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THRIFTY OIL CO . <br /> October 29, 1999 <br /> Mr Michael J Infurna Jr <br /> Senior REHS <br /> Site Mitigation Unit IV/LOP <br /> 304 East Weber St , Fifth Floor <br /> Stockton, CA 95202 <br /> RE Former Thrifty Oil Co. Station #171 <br /> 1250 North Wilson Way <br /> Stockton, CA 95205 <br /> 3rd Quarter 1999,Status Report <br /> Dear Mr Infurna <br /> Presented herein is the Third Quarter 1999, Status Report prepared for Thrifty Oil Station #171 <br /> located at 1250 Wilson Way, Stockton,California(Figure 1) Presented in this report are the results <br /> of the site monitoring efforts conducted during the Third Quarter 1999 Thrifty Oil Co (Thrifty) <br /> has retained the services of Earth Management Company (EMC) to conduct quarterly monitoring <br /> and sampling activities at this site <br /> Groundwater Monitoring <br /> Depth to groundwater is measured in each monitoring well on a quarterly basis In general, <br /> groundwater occurs under water table conditions beneath the station at depths ranging from 38 18 <br /> feet below ground surface(bsg)in monitoring well TB-10 to 40 36 feet bgs in monitoring well MW- <br /> 6 A groundwater elevation contour map based upon August 18, 1999 data is presented as Figure <br /> 1, and the direction of groundwater flow is toward the northeast with a hydraulic gradient of about <br /> 0 001 feet/foot to 0 009 feet/foot <br /> Quarterly Groundwater Sampling <br /> As part of the groundwater monitoring program, groundwater samples were obtained from <br /> monitoring wells MW-3R, MW-4, MW-5, MW-6, TB-1, TB-7, TB-8, and TB-10 on August 18, <br /> 1999 Groundwater samples were obtained by EMC and delivered in a chilled state following strict <br /> ��1� 13539 E Foster Rd, Santa Fe Springs, CA 90670-0138•(562)923-9876 <br />