HomeMy WebLinkAbout912027.tiff •
10QII Waste Management of North America,Ino.
.NaOr Mountain Region
5660 Greenwood Plaza Blvd.•Englewood,Colorado 80111
Suite 4244303/770-3324
December 9,1991
•
•
Mr.Rod Allison
Weld County Department of Planning Services
915 10th Street,Room 342
Greeley,CO 80631
SUBJECT: NORTH WELD SANITARY LANDFILL •
Dear Mr.Allison: - -
•
Enclosed is a letter to Mr.Wes Potter,Director of Environmental Services,Weld County
Health Department,which describes two minor changes associated with construction of the
clay liner at the North Weld Sanitary Landfill(NWSL). In accordance with Section 34 of
the Certificate of Designation Approval Development Standards for the NWSL,Waste
Services Corporation(WSC)an affiliate of Waste Management of Colorado,Inc.hereby
files these changes with the Weld County Department of Planning Services. The changes
consist of the following:
1. Modifying the QA/QC testing frequency from 1 test per 100-foot spacing for each
6 inch lift of liner material to 1 test per 370 cubic yards of liner material.
2. Modifying the moisture content specification from 0 to 4 percent of optimum
moisture content to-2 to+2 percent of optimum moisture content.
•As you will note,these changes are supported by ATEC Associates,Inc.,the independent
QA/QC project consultant. Also as referenced in the enclosed,we have reviewed these
items Mr.Potter and Ms.Austin Buckingham,Colorado Department of Health,who have
concurred with the changes.
Please call me should you have any questions about the enclosed.
Sincerely,
Tom Schweitzer,.P.E. .
Environmental Engineering Manager
ro
91202.1 -:
PL-017-1
Letter to Rod Allison
December 9, 1991
Page 2
TS/mak
Enclosures
cc: Bill Hedberg, WSC w/o enclosures
Brad Keirnes, WSC w/o enclosures
f:\ts\120991L1.doc
/Qii. Waste Managementorth America.Inc. .
lieMountain Region
5660 Greenwood Plaza Blvd.•Englewood.Colorado 80111
Suite 424.303/770-3324 •
November 19, 1991
Mr. Wes Potter ,
Director of Environmental Protection Services
Weld County Health Department
1517 16th Avenue Court
Greeley, CO 80631
SUBJECT: NORTH WELD SANITARY LANDFILL (NWSL)
Dear Mr. Potter:
This letter is intended to summarize our meeting of November 13, 1991 regarding two minor
changes recently identified by Waste Services Corporation (WSC), an affiliate of Waste
Management of Colorado,Inc.,pertaining to the NWSL clay liner construction project which
is nearing completion. The two changes pertain to QA/QC testing frequencies for field
moisture/density and moisture content specifications for clay liner placement. The following
information in support of these changes is attached:
Attachment 1 Excerpts from the Development Standards included as part of the
Certificate of Designation (CD) Approval by the Weld County Board
of Commissioners
Attachment 2 Summary of QA/QC observation and testing frequencies for the clay
liner construction prepared by ATEC Associates, Inc. (ATEC), the
independent QA/QC project consultant
Attachment 3 Summary Table which compares the testing program used for this
project and the program identified in the CD Development Standards
Attachment 4 Moisture content recommendations for clay liner placement by ATEC
QA/OC TESTING FREQUENCIES FOR FIELD MOISTURE AND DENSITY
In Attachment 1, section 7d of the CD Development Standards states that testing shall be
preformed "at no less than a 100-foot spacing for each six-inch lift of liner material". The
frequency used for this project was 1 test per 370 cubic yards of liner material which
approximately equates to a 142-foot spacing for each six-inch lift. Although a literal
comparison between the two frequencies indicates that the frequency used for this project
complies with the CD requirement, we believe the intent of the CD requirement is that
testing should be performed at intervals no greater than 100 feet.
