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a CVAT A S S O C I A T E S I N C On March 29 and 30, 1988, three monitoring wells (MW1, MW2, and MW3) were installed at the site and a sensitive receptor survey within a 2,000-foot radius of the site was conducted by Kleinfelder. According to Kleinfelder's Groundwater Assessment Report dated April 12, 1988, petroleum hydrocarbons were not detected at or above laboratory reported detection limits in the groundwater samples collected from MW1, MW2, and MW3 on April 1 and 4, 1988. The groundwater flow direction was reported to be toward the north. On April 19, 1988, an additional monitoring well (MW4) was installed north of the former location of the USTs. According to Kleinfelder's Additional Monitoring Well report dated April 22, 1998, petroleum hydrocarbons were detected in the groundwater sample collected from MW4 on April 19, 1988. The groundwater flow direction was reported to be toward the northwest on April 20, 1988. In late April 1988, the open excavation associated with the former USTs was expanded by excavating petroleum impacted vadose zone soils. Kleinfelder's Soil Removal Report dated May 3, 1988, approximately 350 to 400 cubic yards of soil were excavated from April 25 to 28, 1988. Laboratory analyses of soil samples collected from the sidewalls of the enlarged excavation indicated low concentrations of petroleum hydrocarbons remained at the south and southeastern portion of the excavation. On February 26, 1993, Parker Environmental Services (P.E.S.)advanced seven soil borings (131-11 through 131-17). Soil samples were collected from each boring and a groundwater sample was collected from each boring except 131-17. Petroleum hydrocarbons were detected in soil samples collected from all the borings except 131-11 and 131-13. Petroleum hydrocarbons were detected in all of the groundwater samples. Water level measurements collected at the site on March 2, 1993 indicated the groundwater flow direction was to the southeast. Refer to P.E.S. Interim Report on Subsurface Investigation Work at Cheaper! # 37 for more details. From July to October 1995, P.E.S. conducted subsurface investigation activities that included installing four monitoring wells (MW5 through MW8) and advancing 14 hand augured soil borings (138 through B21). Borings B15 through B21 were advanced off-site to the west, southwest, and south. Groundwater was encountered at approximately 6.5 feet bgs. Soil and groundwater samples were collected from B8, B10 through B18, B20, B21, and MW5 through MW7. A groundwater sample was also collected from MW8. Petroleum hydrocarbons were detected in all of the soil samples except for the samples collected from MW,51-'throu h MW7, B14 located east of the former UST location, and B20 and B21 located off-site to the southwest and south, respectively. Petroleum hydrocarbons were detected in the groundwater samples except for the samples collected from B14, B20, B21, MW1, MW2, MW3, MW6, and MW7. MW4 was not sampled due to the presence of approximately 0.02 inches of free product. The reported groundwater flow direction on September 25, 1995 was approximately due north. Refer to the report prepared by P.E.S. titled Environmental Site Investigation Methods and Findings: sAenviromental\25847\37\reports\wkp.doc 2-