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31 August 2000 <br /> AGE-NC Project No 00-0725 <br /> Page 2 of 9 <br /> Table 1 summarizes the analytical data of the soil samples analyzed <br /> TPH-g was detected In all grab ground water samples at concentrations ranging from 370 µg/l <br /> (sample B1-H2O) to 55,000 gg/1 (sample 133-H2O) Benzene was detected in four of five grab <br /> ground water samples at concentrations ranging from 0 54 µg/1 in (sample B 1-H2O) to 160 dug/1 <br /> (sample B3-H20) Toluene, ethyl benzene and xylenes were detected in grab ground water samples <br /> at concentrations ranging from 1 9 µg/l (xylenes, sample B4-H20)to 25 �Ig/1 (xylenes, sample B2- <br /> H20) MTBE was not detected in any of the ground water samples, by EPA Method 8020 Fuel <br /> oxygenating compounds,by EPA Method 8260,were not detected in sample 133-1­1201 other samples <br /> were not analyzed using EPA Method 8260 Table 2 summarizes the analytical data of the `grab' <br /> water samples analyzed <br /> 2 3 GROUND WATER DEPTH AND FLOW DIRECTION <br /> The estimated depth to ground water at the property is approximately 10 feet below surface grade <br /> (bsg), based on the map titled Lines of Equal Depth to Groundwater Sprang 1996 published by the <br /> • San Joaquin County Flood Control District and Water Conservation District(FCD&WCD) Based <br /> upon a previous site investigation performed by AGE, ground water depth ranged between 10 and <br /> 12 feet bsg <br /> It is Inferred from the map titled Lines of Equal Elevation of Groundwater- Sprang 1996, also <br /> published by the FCD&WCD, that ground water flows toward the northwest in the general area of <br /> the site but this may be modified by changing recharge and discharge patterns Ground water is <br /> considered to be of beneficial use and Is used for domestic, industrial and commercial purposes <br /> 3.0. SCOPE OF WORK <br /> Based on the laboratory analysis of soil samples collected and field observations noted during the soil <br /> boring advancement, the hydrocarbon-Impacted soil was encountered in the former dispenser area <br /> Hydrocarbon-impacted ground water was encountered in the inferred down-gradient direction from <br /> the former UST system The proposed interim soil remediation scope of work will include the <br /> following tasks <br /> • Planning and pre-field work activities <br /> • Soil excavation and sample collection/analysis <br /> • Excavation backfilling <br /> • • Soil disposal <br /> Advanced CeoEnvironmental,Inc <br />