D a
Letter to Wes Potter
November 19, 1991
Page 2
WSC believes the QA/QC testing program implemented for this project is sufficient to
provide the necessary assurances that the liner was constructed in accordance with the
specifications identified in the CD. In support of this position, the following is provided:
• Prior to construction and as discussed in Attachment 2, test fills were constructed
using onsite, representative materials under the supervision of an ATEC
representative to verify materials suitability and performance. As shown in
Attachment 3, this testing included 160 field moisture and density tests, 12 particle
size tests, 12 Atterberg Iimits tests, 12 Proctor tests, and 12 laboratory permeability
with moisture/density tests. During testing,parameters such as moisture content and
the number of equipment passes over the liner material were varied and the
performance (e.g. permeability) of the material was then determined. This testing,
which is in addition to the requirements of CD Development Standards, increased
the level of confidence in the material and established the parameters by which
construction of the liner was undertaken.
• During construction, laboratory permeabilities with moisture/density testing were
conducted. As shown in Attachment 3, this testing was performed at the frequency
of 1 test per 5000 cubic yards of liner material used. This testing is also in addition
to the requirements set forth in the CD Development Standards.
MOISTURE CONTENT SPECIFICATIONS FOR CLAY LINER PLACEMENT
Section 7b of the CD Development Standards states that "the moisture content of the
material shall be maintained from zero to four percent of the optimum moisture content".
The moisture content used for this project ranged from -2 to +2 percent of the optimum
moisture content. As previously stated and as discussed in Attachment 4, test fills were
constructed prior to liner placement to verify suitability and performance of the liner
material. During testing, moisture content was varied and resulting permeabilities were
determined. Based on the test fill results, ATEC determined that to meet permeability
specifications the moisture content range for clay liner placement should be from -2 to +2
percent of optimum moisture content.
In consideration of the above points supporting these two changes,you concurred during our
November 13 meeting that the QA/QC frequency of 1 test per 370 cubic yards for field
moisture and density and the moisture content range of -2 to +2 percent of optimum
moisture content were appropriate for this project. I discussed these changes with Ms.
Austin Buckingham, Colorado Department of Health (CDH), by telephone on November
15, 1991. Based on my description of the changes,Austin did not envision any concerns with
the changes. By copy of this letter, I am forwarding the enclosed support information to
Austin. In addition, I am also sending a copy of this letter to.the Weld County Department
Pc;
Letter to Wes Potter
November 19, 1991
Page 3
of Planning Services as required by Section 34 of the CD Development Standards which
requires that such changes be filed with this Department.
At your earliest convenience, I request written confirmation from Austin and you regarding
your concurrences with these changes. Should you or Austin have any questions or require
additional information, please call me.
Sincerely,
Tom Schweitzer, P.E.
Environmental Engineering Manager
Enclosures
TS/mak
cc: Austin Buckingham, CDH
Rod Allison, Weld County Department of Planning Services
Bill Hedberg, WSC
Brad Keimes, WSC
Steve Kuehr, ATEC
f:\ts\111891L1.doc
r
art i ,, Telefax Numbers:
$3°x. 1�tA paf' Main Building/Denver cle
� bc ,:: (303)322-9076
3fi
to.P 4210 East 11th Avenue Ptarmigan Place/Denver ROY ROMER
'• `'` (303) 320-1529 Governor
Denver, Colorado 80220-3716
Phone (303) 320-8333 First National Bank Building/Denver
(303)355.6559 JOEL KOHN
,I !4t Grand Junction Office Interim Executive Director
COLORADO 1M (303)248-7198
1.1/1AJi�tiW Pueblo Office
DEPARTMENT (719)543-8441
OFAHEALTH
December 3 , 1991 "' !L
J
Tom Schweitzer, PE
Waste Management of North America, Inc. �_� 0 �? 1991
Mountain Region
5660 Greenwood Plaza Blvd. 'Sl�(F`•'�'t"9
Weld�e�s^.•
Englewood, Colorado 80111
RE: QA/QC Clay Liner
North Weld Sanitary Landfill
Weld County, Colorado
Dear Mr. Schweitzer:
The Hazardous Materials and Waste Management Division (the
Division) of the Colorado Department of Health has reviewed
your November 19, 1991 submittal regarding modifications to
the North Weld Sanitary Landfill clay liner moisture/density
testing frequency and moisture content.
