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06 August 2000 <br /> AGE Project No. 95-0118 <br /> Page 2 of 5 <br /> Vapor samples were collected on 07 February, 23 April, 31 May and 28 June 2.000 from the influent <br /> 1.' ' and effluent streams using Tedlar bags. <br /> s:. The samples were labeled, placed in an ice chest and transported under chain-of-custody to <br /> McCampbell Analytical Inc. of Pacheco (MAI). Each sample was analyzed for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) and for volatile aromatic hydrocarbons (benzene, <br /> toluene, ethyl benzene and xylenes: BTE&X) including methyl tertiary butyl ether (MTBE) in <br /> accordance with EPA method 8015-modified and EPA method 8020, respectively. <br /> _i <br /> 2.2. GAUGING OF DEPTH TO GROUND WATER AND PURGING OF WELLS <br /> On 23 February 2000, the depth to ground water in monitoring wells MW-1 through MW-6 was <br /> measured relative to the top of the well casings using a Solinst water level meter. Subsequently, <br /> approximately six to eight gallons of water(a minimum of three well volumes) were removed from <br /> each ground water monitoring well using a submersible PVC pump. An ICM Model 52200 water <br /> analyzer was utilized to monitor temperature,pH and conductivity of purged water at regular purge- <br /> volume.intervals. Dissolved oxygen levels were measured with a YSI 55 dissolved oxygen meter. <br /> Purged ground water was containerized in 55-gallori drums and stored on-site. Stabilization data and <br /> field logs are included in Appendix A. <br /> 2.3. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from the purged wells using new disposable plastic bailers. The <br /> collected samples were transferred into EPA-approved 40-m1 VOA vials containing 0.5 milliliters <br /> ] hydrochloric acid (18%) as preservative. The samples were labeled, logged on a chain-of-custody <br /> form, placed in a chilled container and transported to MAI. Each sample was analyzed for TPH-g <br /> and BTE&X including MTBE in accordance with the same methods as those of the vapor samples. <br /> 3.0. FINDINGS <br /> 3.1. SOIL VAPOR EXTRACTION <br /> During the reported period, the SVE unit operated at an extraction flow rate of 70 scfm. An induced <br /> vacuum(negative pressure)of approximately 25 inches of water was measured in the piping between <br /> the blower and the extraction wells. Vacuum pressures as high as 2.8 inches of water were observed <br /> at vapor well VW-1. <br /> i <br /> Advanced GcoEnvironmental,Inc. <br />