2018-03-20_PERMIT FILE - M2017049 (2)

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Alm . Transit Mix Concrete Co. 4) In Figures C-I I and C-12, the locations of all monitoring wells are shown on the Insert Plan View, with the exception of MW-LTC-7. Please add the location of MW-LTC-7 to the insert. Additionally, monitoring wells MW-LTC-2 and MW-LTC-6 appear to be mislocated, as they are outside of the proposed permit boundary. Please correct the locations for these two wells. Response: Figures C-I I and C-12 have been updated to accurately show the monitoring well locations and to show the MW-LTC-7 location. 5) In Figure C-12, Insert Plan View, Little Turkey Creek is located approximately 300 feet from the northern pit crest on section line C-C'. However, on the C-C' cross-section the northern pit crest is located approximately 200 feet from Little Turkey Creek. Please eliminate the contradiction and ensure all permit documents consistently describe the operation. Please revise the cross-section and/or insert to ensure consistency and accuracy. Response: Figure C-12 has been revised to show the surveyed creek location. The pit crest is located approximately 260 feet from Little Turkey Creek. Similar to Figure C-11, this cross- section shows a discrepancy between the topography and the creek location. Transit Mix had the creek and road surveyed by a licensed surveyor; however, the topography is from the El Paso County data clearinghouse based on a LIDAR flight. The discrepancies between the two data sources are likely the result of the LIDAR limitations, topographic changes between the LIDAR flight and the present(i.e. flooding and road work). As stated on Figure C-1, Transit Mix has used the best available data for all designs and figures. EXHIBIT D - Mining Plan (Rule 6.4.4) 6) Please provide discharge/energy dissipation details for drainage channel 172-2 at station 29+00 per Figure C-9d. Please provide these details for both the operational phase and final reclamation phase. Response: Typical energy dissipation details are included on Figure G-16. A riprap apron at the culvert outlet draining from the Plant sediment detention basin will provide energy dissipation during the operation of the quarry. This apron will extend below the culvert outlet at least two times the culvert diameter. For reclamation, the culvert will be replaced with an open channel excavated into native bedrock. The channel gradient of approximately 3.6% matches the gradient in Little Turkey Creek and no additional energy dissipation is required at the confluence of the creek and channel F2-2. EXHIBIT E -Reclamation Plan (Rule 6.4.5) 7) Revised Figure C-1 shows the portion of the access road to be paved, and the approximate location of the proposed power distribution line. However, Figure C-1 does not delineate or label the proposed 4-strand wire fencing. Additionally, the applicant's response to Item No. 51 of the Preliminary Adequacy Review states that removal costs have been included in Exhibit L for this fencing. However, the only fencing demolition costs included in Exhibit L address 245 feet of chain link fencing from the central substation. Please revise Exhibit L to include costs for removing the 4-strand fence, and Figure C-1 to delineate and label the 4-strand fence. Hitch Rack Ranch Quarry(M-2017-049) Response to Comments—March 20,2018