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Manna Pro Corp. - 2 - August 16, 2011 - <br /> • Groundwater Flow Direction: Predominately to the north northeast with an average <br /> gradient of 0.0012 feet/foot <br /> • Soil Types: The Site is underlain by interbedded and intermixed sand, silt and clay <br /> Monitoring Welllnformation <br /> Well Designation Date Installed Screen Interval Depth to Water <br /> (feet bgs) (feet bgs) <br /> Mar 2011 <br /> MW-1 Oct 91 41-51 23.18 <br /> MW-2 Oct 91 41-51 23.35 <br /> MW-3 Oct 91 41-51 24.06 <br /> MW-4 Oct 91 40-49 23.83 <br /> MW-5 Oct 91 30-50 25.00 <br /> MW-6 Oct 91 30-50 23.87 <br /> MW-7 Feb 93 30-42 - <br /> MW-8 Feb 93 30-42 23.66 <br /> MW-9 Feb 93 30-42 23.70 <br /> MW-10 Feb 93 30-42 . 23.66 <br /> Petroleum H drocarbon Constituent Concentration <br /> Contaminant Soil (mg/kg) Water (ug/L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> * Mar 2011 <br /> TPHg NA NA 170,000 20,000 5 <br /> Benzene NA NA 42,000 3,700 0.15 <br /> Toluene NA NA 51,000 1,200 42 <br /> Eth (benzene NA NA 3,200 1,000 29 <br /> Xylenes NA NA 18,000 2,800 17 <br /> MTBE NA NA NA NA 5 <br /> TBA NA NA NA NA 12/1,200a <br /> 1,2-DCA NA I NA NA L NA 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 /> Site Description <br /> The Site is located at 4004 South EI Dorado Street in Stockton, California and is currently <br /> operated as a lumber yard. The Site is bounded by El Dorado Street to the west, businesses to <br /> the north and south and South McKinley Avenue to the east. The surrounding land use is <br /> commercial. <br /> Site History/Assessments <br /> In July 1990, soil contamination was identified during the removal of USTs. To date, ten <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the limits of the 1990 excavation, monitoring wells and site facilities is provided at the end of <br /> this five year summary. <br />