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THRIFTY OIL � �Tl <br /> PF,„ ," SrTVICC <br /> 93 OCT -7 FM 2- 11 <br /> October 4, 1993 <br /> Mr Mike Infurna <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 77triAy Oat Co. Station #172 <br /> 7647 Pacific Ave <br /> Stockton, CA 95207 <br /> Quarterly Monitoring Report <br /> 2nd. Quarter 1993 <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 2nd 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 is reported by Thrifty in-house environmental staff <br /> SITE REMEDIATION <br /> To date, remediation of soil and groundwater has not been conducted at the site As requested <br /> by PHS/EHD, a workplan for additional investigation at the site with regard to definition of the <br /> vertical and lateral extent of soil and groundwater contamination was submitted by Thrifty Oil <br /> Co in-house staff on April 14, 1992 Thrifty anticipates that this workplan will be implemented <br /> during the 4th quarter 1993 <br /> GROUNDWATER MONITORING <br /> On May 20, 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 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 52 71 to 53 80 feet below grade which is a rise of about 0 9 feet <br /> from last quarter Using the depth to groundwater and survey data for the site, a groundwater <br /> contour map was developed The contour map is presented as Figure 2 The contour snap <br /> suggests that the potentiometnc surface of the shallow groundwater is generally flat across the <br />. site with a slight eastward trend This data is consistent with last quarters interpretation <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, California 90240 (310) 923-9876 <br />