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Western Lift - 2 - April 2012 <br /> • Groundwater Flow Direction: Predominately to the northeast with an average gradient of <br /> 0.0027 feet/foot (ft/ft) in September 2011. <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 /> (Sep 2011 <br /> MW-6 Mar 98 20-45 23.90 <br /> MW-7 Mar 98 20-45 23.58 <br /> MW-813 Mar 98 21-46 23.87 <br /> MW-9 Mar 98 20-45 23.58 <br /> MW-10 Mar 98 20-45 24.03 <br /> MW-11 Mar 98 20-45 23.68 <br /> Petroleum H drocarbon Constituent Concentration <br /> Contaminant Soil (mg/kg) Water u /L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> (Sep 2011 <br /> TPH9 NA NA 318,000 6,300 5 <br /> Benzene NA NA 22,500 290 0.15 <br /> Toluene NA NA 25,900 340 42 <br /> Eth (benzene NA NA 5,940 180 29 <br /> Xylenes NA NA 33,500 550 17 <br /> MTBE NA NA 3.8 NA 5 <br /> TBA NA NA NA NA 12/1,200 <br /> 1,2-DCA NA NA 1 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 /> a According to GeoTracker,wells <br /> b California Department of Public Health Notification Level/Response Level <br /> Site Description <br /> The Site is located at 3430 South EI Dorado Street in Stockton, California and is an active wood <br /> products manufacturer. The Site is bounded by EI Dorado Street to the west, commercial <br /> properties to the north and south and McKinley Avenue to the east. The surrounding land use is <br /> commercial. <br /> Site History/Assessments <br /> In June 1991, soil contamination was identified during the removal of USTs. To date, six active <br /> monitoring wells have been installed and monitored regularly. A Site map showing the location <br /> of the former USTs, monitoring wells and groundwater level contours is provided at the end of <br /> this five year summary. <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case. <br /> • Soil Excavation: Approximately 2,500 cubic yards of impacted soil were removed and <br /> disposed offsite in 1991 <br />