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'QUI SAN JOAQUIN <br />COUNTY--- <br />Greatness grows here. <br />September 17, 2021 <br />TRACY LABARBER <br />20157 LITTLE JOHN ROAD <br />STOCKTON, CA 95215 <br />Location: 20157 Little John Road <br />Sampling Date: 08/23/2021 <br />Subject: DBCP found in well water results <br />Environmental Health Department <br />Jasjit Kang, REHS, Director <br />Muniappa Naidu, REHS, Assistant Director <br />PROGRAM COORDINATORS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Willy Ng, REHS <br />Melissa Nissim, REHS <br />Steven Shih, REHS <br />As part of the Soil Suitability/Nitrate Loading Study the Environmental Health Department (EHD) requires <br />sampling of the domestic water well serving the homes. The water sample was taken August 23, 2021 <br />by AdvancedGeo and analyzed at a state certified laboratory. <br />EHD has received the sample results and found the well water has failed to meet established drinking <br />water criteria for the following constituents: <br />Contaminant <br />Result <br />MCL <br />DBCP <br />0.27 <br />0.2 /L <br />DBCP is an agricultural pesticide that targets nematodes. This chemical was discontinued in 1977 but <br />is still found in wells in the central valley to this day. The State Department of Health Services adopted <br />a maximum contamination limit (MCL) of 0.2 parts per billion (ppb) for DBCP in public drinking water <br />systems in 1989, however private well owners are not legally required to meet this standard. As a <br />precaution for yourself and family EHD recommends the following methods to mitigate exposure to <br />DBCP: <br />1) As a temporary measure it is recommended that bottled drinking water be used if this well is <br />supplying drinking water. <br />2) Water treatment methods such as a granular activated carbon filtration or "air stripping" are viable <br />methods to remove DBCP from the water supply. Please keep in mind that the best practice for <br />treating your well water is at the source or before the water enters the home plumbing. Point -of -use <br />filtration systems like faucet or fridge filters do not prevent exposure to chemicals through contact <br />such as bathing and inhalation. <br />3) A replacement well with a 200 foot grout seal is also an alternative for providing uncontaminated <br />water. A test well may be drilled in order to determine water quality prior to final placement of the <br />well. Water quality may be determined and monitored through water sample analysis performed by <br />a State Certified Laboratory. (See attached list of State Certified Laboratories). <br />For more information and possible health effects, please refer to the attachments and If you have any <br />questions regarding your well water test results you may contact Aaron Gooderham, Registered <br />Environmental Health Specialist at (209) 616-3062. <br />Steven Shih, REHS <br />Program Coordinator <br />1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjcehd.com <br />