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r� <br /> L <br /> THRIFTY OIL CO. <br /> May 31, 1994 Nsulyz J� <br /> JUN 0 0 1994 <br /> Mr Michael Collins ENVIRONMENTALHEALTHPublic Health Services/Environmental Health Division PERMl71SERVICEs <br /> County of San Joaquin <br /> P.O. Box 2009 (1601 E Hazelton Ave ) <br /> Stockton, California 95201 <br /> RE. Ad& Oil Co. Station #171 <br /> .1250 North Wilson Way <br /> Stockton, CA 95205 <br /> Quarterly Monitoring Report, Ist. quarter 1994 <br /> Free Product Removal <br /> Dear Mr. Collins, <br /> Thus letter serves as a progress monitoring report for the above mentioned service station In <br /> addition data regarding free product removal is included as requested in PHS letter of May 18, <br /> 1994 This status report presents site monitoring efforts up to the 1st. quarter, 1994 and product <br /> removal activities to date. Thrifty Oil Co. has retained Earth Management Co (EMC) to <br /> conduct quarterly monitoring and sampling activities at the site The data collected by EMC is <br /> reported by Thnfty in-house environmental staff. <br /> ITE REMEDIATI <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 off-site monitoring wells Field work has been completed and a report describing the results L <br /> of the investigation should be available by the end of the second quarter. <br /> GROUNDWATER MONITORING <br /> The latest groundwater sampling event was conducted on March 8, 1994, The site was visited <br /> by an Earth Management Co (EMC) technician The EMC technician obtained depth to <br /> 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 1. The contour map <br /> suggests that the potentiometnc surface of the groundwater slopes to the east across the site <br /> Qo <br /> a <br /> 10000 Lakewood Boulevard, Downey, CA 90240-4082 • (310) 923-9876 <br />