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PUBLIC = EALTH SER ICE <br /> a I S <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION ::. <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting He alth Officer <br /> 304 E. Weber Ave., Third Floor * P O. Box 388 • Stockton, CA(Co <br /> MAILED NOV 2 91995 <br /> KENNETH R EARNEST <br /> QUENTIN KIRSH <br /> ULTRAMAR INC <br /> 190 EAST AMBER WAY <br /> P 0 BOX 466 <br /> HANFORD CA 93230 <br /> HANFORD CA 93232-0466 <br /> RE: Former Beacon Cardlock #610 <br /> SITE CODE: 1765 <br /> 3300 Waterloo Road <br /> Stockton, CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the "Third Quarter 1965 Ground Water <br /> P <br /> Monitoring Report" dated October 17, 1995 which was prepared by El Dorado <br /> Environmental. PHS/EHD has prepared the following!comments for your <br /> consideration. <br /> The report included the results of the groundwater sampling conducted on August 7, <br /> 1995 and August 25, 1995 which evidenced groundwater contamination. PHS/EHD <br /> requested the groundwater sampling in order to verify that the rise in groundwater <br /> elevation did not facilitate the migration of residual soil contamination into the <br /> a I <br /> groundwater. Since groundwater has been contaminated, PHS/EHD requires <br /> additional quarterly sampling events to evaluate the extent 'of contamination. <br /> PHS/EHD does not concur with your proposal to discontinuequarterly monitoring. <br /> As per PHS/EHD correspondence dated July 14, 1995 which summarized the <br /> meeting held on July 7, 1995, should data suggest that groundwater may be <br /> adversely impacted, a feasibility study must be conducted. IThe feasibility study must <br /> evaluate at least two remedial alternatives. The mosf;cost effective alternative for <br /> restoring or protecting the beneficial use will be selected in the corrective action plan. <br /> The depth to groundwater from the most recent monitoring events, August 1995, <br /> indicate that groundwater is at approximately 59 feet 6elow!�surface, reflecting an <br /> increase of approximately 10 feet since the previous monitoring ring event of January 13, <br /> 1995. However, since MW1 - MW4 were installed, groundwater has decreased <br /> approximately 21 feet as compared to the current level. <br /> L <br /> The changes in the depth to groundwater pose a particular problem with fixed <br /> monitoring wells. A brief evaluation of the construction of the monitoring wells <br /> indicated that monitoring wells, MW1 - MW4 were screenedilfrom approximately 33 to <br /> 63 feet below grade and MW5 - MW7 were screened from 70 to 90 feet below grade. <br /> A Division of San Joaquin County Health Care Services <br />