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I 12 March 1999 AGE-NC Project No 95-0121 ,Page 3 of 7 ' Luster sand(filter pack)was slowly poured down the annulus between the well casing and the inner wall of the hollow stem auger The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen, following filter ' - pack placement, a surge block was inserted into the well casing and lowered then raised (surged) repeatedly for approximately 10 minutes Approximately two feet of bentonite pell plug (annular seal)were placed above the filter pack and hydrated with the existing ground water The remaining ' annular space was backfilled with portland cement A typical as-built well-construction diagram for wells AW-I through AW-5 is Included as Figure 4 2 1 5 Surveying Of Soil Vapor Extraction/In-Situ Air Sparge Wells ' On 11 January 1999, a California state-licensed survey engineer from Baumbach & Piazza, Inc surveyed a reference point on the top of SVE wells VW-1 through VW-9 and IAS wells AW-1 ' through AW-5 to the nearest 0 01-foot relative to the City of Stockton Bench Mark Datum 4 COS 186 The results of the monitoring well survey are contained in,Table 2 The surveying report (Baumbach& Piazza Job No 9797) is presented in Appendix B 2 16 Well Development ' On 09 November 1998, IAS wells AW-1 through AW-5 were developed utilizing a hand bailer and two-stage submersible pump Prior to well development activities, depths to ground water and total well depths were measured to the nearest,0 01-foot utilizing a Solinst water level meter Approximately 15 gallons of ground water were purged from IAS wells AW-3, AW-4 and AW-5, ' approximately 10 gallons of ground water were purged from AW-I and AW-2 before being pumped dry Ground water was purged from each well until the water produced was visually sediment free Purged ground water was containerized in properly labeled D O T -approved model,17H 55-gallon ' drums and was stored on-site in an area lacking public access IAS field logs for development activities are included with Appendix C 1 22 ' UNDERGROUND REMEDIATION PIPING SYSTEM INSTALLATION ' Between 19 November and 11 December 1998, the IAS piping system and the SVE piping system were installed at the site in 6-inch wide by,18-inch deep trenching The IAS piping system utilized ' schedule 80, 1-Inch diameter PVC piping from each IAS well head to the IAS system fencing enclosure The SVE piping system utilized schedule 80, 2-Inch diameter PVC piping from each SVE well head to the SVE system fencing enclosure A 2-inch diameter PVC ball valve was installed at Advanced GcoEnvironmental,Inc