Laserfiche WebLink
' We placed the extracted groundwater into Department of Transportation-approved, 17-H, 55-gallon <br /> ' drums that were temporarily stored onsite pending disposal. On February 15, 2009, March 4, 2009, <br /> March 19, 2009, and April 1, 2009, KR Environmental either picked up or used a vacuum truck to <br /> purge the 55-gallon drums and transported the purge water to their disposal facility located in <br /> ' Sacramento, California. <br /> ' 2.5 Summary of OS Pilot Testing Results <br /> The effectiveness of the OS was evaluated by measuring the DO and contaminant concentrations in <br /> select monitoring wells with the expected response being increases in the DO and decreases in the <br /> contaminant concentrations with time. <br /> 2.5.1 Source Area Well Results <br /> The baseline, 30-day, 60-day and 90-day TPHg, benzene, naphthalene and DO results for the source <br /> area wells are summarized below. <br /> Well No. Date TPHg Benzene Naphthalene DO <br /> (µg/1) WWI) <br /> MW-1 11/10/08 10,000 740 220 0.18 <br /> (source area well) 3/9/09 9,600 580 170 0.17 <br /> Screened from 50'-75' 4/15/09 8,500 690 180 0.29 <br /> 5/11/09 12,000 750 160 0.27 <br /> ' MW-3 11/10/08 4,800 1 0.68 6.9 0.26 <br /> source area well 3/9/09 1,200 9.2 2.6 0.13 <br /> ' Screened from 50'-75' 4/15/09 1,900 2.8 2.9 0.16 <br /> 5/11/09 1,700 1.8 3.2 0.15 <br /> ' GWX-1 11/10/08 19,000 7,900 340 0.29 <br /> source area well) 3/9/09 9,000 1,200 120 0.11 <br /> Screened from 24'-62' 4/15/09 2,800 300 49 0.16 <br /> 5/11/09 4,300 1 240 58 0.20 <br /> ppm=parts per million <br /> ' Well GWX-1 showed the greatest decreases in contaminant concentrations of the three source area <br /> wells. The 90-day sampling results for GWX-1 reported TPHg, BTEX and naphthalene concentrations <br /> ' at least one order of magnitude less than their respective baseline concentrations. The results for wells <br /> MW-1 and MW-3 were less conclusive. While MW-3 showed decreased TPHg and naphthalene <br /> ' concentrations, the BTEX concentrations increased slightly at the 30-day sampling event. The <br /> subsequent 60-day and 90-day sampling of MW-3 showed that while BTEX concentrations remained <br /> above baseline levels, the overall trend for BTEX is decreasing following the 30-day results. With the <br /> Project No.S9183-06-02 -6- July 2,2009 <br />