbent material such as concrete or machine -laid asphalt. These surfaces must be kept clean and in good condition. Food waste disposers or grinders may be used for garbage disposal provided they are d e- signed and/or located in a reamer that prevents contamination of food contact surfaces as a result of a splash and aerosol generation. Potable water should be used as a flushing medium unless othe r- wise indicated by Bureau of Medicine (BUMED). Insect and Rodent Control According to BUMED, the term vector is used t o refer to all insects, rodents and related an i- mals that are significantly related to the transmission of disease to man, act as intermediate host s or reservoirs of disease, present problems of sanitary or hygienic significance, or otherwise affect the health and efficiency of personnel.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-25 Programs for controlling vectors are command responsibilities coordinated through public works programs and medi cal departments. Because the first and most important step in control is to destroy breeding grounds, basic sanitation measures for which foodservice personnel are responsible must be strictly enforced. The foodservice facility and its adjacent grounds mu st be kept clean and free of litter and d e- bris. Openings to the outside should be effectively protected against the entrance of rodents and i n- sects by use of self -closing doors, closed windows, screens, air curtains, or other means. Screens should be tight fitting, free of breaks or tears, and not less than 16 to 1 mesh. However, screens are not required in air-conditioned foodservice spaces where windows or portholes are sealed closed. Space Cleanliness In most foodservice operations, a space inspection is conducted before securing. At most commands the inspection is conducted by the Duty Supply Officer or a senior CS. Areas of conce rn are sanitation, fire, safety and security. Always remember that strict sanitation procedures should be followed in all a reas of foodser- vice operations. Cleanliness can never be overemphasized. FOOD SERVING AREAS —All serving lines should be equipped with a functional sneeze shield. It must present a barrier between the oral zone of patrons within the normal range of stature and the food displayed for service. Proper cleaning and sanitizing procedures for foodservice equipment on the line and around the serving area are equally important in the galley. A number of regulations attendant to serving food must be observed to red uce the possibility of food infect ion. All pans, serving utensils and counters must be kept immaculately clean and sanitized. Self-service bars must be carefully supervised to prevent contamination of food items by p a- trons, thereby preventing the transmissions of pathogenic organisms from one person to another. FOOD PREPARATION AREAS—High standards of sanitation and cleanliness must be mai ntained at all times in these areas . As a CS, you will practice and enforce the “clean as you go” policy for every foodservice person. Cleaning in this way helps maintain high sanitation standards as well as to cut down on the cleanup time after the meal and at end of the workday. Wash your hands and equipment first before starting to prepare food items. Contaminated hand s or equipment leads to contaminated food. Keep worktables sanitized and immaculate ly clean. Do not use steel wool (steel wood is not permitted) for cleaning. Smoking, eating and drinking is not permitted in any foodservice areas. RECEIVING AND FOOD STORAGE AREAS—Before receiving and storing food items, it is very i m- portant that loading docks, piers, or areas where foods are received and stored must be thoroughly cleaned to avoid food contamination. Stores must be inspected for temperatures, identity, quality, and the presence of cockroaches and other insect pests before they are stored. Correct storage proc e- dures play a major role in preventing food-borne illnesses and increasing the storage life of food. High levels of sanitation and safety must be mainta ined in all food storage facilities. Food items should be safely palletized or placed on shelves in an appropriate manner. This proper storage allows proper cleaning and prevents insect and rodent infestation.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-26 DEFENSE AGAINST CHEMICAL, BIOLOGICAL AND RADIOLOGICAL AGENTS The nature of the chemical, biological and radiological contamination problem and the basic procedures to be followed when decontaminating food, galleys, spaces and equipment are discussed in the following paragraphs. DEFENSE AGAINST CHEMICAL AGENTS The United States has committed itself against initiating the use of chemical agents. However, it is necessary to be prepared against attack by an enemy using this type of warfare. A chemical agent is defined as a solid, liquid, or gas th at, through its chemical properties, pro- duces lethal or damaging effects on man, animals, plants, or material, or produces a screening or sig- naling smoke. Chemical warfare agents, like the biological warfare agents, are used mainly because of their effect on personnel, although some agents will have a corrosive effect on specific materials, and i n- cendiary devices will burn most materials. These agents produce a harmful physiological reaction when applied to the body externally, inhaled, or ingested. Most chemical agents cause