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"' {1 Ms Lori Duncan <br /> a Page 3 of 4 <br /> 2 5 Groundwater Sampling <br /> Groundwater samples were collected from each well after physical parameters had stabilized and the water <br /> in the well had recovered to at least 80% of pre-purge levels Samples were placed in an ice chest at a <br /> temperature of 4° Centigrade and submitted to Argon Laboratory under chain of custody protocol <br /> The samples from newly installed wells MW5, MW6, and MW7 were analyzed for the presence of TPHg, <br /> TPHd, TRPH, and VOCs, including oxygenated gasoline additives, using appropriate analytical methods <br /> The samples from wells MW1, MW2, and MW4 were analyzed for the presence of VOCs pursuant to the <br /> existing groundwater monitoring and sampling program Field development/purge logs are included in <br /> Attachment B <br /> 3 0 GROUNDWATER ANALYTICAL RESULTS <br /> All groundwater samples were analyzed for VOCs and oxygenated gasoline additives using EPA method <br /> 8260B In addition, the newly installed wells were analyzed for TPHg and TPHd using EPA Method 801513, <br /> BTEX using EPA Method 802113, and TRP14 using EPA Method 418 1 No sample was collected from well <br /> MW3 due to the presence of free product <br /> No petroleum hydrocarbons or gasoline additives were detected above method detection limits in <br /> groundwater samples collected from any site wells (well MW3 excluded) <br /> Tetrachloroethene (PCE)was detected in all site wells, ranging from 7 9 parts per billion (ppb) in upgradient <br /> well MW5 to 110 ppb in well cross-gradient well MW7 Cis-1,2-dichloroethene (cis-1,2-DCE)ranged from <br /> 0 6 ppb in well MWS to 3 7 ppb in well MW6 Chloroform ranged from 0 7 ppb in well MW7 to 5 8 ppb in <br /> well MW2 Trichloroethene (TCE) was detected in wells MW1, MW6, and MW7 at 0 9 ppb, 1 7 ppb, and <br /> 5 1 ppb, respectively No other VOCs were detected in any site wells Groundwater analytical results are <br /> summarized on Table 3 Attachment C contains laboratory reports and chain of custody documentation <br /> 4 0 WASTE DISPOSAL <br /> On June 12, 2003, American Valley Waste Oil removed and transported approximately 235 gallons of <br /> product/water mixture and purged groundwater that was removed from site wells and temporarily stored on <br /> site The liquid waste was transported off-site for disposal Attachment D contains copies of the waste <br /> manifest and load ticket that document liquid waste disposal <br /> On July 11, 2003, Thorpe Oil removed and transported waste soil generated from recent well drilling <br /> activities to Forward Landfill, Manteca CA for proper disposal A copy of the non-hazardous waste <br /> manifest is included in Attachment D <br /> 5 0 SUMMARY <br /> Groundwater levels and the direction of groundwater flow beneath the site were generally consistent with <br /> • historical measurements An average of 0 38 feet of free product was measured in well MW3 during the <br /> reporting period A passive skimmer was installed in well MW3 on April 28, 2003 to remove free product <br /> G 1GROUNDZEIGABBARDIreporlslQMR1200312QM2003 doc <br />