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PUBLIC UEALTHSE�R'�JCES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> :< } <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 . Weber Ave., Third Floor • P. O. Box 388 Stockton, CA 95201-0388 • cq�;Fo � P <br /> 209/468-3420 MAILED NOV 2 9199 <br /> f� <br /> KENNETH R EARNEST <br /> ULTRAMAR INC h QUENTIN K1RSH <br /> P O BOX 466 190 EAST AMBER WAY <br /> HANFORD CA 93230 <br /> HANFORD CA 93232-0466 't <br /> 6 <br /> RE: Former Beacon Cardlock #610 SITE CODE: 1765 <br /> 3300 Waterloo Road <br /> --:Stockton; CAx:95205- <br /> San Joaquin County Public Health Services, Environmental.i Health Division <br /> (PHS/EHD) has completed review of the "Third Quarter 1995 Ground Water <br /> MonitoringReport" dated p ed October 17, 1995 which wasre aced <br /> p �� by EI Dorado <br /> Environmental. PHS/EHD has prepared the followingfComments 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 /> I 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 /> 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 discontinue quarterly monitoring. <br /> 4� <br /> As per PHS/EHD correspondence dated July 14, 1995 which summarized the <br /> meeting held on July 7, 1995, should data suggest that gro P ndwater may be <br /> adversely impacted, a feasibility study must be conducted. :The feasibility study must <br /> evaluate at least two remedial alternatives: The most cost effective alternative for <br /> � �-restoring-orprotecting the beneficial"use wilfrbe'selected in the corrective action plan. <br /> ,9 <br /> I <br /> The depth to groundwater from the most recent monitoring events, August 1995, <br /> indicate that groundwater is at approximately 59 feet below surface, reflecting an <br /> increase of approximately 10 feet since the previous monitoring event of January 13, <br /> 1995. However, since MW1 - MW4 were installed, groundwater has decreased <br /> I` approximately 21 feet as compared to the current level. <br /> �I <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 screened lIfrom 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 />