disorganization of the functioning of the body. The degree of contamination of the messing area and equipment depends on the chemical agent used and the factors involved, such as the method of delivery (vapor, light liquid, and heavy liq- uid), the weather, and the various strengths of contamination. The following paragraphs prescribe the methods to be used in decontaminating eating, drin k- ing, and galley utensils; galley and foodservice equipment; and messing areas that are contaminated by chemical agents. CHEMICAL DECONTAMINATION METHODS Vapor Contamination After the surrounding areas have been decontaminated, the entire general mess should be ae- rated thoroughly and the entire area washed down inside and out with safe water. All equi pment and utensils used in the preparation and service of food should be washed carefully using normal proc e- dures. Spaces, utensils, and equipment should then be tested with the chemical agent detector kit and, if necessary, any of the prescribed procedures should be repeated. Light Liquid Contamination The messing area inside and out should be washed with hot water. You may add an alkaline detergent, such as a standard general -purpose detergent, and if applied at high pressure, it will i n- crease the water‟s effectiveness. As an alternative method, for mustard gas, you may apply a bleach solution to all surfaces. After washing down, aerate the entire area. If slight contamination remains, the area should be heated to as high a temperature as possible for ab out 1 to 2 hours. Then the spaces should be opened and ventilated for 15 minutes. Repeat the procedure as n ecessary, testing at intervals with a chemical agent detector kit. Porous objects, such as meat blocks and wooden benches, may absorb liquid contamin ation to the extent that they will have to be destroyed. Metal, glass, or china utensils or any equipment that is not damaged by water should be immersed for 30 minutes in actively boiling water. Add 1 cupful of alkaline detergent to each 5 gallons of wate r. Upon
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-27 completion of the boiling process, you should follow normal dishwashing procedures. Plastics gene r- ally cannot withstand boiling water and should be destroyed. Heavy Contamination of Liquid Heavy contamination of liquid is unlikely, except from a direct hit, in which case recovery of the space and contents will be a major undertaking. However, when such is the case, the following proce- dures are recommended. Space should be roped off or abandoned as unsalvageable, as no amount of washing or scrubbing of a porous surface that is heavily contaminated by a liquid chemical agent (particularly mustard gas) is likely to do much good. Metal, glass, or china utensils or any equipment that is not damaged by water should be d e- contaminated in the same manner as prescribed for light contamination of liquid discussed earlier. Large equipment unsuited for immersion in boiling water should be scrubbed vigorously with DS2 solution or hot water and an alkaline detergent, rinsed, disassembled and scrubbed again paying particular attention to any parts not reached in the assembled state that are reachable in the dis - assembled state. Then, the equipment should b e rinsed, dried, oiled, greased and reassembled. Wooden items should be removed and destroyed. On electrical equipment, unless the electrical unit is enclosed in a watertight seal, water must not be used in the decontamination process. Electrical equipment should be cleaned with trichloro - ethane or DS2 solution. All greases mu st be removed, bearings cleaned and the equipment re - gressed. Trichloroethane and DS2 are toxic chemicals. Protective clothing and respirators should be worn when they are used, and the MSDSs should be consulted for additional precautions. DEFENSE AGAINST BIOLOGICAL AGENTS The United States has renounced all use of biological agents in warfare, but the need still e x- ists to be prepared to defend ourselves against these agents if other countries should use them. The following section, therefore, discusses the nature of biological agents and the measures you should use to decontaminate the galley, messing areas and food storage spaces in the event of enemy bi o- logical attack. A biological agent is defined as a microorganism that either causes disease in man, plants and animals or causes the deterioration of material. The chief objective of biological agents is mass infection that results in the incapacitation or death of large numbers of individuals or in the destruction of their sources of food, both animal and plant. The biological agents, u nlike most other weapons, act on living matter only and are limited in use to these objectives. In case of a biological attack there are certain instructions that should be carried out for the protection and decontamination of eating, drinking and galley utensils; galley and foodservice equi p- ment; and messing areas contaminated by biological agents.