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Project 06605 <br />Page 2 of 2 <br />In the case of the gas well, where the new mining plan has seated a mining <br />exclusion zone, there should be no extra stress on the gas line in the center of the <br />exclusion zone, as a result of the mining. The gas well, itself, is an even better <br />case, as the gas well is a deep bored hole, into which grouted steel pipe has been <br />placed. The wellhead sits atop this casing. We have seen similar wells where the <br />soil has been completely removed around the well for some depth, without <br />compromising the integrity of the well. Therefore, although we anticipate no <br />additional structural stress on the well, with the proposed mining plan, there is a <br />higher factor of safety than with other types of facilities or structures. <br />Waterways, such as the Godding Ditch, present a somewhat increased risk of <br />instability due to the continued presence of a source of water and the fact that it <br />is likely that the groundwater table will slope upwards toward the elevation of <br />the water surface elevation in the waterway. Therefore, we recommend that <br />there be an offset of a minimum of 50 feet from waterways, where no mining <br />takes place. From that point, the 3:1 slope discussed above would be applicable. <br />This scenario has been utilized, with good success, in other gravel pits, with <br />similar geologic and soils conditions. <br />Thank you for consulting with us on this phase of the project. If you have any <br />questions concerning this report, please do not hesitate to contact us. <br />Sincerely, <br /> <br />~s`;, ,;;,; `_ ; r•_ <br />~ SCOTT, COX AND ASSOCIATES, INC. <br />,, <br />n q p^J <br />` <br />' <br />e <br />_ ,gin i ii, <br />tl <br /> <br />'4~ } ~ ~ .~. M. Edwar assgow, PE <br /> Professional Geologist <br />