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_ 4 <br /> I <br /> lJ <br /> Ms. Vicki McCartney Project No. 8800401A.0201 <br /> } October 26, 2004 <br /> Page 2 <br /> dispenser islands. Soil samples were collected from beneath the dispensers and along <br /> the product lines at a depth of approximately 3.5 feet below ground surface(bgs). <br /> Remedial activities conducted in January 2000 included removal of approximately <br /> 262 tons of impacted soil in the area of the dispenser...and product lines. Excavation was <br /> restricted laterally by concrete canopy footings and asphalt surfacing. Maximum <br /> excavation depth was 10 feet bgs due to shallow groundwater depth. <br /> `- Five Geoprobe® borings (GP-1 through GP-5) were advanced on August 15 and..16, <br /> 1 2000. Each boring was advanced to groundwater, at which time.a discrete water sample <br /> was collected. Following groundwater sample collection, each boring was advanced to a <br /> maximum depth of 30 feet bgs. <br /> Three groundwater monitoring wells (MW-1 through MW-3) were installed on <br /> September 6, 2000. The well locations were selected based upon results of the <br /> 3` " Geoprobe° investigation. Quarterly groundwater monitoring has been conducted at the <br /> site since the First Quarter 2001 event. <br /> On May 23 2002 two monitoring - <br /> y o itonng wells (MW 4 and MW-5) were installed. The two <br /> well borings were drilled to a total depth of 25 feet bgs. One deep boring was advanced <br /> adjacent to well MW-1 to define the vertical extent of methyl tert-butyl ether (MtBE) in <br /> F soil and groundwater at the site. This boring was continuously cored from 30 feet bgs to <br /> the total depth of 54 feet bgs to provide a complete lithologic description of subsurface <br /> rl <br /> conditions. <br /> A dual phase extraction DPE test was conducted from June 10 through 15 2 2 <br /> P (DPE) gh 00 The <br /> t DPE test was conducted by simultaneously extracting soil vapor and groundwater from <br /> IJ well MW-1. Based on the results of the DPE test, DPE appears to be an effective <br /> .i remedial alternative to remove MtBE and other oxygenates from soil and groundwater, <br /> and control off-site migration. <br /> On September 2 and 3, 2003, Shaw observed the advancement of four cone penetration <br /> test (CPT) borings (CPT-1 through CPT-4). The CPT borings were advanced to a total <br /> I <br /> N:IsacDPl2004 Ppt88018800ao1a.aad.doc Shaw Environmental,Inc. <br />