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File No. 249947 20 May 1991 Page 5 <br /> 1.4 Purpose <br /> This investigation was designed to do the following: <br /> 1) Bus Maintenance Building. Excavate the areas of the anomalies observed <br /> ' near the former maintenance building during the geophysical survey of the <br /> site. Determine, if possible, the source of the anomalies and observe the ' <br /> subsurface for evidence of contamination. <br /> i2) Bus Garage. Excavate one or more trenches in the vicinity of the former <br /> bus garage and inspect subsurface soils for evidence of contamination. <br /> ' 3) Car Wash. Attempt to excavate one or more of the sand and grease <br /> traps to observe the conditions of the soil beside and under the traps. <br /> ' (Our experience with similar concrete traps and sumps suggests that soil <br /> contamination may exist in the soil surrounding the traps.) <br /> 1.5 Scope <br /> Bus Building Anomalies. The areas of the two anomalies were excavated using a <br /> ' backhoe, and inspected for the presence of tanks. The excavated soil was inspected <br /> for visual and olfactory evidence of contamination. The soil was also screened for <br /> the presence of volatile organic constituents using an H-Nu brand photoionization <br /> ' device (PID). Soil samples were collected from the material excavated. <br /> Throughout this investigation, soil samples were collected in brass tubes by pushing <br /> ' or driviing the tubes into the soil in the backhoe bucket. The tubes were covered <br /> with Teflon tape and placed on ice immediately after collection. Chain of custody <br /> documentation was maintained at all times. Our work will be performed under the <br /> 1 guidelines outlined in the State of California Regional Water Quality Control Board <br /> Leaking Underground Fuel Tank Manual. <br /> ' The samples were analyzed for total petroleum hydrocarbons (EPA Method 8015), <br /> and volatile constituents (EPA Method 8020). The excavation was then backfilled <br /> once our examination was completed. <br /> Bus garage. Two trenches were excavated in the vicinity of the former bus garage. <br /> The excavated soil was inspected for visual and olfactory evidence of contamination, <br /> ' and was screened using a PID for the presence of volatile organic constituents. Soil <br /> samples were collected from the area; select samples were analyzed for total <br /> petroleum hydrocarbons (EPA Method 8015), and volatile constituents (EPA <br /> ' Method 8020). After inspection, the trenches were backfilled. <br /> FNGERGGN <br /> ' GROUP TING <br /> GROUP <br />