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i <br /> 1RMC Geoscience, Inc. <br /> Shadow Lake Mobile Home Community <br /> November 15, 2010 <br /> Page 3 <br /> GROUNDWATER SAMPLING PROCEDURES AND RESULTS <br /> Groundwater purging and sampling`was completed by Del-Tech Geotechnical Support Services <br /> (Del-Tech) on September 22, 2010. •Samples were collected from the three wells and submitted <br /> under Chain-of-Custody control to Argon Laboratories (Argon) to be analyzed for total coliform <br /> organisms, ammonia as nitrogen, nitrate as nitrogen, pH, and total dissolved solids {TDS}. THM <br /> compounds p (Bromoform, Bromodichlaromethane, Chloroform, and Dibrornochloromethane) are <br /> frequently associated with water treatment processes and are analyzed during the fourth quarter <br /> monitoring event. The Del-Tech field monitoring summary report is included in Attachment 1 and <br /> the Argon analytical results are included in Attachment 2. Parameters measured in the field during <br /> purging and sampling are summarized in Tables la through lc and laboratory analytical results are <br /> j summarized in Tables 2a through 2c. <br /> I <br /> Water Levels <br /> i <br /> i As summarized in Table 1, depth to groundwater varied between about 66 to 68 feet below the <br /> i <br /> ground surface. Based on surveyed reference elevations, the groundwater table in the immediate <br /> vicinity of the monitoring wells occurs approximately at elevation—48.32 ft to -48.55 ft, with an <br /> approximate gradient to the southwest.' As described in previous reports,the groundwater gradient <br /> is defined solely by the three monitoring wells installed for mobile� g b le home community. Because the <br /> wells are relatively closely spaced,small changes in elevation can appreciably influence the gradient <br /> magnitude and direction. Additionally, the gradient applies only to the immediate vicinity of the <br /> monitoring wells and may not be representative of the surrounding area or region. <br /> f <br />�. 'Groundwater elevations associated with well MW-3 are uncertain because this well was <br /> repaired and the reference elevation has not been resurveyed to date. <br /> C:�A—ProjmisLShadowLekeNoni[oringRcponsllQ2010ReponUQ2010Reponwpd <br /> . F <br /> F <br />