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RMC Geoscience, Inc. <br /> Shadow Lake Mobile Home Community <br /> February 2, 2011 <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 December 16, 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). <br /> Trihalomethane (THM) compounds (Bromoform, Bromodichloromethane, Chloroform, and <br /> Dibromochloromethane)are frequently associated with water treatment processes and are analyzed <br /> during the fourth quarter monitoring event. The Del-Tech field monitoring summary report is <br /> included in Attachment I and the Argon analytical results are included in Attachment 2. Parameters <br /> measured in the field during purging and sampling are summarized in Tables I through I and <br /> laboratory analytical results are summarized in Tables 2a through 2c. <br /> Water Levels <br /> As summarized in Table 1, depth to groundwater varied between about 64 to 67 feet below the <br /> ground surface. Based on surveyed reference elevations,the groundwater table in the immediate <br /> vicinity of the monitoring wells occurs approximately at elevation —45.45 ft to -45.82 f, with a <br /> relatively flat gradient that appears to trend approximately to the southwest.' As described in <br /> previous reports,the groundwater gradient is defined solely by the three monitoring wells installed <br /> for mobile home community. Because the wells are relatively closely spaced, small changes in <br /> elevation can appreciably influence the gradient magnitude and direction. Additionally,the gradient <br /> applies only to the immediate vicinity of the monitoring wells and may not be representative of the <br /> surrounding area or region. <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 /> Ca ftie �ha wl eUoniwnngRe M\4Q2010Repo Q2010Re mwpd <br />