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1620 Executive Court <br /> AL HEI,� <br /> ��1 �1 f l M ! �( � l f N f , E I'i rr' e I Sacramento,CA 95864 <br /> ENGINEERING AND ENVIRONMENTAL SERVICES P012. 1 7 Telephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> 9 July 1997 <br /> Mr. Charles Leubner <br /> Stockton Unified School District <br /> 1932 N. El Pinal Drive <br /> Stockton, California 95205 <br /> Subject: Preliminary Site Assessment Proposed Work Plan <br /> for Stagg High School <br /> HLI 00814 <br /> Dear Mr. Leubner: It I <br /> Presented below is our proposed work plan for conducting a&reliminary Site Assessment for <br /> Stagg High School. The assessment will be limited to the three sites where petroleum <br /> hydrocarbons were detected in soil samples collected during t elremoval of two underground fuel <br /> storage tanks from Stagg High School in 1990. These sites include the former locations of a <br /> L <br /> mote fill Iii e for the diesel tank, and .a 500-gallon <br /> 10,000-gallon diesel tank, a section of the re <br /> gasoline tank(see Figure 1). <br /> This work plan includes a review of the previous sampling performed at each of the three sites, a <br /> proposed sampling program to evaluate the extent of hydiDcarbons that remain at each site, and a <br /> schedule for conducting the field investigation and submitting;ithe Preliminary Site Assessment <br /> Report. Soil samples will be collected using a truck-mounted direct penetration probe (Geoprobe). <br /> IF <br /> BACKGROUND AND SAMPLING RATIONALE <br /> ss <br /> Diesel Tank (Tank No. 1) <br /> As part of the removal activities for the 10,000-gallon underground diesel fuel storage tank, five <br /> soil samples were collected from the tank excavation at the locations shown on Figure 2. The <br /> results of that sampling are shown on Table 1. Total Extractable�Tetroleum Hydrocarbons (TEPH) <br /> were detected above method detection limits only in the sample collected from the southeast <br /> comer of the excavation. TEPH was detected at 1,200 ragVKg in this sample which was collected <br /> at a depth of 14 feet below the ground surface. This l6cation was where the remote fill line <br /> connected to the tank. There were no detectable concentrations of benzene, ethylbenzene, toluene, <br /> and xylenes found in any of the samples collected from theexcavation. <br />