HomeMy WebLinkAboutSite Certifications - 05/26/201712/15 Page 1
OVERALL SITE and DRAINAGE CERTIFICATION
Commercial, Multi-Family and Subdivision Certification Form and Checklist
Project Name:
Date:
Building Permit Numbers:
(Commercial or multi-family)
Per the requirement in Fort Collins Stormwater Criteria Manual (FCSCM) Volume 1, Section 6.11, please fill in
all applicable items in this Certification Form for Commercial, Multi-Family and Overall Single Family sites.
NOTE: several items must be verified during construction. A copy of the approved grading plan must be
submitted with the as-built grading plan. (As-built elevations must be written in red next to the approved
elevations.)
•Use “Yes” for items completed as described.
•Use “N/A” for items that are not applicable to the site being certified.
•If any blanks are “No,” attach an explanation referencing the item number below.
Attach an explanation or description of the as-built condition for any items listed or for anything not listed but
shown on the approved construction plans.
Provide an as-built redline or Mylar drawing with the following:
I.Water Quality and Quantity Detention Basin Certification - FCSCM Vol.2, Ch.10
For multiple detention basins on a site, provide the following for each basin separately:
A. Volume: As-built topographic verification is attached at 1-foot (or less) contour intervals and
volume verification calculations for the water quality capture volume and the 100-year detention storage
volume.
1. Detention basin topography was prepared by a professional land surveyor registered in the state
of Colorado.
2.Both proposed and as-built contours are shown on the same plan sheet (dashed lines for
proposed and solid lines for as-built).
3.All critical spot elevations as shown on the approved construction plans have been verified and
the as-built elevations are shown on the plan sheet.
4.Stage-storage-discharge tables are provided on a separate document.
5.Verification that designed drain time is in compliance with Colorado Revised Statute § 37-92-
602(8) is attached and has been uploaded to the Statewide Compliance Portal
(tinyurl.com/COCompliancePortal) for approval. Uploaded documents must include:
a.The cover sheet from the approved drainage report
b.The stamped certification page from the approved drainage report
c.As-built topographic survey
d.Stamped certification page from the Overall Site & Drainage Certification
e.PDF output from the Stormwater Detention and Infiltration Design Data Speadsheet
Prairie Village
April 17, 2017
DCP# 15-06
Yes
Yes
Yes
Yes
Yes
Yes
12/15 Page 2
B.Water Quality and Quantity Detention Basin Grading: Attached is as-built verification that there is
a minimum 2% positive fall into the concrete trickle pans or flow-line(s) from all areas in the bottom of
the detention pond. If there is a “soft pan” in the flow-line, all areas still must meet the minimum 2%
grade requirement.
1.Low Flow: Choose one of the following detention basin low flow options as applicable:
a. Turf swale for low flow path in detention basin.
There is a minimum 2% grade in the flow-line(s) of the detention basin. The flattest as-built grade
is .
b.Concrete pan for low flow in detention basin.
There is a concrete pan installed that meets the grades as shown on the approved construction
plans. (Show as-built spot elevations.)
c.Soft pan for low flow in detention basin.
•Verify and document the soft pan material gradation, trench width and depth - to be verified
during construction by engineer. Picture documentation is preferred or engineer’s statement of
visual inspection and compliance. (Choose one below.)
o There is a soft pan with an underdrain installed that meets the design on the approved
construction plans. (Show the underdrain grades, bedding material, geotextile, spot elevations,
bends, cleanouts, etc.)
o There is soft pan installed without an underdrain but there is a type A or B soil. The soil
type must be documented by supplying verification from a registered professional geotechnical
engineer.
NOTE: Spot elevations are to be within 0.2 ft. +/-.
2. Side Slopes: The as-built side slopes of the detention basin have been calculated and are shown.
Indicate the side slope with an arrow and a numerical value (e.g., 6.25:1). The maximum slope allowed
is 4:1. Small areas of 3:1 may be acceptable, but slopes steeper than 3:1 must be stabilized or re-
graded. Provide documentation if a variance was granted for steeper slopes during the design process.
