HomeMy WebLinkAboutMIRAMONT FITNESS AND TENNIS CENTER PUD - Filed GC-GENERAL CORRESPONDENCE - 2005-04-25RCSRESOURCE CONSI
A KLH Engineering
November 25, 1992
Mr. Mike Herzig, P.E.
City of Fort Collins
Engineering Department
281 North College Avenue
Fort Collins, Colorado 80521
Re: Miramont PUD Subdrain (RCE Project Number 92-896)
Dear Mr. Herzig:
ENGINEERS, INC.
p Company
Resource Consultants & Engineers, Inc. (RCE) is submitting three copies of this letter on behalf of our client,
the Nordick-Neal Company, in order to provide our comments on a proposed change in subdrain
connection details at the proposed Miramont PUD development. We understand that direct tee connections
between the 8-inch subdrain main and the flinch service lines, originally intended as part the overall design
of the subdrain system per our October 1992 report, are to be eliminated in favor of simply terminating each
service line within the gravel bedding of the subdrain main. Therefore, this letter is submitted as an
addendum to our October report to reflect our comments on this potential design change.
We have confirmed that CDOH #67 gravel bedding, proposed for use at the Miramont project, is capable
of hydraulically transmitting groundwater flows from the service line to the subdrain main without inundation
of the sanitary sewer. Our analysis considered extreme hydrologic conditions (seasonal high recharge)
combined with the conservative assumption that all percolation from each residential service line occurs
within a confined area of the main trench.
The long-term permeability of bedding gravel relies on the exclusion of fine sediments which may tend to
invade the gravel over time. It is to be understood that since RCE has no control in the project during the
actual construction of the subdrain system or perimeter foundation drains, RCE will not accept responsibility
for any future damages caused by inadequate performance of the system where direct connection was not
provided and maintained. Maintenance of individual perimeter drain systems will also be hampered by a
lack of a direct connection. Proper functioning of the system under this design change will depend on both
a clear pipe and clear gravel. With this understanding, the following guidelines are suggested to help
achieve this goal:
Every effort should be taken to preclude the entry of dirt, rocks, and foreign matter into the subdrain
main, subdrain service line, or foundation perimeter drain during all stages of construction.
2. Individual services can be terminated inside the filter fabric wrap which encloses the subdrain main
in order to minimize possible sediment overloading at localized points on the filter fabric, and to
minimize the distance for flow through the bedding gravel;
3665 JFK Parkway, Building 2, Suite 300 • P.O. Box 270460 • Fort Collins, CO 80527
(303) 223-5556 • Denver Metro (303) 572-1806 • FAX (303) 223-5578
Fort Collins, CO • Davis, CA • Laramie, WY
Mr. Mike Herzig
November 25, 1992
3. The penetration of the filter fabric around the subdrain main by the service line should be patched
with a fabric collar and band to prevent the inflow of soil into the bedding gravel at the point of
penetration.
4. All slotted or otherwise perforated service lines and perimeter foundation drains should be installed
with a standard filter fabric sleeve or wrap.
We have met with the developer's engineer, RBD Inc. of Fort Collins, and understand that they will transfer
the information contained in these guidelines to the design plans upon the Citys approval. We also
understand that responsibility for future maintenance of the subdrain system will be borne by the Miramont
PUD Homeowners Association, as recommended in our October 1992 report.
Thank you for allowing us the opportunity to provide you with our comments on this matter. Please feel free
to call with any questions or comments, or if you require additional information.
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Enclosures
cc: Mr. Gary Nordick
Mr. Bud Curtis
Mr. Dennis Donovan
Mr. Lester Litton
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Sincerely,
RESOURCE CONSULTANTS & ENGINEERS, INC.
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Paul E. Clopper, P.E.
Senior er Resource glneer
David M. Frick, Ph.D., P.E.
Vice President
RCE