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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY =' <br /> c s� <br /> b: < <br /> JOGI KHANNA M.D.M.P.H. <br /> Health Officer <br /> P.O. Boa 2009 • (1601 East Hazelton Avenue) •Stockton,Caiifomia 95201 ipi641 <br /> (209)4683400 <br /> RICHARD CALLISTRO <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS <br /> 222 EAST WEBER AVE ROOM 678 FEB 17 1993 <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Human Services SITE CODE 1257 <br /> 145 South Sutter Street <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Proposal for Quarterly Groundwater Monitoring" dated January 21, 1993 and prepared by <br /> Weston. PHS/EHD has the following comments for your consideration. <br /> Evaluation of the most recent groundwater monitoring results available, August 2, 1991, indicate that total <br /> petroleum hydrocarbon (TPH) gasoline and diesel, benzene, toluene, ethylbenzene,xylene, EDB, and total <br /> lead have been detected. Please add analysis for TPH-diesel, EDB, and total lead to the constituents listed <br /> in the proposal. Analysis for these additional constituents should continue for a minimum of two quarters. <br /> Since there exists the possibility that tidal influences may affect local site gradient, PHS/EHD recommends <br /> that groundwater depth measurements be collected both prior to sampling wells and after the wells have <br /> been sampled. The depth to water measurements should be collected within a one hour time period prior <br /> to sampling and again after sampling of the monitoring wells. <br /> Please contact Mary Meays, REHS, of my staff at (209) 468-0337 if you have any questions or to schedule <br /> the next quarterly sampling event. <br /> Jogi Khanna, Ivt7D., M.P.H. <br /> Health Off c' <br /> i <br /> urie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Michael Smith, Health Care Services <br /> c: Mel Wingert, San Joaquin County Administrator <br /> c: Robert Sengebush, Weston <br /> .A Dhiwon of son Joaqum Ca ty Health Cue Senico <br />