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
-8-
reclamation. The revised Exhibit L bond calculations include these costs.
31) The proposed temporary stockpile seed mix includes Crested wheatgrass. While this
grass species can be helpful for quick stabilization, it is not compatible with native grasses.
If used for topsoil stabilization, this species would become part of the topsoil seedbase
and potentially interfere with the growth of desired native grasses when the topsoil is used
for reclamation. Please remove this species from the temporary stockpile seed mix, or
replace it with a species that is more compatible with native grass species.
Response: The temporary stockpile seed mix has been revised to remove crested
wheatgrass.
32) Please provide the expected time of year for reclamation seeding.
Response: The reclamation seeding will be completed per CDOT's requirements that
state seeding can occur anytime after spring thaw until June 1st and from September 15"'
until there is a consistent ground freeze.
Exhibit F— Reclamation Plan Map (Rule 6.4.6):
33) Exhibits F-1 and F-2 Reclamation Plan Maps do not show any roads to remain around the
reservoirs for reclamation. Does the operator propose leaving any roads within the
affected lands for reclamation? If not, how will the proposed reservoirs be accessed for
maintenance? Please be sure to show on the reclamation plan maps any roads to remain
for reclamation.
Response: The reclamation plan maps have been updated to show the access roads that
will remain around the perimeter of the reservoirs.
34) Exhibits F-1 and F-2 Reclamation Plan Maps identify the location of a "Floodway" and a
"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 The floodway and floodplain locations have been labeled to specify that
they are the 100 year floodway and floodplain as designated from the CHAMP study that
is being conducted for this area.
Exhibit G —Water Information (Rule 6.4.7):
35) Please provide a stormwater management plan for the proposed operation.
Response: J-2 Contracting Company commits to providing a stormwater management
plan for the proposed operation when they apply for the stormwater/dewatering permit
from CDPHE. This permit will be required but J-2 Contracting Company will not apply for
this permit until they are certain they will receive approval from Weld County for a Use by
Special Review permit. J-2 Contracting Company commits to utilizing best management
practices for all sediment traps, sediment ponds, erosion control measures, etc. to
ensure that sediment transport is minimized and contained within the area of the
operation and stormwater management plan. A stormwater management plan will be
provided to the DRMS once J-2 Contracting Company finalizes it specific to this
operation.
36) The proposed lined reservoirs are located within the 100-year flood plain of the nearby
rivers. Therefore, please provide a flood analysis and control plan addressing how the
operation will safely convey the expected 100-year flood event throughout the life of mine,
R I 305 Denver Avenue—Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: [phone]