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31 July 1996 <br /> AGE-NC Project No 95-0105 <br /> Page 2 of 6 <br /> and sealed with tape The samples were properly labeled, stored in a chilled container and <br /> transported under chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco, California <br /> Each sample was analyzed for total petroleum hydrocarbons quantified as gasoline and diesel (TPH- <br /> g and TPH-d), volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) and <br /> methyl-tert-butyl ether (MTBE) in accordance with EPA methods 5030/8015m, 602 and 602, <br /> ' respectively " <br /> During drilling, auger returns were monitored for the presence of organic vapors using a photo- <br /> ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Auger <br /> returns were then placed on plastic sheeting and stored on-site pending laboratory analysis <br /> 22 LOGGING <br /> Soil was extruded from the second brass sleeve and screened for the presence of organic vapors, <br /> using a PID, and the readings were recorded on the boring logs The soil was then described in _ <br /> accordance with the Unified Soil Classification System and logged (see Boring Logs, Appendix A) <br /> 23 WELL COMPLETION <br /> MW-5 and MW-6 were completed as 2-inch diameter ground water monitonng wells using schedule <br /> ' 40 PVC casing with 0 02-inch slotted screen from 3 to 13 feet bsg The filter pack #2 Lonestar sand, <br /> was installed from 2 to 15 feet Bentonite'chips were used to make a one foot plug and the <br /> remaining'annular space was backfilled to the surface with Portland cement <br /> ' MW-4 was a completed p s a 4- <br /> inch diameter ground water wells using,PVC casing with 0 02-inch <br /> ' slotted screen from 3 to 10 feet bsg A filter pack(#2 lonestar sand) was installed from 2 to 10 feet <br /> Bentonite chips were used to make a one-foot plug and the remaining annular space was backfilled <br /> to the surface with Portland cement <br /> A traffic-rated well box (8- or 12-in6h diameter) was installed over each well, in accordance with <br /> County regulations <br /> 24 MONITORING WELL PURGE PROCEDURES <br /> ' On 17 June 1996, the water level in each monitoring well was measured relative to the top of its <br /> casing using a Solinst water level meter The depths to ground water and relative ground water <br />