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In August 2000, JPCA advanced three soil borings B1, MW4, and MW5, the latter two were <br /> completed as monitoring wells. Soil boring BI was advanced to a depth of 115 feet bgs and <br /> MW4 and MW5 were advanced to a depth of 75 feet bgs. Soil and groundwater samples were <br /> collected and analyzed. Site activities were summarized in JPCAs 2n1 Phase II Environmental <br /> ' Assessment Report dated October 25, 2000. <br /> In January 2003, GHH Engineering, Inc. (GHH) advanced three cone penetrometer borings and <br /> ' three soil borings to depths ranging from 104 feet bgs and 122 feet bgs. <br /> In May 2003, GHH advanced four soil borings, MW6a, MW6b, MW7a, and MW7b to the east of <br /> ' the site. These borings were completed as well clusters with MW6a and MW7a advanced to a <br /> depth of approximately 75 feet bgs and MW6b and MW7b advanced to a depth of approximately <br /> 94 feet bgs. GHH also installed well EWl in the southeast portion of the site. Site activities <br /> ' were summarized in GHHs Second Quarter 2003 Groundwater Monitoring Report and <br /> Additional Assessment Report in June 2003. <br /> In January 2004, a geologist from ATC supervised the installation of five spargepoint wells for <br /> the purpose of remediation through ozone injection. Each spargepoint has a shallow and deep <br /> ozone diffuser. The shallow injection wells were drilled to a depth of approximately 74 feet bgs <br /> and the deep injection wells were drilled to a depth of approximately 110 to 110.5 feet bgs. A <br /> report detailing the remediation system installation activities will be submitted under a separate <br /> cover. <br /> ' 2.0 METHODS AND PROCEDURES <br /> ' To evaluate the extent of impacted groundwater at the site, a total of two clusters of three soil <br /> borings, MW9a through MW9c, and MW10a-through MW10c, and two additional borings, <br /> ' MW6c and MW7c were advanced and completed as groundwater monitoring wells at locations <br /> southeast of the site. An additional boring, MW8 was advanced and completed as a groundwater <br /> monitoring well in the vicinity of the former USTs. All field activities were performed in general <br /> ' accordance with GHH Engineering's Additional Assessment Workplan, Jamar Service Center, <br /> 4075 East Main Street, Stockton, California, dated October 2003 and Work Plan Addendum, <br /> dated November 2003. The workplan and addendum were approved by SJEHD on December 12, <br /> 2003. <br /> 2.1 Drilling Activitics <br /> tFrom February 17 to February20 20 <br /> 04, an ATC geologist supervised the advancement of <br /> MW9a to approximately 75 feet bgs, MW9b to approximately 95 feet bgs and MW8 and MW9c <br /> to approximately 110 feet bgs. On February 25, 2004 an ATC geologist supervised the <br /> advancement of one soil boring MW7c to approximately 110 feet bgs. Woodward Drilling, <br /> California License C57 710079, advanced the borings utilizing a hollow stem auger drill rig. <br /> SAEnviromenta1126823-JamarVeportAsum.doe 2 <br /> 1 <br />