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-28 Good sanitary and hygienic practices are the best defense against many aspects of biological warfare. A close examination of the cleanliness of the mess and s trict adherence to the applicable i n- structions will improve biological defense greatly. The problems of biological agents differ from ordinary military hygiene problems only in that hardier types of organisms may be present in other than their normal environment and in higher levels of contamination. In treating the problem of biological attack, it is assumed that there could be contamination of personnel, of all exposed surfaces, and of circulating air. Because of the current difficulties in rapidly detecting biological agents, knowledge of contamination might (although not necessarily) be based on the occurrence of widespread or unusual sickness. This sickness could be caused by contamination that had occurred several days or weeks before. A situation could exist also whereby extensive use of biological agents would require additional precautions in the operation of all messes. These instru c- tions are intended for use in the event of suspected or known biological attack. The problem is to d e- contaminate and prevent recontamination. Biological Decontamination Methods Use calcium hypochlorite (bleach) solutions for biological decontamination. Scrub the interior surfaces of contaminated spaces with 200 -ppm chlorine solution to remove dust and grease. Then, hose spaces with fresh, safe water and repeat the process. You may also use iodine solutions pr e- pared by the medical department. Large equipment (those items too large to be immersed in sinks or run through dishwashing machines) should be washed, rinsed and decontaminated in the same manner as prescribed for int e- rior surfaces of messes. Small items of equipment that will not suffer damage by immersion should be washed, rinsed and sanitized in the dishwashing machine or by hand dishwashing as described earl i- er in this chapter. Before eating and drinking utensils are brought to the scullery for decontamination, the interior bulkheads, all working surfaces (tables, dish carts, and sinks), the interior and exterior of the di s- hwashing machine, and all other equipment used in the washing and sanitizing of eating and drinking utensils should be thoroughly washed, rinsed and decontaminated as appropriate. Eating and drinking utensils should be decontaminated by machine or hand washing. A person who has handled conta minated utensils should not handle decontaminated utensils until the person has been decontaminated. Decontaminated articles should not be placed in contact with any surface that has been exposed to contamination. If possible, use baskets or containers des igned to hold si l- verware in a vertical position, handles down, during the washing and sanitizing proc esses and addi- tional containers of similar construction into which the silverware may be inverted without being ha n- dled by workers. If such containers are not available, lay the silverware flat in the racks, not exceeding two utensils, with the handles extending in the same direction. Do not exceed a depth of two ute nsils. Take care when removing utensils from the racks after decontamination to prevent recontamination. Sterilization by hypochlorite solution should be used only when dishwashing machines do not operate correctly. While they are still in the wash rack, soak t he utensils for 1 full minute at 100°F to 140°F in a solution of 1 part hypochlorite and 50 parts water in a single -tank machine, or 1 part h y- pochlorite and 500 parts water in a double-tank machine. One-fifth of 1 percent of a detergent must be added to either solution.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-29 This solution may be mixed from nonionic detergent and any one of sever al chlorine contain- ing compounds such as calcium hypochlorite, or laundry bleach. In storage, compounds containing chlorine have been known to deteriorate. It will be nece s- sary, therefore, to have a qualified person from the ship‟s company analyze the soa king solution for chlorine content to make sure the proper concentration of available chlorine is attained and continued at sufficient strength. After the sterilization, soak and water rinse, cover the wash racks containing the utensils with a cloth that has been sterilized by boiling. Do not transfer utensils to another rack. Make sure perso n- nel in the serving line pick up utensils from the wash racks by touching only the handles. Large equipment may be decontaminated by the use of hypochlorite. Hypochlorite is corrosive to all metals that will rust and should not come in contact with motors and other electrical equipment from which hypochlorite cannot be thoroughly wiped off. After decontamination, cover as much of the equipment as possible with clean cloths to prevent recontamination. Avoidance of Recontamination Recontamination may be caused by secondary aerosols that resettle organisms on surfaces or contaminate the air that is breathed. Secondary aerosols are clouds formed from particles (bacteria or other organisms) that, having been deposited on a surface, are stirred up into the air again by scuffing, shaking, or other mechanical action. Secondary aerosols may be suppressed by wetting sur- faces with oil or water. If oil is used as a suppressant, it must not generate harmful vapors and it must not be applied to walking surfaces that may create slippery conditions. It is important to make sure, before entering the messing area, CS personnel and all personnel eating in the messing areas are as free as possible from contamination. The medical officer should be consulted on the decontamination of foodservice personnel. In cold weather, personnel in the serving line