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Mr. Tom Schreiner <br />June 25, 2007 <br />Page 2 <br />~~ <br />CIVIL RES'7JURCES, LLC <br />Secondary Drinking Water Standards (SDWS) were exceeded for Total Dissolved Solids (TDS) (612 <br />to 1,296 milligrams per liter) consistently across the site, and chloride exceeded SDWS at 252 mg/L <br />in CRMW09, which was the same concentration in the December 2006 sampling event. It should be <br />noted that the chloride concentrations of CRMW09 were not considered in the establishment of the <br />proposed chloride baseline levels due to a limited number of sampling at that time and should be <br />revised in this years annual report along with the other parameters and wells included with this <br />years sampling plan. Sulfate concentrations exceeded the SDWS by 5.21 and 7.25 mg/L in wells <br />CRMW02 and CRMW09 respectively. The remaining SDWS parameters tested for including pH <br />and Iron did not exceed the SDWS. Additional parameter test results and the summary of all <br />laboratory analysis results are contained in the attached table. <br />Figure 1 shows the location of the monitoring wells and the groundwater elevations measured during the April <br />sampling event. Groundwater contours have been drawn on the figure also based on these measurements. <br />The gradient is northwest toward the South Platte River. The results of this sampling event are consistent <br />with anticipated results when the GWSAP was developed. Further sampling will be completed in July <br />consistent with the approved GWSAP unless the baseline water quality report is approved with the <br />modifications presented to the GWSAP. <br />Please contact me if you have any questions. <br />Sincerely, <br />CIVIL RESOURCES, LLC. <br />Joseph A. Jesik, P.E. <br />Project Engineer <br />J:IDenverWater-15112007 DMG SamplingWpol SamplingWpd107- Itrrpt.doc <br />