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SITE INVESTIGATION <br /> Ground water sampling was conducted on December 18, 1992 to <br /> comply with quarterly monitoring of this site . Various <br /> parameters of the ground water beneath the site were determined <br /> by- 1) recording depth to water (by use of a resistivity meter) <br /> for the monitor wells, 2) purging and containment of ground water <br /> from the wells; 3) collecting water samples from the wells; 4) <br /> submitting these water samples to a State Certified Analytical <br /> testing laboratory via established "chain of custody" procedures <br /> The water was analyzed for Total Fuel Hydrocarbons (TFH) as <br /> gasoline and Volatile Aromatic Hydrocarbons (BTEX) using EPA <br /> Methods 5030 and 602, respectively. <br /> Methods and Procedures <br /> The ground water was sampled in six monitoring wells by a Western <br /> Geo-Engineers (WEGE) geologist, working directly under the <br /> supervision of California Registered Geologist #3037 Using a <br /> resistance probe, WEGE personnel measured the depth to ground <br /> water prior to sampling each well Each well was purged before <br /> collecting water samples . MW1, MW2, MW3 , MW4, MW5, MW& and MW7 <br /> were sampled after purging the wells of enough water that <br /> temperature, pH and conductivity stabilized. This data is <br /> presented in Appendix C. The purged water was contained in a <br /> labeled, secured 55 gallon drum on site. From the well <br /> information a ground water contour surface was plotted and a flow <br /> direction inferred. This is presented in Figure 4D. <br /> The wells were allowed to recover after purging. A water sample <br /> was then collected with a fresh bailer. Each sample was divided <br /> among four 44-m1 VOA vials. The vials are supplied by the <br /> laboratory or a chemical supply company and are pre-cleaned to <br /> exact EPA protocols . The sample vials were labeled as to <br /> station, well, time, and sampler, and documented on the chain-of- <br /> custody sheet; they were then placed into an ice chest and cooled <br /> to 40C with ice . The samples were delivered to a California <br /> State Certified Laboratory and signed over to the lab using <br /> standard chain-of-custody procedures. <br /> CHEMICAL ANALYSIS RESULTS , <br /> The samples were analyzed at Matrix Environmental Laboratories <br /> (DHS#1676) for Total Fuel Hydrocarbons (gasoline) with BTEX <br /> distinction, utilizing EPA Methods 5030 and 602, respectively. <br /> As noted under Purpose - and Scope above, water samples were <br /> 3 <br />