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24 August 1998 <br /> AGE-NC Project No 96-0232 _ <br /> Page 4 of 8 <br /> ` x x <br /> Eapproved model 17H 55-gallon drums and was stored on-site in an area lacking public access 3 <br /> t <br /> t <br /> 2 3 QUARTERLY MONITORING AND SAMPLING ACTIVITIES <br /> On 06 July 1998, quarterly ground water monitoring and sampling was performed Ground water <br /> depths and total well depths were measured in wells MW-I through MW-7 to the nearest 0 01-foot <br /> utilizing a Solinst water level meter Relative ground water elevations were calculated by subtracting <br /> the depth to ground water from the surveyed casing elevations (Table 2) Ground water elevations <br /> were plotted and contoured on a scaled site map (Figure 8) <br /> „ t <br /> After water levels were measured, a minimum of three well volumes of ground water were purged <br /> from wells MW-1 through MW-7 by hand bailing and using a two-stage submersible pump Ground <br /> water stabilization parameters,including temperature,pH and conductivity,were measured at regular <br /> ' purge volume intervals utilizing an ICM model 52200 water analyzer Stabilization data and field <br /> logs are contained in Appendix C Purged ground water was stored in 55-gallon drums on-site in an <br /> area lacking public access <br /> The ground water levels from monitoring wells MW-1 through MW-7 achieved a minimum of 80 <br /> percent recharge prior to sample collection Ground water samples were collected utilizing <br /> disposable polyethylene bailers Upon retrieval,each sample was transferred to EPA-approved 40-m1 <br /> VOA vials, containing 0 5 ml 18% hydrochloric acid as a sample preservative, and 1-liter amber <br /> bottles Care was taken to ensure that visible air bubbles were not present in the VOAs after filling <br /> and"capping Ground water sample containers were labeled with the well designation,date,time,and ` <br /> sampler's initials <br /> Following collection, each sample was logged on a chain-of-custody form, placed in a chilled <br /> 11 <br /> container and transported to a DTSC-certified Iaboratoryfor the following analysis <br /> • <br /> TPH-g and TPH-d in accordance with EPA Method 8015M, <br /> • BTEX and MTBE in accordance with EPA Method 602; and <br /> • Fuel oxygenates in accordance with EPA Method 8260 <br /> t <br /> 3.0. FINDINGS <br /> Results of field observations and laboratory analysis of soil and ground water samples are reported <br /> and discussed in the following sections. <br /> Advanced GeoEnvaronmental,ine <br /> u <br />