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R604 :UPDATE 9-MARCH, 1992 custody delivered to MATRIX Laboratories (DHS-359 ) , formerly Chemtech Analytical Laboratories, for analysis of Total Petroleum Hydrocarbons and BTEX. If field screening indicates the absence of contamination, the 30 foot sample (historic depth of highest contamination) and the 40 foot sample (termination of boring) will be sealed, preserved, and chain of custody delivered to MATRIX Laboratories (DHS-359 ) , formerly Chemtech Analytical Laboratories, for analysis of Total Petroleum Hydrocarbons and BTEX. The P3A, P3B, P3C and P3D wells confirmed the lateral limits and/or removal of hydrocarbons from the P3 pump island excavated area. During the sample borings, if field screening indicates that these samples are below detection limits, the vadose vapor recovery wells will then be destroyed. WEGE anticipates the samples of these boring will be below the detection limits. If this proves to be true WEGE will consider the soil remediation for this site successful in removing the contaminants from the surface to the 40 foot depth and requests that the soil remediation portion for the site be granted closure, so the land owner can proceed with the needed improvements to lease out this property. The ground water investigation and remediation will continue. If field screening indicates that contamination stall exists in the soil, these borings will be cased and developed into vapor extraction wells at that time. • WELL CONSTRUCTION Previous work at the site has shown that the borings to the 40 foot depth will be in a sandy, clayey salt to salty sand. Once the boring is completed to the 40 foot depth a one to two foot sand base will be poured (clean #3 monteray sand) through the hollow stem augers. Then 2 inch Schedule 40 F480 TriLock PVC casing will be installed with a 2" bottom plug and 5 feet of 0 . 02" slot at the bottom with the remainder made up of 2" PVC Schedule 40 F480 TriLock pipe to approximately 2 feet above the surface. Once the casing has been installed clean #3 monteray sand will be slowly poured into the annular space between the augers and the PVC casing, as the augers are staged out of the hole, to guarantee a sand envelope to the 15 foot depth. A neat cement seal will be placed at this time and will consist of neat cement ( 12 sack mixture with 5% bentonite) . The neat cement seal will be placed by gravity pour from the 15 foot depth to just above the existing ground elevation. The well head will be fitted with a 2" PVC "T" with air tight locking cap at the top and a sample port with pipe to hose fitting at the lateral . This well head will be glued to the casing using PVC cement. page 12