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I California Fuels 3 - August 30 , 2011 <br /> Petroleum Hydrocarbon Constituent Concentration <br /> Contaminant Soil m /k Water u /L WQOs <br /> Maximum Latest Maximum Latest (ug/L) <br /> " Jun 2011 n <br /> TPHg NA NA 751000 86 , 000 5 <br /> Benzene NA NA 44, 000 5 , 900 0 . 15 <br /> Toluene NA NA 12, 000 41300 42 <br /> Eth (benzene NA NA 41800 1 , 800 29 <br /> Xylenes NA NA 10, 000 63300 17 <br /> MTBE NA NA 110 34 5 <br /> TBA NA NA 96 NA 12/1 ,200a <br /> 112-DCA NA NA 630 86 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 /> ° only MW-1 and MW-7 sampled <br /> Site Description <br /> The Site is located at 3147 EI Dorado Street in Stockton , California , a highly commercialized <br /> area and is comprised of a parking area and several buildings and formerly a truck fueling area. <br /> The Site is bounded by the 1-5 freeway on the west and a railroad switching yard on the east. <br /> Site History/Assessments <br /> The Site is currently used for parking vehicles . In September 1998, fuel hydrocarbons were <br /> detected in soil during the removal of USTs . To date , twenty four monitoring wells have been <br /> installed and have been monitored regularly. A Site map showing the location of the current <br /> USTs, monitoring wells and groundwater level contours is provided at the end of this summary. <br /> Remediation Summary <br /> • Free Product: Free product has been documented in MW-2. Approximately 20 gallons <br /> of free product has been removed since January 2000, none currently noted <br /> • Soil Excavation : An unknown volume of impacted soil was removed and disposed <br /> offsite in 1998 <br /> • In-Situ Soil Remediation : No soil remediation has been conducted <br /> • Groundwater Remediation : No groundwater remediation has been conducted <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by sandy silt and clayey silt. The <br /> depth to groundwater is approximately 22 feet bgs and the groundwater gradient is east <br /> northeast at approximately 0 . 001 feet/foot. <br /> • Estimate of Hydrocarbon Mass in Soil : Prior to remediation , AGE calculated that <br /> approximately 20, 043 pounds of petroleum hydrocarbons remain in site soils . <br />