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THRIFTY OIL CO. �� ._ , z� <br /> April 1, 1993 APR Q 5 1993 <br /> ENVIRONMENTAL KALTH <br /> PERMIT/SERVICES <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- nd ty Oil Co. Station #172 <br /> 7647 Pac(flc Ave <br /> Stockton, CA 95207 <br /> Quarterly Monitoring Report <br /> 1st. Quarter 1993 - <br /> Dear Mr. Infuma, <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 is reported by Thrifty in-house environmental staff. <br /> SITE REMEDIATION <br /> To date, no remediation of soil and groundwater has 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 This workplan will be evaluated after more data is <br /> collected from the wells <br /> GROUNDWATER MQMT RING <br /> On February 24, 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 53.60 to 54 68 feet below grade which is a rise of about 3.5 <br /> feet from last quarter 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 2. The <br /> contour map suggests that the potentiometnc surface of the shallow groundwater is generally flat <br /> across the site with a slight eastward trend. This data is consistent with last quarters <br /> interpretation <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, California 90240 (310) 923-9876 ` ,v <br />