2018-12-26_REVISION - M2008078 ‎(29)‎

• Permit No: M2008078
• IBM Index Class Name: Revision
• Doc Date: 12/26/2018
• Doc Name Note: Preliminary - Part 1 of 4
• Doc Name: Adequacy Review Response
• From: J&T Consulting
• To: DRMS
• Type & Sequence: AM1
• Email Name: AME
• Media Type: D
• Archive: No

RE: Prowers Aggregate Operators, LLC. — West Farm Pit—Permit No. M-2008-078
112c Permit Amendment Application (Revision No. AM-01)
Preliminary Adequacy Review Response 12121118
-8-
is complete. Ponds and ditches within the mining area will be mined through and
removed as part of the extraction of the sand and gravel reserves.
24) Please describe the reclamation to be achieved for the scale house. Will any portions of
this feature require demolition for reclamation? If so, please be sure costs for its demolition
and removal are included in the reclamation bond estimate in Exhibit L.
Response: The scale house is a mobile trailer unit that is sitting on temporary
concrete blocks. The scale house will be removed via towing it offsite and the
temporary concrete blocks will be removed and landfilled. No demolition will be
required. The area disturbed by the scale house will be reclaimed by scarifying,
topsoiling, and seeding the area.
25) Please describe the reclamation to be achieved for the future conveyor. Will any portions of
this feature require demolition for reclamation? If so, please be sure costs for its demolition
and removal are included in the reclamation bond estimate in Exhibit L.
Response: At this time PAO has decided not to install any conveyor from the
wash plant to the south and it has been removed from the map. If PAO decides to
install any conveyor in the future PAO will submit a technical revision to the
permit including details of any required demolition of conveyor structures, and
estimated reclamation bond costs for its demolition and removal.
Exhibit G-Water Information (Rule 6.4.7):
26) The application includes two letters from the Division of Water Resources (DWR), dated
February 16, 2015 and January 31, 2018, approving installed liners at this site after their
office reviewed the results of the 90-day performance tests. Please confirm these letters
are pertaining to the two slurry wall enclosures in the North Mining Area depicted on the
Exhibit C- Pre-Mining/Mining Plan Map.
Response: Yes, the liner approval letters are for the Phase 1 and Phase 2 slurry
walls, both located in the North Mining area.
27) In the letter from the DWR, dated January 31, 2018, Item #3 specifies that additional
information is required to be submitted prior to the lined reservoir being used for storage of
water. During the Division's June 14, 2018 inspection, the first slurry wall enclosure
(Phases 1-4) was filled with water. Please clarify whether the DWR has been informed of
this use, and if all required information for this use has been submitted to their office.
Response: The January 31, 2018 letter, Item #3 is referring to the Phase 2 slurry
wall enclosure which surrounds the second north mining area reservoir cell. The
mining of this cell is ongoing and has not been completed. No water has been
stored in this cell to date. The information required in Item #3 will be provided to
the DWR prior to storing any water in that cell.
The first slurry wall enclosure has water stored in it. The DWR has been notified of
this use and requires that monthly water balance accounting is submitted to them
for this cell. See the attached accounting spreadsheet that is submitted to the
DWR monthly.
28) The application includes a copy of the discharge permit obtained from the Colorado
Department of Public Health and Environment (CDPHE) for two defined discharge points,
Outfall #001-A and Outfall #002-A. Please provide a map of the site (large format not
V 305 Denver Avenue-Suite D•Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: [phone]