HomeMy WebLinkAboutWATERFIELD PUD, FIRST FILING - FINAL - 7-95C - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTS (3)Mr. Mike Ludwig
Page 2
June 20, 1997
In addition, a chemical analysis of the irrigation canal water, ground water, and wetland pond water
will be conducted. This analysis will help in determining the source of water for the wetlands. An
analysis of the major ionic species (Ca, Mg, Na, K, Cl, HCO., and SO.) for the three waterbodies
would provide sufficient information to determine water types. A trilinear diagram plot will
graphically display the differing water compositions.
Please do not hesitate to contact me if you have any questions concerning this letter or the future
work planned for the Waterfield P.U.D. Site.
Sincerely,.
Riverside Technology
�eG2r Z
Terry Geiselman
Registered Geologist
cc: Rob Wilkinson, City of Fort Collins
Basil Hamdan, City of Fort Collins
Jim McCory, Colorado Land Source
Bud Curtiss, Northern Engineering
Patrick Plumley, RTi
Richard Spotts, RTi
generul/ludwig2.dnc (Wa?97
A)
Riverside Technology, inc.
Water Resources Engineering and Consulting
June 20, 1997
Mr. Mike Ludwig
Project Planner
Fort Collins Planning Department
281 N. College Ave.
Fort Collins, CO 80526
Dear Mr. Ludwig:
This letter is in response to the Waterfield P.U.D. Fist Filing scheduled for June 18, 1997. It is
Riverside Technology, inc.'s (RTi's) understanding that the Waterfield P.U.D. First Filing will
consist of the apartment complexes and single family dwellings located on the property's east side.
We also understand that the City wishes to avoid any impacts to the wetland area if possible.
There is some concern because a subdrain system will have to be installed to allow for the
construction of basements in the single family dwellings. The current plan is to route the water
collected in the subdrain system to a detention area located to the southwest of the property. If the
diverted water is currently supplementing the wetland hydrology, the reduction in ground water flow
may impact the wetlands.
RTi conducted an initial study of the ground water system at the Waterfield Site during April, 1997.
The results of this study were summarized in a report entitled Preliminary Evaluation of the Ground
Water System at the Waterfield P.U.D. Site dated April, 1997. As part of this report, a
potentiometric surface map vas constructed from existing ground water elevation information. The
map indicates that the bask direction of ground water flow in the area of the First Filing; is to the
south and not towards the wetlands area. If this is the case, diverting the collected ground water
from the subdrain system to the detention area should not impact the wetlands.
RTi is proposing to conduct additional ground water work at the Waterfield site during July and
August, 1997. This work will consist of installing additional peizometers and modeling the ground
water system using a model called "MODFLOW." The model will provide information on how the
ground water system will be effected by the First Filing construction activities as well as future
development that is planned for the site. If the model indicates that ground water flows from the
First Filing area are supplementing the wetlands hydrology, the subdrain system will be redesigned
and the collected ground water will be directed into the wetlands. Mr. Basil Harridan with the City of
Fort Collins Storm Water Division is familiar with the applications of MODFLOW and will be
contacted to review and comment on the results of the modeling program.
grnrral&dwigl.dnc 0620,97
2290 E. Prospect Road, Suite 1 Fort Collins, Colorado 80525 (970) 484-7573 FAX: (970) 484-7593