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AWN <br /> Gasco . 2 - October 31 , 2011 <br /> • Groundwater Flow Direction : Easterly with an average gradient of 0. 00095 feet/foot. <br /> • Soil Types : The Site is underlain by interbedded and intermixed sand , silt and clay <br /> Monitoring Well Information <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> (Apr 2011 ) <br /> MW-1 Jan 90 ?-49 28 . 31 <br /> MW-3 Jan 90 10-47 28 . 74 <br /> MW-4 Apr 92 45-65 28.48 <br /> MW-5 Apr 92 45-65 29. 03 <br /> MW-7 Aug93 45-65 28 . 15 <br /> MW-8 Aug93 45-65 28 . 23 <br /> MW-9 Sep 94 45-65 27 . 98 <br /> MW- 10 Sep 94 45-65 27 . 79 <br /> MW- 11 Sep 94 45-65 28 . 22 <br /> MW- 12 Jul 99 29-59 29 . 81 <br /> MWA 3 Feb 01 25-45 28 . 27 <br /> MW-14 Jul 05 30-50 27 . 88 <br /> MW-16 Jul 05 30-50 <br /> MW- 17b Oct 06 125-135 28. 36 <br /> MW- 18c Oct 06 145-160 28 .40 <br /> Petroleum H drocarbon Constituent Concentration <br /> Contaminant Soil (mg/kg) Water (ug/L) WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> * (Apr 2011 <br /> TPHg NA NA 91 , 300 40 , 000 5 <br /> Benzene NA NA 27, 000 41600 1 <br /> Toluene NA NA 13, 800 3 ,200 150 <br /> Eth (benzene NA NA 31330 1 ,600 300 <br /> Xylenes NA NA 1 12, 600 1 31400 1 11750 <br /> MTBE NA NA 1 , 200 30 5 <br /> TBA NA NA 23400 25 12l1 , 200a <br /> 172-DCA NA NA 29 2. 2 0. 5 <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> mg/kg : milligrams per kilogram , parts per million <br /> ug/L: micrograms per liter, parts per billion <br /> WQOs: Water Quality Objectives <br /> According to GeoTracker, wells <br /> a California Department of Public Health Notification Level/ Response Level <br />