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1 <br />' On February 26, 1993, Parker Environmental Services (P E S ) advanced seven soil borings <br /> (BH 1 through B117) Soil samples were collected from each boring and a groundwater sample <br />' was collected from each boring except BI-17 Petroleum hydrocarbons were detected in soil <br /> samples collected from all the borings except BH1 and B113 Petroleum hydrocarbons were <br /> detected in all of the groundwater samples Water level measurements collected at the site on <br /> March 2, 1993 indicated the groundwater flow direction was to the southeast Refer to P E S <br /> Interim Report on Subsurface Investigation Work at Cheaper # 37 for more details <br />' From July to October 1995, P E S conducted subsurface investigation activities that included <br /> installing four monitoring wells (MW5 through MW8) and advancing 14 hand augured soil <br /> borings (B8 through B21) Borings B15 through B21 were advanced off-site to the west, <br /> southwest, and south Groundwater was encountered at approximately 6 5 feet bgs Soil and <br /> groundwater samples were collected from B8, B10 through B18, B20, B21, and MWS through <br /> MW7 A groundwater sample was also collected from MW8 Petroleum hyd ocarbons were l.4, <br /> detected in all of the soil samples except for the samples collected from MWIthrough MW7, 9-S-66 <br /> B14 located east of the former UST location, and B20 and B21 located off-site to the southwest <br /> and south, respectively Petroleum hydrocarbons were detected in the groundwater samples <br />' except for the samples collected from B14, B20, B21, MWI, MW2, MW3, MW6, and MW7 <br /> MW4 was not sampled due to the presence of approximately 0 02 inches of free product The <br /> reported groundwater flow direction on September 25, 1995 was approximately north Refer to <br /> the report prepared by P E S titled Environmental Site Investigation Methods and Findings <br /> Drilling of Soil Borings, Drilling and Installation of Groundwater Monitoring Wells Collection <br /> and Analyses of Soil and Groundwater Samples, dated November 17, 1995 for more <br /> information <br />' In a letter dated April 11, 2002, the EHD indicated that upgradient monitoring wells MW2 and <br /> MW3 could be reduced to annual monitoring and that the lateral and vertical extent of soil <br /> contamination remains undefined The EHD requested submittal of a workplan to define the <br />' lateral and vertical extent of soil contamination In response to the EHD request, H20GEOL <br /> submitted the Work Plan for Additional Soil Characterization dated June 10, 2003, which <br /> proposed advancing 14 hand auger borings at the site for the purpose of collecting soil <br />' samples In a letter dated November 14, 2003, the EHD indicated that the proposed scope in <br /> the H20GEOL workplan was not adequate or necessary The EHD requested that a workplan <br /> be prepared in the context of a site conceptual model that includes analytical data collected <br />' during removal of a waste oil tank from the site in September 2003 <br />' ATC Associates Inc prepared a workplan titled Workplan for Additional Subsurface <br /> Investigation dated April 19, 2004 The workplan proposed the completion of thee onsite cone <br /> penetration borings and six direct push onsite and offsite soil borings The EHD authorized <br /> the proposed subsurface investigation activity in their letter dared July 12, 2004 <br /> r <br /> i <br /> 14 <br /> S\Enviromcnta\258471Report WM doe 2 <br />