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i At SAN JOAQUIN LOCAL HEALTH DISTRICT -ENV IRONMENTAL.HEALTN-DLVISIOAL�,- 1601 E. HAZELTON- AVE'. , " P.O. BOX 2409, STOCKTON, CA 95241 September 25, 1987 San Joaquin County Board of Supervisors 222 E. Weber Ave., Room 741 Stockton, CA 95202 RE: Zone Reclassification No. ZR 87-34 Traina Brothers The San Joaquin Local Health District recommends that all conditions specified in items 3. a,b and c, (see attached), be retained as part of any approval for this Zone Reclassification and subsequent major subdivision. The Health District's position is as follows: 1. A public water system is inspected, sampled and monitored on a routine basis. This service assures the users that water quality standards related to bacteria, chemical, pressure and volume are in compliance with the requirements of Title 22 CA Administrative Code. 2. Documented water quality tests on wells within the proposed development area indicate marginal water quality for Nitrates, Total Dissolved Solids (TDS) and Specific Conductance (S.C.). These small public water systems are being monitored and subject to the installation of water treatment equipment if future tests indicate that they exceed State Maximum Contaminant Levels (MCL). 3. California Regional water Quality Control Board personnel are working on a Trichloroethene (TCE) contamination problem in the groundwater on and around the Tracy Defence Depot. The Depot is located within a 0.5 mile radius of the proposed development. Regional Water Quality Control Board personnel are also working on a Chloroform contamination problem approximately 0.5 mile south of the proposed development. A public water system is the only entity required to be routinely monitored for the potential migration of these chemicals off site and into the surrounding water wells. Indvidual residential water wells would not be subject to this routine monitoring.