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angle of draw at the South Grid. <br />City of Florence Water Line <br />Survey measurements of the water line monuments indicate subsi- <br />dence occurring only at Monument "E". Total displacement at <br />Monument "E" is 0.41 feet with a change of 0.20 feet from the <br />preceeding survey in May, 1986. The change observed during this <br />reporting period is comparable to the 0.17 feet measured during <br />the previous six month period. It is anticipated that minor <br />subsidence at this monument will continue as the underground caved <br />area continues to consolidate. Monuments "B" through "D" are not <br />indicating any subsidence and are not anticipated to do so until <br />they are undermined. <br />wlin Creek Streambed <br />Survey data for this reporting period detected total subsidence of <br />0.62 feet and a change from the preceeding survey of 0.02 feet. <br />The relatively high rate of movement observed during the previous <br />reporting period has apparently ceased and equilibrium has been <br />reached. The cause of the subsidence, possibly caving of abandon- <br />ed mine workings as described in the previous semi-annual report, <br />may be complete and will be verified by continued monitoring of <br />the Streambed Monument. <br />Thompson Ranch Structures <br />No subsidence was detected on the three structures monitored at <br />the Thompson Ranch. It is anticipated that there will be only <br />very minor additional subsidence in this area. <br />Conclusions <br />a <br />The subsidence detected during this six month monitoring period is <br />comparable to the predictions made by RMG in the Mining Permit. <br />No structural damage has been observed nor is any expected. It is <br />anticipated that additional subsidence of all monitored monuments <br />and structures will be minimal and within the maximum values <br />predicted in the Mining Permit. <br />