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i <br /> E-Z SERVE <br /> MANAGEMENT COMPANY R, E CEi�V E D <br /> APR 14 1993 <br /> ENVIRONMENTAL HEALTH <br /> RERMIT/90VIGES <br /> April 7, 1993 <br /> Ms. Laurie Cotulla <br /> Program Manager <br /> San Joaquin County <br /> Public Health Services <br /> P.O. Box 2009 <br /> Stockton, California 93276 <br /> Re: Work Plan to Install Additional Monitoring Wells <br /> E-Z Serve #100878 <br /> 1012 West Yosemite <br /> Manteca, California <br /> Dear Ms. Cotulla: <br /> The ob)ecti.ve of this Work Plan is to outline a scope of work to <br /> install additional monitoring wells intended to assess the extent <br /> of dissolved petroleum hydrocarbons at the subject site, located at <br /> 1012 West Yosemite, Manteca California. <br /> Previous work has included the advancement of 6 soil borings and <br /> the .installation of six monitoring wells. Three monitoring wells <br /> were constructed by Associated Soils Analysis and the results are <br /> described in the report dated April 1, 1991. Three monitoring <br /> wells were constructed by Tank Protect Engineering and are <br /> described in a report dated August 24 , 1992 . <br /> The results of the laboratory analysis of soil samples collected <br /> during well installation indicate the presence of petroleum <br /> constituents at low concentrations in borings labeled MW-1, MW--2, <br /> and MW-5. Petroleum constituents in soils at MW-3 were found to be <br /> in moderate concentrations. Groundwater is present at <br /> approximately 18 feet below grade. The direction of groundwater <br /> flow is toward the north at a gradient of approximately 0. 0012 foot <br /> per foot. Groundwaterlsamples collected from each monitoring well <br /> contain' dissolved benzene at concentrations ranging from nondetect <br /> to ' 24 ppb.l The initial samplingl event indicates the sample <br /> collected from MW-1 contained the highest dissolved benzene <br /> concentration. <br /> The fourth quarter 1992 monitoring report indicates' slight changes <br /> in dissolved benzene concentrations over the site. Well MW--2 has � I <br /> indicated the highest levels with the December sampling event f <br /> resulting in 94 ppb. <br /> I <br /> 2550 NORTH LOOP WEST,SUITE 800 <br /> 'II d 1, X 92202EPO 11 <br /> I HOUSTON;I TEXAS 77292-2021 <br /> I ! I II <br /> (713)884-4340 I I l l f I I `I I I U. <br /> 11 I I I 'bl I I I I , fllII11 i t I <br /> I I lill II ,l ,I I I bl <br />