Based on the information provided, the Division finds that
the proposed testing frequency and moisture content are
adequate to ensure that the clay liner will be placed
according to the designed permeability. Therefore, the
modifications are deemed to be sufficient.
Please contact me at this office, if you have any additional
questions.
Sincerely,
G_
Austin N. Buckingham
Geologist
Solid Waste and Incident Management Section
Hazardous Materials and Waste Management Division
cc: R. Allison, Weld County Planning Department
W. Potter, Weld County Health Department
file: WLD/NOR
1 MAQ 16, 1988 SCRAP TIRE RECYCLINGQGULATION
•=v) 2
3 Statement of Basis and Purpose
4
5 Colorado's scrap tire problem is indeed serious. Over 2 million tires are
6 discarded each year and only a small .portion are recycled or retreaded. Most
7 tires are placed in ever-growing stockpiles and others are burned, buried or
8 illegally dumped. A tire stockpile fire in Hudson in June, 1987, burned for
9 four days releasing noxious smoke and toxic gases and contaminated soils. .
10 This fire cost on the order of $100,000 to extinguish. Scrap tire stockpiles
11 are known to provide prolific breeding habitats for infectious disease
12 carriers such as mosquitoes and rats.
13
14 Currently, stockpiling of scrap tires is uncontrolled and little incentive
) 15 exists for recycling. These regulations, which were developed by a
16 broad-based committee consisting of tire stockpilers, disposers, recyclers,
17 landfill operators and local and state health officials, are aimed at
18 mitigating adverse effects from scrap tire piles. The issues addressed by the
19 regulations include safe storage practices such as adequate security, access,
20 communication abilities, signage, emergency contacts, submittal of a tire fire
21 plan, and evidence of recycling;activities.
22
23 Tire stockpiles less than 10,000 in number, those that are generally
24 maintained by tire retailers and tire retreaders, generally do not present the
25 serious problems that larger stockpiles present. It is the Department's
26 position that these stockpiles should not be required to obtain Certificates
,27 of Designation unless public health or environmental problems are occurring.
ATTACHMENT 2
ATEC Assoctes, Inc. .o - .. . . _
• V 7000 East 47th Avenue Drive,Suite 900
Denver,Colorado 80216
[303]377-2832, FAX # [303]377-2873
November 13, 1991
Waste Management of Colorado
5660 Greenwood Plaza Boulevard, Suite 424
• Englewood, CO 80111
Attn: Mr. Tom Schweitzer, P.E.
Subject: Summary of QA/QC Observation and Testing
Clay Liner Construction
North Weld County Sanitary Landfill - Module 1
ATEC Project No. 41-123064
Gentlemen:
ATEC Associates, Inc. (ATEC) has provided QA/QC.services for clay liner construetion at
the subject site. Test fills of the liner material were conducted in order to evaluate the
acceptable range in moisture; density and compactive effort which would provide the
required laboratory vertical hydraulic conductivity. Results of the test fills showed that the
required parameters were being achieved with as few as two (2) complete coverages (passes)
of the compactor.
During construction, the liner material was monitored with a series of tests to verify the
. materials suitability and performance. Particle size (ASTM D1140) tests were performed
for each 1,000 cubic yards of material. Atterberg limits (ASTM D4318) and moisture-
density relationships (standard Proctor, ASTM D698) tests were performed for each 3,000
cubic yards. Laboratory vertical hydraulic conductivity tests(ASTM.D5084)were performed
for each 5,000 cubic yards of in place liner. As of this date, test results are available for five
(5) out of a total of nine (9) of the hydraulic conductivity samples. The results show that
all the tested samples were less permeable than the maximum allowable specified value.
The contractor was required to make five (5) complete passes with his compaction
equipment for each.six (6) inch lift. Number of passes and lift thicknesses were observed
in the field by ATEC's resident engineer. Field moisture content/density tests (ASTM
D2216/D2922 and D1556) were performed for each 370 cubic yards of material placed. In
the few instances where the moisture or density was insufficient, the contractor was directed
to rework the entire area represented by the failing test and subsequent tests showed passing
results.