3.Spillway Certification: The following items must be field verified:
a.The location of the spillway is indicated on the as-built plan.
b.The width of the spillway is indicated on the as-built plan.
c.The elevation(s) of the spillway is shown on the as-built plan.
d.A concrete ribbon defines the location and grade of the spillway.
e.There is downstream scour protection in the spillway as per the construction plans. Indicate
type: (riprap size “D50” gradation and bedding type, geotextile, buried
riprap with inches of bury, etc.).
f.There are no obstructions in the spillway, such as trees, bushes, sidewalks, landscape
features, rocks, etc.
FLAT BOTTOM RAIN GARDEN
RAIN GARDEN SIDE SLOPE RANGE FROM 2.4:1 TO 3.3:1. RAIN GARDEN IS 1.5' DEEPAND SIDE SLOPES HAVE BEEN ESTABLISHED WITH SOD.
RAIN GARDEN DOES NOT PROVIDE DETENTION FOR 100-YR STORM. THE 100-YRSTORM WILL BE CAPTURED BY INLET WITHIN RAIN GARDEN AND CONVEYED TODOWNSTREAM DETENTION POND. ANY OVERTOPPING OF RAIN GARDEN WILLOVERTOP AT PARKING LOT CURBLINE AND OVERLAND FLOW ACROSS PARKINGLOT.
N/A
N/A
N/A
N/A
N/A
N/A
No
Yes
Yes
Yes
N/A
N/A
Yes
0%
12/15 Page 3
4.Outlet Structure Certification
a.The orifice plate for the approved release rate is installed with the correct size and location of
the orifice.
b.The orifice plate for the water quality outlet is installed with the correct hole size, number of
rows and columns of holes.
c.The bottom hole on both the water quality and quantity outlets are at the bottom of the plate
so no water ponds in front of the plate.
d.The well screen is the correct material and is installed as shown on the construction plans.
e.100-year overflow grate elevation is . (Elev. A on detail D-46)
f.The top elevation of the water quality capture volume is . (Elev. B on detail
D-46)
g.Overflow grate is made of the correct material, has the correct bar spacing, is hinged at the
top and bolted at the bottom.
h.The bottom of the outlet box has no obstructions or misalignments that will cause it to retain
runoff water and is sloped at 2% towards outlet.
II.Channels/Swales - FCSCM Vol.1, Ch.7, Sect.3&4
A. Capacity: The as-built capacity of all the major channels and swales has been verified. They meet
or exceed capacity requirements shown in the approved drainage study for this project.
1.All swales are located within the drainage easements as shown on the construction plans.
2.Longitudinal slopes and side-slopes (cross-sections) have been verified. Design criteria requires
longitudinal slopes of 2% min. (on vegetated swales) and side-slopes no steeper than 4:1. If these
criteria are not met, the certification engineer will write a justification and propose mitigation for each
instance or have the issues corrected. If variances to these criteria have previously been approved and
are shown on the construction plans, no justification is needed.
3.As-built spot elevations on channels/swales are shown that correspond to spot elevations
shown on the approved construction plans.
4.All permanent erosion control measures are installed as shown on the approved construction
plans (e.g., drop structures, riprap, TRMs, etc.). (Include pictures and verification of the materials used
as part of this verification.)
5.All pans, curbs, storm pipes or other appurtenances appropriately tie into each other in the
system. (Pictures at tie-in points suggested.)
6.The minimum freeboard is provided for all channels and swales as shown on the approved
construction plans or as identified in the approved drainage study. (Show the freeboard provided on
the cross-sections as on the construction plan set or attached as separate documentation.)
7.The low flow portion of all channels or swales is clear of obstructions. (No landscaping, trees,
shrubs, sod, etc. infringe on the low flow portion of channels or swales.)
