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Executive Summary <br />On behalf of the Stockton Metropolitan Airport and County of San Joaquin, IT Corporation has <br />' completed an environmental site investigation to evaluate the extent of soil and groundwater <br />impacted by jet fuel and aviation gas at the airport aviation fuel storage area This investigation <br />' included the drilling and sampling of soil and groundwater from two locations using a Geoprobe <br />Direct Penetration Technology ng Two additional borings were abandoned at a depth of 16 feet <br />below ground surface (bgs) due to refusal at the subsurface concrete slab once used to anchor the <br />former underground storage tanks <br />Observations and chemical data collected during the investigation indicate that Set fuel and <br />aviation gas hydrocarbons did impact the soil and groundwater within the fuel storage area The <br />highest concentrations of Total Petroleum Hydrocarbons (TPH)-as-Aviation Gas in soil were <br />detected at 8,000 parts per million (ppm) in the sample collected from 10 feet bgs on the <br />northwest side of the former underground tanks (SB -4) TPH-as-Jet Fuel was also detected in <br />soil at a maximum concentration of 120 ppm <br />Groundwater was encountered beneath the site at a depth of approximately 5 5 feet bgs <br />Groundwater samples from two of the bonngs were submitted for laboratory analysis The <br />highest detection of TPH-as-Aviation Gas was present at a concentration of 18,000 parts per <br />' billion (ppb) from the boring on the northwest side of the former underground tanks (SB -4) <br />From this same boring, TPH-as-Jet Fuel was reported at 8,500 ppb and benzene was detected at <br />710 ppb <br />' Based on the results of ttus investigation, it is recommended that an additional phase of work be <br />performed to further define the extent of soil and groundwater impacted by fuel hydrocarbons <br />is <br />1 sAC/2-22-96/ENG/765436 <br />