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i 1 21 November 2001 AGE-IVC Project No 00-0769 - Page 2 of 5 i 13 September 2001 Field procedures were performed in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) guidelines for subsurface investigations of underground storage tank (UST) sites and sampling ground water monitoring wells I 3 1 PURGE WATER DISPOSAL � r On 04 June 2001, approximately 550 gallons of non-hazardous purge water was pumped from on- site 55-gallon drums The purge water had been generated during previous ground water monitoring events -Pumping and disposal was completed by American Valley Waste Oil, Inc of Delhi, California The purge water was disposed at Seaport Environmental located in Redwood City, California A copy of the waste disposal manifest is included in Appendix A i3 2 MONITORING WELL PURGE PROCEDURES lie On 29 June 2001 and 13 September 2001, the deptli to ground water was measured from the top of each well casing to the nearest 0 01-foot utilizing a Sohnst water level meter Ground water elevations in each well were calculated by subtracting the measured depth to ground water from surveyed casing elevations (Table 1) During the September 2001 monitoring event, a two-stage pump was used to purge wells MW-2A and MW-2B of standing water following depth to water measurments,new disposable plastic bailers were used to purge wells MW-1 and MW-213 A parked vehicle prevented purging and sampling MW-3B Approxunately 6 to 48 gallons of water (a minimum of 3 casing-water volumes) were removed from each sampled well Ground water temperature, pH and conductivity were measured at regular intervals during purging using an ICM water analyzer Field sheets and data from the June and September 2001 monitoring events are'included in Appendices B and C, respectively Purged water was stored on-site in labeled, 55-gallon DOT-approved drums I3 3 , COLLECTION OF GROUND WATER SAMPLES! Water samples were collected from each purged well using new disposable plastic bailers Each water sample was transferred into three 40-inl VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly labeled, placed in a chilled I container and transported under chairs-of-custody to McCampbell Analytical,Inc (MAI)for analysis The samples were analyzed for the following 0 I Advanced GeoEnvironmcntai,Inc I