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MOLEN & ASS©CiATES, LLC <br />ENVIRONMENTAL CONSULTANTS <br />2090 E. 104U' Ave., Suite 202 ~ Thornton, Colorado 80233 <br />Office 303-450-1600 ~ Fax 303-452-4515 <br />September 18, 2003 RECE!l~Ep <br />Ms.-Jamie Gaboriau $E~ Z ~' Z.ri'~3 <br />Aggregate Industries Qirision ai Miaerafs and Geabsy <br />1707 Cole Blvd., Suite 100 <br />Golden, CO 80401 <br />Re: Sample Results for DIMP on Topper Property and Lake <br />Deaz Ms. Gaboriau: <br />This letter is a brief report on the results from sampling performed at the 8120 E. 104`s Ave, <br />Henderson, Cb from the back of the Topper home and the lake on the Jeronimus Property. The <br />results indicate that diisopropyl methyl phosphonate (D]MP) was not found above thee detectioalimit <br />-of-~~.---------- --_ _ ---------- <br />Samples were taken from the Topper well on August 19, 2003 and from the lake on August 6, 2003. <br />Chain of custody receipts for the sampling events aze attached. The samples were taken using the <br />Colorado Deparanent of Public Health and Environment (CDPHE) Water Quality Control Division; <br />ground-water permit guidance suggested monitoring well sampling protocol. A copy of the permit <br />guidance is also attached. <br />The results from the sampling events show that DLMP was not detected above the method detection <br />limit of 5 ug/L. Copies of the analytical results aze attached. The CDPHE Laboratory and Radiation <br />Services Division was the analytical laboratory used for the sample analysis. This is the same <br />laboratory used in the initial stages of determining the DIMP plume from the Rocky Mountain Arsenal <br />in the late 1990's. The Colorado Water Quality Control ground water standazd for DIMP is 8 µgfL. <br />SamalinQ of Toaoer W ell <br />~h~watei c e n e opper prope was sarnp e~ on Auguste Tl-ZOOS Tie ra ora ory <br />provided sample bottles used to collect the water well samples. The well was purged of well over 3 <br />well bore volumes. Four samples were checked for conductivity, pH, and turbidity and the results <br />determine that the well water was stable prior to collecting the samples. Samples were placed into a <br />styrofoam "cooler" box provided by the laboratory. The box contained frozen ice packs. The samples <br />were submitted to the CDPHE Laboratory within hours from when the samples were taken. Standard <br />chain of custody procedures were used for the collection and delivery of the samples to the laboratory. <br />The water well is one foot in diame±er, has a steel casir_g, and was completed into the alluvium in <br />1968. Ralph Topper stated that the depth to water was 36 feet and the total depth is 86 feet. Well water <br />levels checked and listed below are close to these values. The 3 horsepower pump produces <br />approximately 150 gallons per minute. The well penetrates the entire alluvial section with the base of <br />