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i~ <br />• February 9, 2001 <br />Davis Graham Ji Stubbs LLP <br />1550 Seventeenth Street <br />Suite 500 <br />Denver, Colorado 80202 <br />Attention: Mr. Scot W. Anderson <br />Subject: Tatum Residence <br />12630 Highway 12 <br />near Weston, Colorado <br />Job No. 32,485 <br />Dear Mr. Anderson: <br />At your request, I have reviewed my files identified as Job No. 21,239, with a <br />report dated March 24, 1994 regarding the Tatum residence, which is located near <br />Weston, Colorado. My previous involvement with this structure included two trips to <br />the site and testimony in a trial in 1997. It is my understanding the owners of the <br />residence have filed an additional claim against Basin Resources. I met with Mr. <br />• John Rold of Wright Water Engineers and allowed him to review the contents of my <br />file. Mr. Rold provided me with pictures taken during his site visit of December 5, <br />2000 and samples of clay that he obtained while making his inspection of the <br />residence. It is my understanding the samples came from the crawl space area. <br />CTL/Thompson, Inc. performed laboratory tests on the samples provided by <br />Mr. Rold. Three pieces of sample were cut from the block type sample and trimmed <br />to remove disturbed areas. These specimens were then weighed in air and <br />subsequently coated with wax. The specimen was then weighed in air and water to <br />determine the volume of the specimen. Using standard laboratory procedures, the <br />moisture content and weights of the samples were determined. Using this method <br />the bulk dry density of the specimen was determined. The specimens had a dry <br />density ranging from 91.9 pounds per cubic foot (pcf) to 97.8 pcf. The remainder of <br />the materials provided by Mr. Rold was processed to perform Atterberg limits <br />determination, grain-size analysis and a Harvard miniature compaction test. The <br />Harvard miniature compaction procedure allows determination of a laboratory <br />compaction curve similar to a Proctor compaction procedure; however, the energy <br />is substantially less and therefore the maximum dry density and optimum moisture <br />content is usually lower than determined using the standard Proctor test as <br />described by ASTM D 698. The specimens compacted using the Harvard miniature <br />compaction equipment were tested to determine the unconfined compressive <br />strength of each specimen. The results of these laboratory tests are included as <br />Table I. The sample was a low plasticity clay which would classify as CL in the <br />. Unified Classification System. The bulk density was low and the moisture content <br />CTS/T~OiVjPSON, 1~]C. <br />CONSULTING ENGINEERS <br />;571 bVEST ICTH A\'E`:UE • vEN`JEn. CGLORADG.BG20-+ • (3C3) 025-0777 <br />