HomeMy WebLinkAbout941733.tiff STATE OF COLORADO
DIVISION OF MINERALS AND'GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver,Colorado 80203
Phone:(303)866-3567
FAX:(303)832-8106 ' DEPARTMENT OF
11gTT— NATURAL
August 3 , 1994
AUG 0 9 1994 RESOURCE
Mr. John G. Jordan 4 Roy Romer
Tuttle Applegate, Inc. "f4dNIO r ,i94v Planning c°"ernor
11990 Grant Street, Suite 410 James S.Lochhead
Executive Director
Denver, CO 80233
Michael B.Long
Division Dtreclor
RE: Inert Fill Disposal , Andesite Rock Company, Del Camino Pit,
Technical Revision TR-001, File No. M-79-0e3R
Dear Mr. Jordan:
The Division of Minerals and Geology (Division) has reviewed the above
referenced technical revision application. There are a number of items
which must be addressed before the Division can act on the application.
1. The current Memorandum of Understanding (MOU) between the Colorado
Department of Health, Hazardous Materials and Waste Management
Division (CDOH) and the Division specifies that any facility which
imports waste from off-site locations must obtain a Certificate of
Designation (CD) under the Solid Waste Disposal Facilities Act
(SWDFA) . A draft guidance document circulated by CDOH indicates
that a CD may not be required at mine sites permitted by the
Division for inert fill in areas less than 20 acres or less than
1, 000 , 000 cubic yards of fill, however, the MOU has not been
modified to incorporate this proposed policy. As a result, the
Division will require that the applicant obtain a CD from CDOH, or
documentation that the need for a CD has been waived, prior to
importation of inert fill onto the permit area. The applicant
must provide a copy of the CD or waiver for the Division' s files .
2 . The Division has been in contact with Weld County Planning and
Engineering, and they have expressed an interest in this technical
revision application. The Division is forwarding a copy of the
application, and of this letter, to Weld County, and soliciting
their comments . This is in accordance with the CDOH draft
guidance document which states "All proposed inert disposal sites
must be reviewed by the local governing land use and zoning
authority" .
4 . The Division will require that certain controls be put in place
for a gravel pit that will be accepting inert backfill . If these
requirements are in any way duplicated or superseded by the
requirements of a CD obtained for the site, the applicant may
propose modifications to the Reclamation Permit requirements to
bring them in line with the terms of the CD.
51-1113
IL03 -
Letter to John Jordan 2 August 1, 1994
a) The applicant must commit to specific site access
restrictions . Locking gates must be installed at all access
points and the gates must be securely locked when mine
personnel are not on site. The applicant must commit to
placing "No Unauthorized Dumping" and "No Trespassing" signs
at 100 foot intervals along the fence. The gates, fence, and
signs must be maintained in good condition throughout the
life of the mine.
b) A groundwater monitoring program will be required in order to
permit disposal of inert fill at this site. At a minimum, a
sufficient number of up gradient and down gradient monitoring
wells must be installed in the alluvial aquifer to assure
that degradation has not occurred across the permit area.
Prior to approval of the technical revision TR-001, the
applicant must submit:
i) A map that accurately locates all proposed groundwater
sample points and any locations that are proposed as points
of compliance.
ii) A proposal for method of sampling, and frequency of
sampling and reporting to the Division.
iii) A proposal for parameters to be analyzed, and a
description of water quality analysis methods to be utilized
as well as quality control and quality assurance methods.
iv) A description formations, aquifers or strata to be
sampled.
v) Identify the locations proposed for inert fill disposal in
relation to the locations proposed for down gradient
monitoring.
The nature of the local hydraulic gradient must be quantified
through piezometric data from the wells once there locations
have been approved and the wells have been installed.
Additional wells may be required based on the piezometric
data if pre-installation assumptions about hydraulic gradient
are not upheld by the data. The Division will require that
boring profiles and well completion schematics be provided as
they become available, and will require that sufficient
groundwater baseline information be collected prior to
placement of off-site inert fill. The wells would have to be
monitored for a minimum of five years after final placement
of the fill, and if analysis suggests that the inert fill
operation has contaminated groundwater, the source of
contamination would have to be located and eliminated.
Letter to John Jordan 3 August 1 , 1994
5 . The applicant must commit to placement of only well graded fill
into the pits. An adequate degree of compaction must be provided
to assure long-term stability of the back -filled slopes. It may
be necessary to windrow and blend the fill materials, particularly
when concrete or asphalt rubble is included, in order to assure
that the fill is well graded.
Please address each item on the foregoing list prior to the September
15, 1994 decision date as granted as an extention date by the Division
for technical revision TR- 004 . If you are unable to comply with this
time constraint, a written request for an additional decision date
extension would be required to. avoid revision denial .
If you have any questions, or if I may be of any assistance, please do
not hesitate to contact me.
Sincerely,
viLL'Llra "1-AA')U2
Gregg R. Squire
Reclamation Specialist
cc: Glen Mallory, CDOH
Gloria Dunn - Weld County Department of Planning Services
Weld County Adminstrative Offices
1140 N. 17th Ave.
Greeley, CO 80631
M:bealeverieL.Lr
Min
ThttieApplegate,1nc1
Consultants for Lend.Mineral and Water Development
July 5, 1994 RECEIVED
JUL 61994
Nlr. Carl B. Mount Oivlsion nt +Tinerdis Ueoiogy
Division of Minerals and Geology
1313 Sherman Street, Room 215
Denver, CO 80203
-7-7e-661
RE:"Technical Revision'to mining permit M-79-083 K
Dear Mr. Mount:
On behalf of Andesite Rock Company we are submitting a Technical Revision to their Del
Camino.(M-79-083)'sand and grave l mining operation, Andesite would like to backfill this
pit with inert material. ',•In order to for avoid a Certificate of Designation, Andesite wilI stay
within the limits described by policies of the Colorado Department Of Health.. The revision
involves the adjustment to Exhibit D (Mining Plan) in the mining permit. The following
should be inserted in Exhibit D of the Del Camino permit application:
Material of an "inert nature" will be disposed of into the pit to backfill slopes and
• complete the reclamation plan. Inert material will be classified as non-water soluble
and nonputrescible solids together with such minor amounts and types of other
materials as will not significantly affect the inert nature of such solids according to
rules and regulations of the Colorado Department of Health and the Board of Health.
Inert material includes, but is not limited to, earth, sand, gravel, rock, concrete which
has been in an hardened state for at least 60 days, masonry, asphalt paving fragments,
and other inert solids including those the Board of Health may identify in regulation.
Inert fill material will also be restricted to area and volume as described by the
Colorado Department of Health. The area to fill will be less than 10 acres and no
more the 500,000 cubic yards in volume.
814173
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11990 Grant Street, Suite 410•Denver,'Co3orado 80233 (303)452-6611 •Fax(303)452-2759
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Mr. Carl'B. Mount
' Division of Minerals & Geology •
July 5, 1994
Page 2
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A•check for $150.00 dollars has been enclosed for the processing of this Technical Revision,
• Andesi:te understands it will take up-to 30:days•to process a Technical Revision. If,you have
-any questions regarding this submittal.af this Technical'Revision please give us a call. Thank
you for your time and consideration In this matter.
Cordially,
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T J . AP ATE
. ohn C�:'Jordan
Hydrogeologist
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cc File`#93 180TR .
• •' Denny, Staehell, Anilesite Rock Company. - •
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