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THRIFTY OIL CO. <br /> I�' '^ ' w ,";;;� f-T} <br /> - <br /> 011 11`3-3 PH ?: 05 <br /> February 24, 1994 <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 Thd& Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Quarterly Monitoring Report <br /> 4th. Quarter 1993 <br /> Dear Mr Collins, <br /> This letter serves as a progress monitoring report for the above mentioned service station. This <br /> status report presents site monitoring efforts up to the 4th quarter, 1993 Thrifty Oil Co has <br /> f retained Earth Management Co. (EMC) to conduct quarterly monitoring and sampling activities <br /> at the site. The data collected by EMC 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 Currently, <br /> Thrifty is conducting an additional investigation which consists of the installation of two off-site <br /> and one on-site monitoring well. A report describing the results of the investigation should be <br /> available by the first of April, 1994 <br /> GROUNDWATER MONITORING <br /> The latest groundwater sampling event was conducted on December 13, 1993, The site was <br /> visited by an Earth Management Co (EMC} technician The EMC technician obtained depth <br /> to groundwater data and observed wells for the presence of free product. Groundwater depth <br /> measurements were taken from the top of the PVC well casing using an Oil Recovery Systems <br /> interface probe capable of measurements to within 0.01 feet Depth to groundwater ranged from <br /> 70 95 to 72 40 feet below grade which is drop of about 1 to 2 feet compared to the previous <br /> reported data 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 map <br /> suggests that the potentiometric surface of the groundwater slopes to the north-northeast across <br /> the site <br /> Qo <br /> 10000 Lakewood Boulevard, Downey, California 90240 (310) 923-9676 <br />