HomeMy WebLinkAboutDrainage Reports - 11/15/2015City of Ft. Colhns�Appn ved Plans
Approved By.
C mcD
Associates civil engineering consultants
November 11, 2005
Wes LamarqueBob Zakely
City of Fort Collins, Stormwater Utility
700 Wood Street
P.O. Box 580
Fort Collins, CO 80522-0580
RE: Final Drainage Letter Report
McKinley Cottages Subdivision
Dear Mr. Lamarque,
The following final drainage letter report addresses existing and proposed drainage
conditions for the above -referenced project. The project is located in the City of Fort
Collins, Colorado at the northeast corner of Laporte Avenue and McKinley Street. The
project is a proposed subdivision of a single large lot (about 24,000 square feet) into four
smaller lots of just more than 6,000 square feet each.
Existing Conditions. The property, 0.55 acres in area, and zoned N-C-L (Neighborhood
Conservation, Low Density District) is located within the Old Town Basin. The property
slopes from its northwest corner toward its southeast corner at an approximate average
gradient of 2.4 percent. Runoff enters the north gutter of Laporte Avenue and flows east
toward the intersection of Laporte Avenue and Shields Street where an inlet is located.
Flow ultimately discharges to the Poudre River at the Howes Street outfall.
Site soils are Fort Collins loam, as presented in the Soil Survey of Larimer County Area,
Colorado, by the Soils Conservation Service.. This soil is of the hydrologic group B..
Minimal, if any, off -site runoff reaches the property. The basin divide is located
approximately 150 feet north of the project, at a high point in McKinley Street. Flow
from this northern -most portion of the basin is directed down the gutters in McKinley to
Laporte Avenue.
The project is not located within either a City of Fort Collins or a FEMA floodplain.
Mountain Avenue, one block to the south, conveys flood waters eastward through Old
Town via Oak Street. Laporte Avenue, beginning at a point about a mile east of the
project, also conveys flood waters through Old Town via Howes Street.
On -site runoff is conveyed toward the property's southeast corner as broad, shallow,
cross -lot flow.
204 walnut street, suite c, fort collins, co 80524 9 office: 970.416.0600 • fax: 970.416.0601
Page 2 of 4
September 28, 2005
Proposed Drainage Plan. The Master Drainage Study for the Old Town Basin was
prepared assuming a percentage of impervious area for each subbasin defined in the
hydrologic model for the basin. The site is located within Subbasin 504, with a modeled
imperviousness of 50 percent (see the attached table photocopied from the Master
Drainage Study). The lot, with house and garage, currently has an imperviousness of
approximately 10 percent. Subdivision of the lot as proposed into four lots, with
sidewalks, houses, garages, and driveways will increase the percentage of imperviousness
on the property. The following table provides an estimate of the impervious areas to be
created by the project, including the property and one-half the adjacent ROW, with build -
out of the proposed lots. Inclusion of one-half the adjacent ROW provides a total project
area for this purpose of 36,550 square feet, or about 0.84 acres.
Table 1. Summary of Expected Im ervious Areas
Description
Estimated Area
(square feet
Estimated Percent
Impervious
Street, street -side sidewalks & alley
11,700
32.0
Existing house footprint
1,315
3.6
Proposed garage for existing house
485
1.3
Proposed houses' footprints
3,400
9.3
Proposed sidewalks and porches
930
2.5
Proposed garages for Lots 1, 2 and 4
1,455
4.0
Driveway aprons (12 x 8 ea.)
190
0.5
Totals
19,475
53.3
In the calculations summarized above, 12" eaves were accounted for in the house and
garage footprints, and calculations for walks included those from the front sidewalk to the
front porch. The four lots will share two driveways; the calculations above were based
on 12' x 8' concrete driveway aprons, with the expectation that the remainder of the
driveways would be pervious surfaces, such as gravel or grass pavers. Backyard
sidewalks were also expected to be pervious surfaces.
The percentage of impervious area affected by the project under the proposed subdivision
and corresponding improvements, will total about 53.3 percent, or about 3.3 percentage
points above the 50 percent modeled for the Old Town Basin. This extra 3.3 percent
(0.027 acres) of impervious surface will increase the weighted runoff coefficient from
0.75 to 0.78, and at an 11-minute duration intensity of 7.42 inches per hour for the 100-
year storm, will increase the project peak runoff from 4.67 cfs to 4.86 cfs, an amount of
0.19 cfs, during the design event (see attached calculations). Therefore, the contribution
of additional runoff from the proposed houses and related lot improvements is negligible.
