HomeMy WebLinkAboutGrading Plans - 12/29/2016r n��ir�nc�rs
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December 19, 2016 (Revised December 28, 2016)
Project No: STRATH-16J6C-U9-623
Land mark
L.ovclan�i 9/0-66/ 628G IoII Frc� 8G6-379-67.5'1.
Fax 970-657 G298
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DRAINAGE MEMO
Lots 13 & 14, Block 274, West Side���'�b'Fb'�t'L�d�llii�s�'�`' '°�`''��,<�� c��i���;���� ao�s i i
(a.k.a. 621 Sycamore Street), Fort Collins, CO g1606805
Grading plan & drainage memo
To Whom It May Concern, accepted 12/29/2016 DM
The purpose of the grading plan for the above mentioned address is to protect the proposed
structure and adjoining lots from stormwater runoff. The existing subdivision (West Side Addition to
Fort Collins) was established around approximately 1900 and the grading for the subdivision will
never be able to apply to current drainage and grading standards. The lots are configured as a"Type
A" grading which allnws for drainage from the i-ear of the lot towards the front of the I�t. The existing
lot lines on the west and east are at 1.06°/o and 1.31%, respectively. These are existir�g established lot
lines with an alley running the perimeter of the property. Grades cannot be changed without
impacting other residences adjoining the alley.
The proposed top of foundation of the new structure, was set to I�ave a minimum aF 8" of foundation
reveal and an approximate 10% grade to the farthest lot line (the east lot line of Lot 13). A high point
is proposed at the rear of the house at an approximate elevation of 5,002.40 which will allow for the
installation of rear yard swales graded at 2% or better. The runoff from the rear of the yard should
flow from the rear of the lot to the front and �e diverted around the proposed structure with the high
point and svrales. As an added measure of protection to keep runoff from the proposed structure, the
top of foundation elevation is set approximately 18" (1.54' actual) above the highest lot corner (rear
east corner of lot 13). The current impervious area is 1,080 sq. ft. with proposed c�r�struction of 1,753
sq. ft. for a tatal additional impervious area of 673 sq. ft. w��ich is only a 6% increase.
Tf�is in affect, will not change the historic drainage of the surrounding alley and properties and insure
the site drainage will not impact the proposed structure or adjacent properties. Stormwater runoff
will flow around the proposed structure on either side and will reach the street as historically has
occurred. The top of foundation, adjacent finish grades, and spot grades and elevati�ns shown on the
Plot Plan/Grading Plan and the information in this memo should be used to perform the final grading
for the site. If you have any questions, please feel free to contact our office.
Sincerely,
LANDMARK ENGINEERING, LTD.
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Rodne A. Hari�, P.E.
Director of Engineering
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PLOT PLAN
LOTS 13 & 14, BLOCK 274, WEST SIDE ADDITION TO FORT COLLINS
621 SYCAMORE STREET, FORT COLLINS COLORADO
XXXX.xx = LOT CORNER ELEVATION PER GRADING PLAN
XXX.XX x= EXTERIOR GRADE ELEVATION PER GRADING PLAN
T.O.F. = PROPOSED TOP OF FOUNDATION ELEVATION
SYCAMORE STREET
N 90'00'00" W N 90'00'00" W
LOT 13 & 14 35.00' �s nn'
11,200 SQ. FT.
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NOTEs: Ews 35.00' 35.00'
1. THIS PLOT PLAN IS BASED ON WFORMATION PROVIDED BY THE OWNER/CONTRACTOR. THE
OWNER/CONTRACTOR SHALL VERIFY ALL LOT DIMENSIONS, SEIBACK INFORMA'.ION, EASEMENT
WIDTHS, GRADING ELEVATIONS AND THE PROXIMITY TO EXISTING STRUCTURES WITH THE GOVERNING
AUTHORITY AND OR COVENANTS.
2. DIMENSIONS SHOWN AROUND THE PERIMETER OF THE STRUCTURE ARE TO EXTERIOR
FOUNDATION CORNERS.
3. THE CONTRACTOR SHALL VERIFY ELEVATIONS AND DIMENSIONS PRIOR TO CONSTRUCTION. ANY
VARIATION TO THIS PLAN SHALL BE REPORTED TO LANDMARK ENGINFERING LTD. IMMEDIA?ELY.
4. THE CONTRAClOR SHALL NOT ENCROACH ON ADJACENT PROPERTY WITHOUT PERMISSION FROM
THE AFFECTED PROPERTY OWNERS.
5. PROVIDE AND MAINTAIN POSITIVE DRAINAGE AWAY FROM ALL FOUNDATION WALLS: A MINI�IUM
SLOPE OF 10% !S REQUIRED FOR TIIE FIRST 10 FEET AND THEN A MINIMUM SLOPE OF 27 IS
REQUIRED THEREAFTER.
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� Enginaeri�g
rc 3521 Wesll=isenhower Blva.. Lc.�cla�tl. Colorado tl0537
j(970) 667-6286 • To Free �066) 379-G252 • Faz �970) 667-6290
w w w i a n C m a r k I � 0
REVISED: 19 DEC. 2016
TITLE: LOTS 13 8� 14, BLOCK 274 ,WEST SIDE �cB�
CLIENT: STRATTON HOMES SCALE: 1"=20'
DATE: 28 OCT 2016 � JOB #: STRATH-1 6JbC-09-623