2010-08-27_REVISION - M1996052 (3)

Home Browse Search

ENVIRONMENT, INC. - - PAGE 2 - ADEQUACY RESPONSE #2 L.G. EVERIST, INC. FIRESTONE GRAVEL: RESOURCE AUGUST 25, 201 ? around or through them. Attached is a copy,of FEMA's definition confirming these plants do not need to be elevated. As noted in the first adequacy response L.G. Everist typically uses 100 yds of concrete for foundations of the various plants, buildings, scale, parking pads and support structures associated with the plants. The conveyor is a temporary structure that moves as mining progresses since it is used in place of haul trucks. It has no permanent foundation as it has to be moved regularly to accommodate mining. If mining ended prematurely, the equipment would be removed, leaving only the concrete foundations of the plants that would need to be demolished. Disposal could take place on the site by burying it in the backfill area Portions of the site lie within the 100 yr flood plain of the St Vrain. Any excavations created that intersect the flood plain will need to have armored inlet-outlet structures appropriately sized and placed to allow floodwaters to enter and exit without damage. Please address this issue in the mining plan and show required features as appropriate on the Mining and Reclamation Plan maps. FEMA's currently approved and mapped floodplain shows that the floodplain does intersect the site, however, at this time, there are questions as to how the floodplain and L.G. Everist's operations would affect or not affect each other. The flood plain location has been placed on the revised Pre Mining Map, Map Exhibit - C attached for your review. A floodplain study may or may not be required by the county. Until that information is available we can not design the requested inlet/outlet structures. Nor are we even sure they are needed. We will submit the floodplain conclusions and information once we have it. We will commit to submitting the design of these structures, if needed,. prior to moving into the area east of the old railroad bed. At this time we have an approved Flood Plain permit from-Weld County that allows operation west of the old railroad grade. Exhibit D - Mining Plan (Rule 6.4.4) Also be aware that placing structures of any kind, including excavations and reservoirs, in the designated flood plain will be subject to approvals from Weld County and FEMA (conditional letter of map revision, etc.) It seems likely, based on the configuration of the existing flood plain as shown on the provided FEMA map, that the removal of the existing elevated rail-bed may have impacts on the extent of the flood plain that will also need to be addressed as appropriate with Weld County. and FEMA. Thank you for the information. We have an approved Flood Plain Permit from Weld County for the original permit area west of the railroad (Permit #FHDP-263). We anticipate being in here for 3 to 5 years and do not expect to breach this barrier. By that time we believe the county will have resolved the floodplain location. L.G. Everist, Tnc. will address all required flood plain issues with Weld County and FEMA as necessary.