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$ NEW, <br /> -- + � -c' 5 <br /> .f <br /> _f <br /> .y <br /> 4 <br /> 3 <br /> 1 ' <br /> fiF <br /> PROBLEM ASSESSMENT REPORT <br /> Moore Petroleum, Inc. <br /> 14800 W. Frontage Road, Manteca, CA <br /> Nr.A Project Ne. 10-90-479 <br /> Page 6 <br /> 3.3 Installation of Below-Ground Components of a Boil Venting <br /> B stem <br /> On November 22, 1989, USTs at the site were removed. On that <br /> date, a Delta representative, with the concurrence of <br /> representatives of the San Joaquin Public Health Services, <br /> collected soil samples of native soils beneath each end of the USTs <br /> and at 20 foot intervals beneath fuel product lines. Visual <br /> observation of native soils beneath the removed USTs, native soils <br /> along fuel product lines, and tank basin backfill material, <br /> indicated that the results of the soil analyses would likely <br /> indicate appreciable levels of petroleum hydrocarbons remaining in <br /> site soils. In order to provide a future soil remediation <br /> alternative (if needed) , and to facilitate the installation of new <br /> USTs within the same tank basin, the below ground components of a <br /> soil venting system were installed on November 27 and 28, and . <br /> December 14, 1989. <br /> Below-ground components of the soil venting system within the tank <br /> basin consist of two 25-foot lbng sections of 4-inch-diameter PVC <br /> well screen (0.020 inch Slot. size) wrapped in filter fabric and <br /> placed horizontally at a depth of about 17 <br /> feet. The ns of <br /> well screen are manifolded together and brought to 2 sfeet ectiobelow <br /> grade with sections of 4-inch-diameter PVC blank casing. <br /> Soil venting system components beneath fuel product lines. consist <br /> -, of two 25--foot long sections. of 4-inch-diameter PVC well screen <br /> �., (0.20 inch slot size) wrapped in filter fabric and placed <br /> horizontally at a depth of about 10 feet. Each section of well <br /> screen is connected to an 8-foot long, 4-inch-diameter, PVC blank <br /> casing riser pipe located at the Southeast and southwest ends of <br /> the tank basin, riser pipes are connected by 25-foot sections of <br /> blank casing placed horizontally in a North-South direction about <br /> two feet below grade within the tank basin. These sections of <br /> horizontal blank casing are manifolded together at the North end <br /> of the tank basin. <br /> Blank casing sections from both the tank basin and product line <br /> portions of the soil venting system are conveyed by means of a <br /> shallow trench to a position North of the USTs. Short riser pipes <br /> connect each portion of the system to the surface. A plan and <br /> -- cross-sectional view of the below-ground components of the soil <br /> venting system is presented as Figure 3. <br /> J <br />