HomeMy WebLinkAboutLot Certifications - 06/23/2017June 9, 2017
Mr. Wes Lamarque
City of Fort Collins Storm Water Division
700 Wood Street
Fort Collins, CO 80524
(970) 221-6700
Re: Grading Certification for Building 5 within Tract A, Crowne on Timberline Subdivision, Larimer
County Colorado
Dear Mr. Lamarque,
The purpose of this letter is to provide the grading certification for Building 5 within Tract A, Crowne on
Timberline Subdivision, located in Fort Collins, Colorado.
Aspen Engineering reviewed the record survey, prepared by King Surveyors, with the record survey dated June
7, 2017. Aspen also visited the project site on June 7, 2017 and June 8, 2017 to visually observe grading adjacent
to Building 5, within Tract A. Based on the provided record survey and visual observation, Aspen Engineering
asserts that the asbuilt grading appears to meet the intent of the approved grading and drainage plans.
Aspen is providing the following as the assessment of the drainage adjacent to Building 5 within Tract A:
1)Grades along the north, south, east, and west sides of the building vary from approximately 0.5%
to 3.8%. Along the north side the building a 2 foot wide concrete pan was constructed to drain
runoff from east to west. Flow passes through a 2 foot metal sidewalk culvert at the building
access sidewalk then flows west to a 2 foot curb cut with metal culvert discharging to the flowline
in Red Willow Drive. Grades within the pan vary from 0.5% to 1.4%. A high point near the
northeast corner splits flow east and west.
2)A 2 foot concrete pan was also constructed along the east side of the building and drains runoff
south to the 2 curb cut with metal sidewalk culvert discharging to the flowline in Willine Way.
The pan slopes vary from 0.4% to 2.2%.
3)A 2 foot concrete pan was also constructed along the south and east side of the building within the
inside corner of the building. Runoff between the sidewalk and building is conveyed to the
drainage pan, flows west then south passing through a 2 foot metal sidewalk culvert at the inside
corner of the building. Flow continues south through a 2 foot curb cut and metal sidewalk culvert
Accepted 6/23/2017 WL
G
G
G
G G
E
E
F
RDRD
RD
RD
RD
RD
RD
RD RD RD RD
RD
RD
RD
RD
RD
RD
RD
RDRDRD
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
RD
=ROOF
DRAIN
NOTE: THIS DRAWING HAS BEEN MODIFIED BY
ASPEN ENGINEERING FOR THE PURPOSES OF A
GRADING CERTIFICATION
LEGEND
G
G
G
G G
E
E
F
4.3% = GRADE PER ENGINEER
FIELD OBSERVATION
2.2%
0.
7
%
1.
2
%
0.
5
%
1.
0
%
0.
5
%
0.
4
%
1.0
%
0.6%
1.0
%
0.
5
%
1.4%
0.7%
0.5%
0.
8
%
0.
6
%
0.6%
0.6%
0.5%0.8%0.6%
0.7%
11.1%
12.5%
12.1%
17.4%
18.9%
4.3% = GRADE PER SURVEYED
ELEVATIONS
NOTE: THIS DRAWING HAS BEEN MODIFIED BY
ASPEN ENGINEERING FOR THE PURPOSES OF A
GRADING CERTIFICATION
LEGEND
0.9%
15
%
5.1%
7.9%
3.8%2.0%
15
%
5.0%
14%
23%
6.
8
%
14%
1.0%
22
%
2.
8
%
1.4%
FLAT 2.
1
%
3.
8
%
3.
0
%
2.
4
%
1.
4
%
2.
5
%
1.
5
%
26%
2.
1
%
2.
0
%
2.
0
%
26
%
10
%
12
%
10
%
5.6%
1.
6
%
1.
8
%
2.
1
%
1.
4
%
2.9%
12
%
14
%
9.
8
%
24
%
26
%
9.4%
12%
19
%
15
%
29%
21%
26%
6.
1
%
PLAN TOF = 53.00
AB FF = 52.80