•
•
•
•
A Subsidiary of American Testing and Engineering Corporation Consulting Environmental, Geotechnica/and
Offices in Major U.S.Cities/Since 1958 Materials Engineers
. t .
C
' Waste Management of Colorado
November 13, 1991
Page 2 .
•
This QA/QC approach establishes performance criteria during the test fill. Field
observation verifies that the criteria established from the test fill were utilized during
construction. The field observations are supplemented by moisture content density and •
laboratory vertical hydraulic conductivity tests to verify the anticipated results. It is our
opinion that the amount of observation and testing is adequate to provide the level of
confidence in day liner performance as intended by the Certificate of Designation.
We are happy to be of continued service to you on this project. Please contact the
undersigned if you have any questions.
Very truly yours,
ATEC ASSOCIATES,"ca., \ BOup Eipiii//e,„
of PROF%
♦\\ fc.oir /i / . air,
. d
..0. O
a, 0
90- le. ....
6713 a
Steven C. Kuehr, P.E. a 24369 i - Donald R Ganser, C.P.
Senior Project Engirt .. ;4, District M ---anager
tiummittO R?aarisiar.«
cc: Mr. F. Glen Odell, P.E.
=MOMENT• 4
• ATEC AssociGtesI Inc. a
v 7000 East to7 o 8021 Drive, Sutte 900 •
V Denver, Colorado 802'IB
(3031377-2832, FAX# [3031 377-2873
•
• November 13, 1991 •
Waste Management of Colorado
5660 Greenwood Plaza Boulevard, Suite 424
Englewood, CO 80111 •
Attention: Mr. Tom Schweitzer, P.E.
•
Subject Moisture Content for Clay Liner Placement
North Weld County Sanitary Landfill - Module 1
ATEC Project No. 41-12306
Gentlemen:
ATEC Associates, Inc. (ATEC) has conducted clay liner test fills, associated laboratory
testing and observed and tested clay liner construction for the above referenced project.
The attached laboratory test results provide the relative compaction,,optimum moisture
• content (ASTM D698) and as-compacted moisture content for 12 "undisturbed" thin wall
tube samples obtained from the test fills. It can be seen from these data that 8 of the 12
test fill samples were less permeable than the construction specified maximum laboratory
vertical hydraulic conductivity of 1 X 10.7 centimeters per second (cm/s). The moisture
content for these samples ranged from 7.4 percent below optimum to 2.1 percent below
optimum. The remaining four test fill samples which did not meet the construction specified
laboratory vertical hydraulic conductivity requirement had as-compacted moisture contents
ranging from 6.4 percent below optimum to 3.1 percent below optimum.
Based upon the test fill results it was determined that to meet the specifications for
laboratory vertical hydraulic conductivity the moisture content range for clay liner placement
during construction should be within -2 to +2 percent of the optimum moisture content at
the specified minimum density of 95 percent standard proctor (ASTM D698) maximum dry
density. We are happy to be of continued service to you on this project. If you have any
questions, please contact the undersigned.
Very truly yours,
•
ATEC ASSOCIATES, II��ul�aumunnrrru/rr r.
• Pp9 ((CCr/S'.,,.
c,...44:10. r kGe4o.cv A� EOf PROF
Steven C. Kuehn P.E! r� r = v�°� w''o
Senior Project Engine�'y's 24369 •C= Donald R. Gasser, C �7; : � t'+die+,��
z District Manager ci 6711 •\ %
SCK/Idf ' -k„ ionrit •
...........\s —.