OVERFLOW GRATE IS BOLTED AT TOP AND BOTTOM. NO HINGE
TOP OF OUTLET STRUCTURE IS 0.11 FT LOWER THAN PLANS BUT STILL PROVIDESUFFICIENT WQ VOLUME
OUTLET STRUCTURE DETAIL DOES NOT SHOW A 2%BOTTOM. BOTTOM IS FLAT,BUT NO PONDING EXPECTED.
LONGITUDINAL SLOPES OF BIOSWALEVARIES BETWEEN 0.9% AND 4%.
Yes
5145.34
5145.34
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
12/15 Page 4
III.Storm Pipes (aka storm drains) - FCSCM Vol.1, Ch.6, Sec. 4
A. Storm Drain Pipe Capacity: The as-built capacity of all pipes installed on this project has been
verified and meets or exceeds the capacity requirements shown in the approved drainage study for this
project.
1.All storm drain pipe sizes and materials have been verified and are in conformance with the
approved construction plans. (Indicate on the plan and profile sheets that they have been verified.)
Material and size substitutions must be approved prior to installation. If a pipe size or material was
changed during construction, the certification engineer must attach the approval documents or supply
them with this certification. Approval documents must include a calculation documenting the capacity
equivalency (equal or greater) of the substituted size.
2.The longitudinal slope of the pipe is as shown on the approved construction plans. The
acceptable minimum slope is 0.4%. All slopes flatter than the designed slope on the construction plans
must be justified with capacity calculations on an attached sheet.
3.The as-built invert elevations have been verified and are shown on the plan and profile sheets of
the approved construction plans.
B.Storm Drain Pipe Installation Requirements: All pipes are installed in accordance with the
approved construction plans.
1.The minimum cover requirements for all pipes have been met as shown on the approved
construction plans. These will be called out in critical locations.
2.All encasements and clearances as specified on the approved construction plans have been met.
3.Any specific joint types or construction methods specified on the approved construction plans
have been met. (List on a separate sheet and attach to this certification.)
IV.Concrete Pans - FCSCM Vol.1, Ch.7, Sec.4.1.3.4
A. Construction/Installation: All concrete pans have been constructed in accordance with the
approved construction plans.
1.The concrete pans are the correct size/width as shown on the approved construction plans.
2.The longitudinal slopes of the pans are as shown on the approved construction plans. The
certification engineer must justify or mitigate longitudinal slopes less than the minimum of 0.4% unless
a flatter slope was approved and is shown on the approved construction plans. Provide mitigation or
justification by separate document.
3.The cross-section of the pan is as shown on the construction plans. (Specifically, the pan cross-
section is “V” shaped and meets the side slope shown on the detail.)
4.The concrete pans are a minimum of 6 inches thick without reinforcement and a minimum of 4
inches thick with a minimum of 6X6-W14xW14 reinforcement per detail D20B and D20C. (Provide
documentation of the reinforcement used if different than shown on the details or on the approved
construction plans.)
5.The spot elevations shown on the concrete pan(s) have been verified and are shown on the as-
built drawings.
PER CONTRACTOR DURING CONSTRUCTION CHECKLIST
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
N/A
N/A
N/A
N/A
N/A
N/A
12/15 Page 5
V. Storm Drain Inlets - FCSCM Vol.1, Ch.6, Sec. 3
A. Construction/Installation: All storm drain inlets have been constructed in accordance with the
approved construction plans.
1.The size and type of inlets are consistent with the inlets shown on the approved construction
plan. Indicate by writing “Verified” on each inlet on the plan sheet or list on a separate document the
inlet number(s), type and size (length). If the inlet installed is other than the one on the approved
construction plan detail sheet, provide the name and source of the detail with justification for equal or
better capacity.
2.The size of the inlet opening is consistent with the approved detail. (Check height and width.)