should be required to remove outer garments and leave them outside the messing area before entering the mess. It has been found that removing clothing will shake off organisms that have come in contact with the surfaces, thereby setting up secondary aerosols. Do not permit unauthorized pe r- sonnel in foodservice spaces. Hypochlorite is a strong oxidizer and, in powdered form, reacts violently with oils and greases. Use hypochlorite in a well -ventilated area. Always wear goggles and protective gloves, and consult the Material Safety Data Sheet (MSDS) for additional precautions. Decontaminating Food Items The advice of the medical officer must be sought before any attempt is made to decontam i- nate food suspected of biological contamination. Semi-perishable Food Items Food packed in containers that are resistant to the passage of biological agents (sealed con- tainers made of metal, plastic, glass, or porcelain) requires only proper exterior decontamination be performed. Paper labels and paper covers must be removed from the container and one of the follow- ing methods of decontamination should be used: Immerse the containers for 15 minutes in a solution of water to which 200-ppm available chlorine has been added and then rinse them with potable water
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-30 Soak the containers for a minimum of 15 minutes in effective detergent solution as a quick method to reduce contamination to a safe level. (See formula 1 discussed under the heading Radiological Decontamination.) Then rinse them with potable water The exterior surfaces of stacks of food packed in impermeable packages can be sterilized us- ing any of the standard chemical methods such as bleach solution, sodium carbonate, or DS2 followed by rinsing in potable water Food packages that will not stand immersion must be wiped off with a solution of water to which 200-ppm available chlorine has been added and the food thoroughly cooked before it is eaten. Fresh or Chill Items Food that can be peeled or pared may be decontaminated by soaking for 15 minutes in water to which 200-ppm available chlorine has been added before it is peeled. The food must then be th o- roughly rinsed in potable water. It can then be peeled or pared and should be rinsed again with pot a- ble water. This method has been applied satisfactorily to apples, potatoes and eggs. For other fresh or chill items, the use of heat is the most practical me ans of decontaminating foods. Thorough cooking will reduce contamination to a safe level so that food can be consumed. Frozen Items Food items stored in the freeze space in impermeable containers (e.g., tamed frozen strawber- ries) may be decontaminated by immersing the containers for 15 minutes in a solution of water to which 200-ppm available chlorine has been added; the containers are then rinsed with potable water. Food items stored in the freeze space in permeable contai ners (e.g., frozen vegetables ) may be decontaminated as outlined earlier for food packaged in sacks or other permeable containers. Food items stored in the freeze space, but not contained in outer packaging ( e.g., meat), must be completely thawed and thoroughly cooked before they are eaten. Additional Precautions Hands should be free of contamination during the opening operations to make sure the co n- tents are not contaminated. Opened cans of fruit jam, jelly, or similar foods must be destroyed. Opened cans of vegetables may be deconta minated by boiling the vegetables for a minimum of 15 minutes in a steam-jacketed kettle. Biological Decontamination in Food Preparation The use of heat is the most practical means of decontaminating biologically contaminated foods. In no case should dec ontaminated food be consumed until it is pronounced safe by a medical officer. It is recommended that, insofar as possible, only foods contained in impermeable packages (cans, bottles, jars) be decontaminated and used for meal preparation. Food items that are not packaged or that are packaged in permeable containers may be cooked by either cooking in a pressure -type cooker at 15 pounds of pressure at 250°F (or 121°C) for 15 minutes or boiling for a minimum of 15 minutes.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-31 Certain contaminated items may be decontaminated by baking. Only those recipes listed in the Armed Forces Recipe Service (AFRS) that specify an oven temperature of 400°F and above, for a cooking period of 30 minutes or longer, should be used to prepare baked items from contaminated i n- gredients. All meats except those contained in decontaminated impermeable containers (canned meat items) must be cooked to the well-done stage. Guidance cards in the AFRS include information on in- ternal temperatures indicating the well-done state. Biological Decontamination of Water The detection of water contamination and requisite laboratory analysis are responsibilities of the medical department. Biological decontamination of water is not difficult when regular water trea t- ment facilities exist. However, mo re chlorine probably will need to be added during the ordinary processing of the water. If no water treatment facilities are available, water can be decontaminated by either of the following methods: By boiling for 20 minutes By using iodine tablets coupled with boiling. A medical officer should approve the method of decontaminating . After the