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204 Lodi Ave. Chronology <br /> Page 2 <br /> 7194 The "Final Remediation Plan" for soil vapor extraction and air <br /> sparging was completed. <br /> 5117-19195 SW1 & SW2 were installed about 25' northeast and southwest of <br /> the former UST location, with screened intervals of 68.5'-73.5' & <br /> 70'-75' below surface. <br /> 7195 Soil vapor extraction/air sparge system were installed using MW1 & <br /> RW1 for vapor extraction and SW1 & SW2 for air sparging. <br /> 8195 The remediation system was started. <br /> 3113196 B9 & B10 were drilled to investigate the areaq of remediation. B10 <br /> had contamination at 45'. <br /> 7131/96 Soil probes P1 , P2, P3 with soil samples collected. P1 was located <br /> in the tank pit and evidenced soil contamination at 40' below <br /> surface. P2 was located about 10' north of the former UST location <br /> and evidenced soil contamination to 50' below surface. P3 was <br /> located about 10' west of the former UST location and evidenced <br /> low level contamination at 40' and 50' below surface, but was ND <br /> at 55' below surface. <br /> 2126197 Soil probes P4 &P5 with soil samples collected. P4 was located <br /> about 20' northeast of the former UST location and evidenced low <br /> level contamination at 15' and 20' below surface, and was ND at <br /> 25' and 45' below surface. P5 was located about 5' north of the <br /> former UST location and evidenced contamination to 50' below <br /> surface, but was ND at 55' below surface. <br /> 515197 Closure report completed. Significant reduction in groundwater <br /> contamination. All wells were ND except MW1 which had 51 ppb of <br /> TPH-g and .54 ppb Xylene. It is no longer cost effective to <br /> continue remediation. <br /> 10/15/97 Quarterly report for July 1997. All wells ND for BTEX & TPH-g <br /> except MW1 with 190 ppb TPH-g, .35 ppb Benzene, .33 ppb <br /> Toluene, 2.5 ppb Ethyl-benzene, 6.2 ppb Xylene. Oxygenates and <br /> volatile organic compounds analyzed for using EPA methods <br /> 8015m and 8260. Only DCA over MCL or action level for <br />