3.The elevation of the grate (if applicable) is at the elevation shown on the street profile or as
indicated by a spot elevation on the construction plans.
4.The as-built invert elevations of all pipes entering and leaving the inlet are shown on the plan
and profile sheets within construction tolerance of 0.2 feet. If substantially different, provide
justification and capacity calculations to show the capacity is not affected or propose mitigation.
5.The as-built size of the inlet box is as shown on the construction plans or an explanation or
justification is attached.
6.All inlet covers are stenciled or stamped with the following designation: NO DUMPING – DRAINS
TO POUDRE RIVER.
VI.Culverts - FCSCM Vol.2, Ch.9
A. Construction/Installation: All culverts have been constructed and/or installed in accordance with
the approved construction plans.
1.All culvert sizes have been verified as indicated on the as-built construction plans as correct.
2.The culvert material type for all culverts installed is as on the approved construction plans and is
indicated on the as-built plans.
3.The as-built invert “in and out” elevations have been verified and are indicated on the as-built
construction plans.
4.The culvert headwalls or wing walls have been installed as shown on the approved construction
plans. Headwalls or wing walls may be needed in the as-built conditions onsite if the slopes adjacent to
the culvert are greater than 4:1. Please note areas needing stabilization in the certification narrative.
An alternative to consider is a turf reinforcement mat (TRM).
VII.Sub-Drains
A. Construction/Installation: All sub-drains shown on the construction plans have been installed in
accordance with those plans. Sub-drains installed with the sanitary sewer are to be verified on the
sanitary sewer plan and profile sheets of the construction plans. (NOTE: Indicate any sub-drains installed
after the plans were approved on the as-built plans.)
1.The size of the sub-drains are as approved on the construction plans and are indicated on the as-
built plans.
2.The type of sub-drain, in particular the perforated and non-perforated sections of the drain, are
as indicated on the approved construction plans.
INLETS GENERALLY CONFORM TO PLANS. SLIGHT CHANGES IN RIMELEVATION BUT SHOULD FUNCTION AS DESIGNED.
OUTLETSTRUCTUREINVERT IS0.24 FEETLOWER THANPLANS. SHOULDFUNCTION ASDESIGNED
UNDERDRAIN FOR RAIN GARDEN
Yes
Yes
Yes
Yes
No
Yes
N/A
N/A
N/A
N/A
N/A
N/A
Yes
Yes
Yes
12/15 Page 6
3.The cover requirements per the construction plans are provided.
4.The cleanouts have been installed at the locations shown on the construction plans and are
accessible for cleaning. (Cleanouts can be buried a maximum of 6 inches deep with their locations
marked.)
5.The backfill materials for sub-drains are as shown on the approved construction plans. (This
includes the type, depth and width.)
6.The geo-textile liner completely wraps the sub-drain and the permeable backfill material unless
shown otherwise on the approved construction plans. (Sub-drain pipe wrapped in a sock filter material
is accepted only if approved prior to installation.)
VIII.Curb Cuts
A. Construction: All curb cut openings are constructed in accordance with the approved construction
plans.
1.The size (width) of the curb cut opening is as shown on the approved construction plans.
2.The curb cut openings tie into a downstream swale, pipe, or other appurtenances with a smooth
transition and there no obstructions such as riprap or sod impeding the flow downstream of the curb
cut.
IX.Sidewalk Culverts & Chases
A. Construction/Installation: All sidewalk culverts have been installed at the locations shown on the
approved construction plans.
1.The size (width and length) of the culverts are as shown on the approved construction plans.
2.The cover plate is a minimum 5/8-inch galvanized plate bolted to a galvanized angle iron per the
detail shown on the approved construction plans or per the City’s detail.
3.The sidewalk culvert invert “in and out” elevations have been verified and are indicated on the
as-built plans.
4.The sidewalk culvert opening is as shown on the approved construction plans or per the City’s
detail.
