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s <br />~`~ ~~~`~`° ~ ~ --~-- 1708 East Lincoln Avenue #3 <br />Kumar & Associates, Inc. -~ Fort Collins, CO 80524 <br />'~+~ Geotechnical and Materials Engineers o C r ~ phone: (970) 416-9045 <br />and Environmental Scientists ~ ~~~6 fax: (970) 416-9040 <br />~~', e-mail: kaftcollins@kumarusa.com <br />~-,_ www.kumarusa.com <br />Office Locations: Denver, Colorado Springs, Fort Collins, Colorado <br />Branch Office: Pueblo, Colorado <br />October 17, 2006 <br />Ms. Jennifer Lee <br />Applegate Group, Inc. <br />1499 West 120`h Avenue, Suite 200 <br />Denver, Colorado 80234-2728 <br />Subject: Soil Sampling and Laboratory Testing, Proposed Pond Liner Material, <br />Hokestra Reservoir Project, Northeast Corner of I-25 and Firestone <br />Boulevard, Longmont, Colorado <br />Project No. 06-3-130 <br />Dear Ms. Lee: <br />This letter presents the results of soil sampling and laboratory testing performed on <br />samples of material proposed fcr use as reservoir liner at the Hokestra Reservoir <br />project located northeast of the intersection of Highway I-25 and Firestone <br />Boulevard in Longmont, Colorado. We previously submitted partial results of <br />laboratory testing in a letter prepared under our Project No. 06-3-130, dated <br />September 1 1, 2006. The results of the sampling and laboratory testing are <br />presented herein. <br />Proposed Construction: The Hokestra Reservoir project will consist of reconfiguring <br />and lining of an existing reservoir (Reservoir 2) formed by extraction of aggregates. <br />The reservoir is located directly south of St. Vrain Creek, east of the east I-25 <br />frontage road. It is desired to obtain lining materials from sources adjacent to <br />Reservoir 2 and from a proposed reservoir area east of Reservoir 2, which will be <br />mined in the future. <br />Site Conditions: Reservoir 2 had been dewatered at the time of our site visit on <br />August 14, 2006. Observation of the reservoir bottom indicated varied conditions, <br />mostly soils remaining following mining. The majority of the soils observed <br />appeared to be saturated. Reservoir 2 appears to be on the order of 10 to 15 feet <br />deep. The proposed borrow area to the east of Reservoir 2 is relatively flat with a <br />gentle slope down to the north. Existing commercial buildings are located to the <br />south of the reservoir. <br />Field Sampling: Samples of potential liner materials were obtained from three <br />locations, two at the future reservoir site east of Reservoir 2 and one within <br />Reservoir 2. Samples were obtained by excavating shallow test pits with a <br />backhoP. Test Pit 1 was excavated in the southwest part of the unmined area east <br />of Reservoir 2 and Test Pit 2 was excavated at the central part of the unmined area. <br />The third pit was excavated on the reservoir sideslope at the southeast corner of <br />Reservoir 2. This location is referred to as Reservoir #2 on the test reports. Test <br />Pits 1 and 2 encountered approximately 2 feet of clayey sand overlying gravel with <br />