HomeMy WebLinkAboutSite Certifications - 02/24/20227200 South Alton Way, Suite C400
Centennial, CO80112
303-740-9393 Fax 303-921-7320
130 East Kiowa Street, Suite 400
Colorado Springs, CO80903
719-593-2593 Fax 303-921-7320
2900 South College Avenue, Suite 3D
Fort Collins, CO80525
970-491-9888 Fax 303-921-7320
MEMORANDUM
JR Engineering, LLC has completed the attached Overall Site and Drainage Certification, including support
exhibits, for the High Top Cultivation Facility (See attached Exhibit A - Vicinity Map). The following is a
summary of the findings and determinations made while performing the site walk/inspection, review of the
“As-Built Drawing” (attached as Exhibit B), and comparison of LID requirements (see Exhibit C – Impervious
Area/LID Exhibit attached). It is important to note four things while reviewing this memo. First, the
owner/contractor has been approved to delay the installation of re-vegetative seeding and the proposed grass
buffer south of the parking area, until Spring, 2022; as installation is currently prohibited due to winter/frozen
conditions. Second, this project has no new storm system, water quality or detention ponds proposed or
constructed with the site for two reasons: 1. The overall property has been subdivided previously into 3 lots.
Kind Care dispensary is already improved and located on Lot 1. This project, High Tops Cultivation Facility is
now constructed and located on Lot 2. Lot 3 contains the water quality and detention ponds for all three lots,
and was found to be adequate for the improvements on Lot 2, as previously constructed. And 2. The entire
property is very flat, with no subterranean storm outfall (Lot 3 detention/water quality pond drains to the
western flowline of College Avenue. Thus, the far west part of the overall property flows overland to the
southeast (Lot 3) and the natural overland drainage swales have not been altered by this project, since they
are currently draining positively and sufficiently. Third, this project constructed the concrete paved
emergency access turn around alley, which was proposed by the Kind Care project, but never installed. This
added imperviousness was already taken into account in the drainage report for that project. Lastly, this
project’s improvements are mainly resurfaced paved area grading to improve the fall around the structure.
The finished floor elevations are fixed for this facility and thus, natural grades/swales on the north, west and
south open areas have been preserved.
Conclusion:
The High Tops As-Built conditions are in general compliance with the approved Final Drainage Memo “High
Top Cultivation Facility – Weighted Impervious Drainage Analysis” (attached as Exhibit F), Dated January 6th,
2021, Final Drainage Report for High Top Cultivation Facility circa June, 2021 and approved final grading plan.
The project is constructed to provide adequate storm drainage for the 100-year storm event. The following
Stipulations/Clarifications to this memo apply (marked as “No”), based on the City’s completed “Overall Site
and Drainage Certification” that follows:
II. Channels/Swales – FCSCM Ch.8, Sec. 2.0 and Ch9, Sec. 5.0
2. “No” – There were no changes in swale slope to native open space/yard areas south, west and existing
grading north of the structure. As noted in the narrative above, slopes from the west side of Lot 2 are
To:Mr. Wes Lamarque, PE
From: Tim Halopoff, PE, CFM
Date:February 11, 2022
Subject:High Top Cultivation Facility – Overall Site & Drainage Certification
Wes Lamarque
2/24/2022
7200 South Alton Way, Suite C400
Centennial, CO80112
303-740-9393 Fax 303-921-7320
130 East Kiowa Street, Suite 400
Colorado Springs, CO80903
719-593-2593 Fax 303-921-7320
2900 South College Avenue, Suite 3D
Fort Collins, CO80525
970-491-9888 Fax 303-921-7320
existing and fixed, due to the existing structure finished floors, the shallow nature of the detention
pond, and no ultimate subterranean storm system outfall (overall site drains to College Avenue curb
line). The existing swale conditions are less than 2% fall, but operate with adequate drainage for the
existing structure and lot.
XIII. Certification of LID and Water Quality Facilities – FCSCM Ch.7
A.“No” – As stated in Narrative above, the owner/contractor has been approved to delay the
installation of the only proposed LID measure “Grass Buffer” in Spring, 2022. The checklist and
pictures/documentation will be performed at that the future time of installation.
D.“No” – As stated in Narrative above, the owner/contractor has been approved to delay the
installation of the only proposed LID measure “Grass Buffer” in Spring, 2022. The visual verification
of the LID feature will be performed at time of construction.
Respectfully,
Tim Halopoff, PE, CFM
970.817.1010
High Tops BDR
2/11/2022
82009154
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
N/A
No
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
N/A
No
N/A
N/A
No
A Westrian Company
SITE
C-
3
2
5
3
9
C-3 2539
N/A
N/A
N/A
On behalf of
DocuSign Envelope ID: 5DACE0F8-5E80-49CC-B0F6-C1FC2BCDBC93
1/28/2021
1/28/2021
1/29/2021
Th
i
s
u
n
o
f
f
i
c
i
a
l
c
o
p
y
w
a
s
d
o
w
n
l
o
a
d
e
d
o
n
J
a
n
-
1
0
-
2
0
2
0
f
r
o
m
t
h
e
C
i
t
y
o
f
F
o
r
t
C
o
l
l
i
n
s
P
u
b
l
i
c
R
e
c
o
r
d
s
W
e
b
s
i
t
e
:
h
t
t
p
:
/
/
c
i
t
y
d
o
c
s
.
f
c
g
o
v
.