No additional storm water detention is proposed.
Additionally, the project is situated at a corner with street frontage to three sides. This
places a disproportionate share of the total Old Town Basin ROW adjacent to the project.
Consequently, allowance for this additional impervious burden should be made, and the
extra 3.3 percent of imperviousness in the above calculation is within a certain qualitative
allowance.
QED Associates • 204 walnut street, suite c, fort collins, co 80524 • office: 970.416.0600 • fax: 970.416.0601
Page 3 of 4
September 28, 2005
To ensure that the conditions assumed in the above calculations are constructed on the
site, and to provide additional infiltration, the following note is included on the grading
plan:
"The applicant for a building permit for Lots 1, 2 or 4 shall document that the impervious
footprint of improvements (house, garage, porch, sidewalk and driveway) is not greater
than 2000 square feet. The applicant for a building permit for a garage on Lot 3 shall
document that the impervious footprint of improvements is not greater than 485 square
feet. Gravel, grass pavers, or fragmented stone or masonry in a sand bedding are
considered to be acceptable as pervious surfaces for driveways, sidewalks and patios.
The applicant for a building permit for Lots 1 through 4 shall document that house or
garage runoff from downspouts will be directed to a slotted drain pipe in a trench
backfilled with at least 6 inches of gravel for a length of at least 20 feet."
Drainage from the property will be enhanced using soil excavated from the basements or
crawl spaces of the three proposed home sites to raise elevations in key areas to result in
two percent or greater slopes on the property. Drainage will continue to be directed
primarily southward on the proposed lots with discharge to the Laporte Avenue gutter.
Side -lot swales will be used to direct runoff between homes toward Laporte Avenue.
The northern most of the four proposed lots (Lot 1) will be oriented primarily east -west.
The rear of this lot will drain eastward to a side lot swale that will extend along the entire
eastern perimeter of the eastern -most lot (Lot 4). A sidewalk chase is proposed for
conveyance of this particular swale flow under the walk. Swale and chase capacity
calculations are attached. The front of Lot 1 will drain to McKinley Avenue, from which
the flow will be directed via the east gutter to Laporte Avenue.
The existing gravel alley will be improved to a concrete section, sloped without a crown
to drain to a curb and gutter along the southern edge of the alley. The curb and gutter
will connect with the side lot swale to be constructed along the east edge of Lots 1 and 4.
Proposed Erosion Control Plan. As an infill project, no street construction or overlot
grading is proposed. The developer will provide utility service connections, and
sidewalk, alley, and lot drainage improvements. Construction erosion control will be
provided by the following three measures:
1) A 2" — 3" deep linear sediment trap will be installed on the upstream side around
the entire perimeter of the new sidewalk to limit the transport of sediment off -site,
and
2) A straw wattle will be placed just upstream of the sidewalk adjacent to Laporte
Avenue within the side -lot swale on the east side of Lot 4.
3) Temporary revegetation will be seeded within the new parkway along Laporte
Avenue until the permanent grass is installed.
Construction erosion control details are presented with the Final Plat utility plans
(reduced versions of which are attached to this letter report). Long-term erosion control
will be provided via lot and parkway landscaping. A table summarizing the construction
sequence is attached. Performance standard and effectiveness calculations are also
attached.
QED Associates 9 204 walnut street, suite c, fort collins, co 80524 • office: 970.416.0600 • fax: 970.416.0601
Page 4 of 4
September 28, 2005
Water Quality. Long-term water quality will be provided at the site using Best
Management Practices (BMPs) to filter storm runoff prior to discharging to the street
system. These BMPs include grass swales along each lot line and the use of buried,
slotted PVC pipe to promote infiltration of roof -top runoff. Both of these measures are
appropriate given the scale of the project and the nature and size of these residential lots.
Variances. No variances are requested with this Final Drainage Letter Report.
Should you have any questions or require additional information please do not hesitate to
contact us.
Best regards,
QED Associates wauuwiuinnu,�,
p0 BEG/,g 4
0..O�s. BRU1` 00
m •
°
26325
Kent Bruxvoort, P.E.