5.There is a smooth transition both on the inlet and outlet ends of the sidewalk culvert with no
obstructions such as riprap or sod impeding the flow into or out of the sidewalk culvert.
X. Site Grading
A. Construction: All common open spaces have been graded in accordance with the approved
construction plans.
1.The grading on all common open spaces bordering private lots has been verified as correct and
the as-built rear lot corner elevations have been shown on the as-built plans.
NO GEOTEXTILE FABRIC INSTALLED, NOT A PART OF APPROVED PLANS
LOCATION HAS MOVED SLIGHTLY. STILL SHOULD FUNCTION ASDESIGNED.
SOME OBSTRUCTION FROM BIOSWALE RIPRAP. SHOULD NOT BE ANISSUE DUE TO INFILTRATION WITHIN BIOSWALE. OVERFLOW WILL BEDIRECTED INTO STREET AND COLLECTED IN INLET.
COMMON OPEN SPACES WERE GENERALLY CONSTRUCTED AS DESIGNED WITHMINOR DIFFERENCES IN ELEVATION. SITE SHOULD DRAIN AS INTENDED.
PLEASE SEE LOT GRADING CERTIFICATIONS FOR LOT GRADING. SOMEELEVATIONS DEVIATE BY MORE THAN 0.2 FT TOLERANCE DUE TO SWALEGRADING AND BOULDER RETAINING WALLS. HOWEVER, DRAINAGE PATTERNSAND FLOW AWAY FROM THE FOUNDATION IS MAINTAINED.
CHASES HAVE BEEN UPSIZED.
Yes
Yes
Yes
No
N/A
N/A
N/A
Yes
Yes
Yes
Yes
Yes
No
Yes
No
12/15 Page 7
2.The as-built contours for “overlot grading” are shown on the as-built construction plans for all
common open spaces, tracts, outlots, etc. If not in compliance, please attach a narrative describing the
situation for noncompliance and when it may be corrected. An escrow for overlot grading may be
required. (NOTE: Residential Lot Grading Certification is a separate process from this Overall Site
Certification. It is understood that residential lots will be brought to final grade once the foundation is
backfilled so they may be lower than the plan shows at this Overall Site Certification stage.)
3.All turf reinforcement mats (TRMs) have been installed as shown on the approved construction
plans and the slopes are stabilized.
XI.Riprap - FCSCM Vol.1, Ch.7, Sec.4.4.4.3
A. Construction: All riprap has been installed in the locations and sizes indicated on the approved
construction plans.
XII.Permanent Erosion Control Fabric - FCSCM Vol.1, Ch.7
A. Construction: All fabric has been installed in the locations and sizes indicated on the approved
construction plans.
1.All fabric was installed per the details on the approved construction plans.
XIII.Post-Construction Site Cleanup - FCSCM Vol.3, Ch.7
A. Construction: All construction debris and obstructions of any kind have been removed from
drainage paths.
1.All construction debris has been removed except in staging area(s).
2.All ruts have been smoothed out in all construction areas.
3.All areas needing reseeding have been identified and future stabilization goals have been
coordinated with the Erosion Control Inspector and in accordance with FCSCM Vol.2 Chapter 12. Note
the area needing stabilization in the narrative.
XIV.Certification of Other Permanent BMPs - FCSCM Vol.2, Ch.8, Sec.2 & FCSCM Vol.2, Ch.12
A.The construction of channel drop structures is in accordance with the approved plan both in
location, horizontal dimensions and cross-section.
XV.Certification of LID and Water Quality Facilities - FCSCM Vol.3, Ch.4
A.Attached are the During Construction Inspection Checklist for Low Impact Development (LID) and
other items to be verified during construction, along with pictures and other required documentation.
BIOSWALE COBBLE AND COBBLE DRAINAGE PANS.
SITE IS FULLY LANDSCAPED AND GRASS SEED HAS ESTABLISHED. SITE IS STABILIZED.
