SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Den's Auto Repair - 2 - April 2012 0 Maximum Groundwater Depth: 29.86 feet bgs at monitoring well MW-3A Groundwater Flow Direction: Variable, southeast with an average gradient of 0.004 feet/foot (ft/ft) in August 2011. • Soil Types: The Site is underlain by interbedded and intermixed gravel, sand, silt and clay Monitoring Well Information Well Designation Date Installed Screen Interval Depth to Water (feet bgs) (feet bgs) May 2011 MW-1a Sep 97 60-65 21.39 MW-lb ..Sep 97 25-45 21.40 MW-2a Sep 97 60-65 21.81 MW-2b Sep 97 25-45 21.58 MW-3a Sep 97 60-65 22.65 MW-3b Sep 97 20-40 22.60 MW-4 Feb 06 110-120 21.98 MW-5 Feb 06 60-65 21.42 MW-6 Feb 06 60-65 22.22 MW-7 Feb 06 110-120 21.93 MW-8 Oct 2010 108-118 21.75 MW-9 Oct 2010 60-65 21.00 MW-10 Oct 2010 60-65 21.68 Petroleum H drocarbon Constituent Concentration Contaminant Soil (mg/kg) Water u /L WQOs Maximum Latest Maximum Latest (ug/L) a (Aug2011 TPHg 1,500 NA 36,000 12,000 5 Benzene 1.6 NA 8,400 330 0.15 Toluene 3.5 NA 54 11 42 Eth (benzene 27 NA 350 29 29 Xylenes 590 NA 197 67 17 MTBE <0.15 NA 39 <1 5 TBA <0.5 NA NA <10 12/1,200 1,2-DCA I <0.1 NA 42 6.2 0.5 NA: Not Analyzed, Not Applicable or Data Not Available mg/kg: milligrams per kilogram, parts per million ug/L: micrograms per liter, parts per billion WQOs. Water Quality Objectives a According to GeoTracker,wells b California Department of Public Health Notification Level/Response Level Site Description The Site is located at 308 South EI Dorado Street in Stockton, California and is an auto service business. The Site is bounded by South EI Dorado Street to the west, East Lafayette Street to the north, a business to the east and a vacant lot to the south. The surrounding land use is mixed residential and commercial.