QED Associates 9 204 walnut street, suite c, fort coffins, co 80524 • office: 970.416.0600 • fax: 970.416.0601
Old Town Subbasin Parameters
Subbm asTo
ID
Conveyance '.Width
Element _,
Area
(ft) (acres)
Percent
Impervious_
Overland overtana r!ow
Slope Length
. (ftift) (ft)
401
422
2150
14.7
80
0.006
300
402
421
2050
9.3
90
0.010
200
405
405
1100
5.1
90
0.006
200
501
501
1150
9.3
25
0.010
350
502
502
2600
12.0
40
0.020
200
503
503
5050
28.9
50
0.020
250
504
504
4500
36.1
50
0.008
350
505
575
3000
27.4
50
0.006
400
506
576
3100
24.8
50
0.007
350
507
507
4150
35.6
50
0.008
375
508
508
2650
15.1
50
0.020
250
509
463
3750
26.0
50
0.010
300
510
475
4750
38.0
I 60
0.020
350
511
472
3050
21.1
50
0.020
300
512
512
2400
16.6
50
0.020
300
513
464
1650
13.3
50
0.010
350
514
434
1300
7.5
50
0.006
250
515
485
3700
25.3
50
0.008
300
516
516
5650
38.8
50
0.009
300
517
477
2000
16.1
50
0.015
350
518
518
1900
15.4
50
0.015
355
519
519
2300
14.5
30
0.065
275
520
570
2400
12.9
20
0.010
235
521
573
2450
22.0
20
0.010
390
522
522
1550
12.4
50
0.006
350
523
523
6650
45.7
50
0.010
300
524
524
5750
26.4
50
0.016
200
525
454
2200
12.5
50
0.020
250
526
490
2900
16.6
50
0.010
250
527
413
3700
25.4
55
0.010
300
528
419
5100
29.3
55
0.008
250
529
604
3450
37.6
75
0.010
475
531
479
2300
18.5
50
0.010
350
532
424
1750
10.0
50
0.013
250
533
425
1850
10.5
50
0.010
250
534
426
4200
29:0
55
0.013
300
535
430
4800
34.5
90
0.005
315
536
1 811
2350
8.1
90
0.005
150
T:\0PEMCoic14\cofc14 old town prmtrs tbl-rev.wpd B.1 - 1 of 14
ANd ERSON CONSUtTINq ENGINEERS, INC.
CONSTRUCTION SEQUENCE
Project: McKinley Cottages - 1310 Laporte Ave I Date: 9/28/2005
.-7 -------
......................
.....................................,,.................
SarLd Bags
Bare Soil Preparation
Other (List)
Pqrmanent Seed Planting
,
--s
Other
Note: Week Y' is at the project's end when the individual lot owners install project landscaping
and irrigation system, when sod shall be installed in the parkway to be maintained by the
lot owner, and when the swale at the east end of Lot 4 shall be sodded.
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RAINFALL PERFORMANCE STANDARD EVALUATION
MARCH 1991
8-14 DESIGN CRITERIA
EFFECTIVENESS CALCULATIONS
STANDARD FORM B
PROJECT: tAC_YW LIE �(. Co'TT" FS
COMPLETED BY: ICE Ii U- )1C
' DATE: 1 1 2DoS
Erosion Control C-Factor P-Factor Comment
Method t Value Value
S��c•{are.5 ,. b.o( (.moo
MAJOR PS SUB AREA
CALCULATIONS
BASIN (o) BASIIN ci
GKPI. [oo
u ,
ti 99x o•ST ._ Gy
t•
NJ
� x b•3� - [g•o
FIFF= S(3
_a
r7q-
79.5 , QF-b
MARCH 1991
8-15 DESIGN CRITERIA
I
I
PROP ADDITIONAL I -FOOT STRIP OF SIDEWALK
TIE TO ISTING SIDEWALK AND MNTCA CR[ISSSLOPE —.
