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M c I l r + I 1 , 24 August 1998 AGE-NC Project No 96-0232 Page 3 of 8 , I the Unified Soil Classification System(USCS) Boring logs are included as Appendix A General lrthology beneath the site in cross sectional view isdepicted on Figures 3 and 4 v 2 2 4 Monitoring Well Completion - Soil borings MW-5 and MW-7 were completed as ground water monitoring wells utilizing 2-inch diameter, schedule 40, blank polyvinylchloride (PVC) casing and 2-inch diameter screened PVC r I casing (0 020-inch slot) Boring MW-6 was completed using two 2-inch diameter,_ schedule 40, blank PVC casings and 2-inch diameter screened PVC casings (0 020-inch slot),and designated as 4 S f MW-6A and MW,-6B ' r I Each well was completed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring The augers were Incrementally raised as #3 Lonestar Lapis 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 placement of the filter pack, a surge block was inserted into the PVC casing and was lowered then raised (surged)repeatedly for approximately 10 minutes Thereafter, the depth to the top of the filter pack was measured and bentonite coded"pellets (pell plug)placed above the filter pack and hydrated with clean tap water to serve as an annular seal Therremalning annular space was sealed with portland type II cement As-built well construction diagrams are included as Figure's 5, 6 and 7 t - _ I 2 2 5 Surveying of Monr'tonng Wells S s 1 ~ ` I ~ y On 15 July 1998, a California licensed survey engineer fromJ Baumbach & Piazza, Inc surveyed'a reference point on�the top of each ground water,monxtormg'well at the site to the nearest`0 01-foot' relative to the San Joaquin County Bench Mark Datum 4 ZAA-13 4 The results of the inonrtonrlg well survey are contained�in,Table 2 The surveying report (Baumbach & Piazza Job No 9797) is v presented iri Appendix B " I F I 1 1 ; t T 1 226 Well Development a r , On 06 July 1998, monitoring wells MW-5 through MW-7 were developed utilizing a two-stage submersible pump Ground water,was purged from ,each well until the water produced was ' essentially sediment free! Approximately 18 to 25 gallons of ground water were purged'from each, screened interval, monitoring well MW-6B produced approximately 14 gallons of ground water prior to being pumped'*y'I' Purged ground water'was containerized in properly labeled D O T - „ - Advanced GeoEnvironmental,Inc