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M • . February 9, 2001 Davis Graham & Stubbs LLP 1550 Seventeenth Street Suite 500 Denver, Colorado 80202 Attention: Mr. Scot W. Anderson Subject: Tatum Residence 12630 Highway 12 near Weston, Colorado Job No. 32,485 Dear Mr. Anderson: III IIIIIIIIIIIII III 999 ~ (~ '~'~'E' °-~'ED F=~ i 1 ZU01 Division of Minerals and Geology At your request, I have reviewed my files identified as Job No. 21,239, with a report dated March 24, 1994 regarding the Tatum residence, which is located near Weston, Colorado. My previous involvement with this structure included two trips to the site and testimony in a trial in 1997. It is my understanding the owners of the residence have filed an additional claim against Basin Resources. I met with Mr. John Rold of Wright Water Engineers and allowed him to review the contents of my file. Mr. Rold provided me with pictures taken during his site visit of December 5, 2000 and samples of clay that he obtained while making his inspection of the residence. It is my understanding the samples came from the crawl space area. CTLffhompson, Inc. performed laboratory tests on the samples provided by Mr. Rold. Three pieces of sample were cut from the block type sample and trimmed to remove disturbed areas. These specimens were then weighed in air and subsequently coated with wax. The specimen was then weighed in air and water to determine the volume of the specimen. Using standard laboratory procedures, the moisture content and weights of the samples were determined. Using this method the bulk dry density of the specimen was determined. The specimens had a dry density ranging from 91.9 pounds per cubic foot (pcf) to 97.8 pcf. The remainder of the materials provided by Mr. Rold was processed to perform Atterberg limits determination, grain-size analysis and a Harvard miniature compaction test. The Harvard miniature compaction procedure allows determination of a laboratory compaction curve similar to a Proctor compaction procedure; however, the energy is substantially less and therefore the maximum dry density and optimum moisture content is usually lower than determined using the standard Proctor test as described by ASTM D 698. The specimens compacted using the Harvard miniature compaction equipment were tested to determine the unconfined compressive strength of each specimen. The results of these laboratory tests are included as Table I. The sample was a low plasticity clay which would classify as CL in the Unified Classification System. The bulk density was low and the moisture content CTL/THONIPSON, 1NC. CGNSULTING ENGINEERS 7S'14VE3i IeTH A`JE^lUE • DEN`JEn. COLORADO 8020~~ • (303)825-0777