N/A
Yes
Yes
N/A
Yes
N/A
N/A
Yes
Yes
Yes
Yes
12/15 Page 8
XVI. Certification and Erosion Control Measures
A. All temporary erosion control measures shall be removed upon stabilization. If at the time of preparing
this certification there are any erosion control measures still remaining on the site, please note them in
the narrative and verify that they need to remain at this time. If in doubt as to the need for any control
measure, please consult with the Erosion Control Inspector at 970-221-6700.
XVII.Statement of Compliance
A. This certification is signed and stamped. By signing this form, the engineer(s) attests that he/she has
visited and observed the site, and to the best of his/her knowledge, the as-built conditions of the drainage
facilities are as described in the above form and in the enclosed as-built plans.
B.Failure to properly disclose all known information could result in the rejection of this certification and
prevent the release of any and all Stormwater Utility permit holds on Building Permits and/or Certificates
of Occupancy within this development.
XVIII.Signature and Stamp by a Colorado-Registered Professional Engineer
Engineer’s contact information:
Name:
Email:
Phone:
Company:
Address:
PE Stamp
Stephanie Thomas
stephanie@northernengineering.com
970-568-5412
Northern Engineering
301 N. Howes Street Suite 100
Fort Collins, CO 80521
OUTLOT A
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FIRE FIRE FIRE FIRE FIRE FIRE FIRE FIRE FIRE
PRAIRIE VILLAGE WQ POND
REQUIRED WQ VOLUME: 295 CU-FT
PROVIDED WQ VOLUME: 427 CU-FT
WQ WSEL: 5145.34
TOTAL VOLUME REQUIRED: N/A
TOTAL VOLUME PROVIDED: 929 CU-FT
SPILL ELEVATION: 5146.25
STAGE STORAGE TABLE
ELEV
AREA
(sq. ft.)
DEPT
H
(ft)
AVG END
INC. VOL.
(cu. ft.)
AVG END
TOTAL VOL.
(cu. ft.)
CONIC
INC. VOL.
(cu. ft.)
CONIC
TOTAL VOL.
(cu. ft.)
5,144.400 311.57 N/A N/A 0.00 N/A 0.00
5,144.500 392.83 0.100 35.22 35.22 35.14 35.14
5,144.600 419.18 0.100 40.60 75.82 40.59 75.73
5,144.700 442.43 0.100 43.08 118.90 43.08 118.81
5,144.800 465.90 0.100 45.42 164.32 45.41 164.22
5,144.900 489.65 0.100 47.78 212.09 47.77 211.99
5,145.000 513.70 0.100 50.17 262.26 50.16 262.16
5,145.100 538.95 0.100 52.63 314.89 52.63 314.78
5,145.200 565.71 0.100 55.23 370.13 55.23 370.01
5,145.300 593.77 0.100 57.97 428.10 57.97 427.98
5,145.400 623.58 0.100 60.87 488.97 60.86 488.84
5,145.450 639.13 0.050 31.57 520.54 31.57 520.41
5,145.500 655.29 0.050 32.36 552.90 32.36 552.77
5,145.600 689.47 0.100 67.24 620.14 67.23 620.00
5,145.700 726.13 0.100 70.78 690.92 70.77 690.77
5,145.800 765.42 0.100 74.58 765.49 74.57 765.34
5,145.900 816.68 0.100 79.10 844.60 79.09 844.43
5,146.000 887.18 0.100 85.19 929.79 85.17 929.60
WATER QUALITY POND - CONSTRUCTED VOLUME
FORT COLLINS, CO
PRAIRIE VILLAGE
E N G I N E E R N GI
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APRIL 18, 2017
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1
3
5
.
1
6
(
N
E
)
PROPOSED
GRADE
EXISTING
GROUND
45
°
B
E
N
D
ST
A
1
1
+
2
6
.
6
6
IN
V
.
I
N
5
1
4
2
.