BEE DETAIL 2581, SHEET 6
DETAIL
YYYIQC
Aw.5p3369
My (NM50])}6
wv feM SI.M
ryra* tar
wV [I•SWO]].31
(
twenddDKiidA�
wV (S)-WXG1
etv .'s.wn.g,
wV C).SW6.67
LELANOf AVENUE
fEHrana; whir-v-I6aT YARES IN rim)_
-
mar rut w marsa ruNI 5
i
EXISTING NON.DIRECTIONAL RAMP SHALL BE REMOVED
AND RECONSTRUCTED PER DETAIL 1607(A), SHEET 6
SIGHT DISTANCE EASEMENT -SEE PLAT
PROP 12- DRIVEWAY FOR LOTS 2 AND 3
REMOVE EXISTING CURB & GUTTER AND SIDEWALK
CONSTRUCT STANDARD TYPE 1 DRIVEWAY APPROACH
SEE DETAHS 706, & 7.I2F, SHEET 6, EXTEND CONC TO PUE
MATCH TO EXIST C&G
CONSTRUCT LINEAR SEDD I iNT TRAP ALONG ENTIRE
EDGE OF NEWWALK
SEEDETAIL3,SHEET7
PROPOSED ADDITIONALI-FOOTSTRIPOFSUDEWALK —
TTE TO EXISTING SIDEWALK AND MATCH CROSSSLOPE
REMOVE EXISTING STONE RETAINING WALL
SEE SIDEWALK WIDENING DETAIL 2501. SHEET 6
SEE DETAIL 3, SHEET 7 FOR LINEAR SEDIMENT TRAP
EXISTING NON -DIRECTIONAL RAMP SHALL BE REMOVED
AND RECONSTRUCTED PER THE TRUNCATED DOME
RAMP DETAIL 1617., SFIEET 6
PROP CROSSWALK- SEE DETAIL II03, SHEET 6 —
EXIST 7D" W "-area.
EXIST?D" W
LiIPORTE AVENVE
Y AMIeQE
BY.5031tc
wv a) 23B9
atv IE)-M.502389
E w
ti
'bep.I t'l awE3 E -Las i I J
-r-o svt a LE
Ik= 13,000 �,tz
LI6T N• 4' 11
---- EXIST OVERHEAD TELEPHONE LINES TO REPLACED IINDERGROlS6
II
P PVPBI
LAN AND PROFILE SEE
'P
'L3D: PATH, II
13J QQr AtltP
9.BU
9Jd
r� ----� 33.1
/^t-T—, ---
— -----� I
T J
YES.-
YES.-
�
Y
k
OT 2 I
•I
• NP91N1
I /•I
at
, a.s
' f ' oKE Buw3Tn
inn" I T7
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Je / �
°nnn. 11is..rnnlnea _
GENERAL DIRECTION OF DRAINAGE
X
/ \
'----- GENERAL ALIGNMENT OF FIITURE ALLES'IMPROVEAffNTS
/ ET#fi w. •.`•.
(By OTHERS)
12A5 \
.M FL
.NFL
\. /� PROP 12' DRIVEWAY FOR LOTS I AND
>t CONSTRUCT STANDAROTYPE I DRIVEWAY APROACH
/
SEE DETAILS 7%.&7.12F, SHEET
EXTEND CONC TO PUE
FROPSWALE CENTERED IN DRAINAGE EASEMENT
WIDTH .5 FEET
DEPR -I FOOT
/
1
SLOPE VARIES
EXIST GARAGE AND CONC PADS TO BE REMOVED
EXIST HOUSE TO REMAIN
PROP S DETACHED SIDEWALK
i r I t SEE DETAILS 702 AND I. SHEET
w EROSION CONTROL STRAW WATTLE
SEE DETAIL 2, SID:ET7
i .1 y,. oil i I II I> TIE PROP DETACHED SIDEWALK
I I y/i-� I •�— �/ �� MATCH TO EXIST ATTACHED SIDEWALK
PROPOSED 2'-WIDE SIDEWALK CHASE, SEE DETAIL 70. SHEET 6
APPROXIMATE LIMITS OF STREET CUT, SEE NOTE S THIS
SHEET
,`
rua10E[
l0.00' too
/ \
(NI502
f�wt aay•/, wV (N)w2511
_ wv (1a).5025 tl
— REMOVE ORIVEW'A) CUT AND CONSTRUCT CURB&GUTTER
MATCH EXISTING CURB is GETTER SECTION AND
TIE TO EXISTING CURB at GUTTER
so
wv. (10.54123 M
REMOVE EXIST ATTACHED SIDEWALK STONE RETAINING WALL
wv (,7 W2347
AND SIDEWALK CONNECTION -SEE DETAIL NO. I, SHEET 6
art,E •5023M
lap? 6dr
NOTES:
1. LINEAR SEDIMENT TRAP TO BE INSTALLED ALONG
ENTIRE UPSTREAM EDGE OF NEW WALK.
