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Ms. Christina Kaminikar <br /> Varra Coal Ash Project <br /> April 7, 1999 <br /> Page 2 <br /> 3 - The surficial geology of the area as documented by Colton, 1978, varies between wind <br /> blown deposits of clay, silt and sand and sandy to gravelly alluvium, which are Holocene in <br /> age. Colluvium consisting of bouldery to pebbly sandy silt and clay may contain and <br /> interfinger with alluvium of various ages. The thickness of surficial alluvium is estimated to <br /> ^ Cvary between 20 and 50 feet. Local soil conditions observed during the installation of <br /> a' monitoring wells will be documented on soil boring logs, which will be provided to DMG. <br /> 4 - Water well records obtained from the Colorado Division of Water Resources indicates <br /> that one well may be located within one-quarter mile of the proposed test plot. The <br /> registered well owner is Dakolios Construction and the permitted use of the well is <br /> industrial. The location of registered wells within a half-In' e radius of the proposed test ,1, '. <br /> 17 <br /> plot are depicted on Figure 2 of the work plan. Please note field verification of well' <br /> location and construction will be performed prior to project start-up. J <br /> Mr. Gambrel', water com missioner for Division I, District 5 water district, indicated by <br /> phone conversation that there are no domestic or agricultural diversions off the St. Vrain <br /> River in the study area. He did indicate that Public Service Company operates a diversion <br /> down stream of the study area and that water is used for cooling purposes. As such, the <br /> ,potential for adverse impact to human health or agricultural resources is very limited. <br /> In reply to Mr. Posers letter of January 7, 1999 we offer the following comments and address his <br /> issues by item. <br /> 1. Figure 3 of our Work Plan shows anticipated monitoring points and our conceptual <br /> monitoring well network. The inferred groundwater flow direction was estimated <br /> from topographic maps and the local flow direction cannot be accurately determined <br /> from available data. Prior to coal ash p a-cement, three groundwater monitoring wells <br /> will be placed in the vicinity of the proposed trench location to determine local flow <br /> direction. The actual location of the trench and monitoring wells will be adjusted as <br /> needed to conform with our conceptual design. <br /> 2. Proposed analytical methods are presented in our work plan and include a <br /> combination of ICP, AA and GFAA procedures. All detection limits will meet or <br /> exceed those required for this project. <br /> 3. Our monitoring plan includes a monitoring point downstream on the Saint Vrain <br /> Creek. <br /> dmgresponse.doc <br />