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11566 WCR 18 <br />Fort Lupton, CO 80621 <br />January 15, 2005 <br />Lynn Mayer <br />Regulatory Manager <br />L. G. Everist Inc. <br />7321 E. 881° Avenue, Suite 200 <br />Henderson, CO 80640 <br />`~~~EIVED <br />`~ ~-~ ~ (7 ~Qdrt <br />'~i~ision othiinerals & Geology <br />Re: L. G. Evetist, Int.'s Fort Lupton Saad and Gravel Mine <br />Colorado DMG Permit # M-1999-120, Weld County Permit # USR-1255 <br />Dear Ms. Mayer: <br />Thank you for getting back with me to address my concerns in your letter dated <br />December 17, 2004. <br />I have had the opportunity to review the material you left with me and that you have sent <br />me since. I have also reviewed what is on record with Weld County regarding your <br />amendment to your permit. <br />First, I would like to make a correction from your letter to me. You stated that I am not <br />concerned about the water wells I have on property located more than 1,000 feet to the <br />west of your amendment attn. This is not correct. I am in fact concerned about not only <br />the well east of the river, but also about the wells to the west of your proposed new <br />boundary. <br />I have reviewed the report from Wright Water Engineers dated 7anuary 3, 2005 fox your <br />DMG permit The groundwater data presented is all gathered after L. G. Fverist had <br />already ilrstalled a slurry wall in the existing permitted area. I have seen no baseline data <br />from before the slurry wall was constructed and therefore have a hard tune drawing the <br />same conclusions as expressed in the report. Further, there should be baseline data from <br />monitoring wells 15 and 16 from before they were damaged during the construction of <br />the slurry wall. I believe this baseline data is crucial in understanding the impact of the <br />existing slurry wall on the groundwater flows and levels. I also believe this <br />understanding needs to be obtained before allowing mote slurry wall construction or <br />determining trigger points. It is for this same reason that the computer models of future <br />slurry walls' impact on groundwater does not seem reliable. It would take baseline data <br />from before any slurry walls were constructed to accurately model groundwater efFects. <br />Again, what has been used for the existing model is data gathered after a slurry wall was <br />already in place. <br />My cortcem about the odors from an asphalt batch plant still stands. You state that the <br />baghouses are designed to contain the majority of emissions of air pollutants from asphalt <br />plants. I would agree that they ate designed to contain the majority ofpatticulate <br />emissions. I would not agree that they are designed sn contain the odors. In addition, I <br />know that baghouses have failed bags or socks from time to time. I•Iow does L. G. <br />SSIli$A3 9 Z 86Ci68ZCOC ~~3 TTT:6T 50/Oi/ZO <br />