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THRIFTY ©IL CO . <br /> September 1, 1998 <br /> Mr Michael J Infurna, Jr , R E H S <br /> San Joaquin County <br /> Public Health Services/Environmental Health Division <br /> P O Box 2009 (1601 E Hazelton Avenue ) ®Px4yTa <br /> Stockton, California 95205 <br /> RE Thrifty Oil Co. Station #171 SEP 0 & 1998 <br /> 1250 North Wilson Way ENVIRONM <br /> Stockton, Ca PERMIT/SERVICES�w <br /> Semi Annual Report C� <br /> Dear Mr Inf irna ` <br /> Presented herein is the Status Report prepared for Thrifty Oil Co Station#171 located at 1250 North <br /> Wilson Way, Stockton, Ca (Figure 1) Presented in this report are the results of the quarterly <br /> groundwater monitoring program for the 3rd and 4th quarters 1996 This report presents data <br /> collected during the period from July 1996 thru December 1996 <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 November 1996 is presented in Table 1 In general, <br /> groundwater occurs under water table conditions beneath the station at depths ranging from 51 65 <br /> to 53 50 feet below ground surface A groundwater elevation contour map based upon November <br /> 14, 1996 data is presented as Figure 1 The general direction of groundwater flow beneath the site <br /> is toward the east-northeast <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, T13-8, 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 Figure 2, Figure 3, and Figure 4 illustrates dissolved <br /> benzene, TPH, and MTBE concentrations in groundwater, respectively utilizing the data collected <br /> on November 14, 1997 <br /> All interpretations expressed in this report are based upon review of data collected by EMC <br /> IP <br /> 13539 E Foster Rd , Santa Fe Springs,CA 90670-0138 9(562)923-9876 <br />