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' Site Background Information Local Food Store <br /> Page 3 of 3 <br /> SITE ASSESSMENT AND REMEDIATION ACTNITIES <br /> ' A summary of site assessment activities to date include <br /> • 13 April 2000, ten soil probe borings (B 1 through B 10) were advanced at the site TPH-g, <br /> 1 <br /> BTEX, MTBE and/or tertiary butanol (TBA) were detected in each of eight grab bround <br /> water samples Low concentrations of TPH-g and BTEX were detected in soil samples <br /> ' collected from four of the ten soil borings Significant concentrations of MTBE were <br /> detected in soil samples collected from a boring advanced near the former tank pit <br /> ' On 23 May 2000 three ground water monitoring wells (MW-1 through MW-3) were <br /> installed <br /> ' On 02 October 2000, oneground water monitoring well (MW-4) was installed <br /> • On 22 January 2002, an 8-hour step draw down ground water extraction test,and 04 and 05 <br /> February 2002, a 36-hour constant rate ground water extraction feasibility test were <br /> ' performed at the site to determine the feasibility of ground water extraction as a remediation <br /> alternative for the site <br /> 10 • On 21 July 2003,one deep-screened(50 to 55 feet bsg)ground water monitoring well(MW- <br /> 5)was installed No analytes of concern were detected In submitted soil samples <br /> ' • Quarterly ground water sampling and reporting has been ongoing since June 2000 <br /> The soil boring data indicates that silt underlies the site to a depth of approximately 15 feet below <br /> ' surface grade (bsg) and in turn is underlain by a silty sand at depths between 15 and 20 feet bsg <br /> Generally,bluish gray, fine-grained silt and lean clay were encountered In samples collected from <br /> soil boring MW-5 at depths between 35 feet and 40 feet bsg Medium to dark gray poorly graded fine <br /> ' sand with silt and poorly graded line sand were encountered between 45 feet and 54 5 feet bsg Silty <br /> clay was encountered at approximately 55 feet bsg Current ground water monitoring data at the site <br /> indicates that ground water occurs at a depth of approximately 8 feet bsg Historically,ground water <br /> ' flow direction has been toward the northeast <br /> ' The approximate lateral extent of impacted soil and ground water has been defined by the installation <br /> of soil borings and the current monitoring well network The vertical extent of dissolved <br /> hydrocarbons in the former UST area may require additional assessment <br /> t ' <br /> ' Advanced GeoEnvLronmental,Inc <br />