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THRIFTY DIL. CO . <br /> April 22, 1999 � 1 <br /> 1 APR2 � r; <br /> e1wipu 1999 <br /> Mr Michael J Infurna Jr '�`t 16N 7 <br />' Senior REHS PEA�/117'/S�R�(C, HL�� <br /> Site Mitigation Unit IV/LOP S <br /> ' 304 East Weber St , Fifth Floor <br /> Stockton, CA 95202 <br /> RE Thrifty Oil Co. Station 4171 <br /> 1250 North Wilson Way <br /> ' Stockton, CA 95205 <br /> 1st Quarter Monitoring Report, 1999 <br /> Dear Mr Infurna <br /> Presented hereinis the First Quarter 1999 Monitoring Report prepared for Thrifty Oil Co Station <br /> 4171 located at 1250 Wilson Way, Stockton, California(Figure 1) Presented in this report are the <br /> results of the quarterly groundwater monitoring program conducted on February 25, 1999 Thrifty <br /> Oil Co has retained the services of Earth Management Company (EMC) to conduct quarterly <br /> t monitoring and sampling activities at this site Field activities were recorded in the field reports, <br /> copies of which are presented in Appendix B The data is reported by Thrifty's in-house <br /> environmental staff <br /> 1 <br /> GROUNDWATER MONITORING <br /> ' Depth to groundwater is measured in each monitoring well on a quarterly basis Gauging data <br /> obtained from November 1992 through February 1999 is presented in Table 1 In general, <br /> ' groundwater occurs under water table conditions beneath the station at depths ranging from 37 85 <br /> feet below surface grade (bgs) in monitoring well MW-4 to 39 75 bgs in monitoring well MW-6 <br /> A groundwater elevation contour map based upon February 25, 1999 data is presented as Figure 1 <br /> ' Groundwater has a radial mound which flows to the southwest and the east with an easterly gradient <br /> of 0 89 feet/foot <br /> V-01 <br /> 13539E Foster Rd, Santa Fe Spnngs, CA 90670-0138•(562)923-9876 <br />