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2. EXCESS SPOII, FILLS <br />• A. STREETER FII,L <br />Requirement <br />Prior to 1994 Colowyo had been required to conduct subsidence monument surveys, piezometer well <br />testing, certified inspections and reports on a quarterly basis. Technical Revision No. 26 submitted to <br />the Division and approved on March 18, 1994, reduced these monitoring requirements. The current <br />monitoring requirements require quarterly piezometer well testing and a spring and seep assessment. <br />Monument surveys, certified inspections and reports will be completed in the second calendar quarter. <br />Response <br />Two monuments are located at approximate 100' intervals from the 6700' level to the 7200' level on the <br />Fill for a total of twelve monuments.. Refer to the 1995 Annual Reyort Mao for details regazding the <br />specific location of each monument. A printout of the survey data and diagrams aze shown in Exh i <br />6. Streeter Excess 'Fill. This survey monument data indicates that the trends of the past yeazs are <br />continuing: <br />1. The antiapated settling of the fill material remains stabile and unchanged. After initial settling <br />during the first four or five yeazs, analysis of the ongoing monitoring data indicates no <br />significant changes. Overall settlement ranges from 1.5 to 3.6 feet which is minimal <br />considering the depth of the fill at the upper elevations. The 67001evel survey monument data <br />indicated that the elevation of the entire bench had risen almost .5 foot over the last year. After <br />further investigation we found that the north reference point located on the sandstone rock bluff <br />had actually settled because of movement of the bluff itself. Because of this reference point <br />settling the 6700 level data was in error. In ] 996 the survey procedure will be modified by <br />establishment of another, more stable, reference point to monitor the 6700 level and possibly <br />the 6800 and 6900 levels using X, Y, Z coordinates. <br />2. Similaz to settling, lateral movement remains stabilized. Lateral movement has stabilized at <br />generally less than two feet and, with the exception of the 6700 level, in an easterly direction. <br /> <br />3 <br />