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<br />Mr. Gary Curtiss <br />Page Two <br />In order to ascertain whether Western Mobile's activity during the last few years <br />may have had an impact on the water table, the annual reports for the years 1992 <br />and 1993 were reviewed. Enclosed in Appendix B are the aerial photos of our <br />mining activities. In the November 1992 photo, no dewatering was taking place <br />and all the lakes were holding water. In October of 1993, dewatering had been <br />underway since June 1993. The depth of the trench up to that time was <br />approximately 22 feet and was dewatered from the northwest corner with two diesel <br />pumps. The vertical shaft pump was put in operation in September 1993 and the <br />dewatering trench was lowered to its current elevation. Comparing the two <br />pictures, it is apparent that Lake D has been lowered. This is the result of: <br />(1) the berm between Lake D and the mining area being built out of native sand <br />and consequently not having any impermeable properties; and (2) the dewatering <br />trench in the mining area was 10 to 15 feet deeper than Lake D. Note the <br />location of the dewatering trench. The trench was not extended to its current <br />location, parallel to road F, until April of this year. As the photos both show, <br />the swampy area (circled area on map) held water (approximately 12' bgl). After <br />the trench was cut. the water level dropped to approximately 15' bgl. <br />I hope this information is beneficial in helping you analyze this issue. If I <br />can be of any further assistance let me know. <br />Sinc rely, <br />Greg Lindsay <br />Concrete and Aggregate Manager <br />cc: Shawn Hoff. Division One Water Commissioner <br />Elmer Andrews <br />