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1 <br /> > previously been taken out of service and abandoned in place by removing the <br /> fuel and filling it with sand The western-most gasoline UST system failed a <br /> tank Integrity test in December 1986, which Initiated the permanent removal <br /> of both UST systems The two diesel UST systems were removed in <br /> September 1989 <br /> Following the December 1986 tank Integrity test failure, Environmental <br /> Science & Engineering (ESE) drilled five borings around the perimeter of the <br />' two adjacent gasoline USTs and collected soil samples for analysis The data <br /> Indicated that petroleum-hydrocarbon Impact in soil extended to a depth of at <br /> least 28 feet below-ground-surface (bgs) The data are contained a5 an <br /> ' appendix in Anderson Consulting Group's (ACG) December 19, 1991 <br /> Problem Assessment Report <br /> During the April 1987 UST removals, Impacted soil was excavated to 28 feet <br /> bgs, which included the area where ESE had drilled the five borings <br /> Approximately 450 cubic yards of soil, including some 120 cubic yards that <br /> was noted to be Impacted with gasoline, was land-farmed with guidance from <br /> the San Joaquin Valley Air Pollution Control District (SJVAPCD) <br /> ' In July and September 1987, ESE installed three groundwater-monitoring <br /> wells (MW-1 through MW-3) In January 1988, ACG installed wells MW-4 <br /> and MW-5 ACG subsequently drilled soil borings 90-1 and 90-2 and <br /> installed wells MW-6 and MW-7 in February 1990 and then MW-8 in <br /> September 1990. PSC (formerly Burlington Environmental) Installed wells <br /> MW-9 through MW-13 in March 1994, then piezometers PZ-1 and PZ-2, and <br /> ' air-sparging well SP-1 in September 1994 <br /> PSC performed a soil-vapor-extraction (SVE) and air-sparging pilot test in <br /> ' October and November of 1994 to evaluate the effectiveness of this <br /> remediation technology SVE tests were performed using well MW-1, and <br /> air-sparging tests were performed using well SP-1 PSC reported the results <br /> of the tests in the February 1, 1995 Final Remediation Plan, which indicated <br /> that SVE and air-sparging would be effective in remediating hydrocarbon <br /> 1 impact <br /> In June 1995, PSC proceeded with the installation of air-sparging wells SP-2 <br /> through SP-6 However, Implementation of the sparge and SVE remediation <br /> ' was postponed due to naturally occurring petroleum-hydrocarbon <br /> concentration reductions that were observed at the time <br /> ' In May 1999, PSC performed a subsurface Investigation using cone- <br /> penetrometer-testing (CPT) technology Soil and groundwater samples were <br /> submitted for analysis from three CPT borings (CPT-1 through CPT-3) The <br /> ' CPT investigation Indicated that the lateral extent of impacted groundwater <br /> • was largely contained within the Earthgram's property boundaries PSC <br /> r <br /> 12 <br /> Quarterly Groundwater Monitoring Report <br /> 4th Quarter-November 2005 <br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by PSC Environmental Services <br /> Investigative and Quarterly Report 14th Quarterly Report 11_2005 duc February 24,2006 <br />