\\\ • t N
Attachment "'rrtanuum�ao
11O'41 Ot3
cc: Mr. F. Glen Odell, P.E. PROFESSIOOL
A Subsidiary of American Testing and Engineering Corporation Consulting Environmental,Geotechnical and
Offices in Major U.S.Cities/Since 1958 Materials Engineers
e \
DEPARTMENT OF PLANNING SERVICES
PHONE(303)356-4000,EXT.4400
91510th STREET
' GREELEY,COLORADO 80631
•
COLORADO
October 3, 1991
Brad Keirnes, General Manager
Waste Services Corporation
6037 77th Avenue
Greeley, CO 80631
Subject: Clarification of soil storage area for overburden excavated in
association with Special Review Permit Number 895, located in part
of the SW4 of Section 7, T7N, R66W of the 6th P.M. , Weld County,
Colorado.
Dear Brad:
Thank you for the September 30 letter clarifying the height of the soil storage
area. The information presented is not considered a major change from the plans
or development standards as approved by the Board of County Commissioners. The
soil storage area shall parallel the north property line of the special review
permit area and it will be a maximum three hundred (300) feet wide and fifty (50)
feet in height.
Please call or write if you have any questions.
Sincerely,
Rod Allison
Principal Planner
RDA/sfr
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Sot L STotAGE AREA
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y
Waste Services
CORPORATION
September 30 , 1991 •
Rod Allison
Department of Planning Services
Weld County
910 10th Street
Greeley, Colorado
Re: Clarification of Request Dated September 23 , 1991
Dear Mr. Allison:
This letter serves to clarify my request, dated September
23 , 1991 , for your consent to establish a supplementary soil
storage zone along the north perimeter of the North Weld
Sanitary Landfill.
Upon our receipt and review of your consent to this request
limiting the stockpile area to 25 feet in height, our
technical staff informed me that the adequacy of the 300
foot width we specified was based on an assumed soil
stockpile height of 50 feet above existing topography.
These dimensions were calculated based on the total quantity
of material for which additional storage area is required.
In defining a supplemental area to meet this need, our
engineers sought to minimize the consumption of productive
dry land on our adjacent property while still limiting the
stockpile to a height that will be fully screened from view
by our extensive landscaped berming along Highway 14 .
As I indicated to you this morning on the telephone, a
stockpile height of 50 feet in this area will be fully
shielded from view by our landscaped berming. Also, for
your information, the approved final elevation for the
landfill area along our north site boundary is a minimum of
75 feet above existing topography, or at least 25 feet
higher than the 50 foot stockpile height that is necessary.
Therefore, we request your revised consent to a stockpile
height of 50 feet. I apologize for any inconvenience I may
have caused you. Thank you again for your assistance with
the proper planning and monitoring of this facility.
Sincerely,
C. Bradley Keir
General Manager
cc: Wes Potter, Weld County Health Department
6037 SEVENTY-SEVENTH AVENUE • GREELEY, COLORADO 80634 • (303) 330-2641
Di or
DEPARTMENT OF PLANNING SERVICES
PHONE(303)3564000,EXT.4400
915 10th STREET
IGREELEY,COLORADO 80631
C.
COLORADO
September 24, 1991
Brad Keirnes, General Manager
Waste Services Corporation
6037 77th Avenue
Greeley, CO 80634
Subject: Soil storage area for overburden excavated in association with
Special Review Permit Number 895, located in part of the SW4 of
Section 7, T7N, R66W of the 6th P.M. , Weld County, Colorado.
Dear Brad:
Thank you for the September 23 letter and map describing the supplemental soil
storage area. The information presented is not considered a major change from
the plans or development standards as approved by the Board of County
Commissioners. Based upon today' s telephone conversations and submitted
information, the soil storage area shall parallel the north property line of the
special review permit area and it will be a maximum three hundred (300) feet wide
and twenty-five (25) feet in height.
Please call or write if you have any questions.
Sincerely,
/paean—
Rod Allison
Principal Planner
Waste Services
CORPORATION
September 30 , 1991
Rod Allison
Department of Planning Services
Weld County
910 10th Street
Greeley, Colorado
Re: Clarification of Request Dated September 23 , 1991
Dear Mr. Allison:
This letter serves to clarify my request, dated September
23 , 1991 , for your consent to establish a supplementary soil
storage zone along the north perimeter of the North Weld
Sanitary Landfill.
