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' Bank of Stockton - Cutter Lumber Site Page 7 Groundwater Monitoring Well Construction ' Project No 102 2 April 24, 1998 ' 2.2.2 Groundwater Monitoring At the suggestion of the LOP enforcement officer, the wells were sampled within ' 24 hours of the well development as described above The sampling was performed without additional purging On March 13, 1998 Del-Tech personnel ' returned to the site to collect groundwater samples A stainless steel bailer was used to collect each sample Bailer cleanliness was ' verified by collecting a bailer blank (pouring distilled water through the bailer and collecting it in a VOA vial) prior to collecting the analytical sample Before and in between uses, all sampling equipment was washed using a portable ' steam cleaner Disposable gloves were worn by the sampling technician while collecting all samples The gloves were changed between the collection of each sample to reduce the potential for cross-contamination ' Extreme care was exercised while collecting samples to prevent agitation of the water contained in the bailer Water samples were transferred from the bailer ' into 40 ml VOA vials preserved with hydrochloric acid and 1 liter capacity amber glass bottles (provided by the analytical laboratory) All samples were checked liefor head space bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory The two pre-existing, groundwater monitoring wells, MW-1 and MW-4 were also i monitored and sampled Stagnant water in these wells was purged using a stainless steel bailer belayed with a servo actuated electric reel The rate of well t purging was monitored, and the well was purged of at least three casing volumes until the groundwater parameters (temperature, conductivity, and pH) had stabilized (Appendix C) indicating that water, representative of actual aquifer conditions, was entering the well Groundwater parameter stabilization was characterized by three successive readings within 10 percent After the wells had been allowed to recharge to at least 80 percent of their original volume, samples were collected using the methods described above ' 2.3 Waste Disposal ' During drilling, a total of 34 drums were filled with soil cuttings The drums were labeled and stored on site pending profiling and proper disposal Manley & Sons was contacted to pick-up and dispose of the soil at Forward Inc , a Class II I landfill located in Stockton On March 24, 1998, the soil was properly disposed . of as non-hazardous waste Documents relating to the soil disposal are herein attached as Appendix E ' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293