c
o
m
Exhibit C - Original Site Drainage Plan
Th
i
s
u
n
o
f
f
i
c
i
a
l
c
o
p
y
w
a
s
d
o
w
n
l
o
a
d
e
d
o
n
J
a
n
-
1
0
-
2
0
2
0
f
r
o
m
t
h
e
C
i
t
y
o
f
F
o
r
t
C
o
l
l
i
n
s
P
u
b
l
i
c
R
e
c
o
r
d
s
W
e
b
s
i
t
e
:
h
t
t
p
:
/
/
c
i
t
y
d
o
c
s
.
f
c
g
o
v
.
c
o
m
Fo
r
a
d
d
i
t
i
o
n
a
l
i
n
f
o
r
m
a
t
i
o
n
o
r
a
n
o
f
f
i
c
i
a
l
c
o
p
y
,
p
l
e
a
s
e
c
o
n
t
a
c
t
C
i
t
y
o
f
F
o
r
t
C
o
l
l
i
n
s
U
t
i
l
i
t
i
e
s
7
0
0
W
o
o
d
S
t
r
e
e
t
F
o
r
t
C
o
l
l
i
n
s
,
C
O
8
0
5
2
4
U
S
A
HIGH TOP CULTIVATION FACILITY
BASIC DEVELOPMENT REVIEW
VICINITY MAP
NTS
LOT 2 OF DINGS SUBDIVISION, 6629 S. COLLEGE AVE.,
FORT COLLINS, COLORADO 80525
LEGEND
A
W
e
s
t
r
i
a
n
C
o
m
p
a
n
y
HI
G
H
T
O
P
C
U
L
T
I
V
A
T
I
O
N
F
A
C
I
L
I
T
Y
BA
S
I
C
D
E
V
E
L
O
P
M
E
N
T
R
E
V
I
E
W
IM
P
E
R
V
I
O
U
S
A
R
E
A
E
X
H
I
B
I
T
SITE
X:
\
3
9
7
0
0
0
0
.
a
l
l
\
3
9
7
8
3
0
0
\
D
r
a
w
i
n
g
s
\
P
r
e
s
e
n
t
a
t
i
o
n
s
\
3
9
7
8
3
0
0
I
m
p
e
r
v
i
o
u
s
E
x
h
i
b
i
t
.
d
w
g
,
B
D
R
S
i
t
e
P
l
a
n
,
6
/
1
2
/
2
0
2
0
9
:
3
2
:
1
5
A
M
,
F
C
Exhibit D - Proposed Impervious/Water Quality Areas
7200 South Alton Way, Suite C400
Centennial, CO80112
303-740-9393 Fax 303-921-7320
130 East Kiowa Street, Suite 400
Colorado Springs, CO80903
719-593-2593 Fax 303-921-7320
2900 South College Avenue, Suite 3D
Fort Collins, CO80525
970-491-9888 Fax 303-921-7320
MEMORANDUM
JR Engineering, LLC has completed a weighted imperviousness based storm drainage evaluation for
the High Top Cultivation Facility. The following is a summary of the findings and determinations
made while performing an analysis of the proposed emergency access paving addition, concrete
mechanical pad, and sidewalk. It is important to note three things while reviewing this memo. First,
we believe that this project will not be required to provide a full drainage report, water quality or
detention facilities, based on the proposed site condition having a net reduction in impervious area
from the sites existing condition. Second, this analysis has been performed using a “weighted
impervious area” calculation, which is the square footage of each impervious surface type, multiplied
by the surfaces weighted impervious coefficient values for infiltration characteristics of different
materials (< 1). The impervious coefficient values were derived from the City of Fort Collins
Stormwater Criteria Manual Table 4.1-3 “Surface type – Percent Impervious”. Lastly, the High Top
Cultivation Facility site area’s drainage pattern was originally included in the “Stormwater & Erosion
Control Report for Kindcare” prepared by Forbes Engineering and approved by the City of Fort
Collins September 26, 2016. The “Proposed Impervious Area Exhibit” and “Proposed Drainage Sub-
Basins” maps from the original report can be referenced in Appendix C.
The High Top Cultivation Facility project site is located along the west side of South College Avenue
and south of West Trilby Road as seen on the vicinity map in Appendix A. The property currently
supports an existing metal building, which covers an approximate footprint of 18,270 sf. Just south of
the building lies an existing asphalt parking area and a vacant earth/gravel area to the west. The site is
composed primarily of type C soils and generally, slopes from 0 to 2 percent towards the lot’s eastern
property line. A specific breakdown of weighted impervious areas that compares existing areas to
proposed improvement areas can be found on the “Impervious Area Exhibit” within Appendix C. All
flows generated in the existing condition can be found in the “Stormwater & Erosion Control Report
for Kindcare” as previously mentioned.
The proposed improvements will include the addition of 5,578 sf of concrete/asphalt area and the
removal of 842 sf of existing asphalt for landscape planters. The proposed improvements are
composed of the addition of 2,390 sf of asphalt surface for emergency access, replacing a portion of
existing parking with landscape planters and sidewalk, the addition of 869 sf concrete mechanical pad,
2,319sf of sidewalk, and removal of the on-site gravel area to be replaced with seed and landscaping.
To:Mr. Wes Lamarque, PE
From:Tim Halopoff, PE, CFM
Date:Jan 6, 2021
Subject:High Top Cultivation Facility – Weighted Impervious Drainage Analysis
Exhibit F - Imperviousness Memo