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r w 55TATE OF CALIFORNIA --HEALTH AND WELFARE AGENCY GEORGE DEUKMFJIAN, Gomm, DEPARTMENT OF HEALTH SERVICES 5445 E. SHIELDS AVENUE FRESNO, CA 95727 (209) 415-5321 40� �Y December 5, 1984N J q 141984 EQ4TypD TR00,gL, Mr. L. A. Moldenhauer Moldenhauer Engineering Company 1111 Kennedy Place, Suite 1 Davis, CA 95616 L Dear Mr. Moldenhauer: Santos Ranch Rural Subdivision Tracy Area — San Joaquin County We have received your report entitled, "Santos Ranch Area — Ground Water Study, 20 August 1984", and have reviewed its content. We share your concerns that the local ground water used for domestic water supply purposes appears to exceed both Primary and Secondary Drinking Water Standards and may at times be exposed to biological contaminants of sewage origin, especially during wet weather — high ground water conditions. Until this problem is more adequately documented, it would appear prudent for the consumers of such waters to initiate appropriate public health safeguards. 1. Where the water exceeds 45 ppm of nitrate, bottled water should be used for ingestion purposes for all infants less thin 6 months of age.. Bottled water should also pe used by pregnant women for precautionary purposes. 2. Where the water is high in TDS, sodium and chloride or where the water is Softened, bottled water (low in sodium) should be used by persofts on doctor recommended low sodium diets. 3. If sewage contamination hazards are felt to exist, one would normally prescribe chlorination treatment or the boiling of water for 5-10 minutes as interim public health safeguards. Such chlorination treatment appears technically feasible for community water systems, such as the school and for the Currier Estates community water system. Chlorination of individual wells is not technically feasible. Boiling the water does not seem the thing to do as such boiling would only further increase the nitrate and salt contents of the water both of which are already elevated. Therefore, private well owners could mitigate any perceived biological hazard to their wells by using bottled water for all ingestion purposes.