HomeMy WebLinkAboutLot Certifications - 12/04/2020 (4)
December 1, 2020
Mr. Wes Lamarque
City of Fort Collins Storm Water Division
700 Wood Street
Fort Collins, CO 80524
(970) 221-6700
Re: Grading Certification for Buildings 15 and 16, Lakeview On The Rise Subdivision, Larimer County
Colorado
Dear Mr. Lamarque,
The purpose of this letter is to provide the grading certification for buildings 15 and 16 within, Lakeview On The
Rise Subdivision, located in Fort Collins, Colorado.
Building Description Address Building Permit No.
Building 15 102 Baggins Drive B1708601
Building 16 103 Baggins Drive B1708600
Aspen Engineering reviewed the record survey, prepared by King Surveyors, Inc., with survey measurements
dated November 16, 2020. Aspen also visited the project site on November 4, 2020 and November 30, 2020 to
visually observe grading adjacent to buildings 15 and 16. Based on the provided record survey and visual
observation, Aspen Engineering asserts that the as-built 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 buildings 15 and 16.
Building 15
1) Grading along the east of the building varies from 9.1% to 16% to the east. Along the south side
of the building slopes vary from 4.7% to 10%. At the west side of the building slopes vary from
14% to 25%. The north side of the building slopes north toward a swale at slopes varying from
3.3% to 4.3%. The swale located between the walk and the north side of the building drain east at
varying slopes from 1.9% to 1.8%.
2) Northwest of building 15, the culvert under the stairs, leading to the public walk along US 287,
was moved east The flowline of the swale was aligned with the new location and adequate grade
in the swale and culvert is maintained to convey flow from north to south with a new culvert
slope of 0.61. The relocated pipe has minimal impact on the drainage.
3) The building elevations step down from west to east. The west units surveyed finish floor (FF)
elevation for the building varies from 5026.88 to 5026.91, compared to the proposed finish floor
elevation of 5026.90. The east units surveyed finish floor (FF) elevation for the building varies
from 5025.85 to 5025.91, compared to the proposed finish floor elevation of 5025.90. The
measured finished floor elevations vary no more than 0.05’ from the design grade elevation.
4) Aspen noted that the downspouts are located on all four sides of the building and appear to be in
satisfactory areas draining to swales, greenspace, directed away from the building or connected to
underground storm drains. Roof drains along the north and west are directed to swales. Roof
drains on the south are piped underground to the adjacent storm drain. Roof drains along the east
drain down slope in the greenspace away from the building. Please refer to the attached redlined
survey exhibit for roof drain locations.
Building 16
1. Grading along the east of the building varies from 21% to 32% draining east to a swale. Along
the south side of the building slopes vary from 3.07% to 9% draining to the south. The west side
of the building slopes vary from 20% to 24% to an adjacent swale. The north side of the building
slopes to the north to enter a swale at slopes varying from 3.1% to 16%. The swales located
between the walk and the north side of the building drain to chases, inlets and adjacent swales,
with slopes varying from 1.8% to 6.5%.
2. The swale along the west side of the building conveys runoff south at approximately 2%. The
swale between building 16 and 17 drains south at approximately 2% to 2.8%.
3. The building elevations step down from west to east. The west units surveyed finish floor (FF)
elevation for the building varies from 5022.68 to 5022.72, compared to the proposed finish floor
elevation of 5022.40. The middle units surveyed finish floor (FF) elevation for the building
varies from 5021.65 to 5021.70 compared to the proposed finish floor elevation of 5021.40. The
east units surveyed finish floor (FF) elevation for the building varies from 5020.66 to 5020.72,
compared to the proposed finish floor elevation of 5020.40. The maximum difference is 0.32 feet
between the design grade and the as-built grade.
4. The finish grade outside the building will be approximately 0.3 feet higher than the design grades
to compensate for the finished floor elevation constructed approximately 0.3 feet higher. The as-
built elevations and calculated slopes away from the building are as noted on the redlined as-built
plan.
5. Aspen noted that the downspouts are located on all four sides of the building and appear to be in
satisfactory areas draining to swales or greenspace directed away from the building. Roof drains
along the north, east, and west are directed to swales. Roof drains on the south drain down slope
in the greenspace away from the building. Please refer to the attached redlined survey exhibit for
roof drain locations.
Based on the recorded survey elevations by King Surveyors, Inc., visual observation, and the above-mentioned
variances/ modifications from the original plans, Aspen Engineering certifies that the grading for buildings 15
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650 E. Garden Drive | Windsor, Colorado 80550
phone: (970) 686-5011 | fax: (970) 686-5821
KING SURVEYORS
www.contact@kingsurveyors.com
GRADE CERTIFICATION