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report by Nielsons Inc. entitled Petrographic Examination of <br />Aggregate For Riprap - Wheeler Pit, La Plata County, Colorado. <br />This report can be found in Appendix E. <br />Two test pits were excavated in 1986 by Sun Dale Engineering and <br />Testing in the vicinity of Borrow Area B. This data is not. <br />included in this report because the test pits could not be <br />accurately located. <br />B. 1989 EXPLORATION PROGRAM <br />An exploration program consisting of 42 backhoe test pits <br />(TP-B-301 through TP-B-342), and four drill holes (DHBAB-1 <br />through DHBAB-4) was undertaken in November and December 1989 to <br />investigate coarse-grained materials in Borrow Area B. Logs of <br />the explorations are included in Appendix A, and locations of <br />• • <br />these explorations are shown on Drawing No. 69-406-1921. <br />The backhoe test pits were excavated under private contract by <br />Weminuche Construction Co. to obtain samples to investigate the <br />quality and quantity of natural materials in Borrow Area B. Most <br />of the materials encountered during this investigation represent <br />the uppermost (top 20- to 30-feet) portion of the coarse-grained <br />material deposit. Test pits TP-B-301 through TP-B-307 were <br />excavated with a Bucyrus-Erie 300H backhoe. Mechanical <br />difficulty with the above mentioned backhoe resulted in the <br />remaining test pits being excavated with a Caterpillar 300EL <br />backhoe. The test pits were located on an approximate 400-foot <br />grid throughout the area. Five of the test pits, TP-B-333, and <br />TP-B-339 through TP-B-342 fell outside the final designated <br />borrow area limits. <br />Weerninuche Construction Authority <br />P.O. Box AA - Towaoc, CO 81334 <br />AN1MA5 GLAD 0372_ c tzme L. 16 <br />Ahl 4,?tkt PITS • l??Cs67 3`. - Z`F