2. TEMPORARV REVEGETATION PER GENERAL NOTES
SHALL BE SEEDED WITHIN THE PARKWAY UNTIL THE
LOT OWNER COMPLETES FINAL PARKWAY
LANDSCAPING WITH INSTALLED SOD AND IRRIGATION
SYSTEM.
3. CONTRACTOR SHALL MEET ON -SITE WITH CITY
FORESTER AND CT' ENGINEERING INSPECTOR
REGARDING INSTALLATION OF A SHORT RETAUONG
WALL ADJACENT TO NEW WALK AT TREE IDENTIFIED
ON THESE PLANS.
A. THE APPLICANT FOR A BUILDING PERMIT FOR LOTS 1,
2 OR A SHALL DOCUMENT THAT THE IMPERVIOUS
FOOTPRI NT OF IMPROVEMENTS(HOUSE, GARAGE,
PORCH, SIDEWALK AND DRIVEWAY) IS NOT GREATER
THAN 2M SQUARE FEET. THE APPLICANT FOR A
BUILDING PERMIT FORA GARAGE ON LOT 3 SHALL
DOCUMENT THAT THE IMPERVIOUS FOOTPRINT OF
IMPROVEMENTS IS NOT GREATER THAN 485 SQUARE
FEET. GRAVEL, GRASS PAVERS. OR FRAGMENTED STONE
OR MASONRY IN A SAND BEDDING ARE CONSIDERED TO
BE ACCEPT ABLE AS PERVIOUS SURFACES FOR
DRIVEWAYS, SIDEWALKS. OR PATIOS. THE APPLICANT
FOR A BUILDING PERMIT FOR LOTS I THROUGH A SHALL
DOCUMENT THAT HOUSE OR GARAGE RUNOFF ROM
DOWNSPOUTS WILL BE DIRECTED TO A SLOTTED DRAIN
PIPE IN A TRENCH BACKFFLLED WITH AT LEAST 6
INCHES OF GRAVEL FOR A LENGTH OF AT LEAST IB
FEET.
S. LIMITS OF STREET CUT ARE APPROXIMATE- FINAL
LIMITS TO BE DETERMINED IN THE FIELD By THE
CITY ENGINEERING INSPECTOR ALL REPAIRS TO
BE IN ACCORDANCE WITH CITY STREET REPAIR
STANDARDS.
N
20 a 29 40 FEET
SCAU 1,20 Fen
T6eae pbm have bees reviewed by rite City of Fors Collins for
concept only. The review does not imply respomibilnv by the
viewing tlep.rtmenL the C11v LV Rineer, or the Clty or Fart Calms,
for accurery and corfeaiom Of the c-leulniona. Furthetmore,the
eriew don .. Imply thrr rbe quavdum of Ne items oo We pl.es
an the ..... a s stittes required. T..Oil r s imoll sot be thet�NM
v revon r additional
i eIli
.c a.. of reapo.tlblra' b'the heity of
Fart C6Uws for +ddih9ml quanthiea of ilema ahowo that mar h
required Juno, the c.ntrvnio+ phn-
City of Fort Collins, Colorado
UTILITY PLAN Approval
APPROVER!.
DATE'
Lot .,a —
CHECKED BY:
DATE
seue",ins. w+ter DtiWt
CHECKED BY:-----
_
DATE:
CHECKED BY:
DATE—
..rmeureWm
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CONCRETE ENCASEMENT DETAIL
art Tom a raw, mIFB SEW CONSTRUCTION M1K
uTults MIA" w-.� 'WON-6
ai W. rat
Time pleas here been reviewed by The CITY effort Collins for
eovicePl filh. The review doll vm Until' "Viu ibibp by the
reviewing depa"e.4 the Cxy Engineer, or the City of Fort Cells,
f.rns'<unry nntl w.recdovs of the nl'uhdone. F"ifionare,lbe
review does not i ifi,i thO the qu.ndtiea of Ne items an We plem
•re the e......vtitiea rtq.iof. n The review shell Not be The city o
in Fell
(eveov os ddi.e•nn of fivtle' or rmponb.. by We City or
Fort C,d d. for the ro Yl gvenxxes of items sbD.ry Tbt mey be
required during the coovrumov phew.