Laserfiche WebLink
enviros® <br /> ® Ground water samples from Wells MW-1, MW-2, RW-1, and VEW-1 <br /> contained 0 81 ppb, 0 76 ppb, 6 3 ppb, and 15 ppb benzene, respectively <br /> The remaining wells were ND for benzene in ground water Halogenated <br /> volatile organics were detected in Wells MW-2, MW-3, MW-4, RW-1, <br /> RW-2, and VEW-3 A benzene concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Wells MW-1 through MW-5, RW-1, RW-2, and VEW-1 through VEW-4 were <br /> sampled and analyzed for Total Purgeable Petroleum Hydrocarbons quantitated as <br /> gasoline (TPPH) according to EPA Method 8015 (Modified),benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) and methyl-tertiary-butyl-ether (MTBE) <br /> according to EPA Method 8020, and halogenated volatile organics (HVOCs) <br /> according to EPA Method 8010 Additionally, a duplicate sample and an equipment <br /> blank were prepared and analyzed for quality control purposes <br /> All four vapor extraction wells contained sufficient water for sampling this quarter <br /> Well VEW-2 had a measured total depth of 22 61 feet below grade (fbg), while its <br /> total depth is approximately 30 fbg Some silting may have occurred in the well <br /> resulting in this difference <br /> Ground water samples from Well MW-2 contained 1 5 ppb cis-1,2-dichloroethene <br /> and 1 6 ppb trichloroethene Well MW-3 contained 0 60 ppb chloroform, 1 9 ppb <br /> cis-l,2-dichloroethene, and 4 7 ppb trichloroethene Well MW-4 contained 2 0 <br /> ppb cis-l,2-dichloroethene and 8 2 ppb trichloroethene Well RW-1 contained 1 2 <br /> ppb cis-l,2-dichloroethene and 6 4 ppb trichloroethene Well RW-2 contained 2 9 <br /> ppb cis-l,2-dichloroethene and 1 9 ppb trichloroethene Well VEW-3 contained <br /> 0 88 ppb chloroform, 17 ppb cis-1,2-dichloroethene, and 7 6 ppb trichloroethene <br /> Wells MW-1, MW-5, VEW-1, VEW-2, and VEW-4 were ND for HVOCs <br /> according to EPA Method 8010 <br /> Field monitoring data and chemical analytical data are summarized in Table 1 <br /> Blaine's quarterly ground water monitoring report is presented in Appendix A <br /> A summary table will be prepared and submitted to SJCPHS for review and <br /> discussion with the RWQCB as to whether a case closure request should be <br /> submitted <br /> 97369 2 <br />