decontamination process, the officer should determine whether or not the water is fit to be used. Water that has been decontaminated must be protected against further contamination. DEFENSE AGAINST RADIOLOGICAL AGENTS Radiological defense includes all such measures to minimize personnel and material damage from radioactivity. The basic responsibility for this function resides with the damage control or ganiza- tion of the ship or station. Your basic guidance in radiological defense matters will come from them. Supply Department personnel are normally assigned appropriate duties according to the damage con- trol plan. You should be aware of the plans and procedures t o be followed on board your ship or sta - tion. Emergency operations are those that immediately follow the blast. During this period, a reali s- tic evaluation of the disaster is made and initial steps toward recovery are taken. Protective clothing monitoring equipment and decontamination gear will also be needed. Blast damage and thermal radiation may result in partial or complete destruction of messing facilities and food items. Radioactivity is important because of the effect it has on the human body. Because of its ability to penetrate matter deeply, gamma radiation is usually considered to be the most hazardous. Since the principal source of alpha particles would be the envisioned nuclear ma- terial of the weapon, the probability of significant alpha c ontamination from nuclear detonation is small. Beta particles have poor penetrating ability. Ordinary clothing will stop beta particles. They e n- ter the skin only to a depth of about one -fifth of an inch, but their ionizing power is about 100 times that of gamma rays. When ingested with food, inhaled, or admitted into the body through cuts or open wounds, beta particles meet no barriers and become particularly destructive if they are retained in the body for some time. Therefore, in food preparation and service, all forms of radioactivity should be re- garded as hazardous. Radioactivity may be introduced into exposed materials that are close to the burst. Such items as soap, table salt, copper, or brass may become radioactive as a result of radiation (the actio n of
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-32 neutrons). Radioactivity may also be carried by blast residues, the principal one being dust particles. A person contaminated by radioactive materials can easily contaminate an otherwise safe object or area. If the person handles foods, the foods can become contaminated. Radioactivity cannot be d e- stroyed by cooking or sterilization; neither can it be neutralized by chemical treatment. It must be r e- moved as completely as possible to a limit of radioactivity set by the command authority in the light of existing circumstances. There are various methods of removing contamination. They differ in effectiveness in removing the contaminant, in applicability to given surfaces, and in the rate of operation. These, in general, fall into two classes, gross or rough decontamination and detailed decontamination. Gross decontamina- tion consists of a rapid washing down with large quantities of uncontaminated water from a fire hose or nozzle system. This class is generally not suitable for use in galley and messing areas except for decks. Detailed decontamination procedures are more thorough. These procedures us e more time, manpower and material, but they are also more effective. Detailed decontamination will be necessary in galley and messing areas. Efforts to decontamina te with heavily contaminated water will o bviously be ineffective. However, water contaminated to a lesser degree than the surface contamination to be removed may still be used. Water used for decontamination must be allowed to drain freely from co n- taminated areas. Water from tightly covered storage tanks should be safe and potable, provided the circulating system is tight. Water from open reservoirs cannot be relied upon to be free from contam i- nation. Seawater in the neighborhood of an aerial burst to windw ard will be contaminated at the su r- face. A subsurface burst will heavily contaminate seawater in the vicinity. General knowledge of the local situation and a monitor survey should provide data on which a decision regarding the water supply will be based. When materials (cleaning agents) specifically designed to remove radioactive contaminants are available, those materials should be used according to instructions and the Material Safety Data Sheet (MSDS). When they are not available, the following solution s are suggested for the general cleaning of galley surfaces: Formula 1 Detergent general-purpose, liquid, water-soluble, type I, 1/2 pound. Military specification MIL - D-16791. Sodium phosphate, tribasic, technical (trisodium phosphate), 1/2 pound. Feder al specification O-S-642, type II. Water, hot, 12 gallons, 100 pounds. Directions: The sodium phosphate should be completely dissolved by stirring it into hot water. The liquid detergent should be added and stirred until it is thoroughly dispersed. Formula 2 Dishwashing compound, machine, granular, free flowing. Federal specification P-D-425a (spe- cify whether hard or soft water will be used). Directions: The compound should be dissolved in hot water to make a 0.5 percent (appro x- imate) solution (1 pound per 25 gallons of water). The solution should be hot when it is used.
