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STATE OF COLORADO
Bill Owens,Governor cold
Jane E.Norton,Executive Director �.�`�q\
Dedicated to protecting and improving the health and environment of the people of Colorado ye ri,1
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HAZARDOUS MATERIALS AND WASTE MANAGEMENT DIVISION * i* "
http://www.cdphe.state.co.us/hm/ ‘!°'11376_,-
4300 Cherry Creek Dr.S. 222 S.6th Street,Room 232
Denver,Colorado 80246-1530 Grand Junction,Colorado 81501-2768 Colorado Department
Phone(303)692-3300 Phone(970)248-7164 of Public Health
Fax(303)759-5355 Fax(970)248-7198 and Environment
Weld C
November 20, 2000 Ouflty PI ,-1 n
g
Dept.
NOV 2 3 2000
Mr. Alan Scheere Mr. Bill Hedberg
Waste Management ^ R E C E North Weld Sanitary Landfill
2090 E. i 04 Av'. #300 V E® 40,000 We'd Ccun y Road 25
Denver, CO 80233 Ault, CO 80610-9748
RE: North Weld Sanitary Landfill Phase 1 —Module 5 Design Package (Revision 2)
Dear Mr. Scheere and Mr. Hedberg,
I am responding to your October 12, 2000 letter and the enclosed North Weld Sanitary Landfill
(NWSL) revised design submittal listed below:
• Phase 1 —Module 5 Construction Plans (drawings revised October 2000)
• Technical Specifications for Phase 1 —Module 5 Cohesive Soil Liner and Leachate
Collection System (revised October 2000)
• Phase 1 —Module 5 Liner System Construction Quality Assurance Plan(revised October
2000)
• Phase 1 —Module 5 Detention Pond Drawing No. 1 (revised October 2000)
• Section III Technical Specifications and Quality Assurance Plan for Construction of Storm
Water Pond(revised October?non)
In consultation with the Weld County Department of Public Health and Environment, I offer the
following comments regarding the above documents:
Phase 1 —Module 5 Construction Plans
Based on our November 16, 2000 meeting, it is understood that"K< 1X10-7 SEC/CM"noted on
Drawing 6 Detail 2 (Leachate Sump Detail) should instead read "K< 1X10-7 CM/SEC." With
this understanding, the Phase 1 —Module 5 Construction Plans (drawings revised October 6,
2000) are approved.
200033%3
Mr. Alan Scheere and Mr. Bill Hedberg
November 20, 2000
Page 2
Technical Specifications for Phase 1 —Module 5 Cohesive Soil Liner and Leachate Collection
System
The Technical Specifications for Phase 1 —Module 5 Cohesive Soil Liner and Leachate
Collection System (revised October 2000) are approved. However, where applicable, it is
recommended that future specification submittals more explicitly address the permanent sump 5'
horizontal perforated pipe section and the solid wall riser pipes (as shown on Drawing 6).
Phase 1 —Module 5 Liner System Construction Quality Assurance(CQA) Plan
The Phase 1 —Module 5 Liner System Construction Quality Assurance Plan(revise-I Oe*ober
2000) is approved. However, where applicable, it is recommended that future CQA plan
submittals more explicitly address the permanent sump 5' horizontal perforated pipe section and
the solid wall riser pipes (as shown on Drawing 6). And, please include a future CQA plan
requirement that quality control certificates for all high density polyethylene pipes shall be
included in an appendix to the construction documentation report. Also, please include a future
CQA plan requirement that the record survey to be performed by a Colorado registered
professional land surveyor will include the temporary sump top of clay backfill (i.e., outside the
trench).
Phase 1 —Module 5 Detention Pond Drawing No. 1
In deference to Colorado Department of Transportation(CDOT) concerns regarding NWSL
storm water discharge onto CDOT right of way, we are unable to approve this drawing. Also,
this drawing does not appear to be properly sealed.
Section III Technical Specifications and Quality Assurance Plan for Construction of Storm
Water Pond
Our office did not receive a document(revised October 2000) entitled"Section III Technical
Specifications and Quality Assurance Plan for Construction of Storm Water Pond". Instead, we
received a document entitled"Technical Specifications and Quality Assurance Plan for
Construction of Stormwater Pond." Contrary to the title, this document appears only to contain
specifications. Nevertheless, in deference to Colorado Department of Transportation(CDOT)
concerns regarding NWSL storm water discharge onto CDOT right of way,we are unable to
approve this document(which references the above drawing). Moreover, this document also
does not appear to be properly sealed.
Based on our November 16, 2000 meeting, it is my understanding that a revised run-on and run-
off control system design submittal is forthcoming. Please submit a drawing(s), specifications
and a comprehensive CQA plan that address construction of this required control system. It is
recommended that the CQA plan format be similar to that of previous CQA plan submittals.
J < - P
Mr. Alan Scheere and Mr. Bill Hedberg
November 20, 2000
Page 3
In closing, the Hazardous Materials and Waste Management Division of the Colorado
Department of Public Health and Environment (Division) is required to bill for its review of
technical submittals, pursuant to CRS 30-20-109(2)(b). An invoice for the Division's review of
the above submittals is included with this letter.
Please contact me at 303-692-3389 if you have any questions.
Sincerely,
bow 74/t.. a24-.1UAAAr
Douglas M. Ikenberry
Solid Waste Unit
Compliance Program
Enclosure
Cc: Julie Chester, Weld County Department of Public Safety
Cindi Etcheverry, Weld County Department of Public Health and Environment
David J. Moores, P.E., Colorado Department of Transportation
FILE: SW WLD NWC 2.2
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