HomeMy WebLinkAboutPOUDRE R1 JUNIOR HIGH SCIENCE LAB ADDITIONS SITE PLAN ADVISORY REVIEW - 7 93 - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTS (4)An engineering analysis of the existing storm drainage system in
Stover Street showing that sufficient capacity exists to accept
the additional runoff must be submitted to support your request
for a variance from detention requirements. If the additional
undetained runoff can enter the system without adverse impacts, a
variance can be granted.
Please let me know if you have any questions.
Sincerely,
Kate Malers
Civil Engineer I
cc: William O. Brenner
T.ed-_Sh`epard
Utility Sei .es
Stormwater
February 3, 1993
Mr. Ron Daggett
Project Manager
PR-1 School District
2407 LaPorte Ave.
Fort Collins, Colorado 80521
Dear Mr. Dagget,
This letter is in response to the January 27, 1993 letter from
William Brenner of Robb, Brenner and Brelig, Inc. to Ted Shepard
of the City Planning Department. That letter gave additional
detail on the storm drainage impacts of the planned Science Room
addition at Blevins, Boltz, and Lesher Junior High Schools.
Blevins Jr. High: I understand that the additional will be built
in an area that is presently paved. Therefore there will be no
increase in imperviousness and no impact on storm runoff from the
site. No additional analysis is necessary.
Boltz Jr. High: The January 27 letter indicated that the
addition at Boltz Jr. High will increase the impervious area at
the site by 1,620 square feet. The letter also references a
drywell capable of capturing drainage from roof areas, although I
am not clear about whether this drywell is existing or is
proposed in conjunction with the addition. It is requested that
no detention requirements be imposed at the Boltz site.
Regardless of the capacity of any existing or proposed drywell,
the location of Boltz Junior High School immediately upstream of
the Lemay Detention Pond makes it likely that a variance to
detention requirements can be granted at this site. An
engineering analysis should show that the peak runoff from the
school site will not coincide with the peak inflow to the Lemay
Detention Pond (runoff from the school site will be routed
through the pond before runoff from upstream portions of the
basin reaches the pond). Please submit documentation showing
that there will be no adverse downstream impacts to support your
request for a variance.
Lesher Jr. High: It is my understanding that the entire 3,183
square foot addition at Lesher Junior High School will convert
existing grassed area into impervious area. The January 27
letter indicates that runoff from the addition will tie into the
existing storm drainage system in Stover Street, as the runoff
from the existing roof area does.
235 Mathews Street • P.O. Box 580 • Fort Collins, CO 80522-0580 • (303) 221-6589 • FAX (303) 221-6239