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-33 Formula 3 Citric acid, monohydrate, granular form. Military specification MIL -A-11029 (Cml), Change No. 3223. Directions: Citric acid should be dissolved by stirring to make a 3 per cent (approximate) solu- tion (3 pounds per 12 gallons of water). In use, utensils should be immersed and metal surfaces should be sprayed. Except for citric acid, the previous materials are commonly used and are readily available. The suggested formulas are not intended to take the place of agents specified in existing decontamination instructions. They constitute the bare minimum as substitutes and should serve to meet immediate emergency requirements. All chemical cleaning agents function most efficiently when hot. The choice of method and cleaning agent to be used should depend upon the nature of the surface to be deco n- taminated, the kind and degree of contamination, and the time, ma npower, and materials available to do the work. All these cleaning agents are hazardous materials. Always wear goggles and protective gloves when mixing these solutions, and consult the MSDS for specific precautions. Decontaminating Foods All food should be carefully monitored. Foods in metal or glass packages may be safe. C on- tamination is best removed from the external surfaces by washing. Food items in sealed, dustproof packages may also be safe, provided the wrapper is not broken. To remove the contamination from these packages, vacuum them and carefully remove the out er wrap. Some vegetables can also be decontaminated if they are carefully washed, dried, monitored, and peeled -if monitoring shows co n- tamination is not above specified limits. When surface contamination cannot be physically removed, the food should be condemned. All foods must be inspected and approved by the medical officer. Decontaminating Spaces and Equipment Thorough cleaning of all surfaces is vital. Work should commence overhead and continue downward in the direction of the liquid flow. When feasible, the first step should consist of flushing the surfaces with safe water. Do not get water on electrical controls that are not waterproofed. The second step involves systematic scrubbing with chemical cleaning agents. Piping, ductwork, stan- chions, bulkheads, coamings and decks should be repeatedly scrubbed until monitoring indicates that a safe condition exists. Bare metal surfaces should be given an initial scrubbing with alkaline dete r- gents to remove grease film. When available, citric acid solution shou ld then be applied and allowed to remain for a minimum period of 10 minutes. Rinse the surface with safe, fresh water, allow to dry and monitor. In the absence of citric acid, vinegar may be used, but it is less effective. Decontaminating Utensils and Dinnerware Treat metal utensils and dinnerware such as metal tableware and cutlery in the same manner as other metal surfaces. Wash with a detergent followed by an acid treatment. When possible, i m- merse utensils and dinnerware in the acid solution. Crockery and glass present no particular cleaning problem, provided the glazed surfaces are without scratches or foreign deposits such as stains or hard water scale. Plastic ware may present some difficulty b ecause of the relatively porous character of the surface, scratches, and the presence of foreign deposits. Both glassware and plastic ware should be machine washed, rinsed, dried and each item monitored. Those that do not pass should be inspected for cracks and surface defects. Cracked and badly scratched items should be disposed of
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CS: “Sanitation”, Chapter 5. Rev. DEC 2010 5-34 immediately. The other items still showing contamination should be given repeated washings until safe, or they should be segregated to await natural decay of contamination or disposal of the item. Protection of Personnel When you ar e engaged in decontamination, wear protective clothing as prescribed by the ship‟s damage control bill. If protective clothing is not available, similar garments may be substituted. Care must be taken to make sure substitute clothing adequately prevents ra dioactive particles from coming in contact with the skin or gaining entry to the body by ingestion, inhalation, or through breaks in the skin. Masks should be worn. In the absence of regulation masks, chemical goggles should be worn to protect the eyes. A High Efficiency Particulate Air (HEPA) filter respirator also can be used to protect the lungs. Spaces that were not contaminated, or that have been decontaminated, must be carefully pro- tected. All personnel and material must be carefully monitored (decon taminated if needed) before an- yone is permitted to enter these spaces. Cleaning gear, items of protective clothing, and so forth, used in decontamination procedures should be segregated and disposed of as contaminated accor d- ing to their level of contamination. To familiarize yourself with protective clothing and equipment, and with the procedure for adapting regular issue clothing for NBC warfare protection, see Military Requirements for Petty Officer Third Class, NAVEDTRA 12044. Preventing Recontamination Contaminated items brought accidentally into spaces should be removed and, pending decon- tamination of the affected areas, these areas should be roped off. Personnel who may have walked through these areas or who may have otherwise come in contact with r adioactive particles should be sent to the decontamination station. SUMMARY In this chapter, we identified the d ifferent food-borne illnesses, different types of poiso n- ings, principles of personal hygiene, principles of food service equipment, manual and machine dis- hwashing principles, spaces, food products, and the defense of chemical, biological, and radiological agents. In a foodservice operation, nothing rivals the importance of sanitary food preparation and se r- vice. Carelessly handled food is easily contaminated with pathogenic organisms that may lead to il l- ness. This chapter discussed the methods of preventing illnesses arising from poor sanitary practices in the preparation and service of food.