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I15 January 2001 `S AGE-NC Project No 96-0232 Page 5 of 20 On 13 October 2000, ground water extraction wells EW-4, EW-5, EW-6, EW-7 and EW-8 were developed utilizing a stainless steel hand bailer, EW-9 and EW-10 were developed on 18 October 2000 Approximately 150 to 200 gallons of ground water were purged from each well or until ground I water produced was visually sediment free Purged ground water was placed in properly labeled DOT-approved model 17H 55-gallon drums and was stored in a northeast section at the site In an area lacking public access Field logs for extraction well development activities are included In Appendix D I4.0. INSTALLATION OF GROUND WATER EXTRACTION PUMPS I On 26, 27, 30 and 31 October 2000, Clark Well, Inc of Stockton, California installed 4-inch diameter, stainless steel model 5510 Grundfos Rediflow down-well pumps equipped with 230 volt Franklin 1-horsepower 3-wire motors In ground water extraction wells EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, EW-9 and EW-10 Each Grundfos pump was internally equipped with a one-way check valve to prevent back-flow The Grundfos pumps were installed in each well at a depth of approximately 31 feet below surface grade (bsg) Schedule 80, 1-inch diameter poly vinyl chloride I (PVC)piping was routed from the pump to the top of the well casing and through a 4-inch diameter sanitary well seal At surface grade, a brass flow valve and liquid-filled pressure gauge were installed at the outlet of the well head to control and monitor the extraction flow rate A copper sampling port I was installed upstream of the brass flow valve to allow sampling of each well independently without having to remove the well head assembly A generalized diagram of the pump and well design is presented in Figures 3, 4, 5, 6, 7, 8, 9 and 10 I 5.0. INSTALLATION OF GROUND WATER PUMP AND TREAT SYSTEM Between 18 October and 10 November 2000, AGE installed an on-site ground water pump and treat system, ground water pump and treat installation procedures for the site were outlined in Final I Remediaion Plan, dated 31 August 2000, prepared by AGE and approved by the RWQCB by letter dated 05 October 2000 5 1 TRENCH SYSTEM INSTALLATION IOn 18, 19 and 20 October 2000, preparation of an on-site ground water extraction pipe-line commenced by saw-cutting a trench-line measuring approximately 18 inches wide, 8 inches thick and 250 feet long of concrete block Concrete cuttings were transported to F T G Construction Materials Inc , a concrete recycling facility located in Stockton CA I i Advanced GeoEnviroamental,Inc I