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r <br /> THRIFTY OIL CO. <br /> Rgut <br /> May 13, 1993 MAY 17 1993 <br /> ENVIRONMENTAL LK STH <br /> PERMITJS <br /> Mr Michael Collins <br /> Public Health Services/Environmental Health Division <br /> County of San Joaquin <br /> P O. Box 2009 (1601 E Hazelton Ave ) <br /> Stockton, California 95201 <br /> RE- 7hd& Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Quarterly Monitoring Report <br /> Ist. Quarter 1993 <br /> Dear Mr Collins, <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, 1993 Thrifty Oil Co. has <br /> retained Earth Management Co (EMC) to conduct quarterly monitoring and sampling activities <br /> at the site. The data 1s reported by Thnfty in-house environmental staff. <br /> SITE REMEDIATION <br /> To date, no remediation of soil and groundwater has been conducted at the site On January 20, <br /> 1993, Thnfty submitted a report describing the results of an additional investigation at the site <br /> with regard to definition of the vertical and lateral extent of soil and groundwater contamination <br /> Thrifty is in the process of evaluating the data in order to prepare a workplan for further site <br /> characterization A workplan will be prepared after completing an additional groundwater <br /> sampling event <br /> GROUNDWATER MONITORING <br /> On March 31, 1993, 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 the 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 69.86 to 71 08 feet below grade which is rise of about 4 to <br /> 5 feet compared to the data collected during the last site investigation Using the depth to <br /> groundwater and survey data for the site, a groundwater contour map was developed The <br /> contour map is presented as Figure 2 The contour map suggests that the potentiometnc surface <br /> 01 of the groundwater slopes to the north-northeast across the site. <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, California 90240 (310) 923-9876 <br />