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~~ ~'~ <br /> <br />C~L RES'~URCES,LLC <br />ENGINEERS & PLANNERS <br />RECEIVED <br />May 15, 2006 ~w IMAM f s <br />Mr. Tom Schreiner ~glvlalon of Minerals and geology <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: First Quarter 2006 Groundwater Quality Monitoring Results, Lupton Lakes Gravel Permit <br />Dear Mr. Schreiner: <br />The following letter report describes the results from the 15) 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 Monitorino Results <br />The 15) Quarter 2006 Sampling Event included 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 fecal coliform, <br />total arsenic, and nitrates. Fecal coliform was measured in monitoring well CRMW-41 which is on the north <br />end of the site near the Landrus well. Nitrate (as N) exceeded PDWS in six of the seven wells across the <br />site typically ranging from 11 to 22 milligrams per Iiter..Total Arsenic exceeded the PDWS in three of the <br />four wells tested. Fluoride and Mercury did not exceed the Standards or were undetected in all wells tested. <br />Secondary Drinking Water Standards (SDWS) were exceeded for Total Dissolved Solids (TDS) (670 to <br />1,010 milligrams per liter, typical), and Total Iron (43 to 280 milligrams per liter, typical) consistently across <br />the site in each of the sampling events. The remainder of the SDWS, Chloride, pH, and Sulfate did not <br />exceed the SDWS. Hydrocarbons, chlorinated herbicides, aromatic volatile organics, and organochlorine <br />compounds had no detection in this quarters sampling event. Additional parameter test results and the <br />summary of all laboratory analysis results are contained in the attached table. <br />Figure 1 shows the location of the monitoring wells and the groundwater contours measured during the April <br />sampling event. 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 July consistent with the approved GWSAP. <br />Please contact me if you have any questions. <br />Sincerely, <br />CIVIL RESOURCES, LLC <br />Brad L. Hagen, P.E. <br />Principal <br />J:ISW Investment Group -12315W TKO Joint VenWrelenvironmentallWO MonitodrgllstgW6- ItrrpLdoc <br />457 ^AK STREET, SUITE 2O9 ~ P. O. BOX 680 ~ FREDERICK, CO 80530 ~ 13O3I 833-1 41 6 ~ (3O3) 833-28 SO - fAX <br />