8
4
(
N
W
)
IN
V
.
O
U
T
5
1
4
2
.
8
4
(
E
)
36.09 LF
12" HDPE
@ 1.75%
STA.=10+82.15
INV.= 5135.25
6" SANITARY SERVICE
STA.=10+84.96
INV.= 5135.09
6" SANITARY SERVICE
STA.=10+73.74
T.O.P.= 5140.32
1" WATER SERVICE
STA.=10+69.54
T.O.P.= 5140.24
1" WATER SERVICE
37.84 LF
6" SLOTTED PVC
@ 0.40%
6'
'
I
N
L
I
N
E
D
R
A
I
N
1
.
2
w/
S
O
L
I
D
G
R
A
T
E
ST
A
1
1
+
7
8
.
1
0
FL
.
E
L
5
1
4
6
.
6
±
IN
V
.
O
U
T
5
1
4
3
.
1
9
(
E
)
18" MIN.
5125
5130
5135
5140
5145
5150
5155
5125
5130
5135
5140
5145
5150
5155
9+5010+0011+00
PROPOSED
GRADE
EXISTING
GROUND
IN
S
E
R
T
A
-
T
E
E
2
ST
A
1
0
+
0
0
.
0
0
IN
V
.
I
N
5
1
3
6
.
5
1
(
W
)
IN
V
.
I
N
5
1
3
6
.
2
6
(
S
)
IN
V
.
O
U
T
5
1
3
6
.
2
6
(
N
)
12
'
'
I
N
L
I
N
E
D
R
A
I
N
2
.
1
w/
D
O
M
E
D
G
R
A
T
E
ST
A
1
0
+
4
0
.
8
9
RI
M
5
1
4
2
.
0
±
IN
V
.
O
U
T
5
1
3
8
.
7
1
(
E
)
40.89 LF
12" HDPE
@ 5.39%
FO FO FO FO FO
FO FO FO FO FO
ELEC ELEC
CONTROL
IRR
HYD
WV
D
D
T
E E E E E E
FO FO FO FO FO
T T T T T T
FO FO FO FO FOTTTTT T T
D
CON
T
R
O
L
IRR
CON
T
R
O
L
IRR
W
W
W
FROMME PRAIRIE WAY
COURT
YARD
COURT
YARDCOURT
YARD
LOT 5 LOT 6 LOT 7 LOT 8
GM
EM
EM
EM
EM
FROMME PRAIRIE WAY
(60' ROW)
HARMONY RIDGE 1ST
INSERTA-TEE 2
STA 10+00.00
N: 107930.19
E: 185664.09
40.89 LF
12" HDPE
@ 6.00%
CONTRACTOR TO USE EXTREME
CAUTION WORKING AROUND EXISTING
TELECOM AND FIBER OPTIC LINE.
LOT 8LOT 7LOT 6LOT 5 12'' INLINE DRAIN 2.1
w DOMED GRATE
STA 10+40.89
N: 107927.65
E: 185623.28
SW
ST ////////////////////////////////////////////////ST
C400
PL
A
N
&
P
R
O
F
I
L
E
ST
O
R
M
D
R
A
I
N
1
&
2
PROPOSED STORM SEWER
LEGEND:
G
TEXISTING TELEPHONE
PROPOSED STORM INLET
EASEMENT LINE
PROPERTY BOUNDARY
NORTH
EEXISTING ELECTRIC
EXISTING STORM SEWER
PROPOSED ASPHALT PATCH
PROFILE SCALE:
STORM DRAIN 1
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NOTES:
1.THE SIZE, TYPE AND LOCATION OF ALL KNOWN UNDERGROUND UTILITIES ARE
APPROXIMATE WHEN SHOWN ON THESE DRAWINGS. IT SHALL BE THE
RESPONSIBILITY OF THE CONTRACTOR TO VERIFY THE EXISTENCE OF ALL
UNDERGROUND UTILITIES IN THE AREA OF THE WORK. BEFORE COMMENCING NEW
CONSTRUCTION, THE CONTRACTOR SHALL BE RESPONSIBLE FOR LOCATING ALL
UNDERGROUND UTILITIES AND SHALL BE RESPONSIBLE FOR ALL UNKNOWN
UNDERGROUND UTILITIES.
