REHS/RS NEHA Study Guide 2022 with complete solution

REHS/RS NEHA Study Guide 2022 with complete solution When gas pipe is leaking, what methods would be used by the technician to identify the exact point of leakage? Using soap bubble solution Which organization requires cover for baking dough BISSC (Baking Industry Sanitation Standards Committee) The Registered Sanitarians are first and foremost: Educators Common microorganism associated with skin rash in whirlpools? Pseudomonas aeruginosa Complaining of extreme eye irritation by swimmers in a swimming pool may be: Improper pH value Workers in dental care may receive: Mercury Vapor poisoning Most accidents that occur in the home to infants aged 1-4 is caused by: Walking/falling Most accidents around swimming pools: Drowning Which can adversely effect the nerve cell? Neurotoxin High rate of infection: Campylobacter jejuni -- usually found with Salmonella, caused by contaminated chicken source. Most enteric disease: (Enteric-related to the digestive system) Norwalk virus The LEAST amount of backfill over the absorption field should be: 12 inches (12-18'') Best method to avoid UST (Underground Storage Tank)problems: Prevention from corrosion Filters will: Reduce stray radiation Swimmers ear is caused by: Pseudomonas A principle for effective radiation protection: distance, time, shielding Radiation could scatter and bounce off the wall, floor, ceiling Know characteristics of alpha particles Are they made of protons & neutrons? Yes Is absorbed the most matter? No Do they have a high penetration rate? No Minimum temperature for laundry in nursing home & health care facilities 160°F Which test is initially used if water is suspected of contamination with fecal matter? FECAL coliform. Which one is the correct sequence? Coagulation-flocculation-sedimentation-filtration The minimum retention time recommended for a septic tank is: 24 hours Which filter is BEST to use for small communities in developing areas and in rural locations? Slow sand filter Which filter is BEST for removal of Giardia cysts from low turbidity water Slow sand filter (DE is best for swimming pools and industrial water supplies, not drinking water) Microbial pollution travels only a short distance through: Smooth clay Backsiphonage may be prevented by all of the following methods except: Hydrostatic loops Which of the following is NOT REQUIRED at a water treatment plant? A Pre-incident Plan ("A water treatment plant should have a well-equipped laboratory, certified operator, and qualified chemist" -pg 232 of old Salvato book) Giardia is classified as a protozoa Which one is most commonly transmitted by food or water? Hepatitis A Entamoeba Histolytica is a Protozoa Which is the preferred field test for a water system (for residual chlorine)? DPD Which is the measurement of the amount of light scattered by particles suspended in water test sample? Nephelometric Turbidity Units (NTU) Giardia is classified as a: Protozoa Which is transmitted by food or water? Hepatitis A Entamoeba Histolytica is classified as a? Protozoa What is another name for swimmer's itch? Schistosoma spp High concentrations of Nitrates in drinking water are: A possible cause of methemoglobinemia (Blue Baby Syndrome) Well head protection? casing, cap and surface seal If a water sample is chlorinated: Use a bottle with Sodium Thiosulfate (acts as a dechlor) Water sampling technique when transporting to the lab? sterile glass or plastic bottle is the most important (also using the right preservative is important) Which steps are correct in stream cleaning? Stream pollution (organic) is apparent along its length by a Zone of Degradation (just below the source), the Zone of Active Decomposition, and the a Zone of Recovery or Self-Purification. O2 decreased in Zone of Degredation suspended solids increased and sludge on the stream bottom. Emergency water treatment? Boil for 1 minute. (100 degrees Celsius is 212 degrees Fahrenheit). Also can add suggested amount of chlorine per gallon of water and let sit for 30 minutes. Can also use 8 drops of iodine tincture per quart of water. Can also use 1 tsp of bleach per gallon of water The composition of soil under an OSS drainfield is very important in the removal of both viruses and bacteria. Which of the following soil conditions is most favorable for removal of viruses? Fine loamy sand over course sand or gravel NTU are most commonly used to? Determine turbidity What causes water hardness? Minerals (Dissolved calcium and magnesium bicarbonates, sulfates, and chlorides) Water containing Nitrates generally indicates? Evidence of agricultural pollution (Note: Ammonia in the water comes from decomposition of organic matter and is evidence of fresh water pollution.) Microbial pollution only travels a short distance through: Sandy loam or clay (most dense soil type) which of these techniques is used to properly seal a drilled well to prevent contamination of the water supply? Grouting One of the most common reasons for the contamination of the water supply coming from a drilled well through rock, clay or hardpan is; Failure to seal the well casing properly, improper grouting The flushometer valve is typically protected by? A non-pressure type vacuum breaker A physical cross connection? Is a connection which may permit/allow the flow from an unapproved (non-potable, ie. sewer) water supply into a potable (approved) water supply. Which type of filter is best to use to strain/remove amoebic cysts? Diatomaceous Earth Filter, Slow Sand and/or Cartridge What makes water have a color? Dissolved Solids The importance of surveys for new well water? Infiltration from ground water (also the importance of a sanitary survey for a water system is in order to determine the safety and adequacy of the water supply). The importance of lime...to treat high concentrations of... contaminants (Lime is spread on surface