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PUBLIC fiEALTH SERNICES Pp U[N <br /> SAN JOAQUIN COUNTY r. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 952 8 <br /> 209/468-3420 <br /> Lcl-'. C <br /> BOB BOUST JAN 3 0 1997 <br /> UNOCAL <br /> 2000 CROW CANYON PL STE 400 <br /> SAN RAMON CA 94583 <br /> RE: 437 East Miner Ave SITE CODE: 1181 <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Quarterly Data Report" dated December 9, 1996 and prepared by MPDS. <br /> PHS/EHD has the following comments for your consideration and response. <br /> The report included the results of groundwater samples collected on November 5, 1996. Significant <br /> groundwater contamination continues to be evidenced in the onsite well, U3, located downgradient <br /> of the former underground storage tank site, of 2,400 ppb benzene and 43,000 ppb TPH-gasoline. <br /> It should be noted that there is not an offsite well that is located downgradient (north) of monitoring <br /> well, U3. <br /> In review of the site's status, PHS/EHD has determined that the site is not in compliance with <br /> regulatory directives issued regarding this site. PHS/EHD, in correspondence dated July 11, 1996, <br /> requested that all groundwater samples undergo MTBE analysis with numerical results reported. <br /> The "Soil Remediation Feasibility Study Work Plan" dated April 30, 1996 which proposed to use the <br /> existing vapor extraction well, UVt, which was screened from 15 to 40 feet below ground surface, <br /> was approved. PHS/EHD requested in correspondence dated July 11, 1996 that Unocal proceed <br /> with permitting with the San Joaquin Valley Air Pollution Control District and the City of Stockton, <br /> since vapor extraction tests do not normally occur over a six month period. In order to demonstrate <br /> Unocal's commitment to comply with regulatory directives, evidence must be submitted by February <br /> 14, 1997 that permitting issues have been resolved, the feasibility study must be initiated by March <br /> 7, 1997, and the corrective action plan must be submitted by June 13, 1997. Failure to comply <br /> with these directives could jeopardize Unocal's ability to access the State Water Resources Control <br /> Board Cleanup Fund Program. <br /> If you have any questions please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS ✓Marga t Lagono, R <br /> Site Mitigation Unit Supervisor <br /> MM/437MINER <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Stephen Carter, GeoStrategies 3164 Gold Camp Ste. 240, Sacramento CA 95670 <br /> cc: Joel Greger, MPDS 2401 Stanwell Ste. 300, Concord CA 94520 <br /> cc: Sutter Office Center, 2001 Union Street Ste.300, San Francisco CA 94123 <br /> A Division of San loaquin County Health Care Semces <br />