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CIVIL RES'JURCES,LLC <br />ENGINEERS fi PI-ANNERS <br />August 31, 2006 <br />RECEwe~Ep <br />Mr. Tom Schreiner SEP 0 1 2006 <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 Division of Reclamation, <br />Mining and Safety <br />Denver, Colorado 80203 <br />RE: Second Quarter 2006 Groundwater Quality Monitoring Results, Lupton Lakes Gravel Permit <br />Dear Mr. Schreiner: <br />The following letter report describes the results from the 2^" Quarter 2006 Sampling Event. This report is <br />being submitted in general compliance with approved Groundwater Sampling and Analysis Plan (GWSAP) <br />included in Technical Revision 2 (TR2) to the Lupton Lakes Gravel Permit issued by the State of Colorado <br />Division of Minerals and Geology. <br />Groundwater Monitoring Results <br />The 2^~ Quarter 2006 Sampling Event includes monitoring wells (CRMW) 1, 2, 4, 6, 7, 40, and 41. This <br />sampling indicates that the Primary Drinking Water Standards (PDWS) were exceeded for total arsenic and <br />nitrates. Nitrate (as N) exceeded PDWS in six of the seven wells across the site typically ranging from 10.2 <br />to 38.4 milligrams per liter. Total Arsenic exceeded the PDWS in three of the four wells tested. Fluoride, <br />Mercury, or Fecal Coliform did not exceed the Standards or were undetected in all wells tested. Secondary <br />Drinking Water Standards (SDWS) were exceeded for Total Dissolved Solids (TDS) (624 to 1,100 <br />milligrams per liter, typical), and Total Iron (13 to 75 milligrams per liter, typical) consisten0y across the site <br />in each of the sampling events. The remainder of the SDWS, Chloride, pH, and Sulfate did not exceed the <br />SDWS. Benzene was detected at a concentration of 1.7 micrograms per liter in CRMW6. There were no <br />other hydrocarbons, chlorinated herbicides, aromatic volatile organics, and organochlorine compounds <br />detected in this quarter's sampling event. 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 <br />July sampling event. Groundwater contours have been drawn on the figure also based on these <br />measurements. The gradient is northwest toward the South Platte River. The results of this sampling event <br />are consistent with anticipated results when the GWSAP was developed. Further sampling will be <br />completed in September consistent with the approved GWSAP. <br />Please contact me if you have any questions. <br />Sincerely, <br />CIVIL RESOURCES, LLC <br />.6~~ <br />Andy Jesik, P.E. <br />Project Engineer <br />J:ISW Investment Group -12315W TKO Joint VenturelenvironmentaOWQ Monitodrgl3rdgir06- Itnptdoc <br />451 ^AK STREET, 5111TE 209 ~ P.O. BOX 6B0 ~ FREDERICK, CO H0530 ~ (303) 833-1 41 6 ~ (3031 833.2850 - EAX <br />