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t3 <br /> THRIFTY OIL.. CO . <br /> November 5, 1998 <br /> Mr Michael J Infurna Jr <br /> Senior REHS " <br /> Site Mitigation Unit IV/LOP = <br /> 304 East Weber St , Fifth Floor <br /> Stockton, California 95202 <br /> RE Thrifty Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, Ca <br /> 3rd Quarter A&nitoring Re ort 1998 <br /> Dear Mr Infurna <br /> Presented herein is the 3rd Quarter 1998 Monitoring Report prepared for Thrifty Oil Co Station <br /> #171 located at 1250 Wilson Way, Stockton, Ca (Figure 1) Presented in this report are the results <br />• of the quarterly groundwater monitoring program conducted during the period from July thru <br /> September, 1998 <br /> GROUNDWATER MONITORING <br /> Depth to groundwater is measured in each monitoring well on a quarterly basis Gauging data <br /> obtained from November 1992 through August 1998 is presented in Table 1 In general, <br /> groundwater occurs under water table conditions beneath the station at depths ranging from 39 60 <br /> feet below surface grade(bgs) in monitoring well MW-5 to 47 85 bgs in monitoring well TB-7 A <br /> groundwater elevation contour map based upon August 12, 1998 data is presented as Figure 1 A <br /> groundwater depression is present in the vicinity of monitoring wells TB-7 and TB-8 <br /> QUARTERLY GROUNDWATER SAMPLING <br /> As part of the groundwater monitoring program, groundwater samples were obtained from <br /> monitoring wells MW-3R, MW-4, MW-5, MW-6, TB-1, TB-7, TB-8, and TB-10 Groundwater <br /> samples were obtained by Earth Management Co (EMC) and delivered in a chilled state in a light <br /> proof ice chest following strict Chain-of-Custody procedures to a state certified laboratory and <br /> analyzed for volatile organic hydrocarbons by EPA method 8020,and total petroleum hydrocarbons <br /> (TPH) by EPA method 8015 modified TPH, benzene, and MTBE concentrations are plotted and <br /> contoured in Figures 2 through 4, respectively <br />• Q� <br /> �� 13539 E Faster Rd.Santa Fe Springs, CA 90670-0138•(562)923-9876 <br />