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s , <br /> f <br /> l <br /> RMC Geoscience, Inc. <br /> Shadow Lake Mobile Home Community I <br /> April 13, 2009 <br /> Y <br /> Page 3 i <br /> 1 <br /> r <br /> GROUNDWATER SAMPLING PROCEDURES AND RESULTS . <br /> Groundwater purging and sampling was completed by Del-Tech Geotechnical Support Services <br /> (Del-Tech) on March 6, 2009. Samples were collected from all of the wells and submitted under <br /> Chain-of-Custody control to Argon Laboratories (Argon) to be analyzedfor total coliform ` <br /> organisms, ammonia as nitrogen, nitrate as nitrogen, pH, and total dissolved solids (TDS). <br /> Trihalomethane(THM) compounds are analyzed annually during fourth quarter monitoring effort <br /> and were not included in this monitoring event. The Del-Tech field monitoring summary report is ' <br /> r <br /> included in Attachment 1 and the Argon analytical results are included in Attachment 2. Parameters <br /> measured in the field during purging and sampling are summarized in Tables 1 a through 1 c and <br /> laboratory analytical results are summarized in Tables 2a through 2c. <br /> i1 <br /> S <br /> Water Levels <br /> t <br /> As summarized in Table 1, depth to groundwater varied between about 65 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 --45.82 ft to -46.22'ft, with an <br /> approximate gradient to the southwest.' As described in previous reports,the groundwater gradient <br /> 4: is defined solely by the three monitoring wells installed for mobile home community. Because the <br /> wells are relatively closely spaced,small changes in elevation can appreciably influence the gradient <br /> iY 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 /> 4 Analytical Results <br /> As shown in Tables 1(a-c) and 2(a-c), field and laboratory analytical results for the March 2009 <br /> monitoring event were generally similar to the results obtained during the previous monitoring ' <br /> periods (groundwater monitoring at the site was initiated in October 2001). As described in the <br /> I. <br /> 'Groundwater elevations associated with well MW-3 (-45.86 feet on March 6, 2009) are <br /> uncertain because this well was repaired and the reference elevation has not been resurveyed to <br /> date. k <br /> i; <br /> CAA_Projects\Shado�%LakeWonf toringReportsU Q2009ReportU Q2009Repar1.wpd .� <br /> II4 <br /> k <br />