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detected in MW1, MW2, MW3, MW4, MW6, and MW7 BEX components were detected in <br /> MW8 JThe highest concentrations of benzene, toluene, and xylenes were detected in MW2 at <br /> concentrations respectively of 25,000 ug/L, 20,000 ug/L, and 21,000 ug/L The highest <br /> concentration of ethylbenzene was in MW3 at 4,400 ug/L Groundwater samples collected from <br /> wells MW4, MW7, and MW8 contained the lowest concentrations of TPHg and/or BTEX <br /> constituents The groundwater samples collected from MW5, MW9, and MW 10 contained no <br /> detectable concentrations of TPI-Ig or BTEX .11 <br /> Groundwater samples collected from wells MW 1 through MW 10 did not contain detectable <br /> concentrations of MTBE by EPA Method 8021 B r <br /> Analytical results of groundwater samples are summarized in Table 2 Laboratory data sheets <br /> and chain-of-custody documentation are contained in Attachment 2 <br /> FILTRATION SYSTEM <br /> In May 2002, a carbon filtration system consisting of two 200-pound high pressure liquid phase <br /> carbon canisters was installed to remove petroleum hydrocarbons from the water in domestic <br /> well DW On December 7, 2004, water samples were collected from the first and second effluent <br /> ports identified as 1 CC Effluent (sample after the first carbon canister) and 2CC Effluent (sample <br /> after the second carbon canister) in the filtration system (Table 3) It appears the filtration system <br /> is effective in removing petroleum products from groundwater extracted by well DW Analytical <br /> results are summarized in Table 2 and analytical data is contained in Attachmentt '(0,j <br /> v <br /> GEOTRACKER DATA UPLOAD <br /> The depth to water data was submitted electronically to the State Water Resources Control Board <br /> (SWRCB) Geotracker database (confirmation number 8985732853) and the laboratory data was <br /> also submitted electronically to the SWRCB Geotracker database (confirmation numbers <br /> 4879220426 and 7285559415) The facility has been assigned a Geotracker global identification <br /> number T0607700046 Documentation of the data submittal is contained in Attachment vm <br /> 3 <br /> CONCLUSIONS <br /> Concentrations from wells MW1 through MW10 remain generally consistent with the results <br /> from the previous sampling event The direction of groundwater flow continues to be variable <br /> across the site, with a general southerly gradient Groundwater elevations have increased since <br /> September 2004 <br /> S 1163931REPQRTS14gr-2444 doc 4 <br />