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09 April 2002 <br /> • AGE-NC Project No 98-0497 <br /> 1 Page 4 of 6 <br /> 1 Fuel oxygenates - MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 Modified <br /> 32 LOGGING <br />' Soil was extruded from a second brass sleeve and was screened for the presence of organic vapor <br /> 1 using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene), and the OVM readings were recorded on <br /> the boring log The soil was then visually described in accordance with the Unified Soil <br /> 1 Classification System (see Appendix B) <br /> ' 3 3 WELL AND BORING COMPLETION <br /> Soil borings MW-4 and MW-5 were completed as ground water monitoring wells using two-inch <br /> lie diameter PVC casing with 0 020-inch slotted screen installed from approximately 58 feet to78 feet <br /> bsg Blank well casing was installed from approximately 58 feet bsg to near surface The filter pack <br /> (No 2112 Lonestar sand)was installed from 78 feet to approximately 56 feet bsg A nominal 5-foot <br /> 1 bentonite chip plug was then installed above the filter packs and hydrated The wells were then <br /> grouted to near the surface with portland cement Water-tight,traffic-rated well boxes were installed <br /> over each well As built well diagrams are depicted on the boring logs in Appendix B <br /> 3 4 MONITORING WELL DEVELOPMENT ACTIVITIES <br /> On 18 February 2002 monitoring wells MW-4 and MW-5 were developed utilizing a stainless steel <br /> hand bailer and anew,disposable plastic bailer Groundwater was purged from each monitoring well <br /> until groundwater was visually sediment free,approximately 25 gallons ofwater were removed from <br /> MW-4 and 20 gallons of water were removed from MW-5 Purged ground water was containerized <br /> ' in properly labeled DOT-approved 55-gallon drums and was stored on-site Field sheets and data are <br /> included in Appendix C <br /> ' 35 WELL HEAD-SURVEY - - <br /> On 04 March 2002, a California state-licensed survey engineer from Baumbach & Piazza, Inc <br /> • surveyed the elevation of a reference point on the top of the casings of ground water monitoring <br /> wells MW-4 and MW-5 to the nearest 0 01-foot relative to City of Stockton Bench Mark Datum <br /> Advanced GeoEnvironmental,Inc <br />