HomeMy WebLinkAbout20021276.tiff St. Vrain Archers and Bowhunters Association
November 30, 2001
St. Vrain Archers and Bowhunters Association
C/O Dr. Roger Trudell
• 412 Main Street
Longmont, CO 80501
Weld County Planning Department
1555 N. 17 Avenue
Greeley, CO 80631
Re: Soils Report
Dear Planning Department, County Planning Commission and Board of County
Commissioners:
There is no soil under the current landfill so an official soils report would not be
feasible. There is approximately two feet of topsoil cover over the landfill.
Attached is the "Estimated Disposal Volume" from Doty and Associates,
Environmental Engineers, of what is under the landfill site.
Sincerely,
ier
Dr. Roger Trudell
President, St. Vrain Archers and Bowhunters Association
EXHIBIT -
2002-1276 1 T
NOV-02-01 FRI 10:47 AM FAX NO, P. 02
1.)0'i Y & ASSOCIATES
IINVIRONMPNI AL,GROUND-WAIPR AND WASTE MANAGEMENT ENGINEERS
MCA 11,1)1 IWN(;AI I'CANYON ROAD
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111.1I91ONI 1703)219 9161
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August 8, 1999
1207-04
Mr. . Richard Lee
Sanitation Supervisor
City of Longmont
Public Works Operations
375 Airport Road
Longmont, Colorado 80503
Subject: Estimated Disposal Volume
Longmont Landfill
Dear Mr. Lee:
This letter presents an estimate of the volume of waste
currently in-place at the above referenced site.
The volume estimate was prepared using our topographic model of
the current site conditions and a newly developed model of the
base of refuse. The current topography (Figure 1) is based on
a scan of the topographic map prepared in 1983 and a scan of the
final grading plan. It is a reasonable representation of
current conditions, but must be considered an estimate because
an an-built topographic map was not prepare'. The base of
refuse model (Figure 2) is based on a scan of the 1968 USGS
topographic quadrangle and the excavation designs presented in
the Fox report.
The base of refuse model (Figure 2) must also be considered an
estimate of actual conditions for the following reasons.
1. The 1968 quad sheet is only an approximation of pre-
landfill conditions because filling began in about 1966.
2 . The design drawings were developed using trite coordinates,
rather than one of the more universal crordinate systems
(such as the state plane coordinate system) , and
integration of the quad sheet with the design drawings was
somewhat problematic. Nonetheless, the location of the
cliff in the northeast corner of the site matched
reasonably well (although some editing was required to
produce an exact overlap) .
3 . The base of refuse, as predicted using the USGS quad sheet,
was above the current topography in an area in the
southwest portion of the site. The base of refuse was
NOV-02-01 FRI 10:47 AM FAX NO. P. 03
Mr. Richard Lee
Page 2
ngg0_st _ft, 1999 Doty & Associates
edited in this area such that it was baneath the final
contours.
In spite of the foregoing, both the current topography and base
of refuse models are probably accurate to plus or minus ten feet
in elevation.
The actual volume estimate was prepared by extracting the
vertices from the two drawings. The vertices (data points
consisting of northing, eastinq and elevation) were input to
SURFER, which was used to generated two separate grids and to
compare the two grids (i. e. , to estimate the volume between the
two surfaces) , SURFER predicts a total volume between the base
of refuse and the current topography of 2,680,119 cubic yards
(yds) . Assuming that two feet of final cover were placed over
t.hc: 54 . 09 acres inside the toe, 174 , 541 yds of the total fill
consists of final cover. This means that there are 2, 505, 578
yds of refuse and daily/intermediate cover. Assuming the
standard ratio of refuse to daily/intermediate cover (4 to 1) ,
f estimate the refuse volume on-site to be 2 , 004 ,462 yds.
I trust that the foregoing meets your needs. Please call if you
have questions or need additional information.
Sincerely,
DOTY & ASSOCIATES
njamin P. /Doty, P.E.
NOV-02-01 FRI 10:48 AM FAX NO, P. 05
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