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r <br /> 3 <br /> ( D 'ENT VIE A <br /> LTH <br /> 'l 7 <br /> THRIFTY OIL CO. <br /> February 24, 1994 <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 Thr{fty Oil Co. Station #172 <br /> 7647 Pacific Ave <br /> Stockton, CA 95207 <br /> Quarterly Monitoring Report <br /> 41h. 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 4th. 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 revised workplan for additional investigation at the site with regard to definition <br /> of the vertical and lateral extent of soil and groundwater contamination was submitted by Thrifty <br /> Oil Co. in-house staff and the work is currently in progress <br /> GR OUNDWATER MONITORING <br /> On November 30, 1993, 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 52 42 to 53 55 feet below grade which is a rise of about 2 <br /> 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 with a slight eastward trend The site specific gradient is about 0 0018 ft /ft. <br /> This data is consistent with last quarters interpretation. <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, California 90240 (310) 923-9876 f <br />