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i r <br /> THRIFTY OIL CO. <br /> r 77- <br /> March 23, 1994 <br /> ._' Ar, 0 3 ]995 <br /> Mr Mike Infurna Ef\'V,RONMrNTAL 1',A'_TH <br /> Public Health Services/Environmental Health Division t ERivilf1.,JRV+CLS <br /> County of San Joaquin <br /> P O Box 2009 (1601 E Hazelton Ave.) <br /> Stockton, California 95201 <br /> RE Thri <br /> :ft Oil Company Staho <br /> 7647 Pacific Avenue Stockton, CA 95207 2��jo <br /> Quarterly Monitoring Report M05 <br /> 1st Quarter 1995 <br /> Dear Mr Infurna <br /> This letter serves as a quarterly monitoring report for the above mentioned service station This <br /> status report presents site monitoring efforts during the 1st quarter 1995 Thrifty Oil Co has <br /> retained Earth Management Co (EMC) to conduct quarterly monitoring and sampling activities <br /> at the site The data is reported by Thrifty's in-house environmental staff <br /> SITE REMEDIATION <br /> To date, remediation of soil and groundwater has not been conducted at the site In April 1994, <br /> Thrifty completed a site assessment investigation that inc u ins ation of new wells MW7 <br /> and MW8, and presented recommendations for additional site work Thrifty's Site Assessment <br /> Report dated June 13, 1994 contains details regarding this investigation <br /> GROUNDWATER MONITORING <br /> On February 8, 1995 the site was visited by an Earth Management Co. (EMC) technician. The <br /> EMC technician obtained depth to groundwater data and observed wells for the presence of free <br /> product Groundwater depth measurements were taken from the top of PVC well casing using <br /> an Oil Recovery Systems interface probe capable of measurements to within 0 01 feet Depth <br /> to groundwater ranged from 48 18 to 49 23 feet below grade which represents a rise of about <br /> 2 feet from the last reported data Using the depth to groundwater and survey data for the site, <br /> a groundwater contour map was developed The contour map is presented as Figure 1 The <br /> contour map suggests that the potentiometric surface of the shallow groundwater is generally flat <br /> across the site witheastward t d The hydraulic gradient is about 0 002 This data is <br /> consistent with previous quarterly interpretations <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, CA 90240-4082 • (310) 923-9876 <br />