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Protect No 034-97252 <br /> Page No 3 <br /> TABLE I <br /> Concentrations of Petroleum Hydrocarbons and Volatile Organics <br /> Constituents in Groundwater <br /> H&H Engineering Property <br /> 212 Industrial Drive <br /> Stockton, California <br /> March 6, 1998 Sampling <br /> (Concentrations expressed in micrograms per liter, gg/L) <br /> Volatile <br /> Sample ID Benzene Toluene Ethyl Benzene Total Xylenes TPH-G Organics* <br /> P5-W 610 250 48 68 11,000 ND <br /> MCL 1 150 700 1,750 NA NA <br /> Reporting 05 0 5 05 15 500 Varies <br /> Limits <br /> NA = Not applicable <br /> ND — None detected at the reporting limit noted <br /> TPH-G = Total petroleum hydrocarbons as gasoline by EPA Method 8015M <br /> MCL = State of California Maximum Contaminant Level in drinking water <br /> * = Analyte list includes MTBE, TCE, etc Please see attached analytical report for specific <br /> analytes and reporting limits <br /> CONCLUSIONS <br /> Based on the results of this and prior investigations at the site, the following observations and <br /> conclusions can be trade <br /> • Elevated concentrations of petroleum hydrocarbons (including benzene and toluene above <br /> their respective State Maximum Contaminant Levels, MCL) are present in groundwater <br /> beneath the area of the former on-site UST <br /> • No concentrations of fuel oxygenates or chlorinated hydrocarbons were detected in <br /> groundwater <br /> • The soil profile beneath the former UST area is comprised of lower permeability material <br /> (clays and clayey silts) <br /> • The source of the hydrocarbon release was removed in 1987, and the former UST site is <br /> capped with impermeable material (asphaltic concrete) <br /> • Discussions with regulatory agencies have indicated that groundwater levels to San <br />• Joaquin County are currently near historic highs due the heavy rainfall during this year <br /> KRAZAN&ASSOCIATES,INC <br /> Offices Serving the Western United States <br /> 3497252 GW 1 <br />