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T <br /> THRIFTY OIL CO. <br /> January 18, 1994 <br /> Mr Mike Infurna <br /> Public Health Services/Environmental Health Division <br /> County q of San Joaquin ! ' <br /> P O Box 2009 {1601 E Hazelton Ave ) o ' <br /> Stockton, California 95201 'rcpt, <br /> RE Thni Oil ComPany Station #172 <br /> 7647 Pacific Avenue <br /> Stockton, CA 95207 <br /> Quarterly Monttonng Report <br /> 4th Quarter 1994 <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 4th quarter 1994 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 oil and groundwater has not°been conducted at the site In April 1994, <br /> Thrifty completed a site assessment investigation that included installation 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 November 8, 1994, 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 /> Depth to groundwater ranged from 51 03 to 52 04 feet below grade which is a slight drop of <br /> from the last reported data Using the depth to groundwater and survey data for the site, a <br /> groundwater contour map was developed The contour map is presented as Figure I The <br /> contour map suggests that the potentiometric surface of the shallow groundwater is generally flat <br /> across the site with an eastward trend, Thehydraulic gradient is about 0 003 This data is <br /> steeper than last quarter's interpretation <br /> i <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, CA 90240-4082 9 (310) 923-9876 <br />