2019-08-29_PERMIT FILE - M2019028 ‎(3)‎

• Permit No: M2019028
• IBM Index Class Name: PERMIT FILE
• Doc Date: 8/29/2019
• Doc Name: Adequacy Review Response
• From: J&T Consulting
• To: DRMS
• Email Name: AME
• Media Type: D
• Archive: No

RE: J-2 Contracting Company—DPG Pit—Permit No. M-2019-028
112(c) Permit Application
Adequacy Review No. 1 Response 8126119
-3-
"Floodplain" for the Cache La Poudre and South Platte Rivers. Please specify the type of
floodway and floodplain on these maps (e.g., 100-year, 500-year).
Response: The floodway and floodplain locations have been labeled to specify that they
are the 100-year floodway and floodplain as designated from the Colorado Hazard
Mapping Program (CHAMP) study that is being conducted for this area.
11) Please identify the proposed fuel storage location(s) on Exhibits C-4 and C-5 Mining Plan
Maps.
Response: The locations have been revised and labeled on the revised Exhibit C-4 and
C-5 maps.
12) The Phase 4 acreage shown on Exhibit C-4 — Mining Plan Map (44.1 acres) is different
than the Phase 4 acreage shown on Exhibit C-5 — Mining Plan Map (45.4 acres). Please
explain and/or correct this discrepancy on the appropriate map.
Response: The acreage numbers have been updated and corrected on the revised
Exhibit C-4 and C-5 maps.
Exhibit D— Mining Plan (Rule 6.4.4):
13) The operator states the proposed permit area is 228.02 acres, with approximately 190.37
acres being mined, and the remaining area consisting of setbacks, road and utility right-of-
ways, equipment storage, and plant site access. Please specify the proposed affected
area if it differs from the proposed permit area, including all lands to be affected by the
operation (e.g., mining, stockpiling, processing, slurry wall installation, stormwater control
structures, sediment ponds, equipment storage, scale/scale house, improved or newly
constructed access/haul roads).
Response: The proposed affected area and the permit area are the same at 227.52 acres.
The acreage and boundary were updated so the total acreage is slightly different.
14) Please specify the proposed maximum disturbance (in acres) for which the operator is
proposing to post a financial warranty at this time. If this acreage does not include the
entire proposed affected lands, please commit to submitting a Technical Revision to
increase the maximum disturbed area and revise the bond estimate accordingly prior to
creating additional disturbance.
Response: The proposed maximum disturbed area has been calculated for the initial
mining phase and areas that will be disturbed. The financial warranty calculations have
been updated to reflect this. J-2 Contracting Company commits to submitting a Technical
Revision to increase the maximum disturbed area and revise the bond estimate prior to
creating additional disturbance.
15) If the proposed maximum disturbance at this time will occur in more than one of the five
proposed mining phases, please specify the type and estimated amount of disturbance to
occur in each phase (e.g., 45 acres — mining — Phases 1 and 2; 15 acres —
processing/stockpiling — Phases 3 and 4). This information is needed to calculate the
required financial warranty for the proposed operation.
Response: See the response to item 14 and also see the revised bond calculations and
Exhibit L bonding table and map.
16) Please confirm the proposed maximum mining depth for the operation is 114 feet (12 feet
maximum overburden + 102 feet maximum aggregate deposit).
4, 305 Denver Avenue—Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: [phone]