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� ' � PUBLIC UEALTH St'R)J�- CES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION S <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor * P. O. Box 388 9 Stockton <br /> ,:',C,.C L-952Q1--0388-_)- i , ) <br /> MAILED NOV 2 9 1991Z 209/468-3420 <br /> KENNETH R EARNEST QUENTIN KIRSH <br /> ULTRAMAR INC 190 EAST AMBER WAY <br /> P 0 BOX 466 <br /> HANFORD CA 93230 <br /> HANFORD CA 93232-0466 <br /> RE: Former Beacon Cardlock #610 SITE CODE: 1765 <br /> 3300 Waterloo Road <br /> Stockton-, CA t 95205- <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the "Third Quarter 1995 Ground Water <br /> Monitoring Report' dated October 17, 1995 which was pre:' ared by El Dorado <br /> fi p <br /> Environmental. PHSIEHD has prepared the following' comments for your <br /> consideration. <br /> The report.included the results-of the groundwater si�mplirigh o ducted on August 7,' <br /> .1995.and August..25, 71995 which evidenced groundw'ater'-d-ohtamination,., ,PHS/EHD - <br /> requested the groundwater.sampling in..order-to verify that�th :rise in .groundwater <br /> elevation did not facilitate the migration-of residual soil con' ameination,into:the' <br /> groundwater. Since groundwater has been contaminated, !PHS/EHD requires <br /> additional quarterly sampling events to evaluate the 6xtentilof contamination. <br /> PHS/EHD does not concur with your proposal to discontinue quarterly monitoring. <br /> As per PHS/EHD correspondence dated July 14, 1995 which summarized the <br /> k <br /> meeting held on July 7, 1995, should data suggest that groundwater may be <br /> adversely impacted, a feasibility study must be cond6cted. The feasibility study must <br /> evaluate at least two remedial alternatives. <br /> .. . ....... The most cost effective alternative for-- <br /> restoring-or pr6teliifi`g� the be�nefi6�tal use will _b_e`se-Ie=c-t`ed_in1_Ke <br /> It correcti,;i—a6ti`6­n'p(in_._—_ <br /> The depth to groundwater from the most recent monitoring below <br /> �`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 �i rn� onit6ring 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 /> The,changes in the-depth to groundwater pose a particu I ar��problem' with -fixed <br /> monitoring wells.­A.brief evaluation of.the construction of the;monitoring-.Wi�ll�;,-. :'--- <br /> indicated-that monitoring e <br /> ,w Ils,' MW1 MW4 were scre:'etied"frUm'.a0proxiniately 33 to <br /> 63 feet below grade and .M'W5 - MW7 were,screened from '70 -to'90'feet beloWgrade. <br /> li4A Division of San JoaqUin County Health Cafe Services <br />