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. THRIFTY OIL CO. <br /> April 1, 1996 <br /> Mr. Mike Infurna <br /> Public Health Services/Environmental Health Division <br /> County of San Joaquin APR 2 11 1995 <br /> P O Box 2009 (1601 E Hazelton Ave ) ENVIRONMENTAL HeALTH <br /> Stockton, California 95201 PERMIT/SERVICES <br /> RE Thd ty Oil Company Station #172 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> Quarterly Monitonng Report <br /> I st Quarter 1996 <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 1996 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 July 1995, <br /> Thrifty completed a subsurface investigation that included installation of three new off-site wells <br /> (MW5, MW6 and MW9) and abandonment of six on-site wells This work was preliminary to <br /> site reconstruction efforts which included removal and replacement of the underground tanks and <br /> construction of a new market building Thrifty's Subsurface Investigation Report dated <br /> September 6, 1995 contains details regarding this investigation <br /> GROUNDWATER MONITORING <br /> On February 29, 1996, the site was visited by an Earth Management Co (EMC) technician <br /> The EMC technician obtained depth to groundwater data and observed wells for the presence <br /> of free product Groundwater depth measurements were taken from the top of PVC well casing <br /> using an Oil Recovery Systems interface probe capable of measurements to within 0 01 feet <br /> Using the depth to groundwater and survey data, a groundwater contour map was developed <br /> The contour map is presented as Figure 1 The contour map suggests that the potentiometric <br /> surface of the shallow groundwater is generally flat across the site with an eastward trend The <br /> hydraulic gradient is about 0 001 This data is consistent with previous quarterly interpretations <br /> Qo <br /> 10,000 Lakewood Boulevard, Downey, CA 90240 4082 * (310) 923-9876 <br />