Upon our receipt and review of your consent to this request
limiting the stockpile area to 25 feet in height, our
technical staff informed me that the adequacy of the 300
foot width we specified was based on an assumed soil
stockpile height of 50 feet above existing topography.
These dimensions were calculated based on the total quantity
of material for which additional storage area is required.
In defining a supplemental area to meet this need, our
engineers sought to minimize the consumption of productive
dry land on our adjacent property while still limiting the
stockpile to a height that will be fully screened from view
by our extensive landscaped berming along Highway 14 .
As I indicated to you this morning on the telephone, a
stockpile height of 50 feet in this area will be fully
shielded from view by our landscaped berming. Also, for
your information, the approved final elevation for the
landfill area along our north site boundary is a minimum of
75 feet above existing topography, or at least 25 feet
higher than the 50 foot stockpile height that is necessary.
Therefore, we request your revised consent to a stockpile
height of 50 feet. I apologize for any inconvenience I may
have caused you. Thank you again for your assistance with
the proper planning and monitoring of this facility.
Sincerely,
C. Bradley Keir
General Manager
cc: Wes Potter, Weld County Health Department
6037 SEVENTY-SEVENTH AVENUE • GREELEY, COLORADO 80634 • (303) 330-2641
-ce
•
Waste Services
CORPORATION
September 23 , 1991
Rod Allison
Department of Planning Services
Weld County
910 10th Street
Greeley, Colorado
Re: Storage of Soil at the North Weld Sanitary Landfill
Dear Mr. Allison:
As we discussed today by telephone, Waste Services
Corporation has determined the need to have supplemental
soil storage area for overburden being excavated at the
North Weld Sanitary Landfill. This need has arisen due to
the total quantity of material initially being excavated and
our preference to limit the height of our soil stockpiles so
as to minimize any potential negative impacts from our
operations .
To best meet this need, we intend to stockpile this
additional material on adjacent property we own in a 300
foot wide storage zone parallel to our north site boundary
line (see attached map) . This stockpile area will be
maintained in the same manner as proposed and approved as
part of the Design and Operations Plan, Use by Special
Review Permit and Certificate of Designation for this
facility.
We request your consent to this action at your earliest
convenience so as to facilitate the efficient construction
and operation of this facility.
Thank you for your consideration and ongoing assistance.
Sincerely,
C. Bradley K it es
General Manage
CBK/kbc
enc.
cc: Wes Potter, Weld County Department of Health
6037 SEVENTY-SEVENTH AVENUE • GREELEY, COLORADO 80634 • (303) 330-2641
ast tsg - t.rvkes
CORPORATION
July 15 , 1991
Board of Weld County Commissioners JUL 15 RECD
915 10th Street
Greeley, CO 80631
Dear Commissioners :
I wish to take this opportunity to inform you that effective'
July 12, 1991 , Waste Services Corporation has merged with
Waste Management of Colorado.
This action was taken to enable Waste Services Corporation
to continue our commitment to meeting Weld County' s solid
waste management needs in a more comprehensive manner.
As a small family business , we determined that we needed
additional resources and means to do so, as well as to meet
the increasing regulatory, financial and competitive demands
of our industry.
Upon realizing our limitations , we sought and selected the
company whom we believe is best committed to the same
principles by which we have done our best to conduct our
business . We believe that the addition of Waste
Management' s expertise and strength to Waste Services '
ongoing operations will result in our continuation of what
we trust has been cost-effective and environmentally-sound
service to our customers and to Weld County.
Waste Services Corporation will continue in its ownership ,
development and operation of the Central Weld and North Weld
Sanitary Landfills . I intend to continue in my present
management role.
If you have any questions about this matter, I would b,e
happy to try to answer them at your convenience. Thank you.
Res ectfully,
C. Bradley Keirnes
President
CBK/kbc
cc : Don Warden
Wes Potter
Rod Allison
Lee Morrison
6037 SEVENTY-SEVENTH AVENUE 0 GREELEY, COLORADO 80634 • (303) 330-2641
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