2.PIPE LENGTHS ARE CALCULATED FROM THE CENTER OF MANHOLES AND INLET BOX
STRUCTURES. SPECIFIED LENGTH OF PIPE INCLUDES THE LAYING LENGTH OF
FLARED END SECTIONS.
3.ALL RCP SHALL BE CLASS III OR GREATER. ALTERNATES (SUCH AS ADS N-12 OR HP
SANITITE) OUTSIDE OF THE R.O.W. SHALL BE APPROVED IN ADVANCE BY THE
ENGINEER. ALL JOINTS SHALL BE 'WATERTIGHT' USING APPROPRIATE GASKETS OR
JOINT WRAPS (PER ASTM C443/C877 FOR RCP AND PER ASTM F477 / D3212 FOR
PLASTIC PIPE). STORM DRAINS SHOWN ON THIS DRAWING AS POLYVINYL CHLORIDE
(PVC) SHALL BE SDR-35 OR APPROVED EQUAL.
4.CONTRACTOR SHALL BE RESPONSIBLE FOR ANY NECESSARY FIELD LOCATES AND
POTHOLING OF SUBSURFACE UTILITIES. ENGINEER AND CITY SHALL BE NOTIFIED OF
ANY POTENTIAL CONFLICTS.
5.CONTRACTOR SHALL COORDINATE ANY NECESSARY TELEPHONE, CABLE AND
ELECTRIC LOWERINGS (OR RE-ROUTING) WITH THE RESPECTIVE UTILITY PROVIDERS
TO FACILITATE THE INSTALLATION OF THE PROPOSED STORM DRAIN AND UTILITY
SERVICES.
EXISTING GAS
PROFILE SCALE:
STORM DRAIN 2
EXISTING RIGHT OF WAY
PROPOSED RIGHT OF WAY
PROPOSED LOT LINE
EXISTING LOT LINE
PROPOSED RAIN GARDEN
( IN FEET )
1 inch = ft.
Feet03030
30
60 90
1
1
Sheet
Of 15 Sheets
PR
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01.20.15
THE
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F
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REC
O
R
D
D
R
A
W
I
N
G
FROMME PRAIRIE WAY
TURN
AROUND
COURT
YARD
COURT
YARDCOURT
YARD
COURT
YARD
COURT
YARD
COURT
YARD
EM
EM
EM
EM
EM
EM
EM
EM
CONTROL
IRR
D
D
CON
T
R
O
L
IRR
CON
T
R
O
L
IRR
CON
T
R
O
L
IRR
CON
T
R
O
L
IRRCON
T
R
O
L
IRR
X
X
X
X
X
X
X
X
X
X
X
X
X
X
G
G
W
W
W
W
W
SS SS SS SS SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
D
CO
N
T
R
O
L
IR
R
CO
N
T
R
O
L
IRR
3.
4
%
LOT 1
OVERLOOK 5TH FILING PUD
(SENECA CENTER CONDOS)
FROMME PRAIRIE WAY
(60' ROW)
OVERLOOK AT
WOODBRIDGE PUD 1ST
LOT 7
LOT 8
LOT 9
LOT 6
LOT 59LOT 58LOT 57
HARMONY RIDGE 2ND
LOT 56LOT 55
LOT 1
HARMONY RIDGE 1ST
LOT 2
HARMONY RIDGE 1ST
7.7
%
13.2
%
12
.
9
%
2.
1
%
17.8%
5.7
%
1.1
%
1.
0
%
22.6%9.8%
25
.
5
%
7.
9
%
4.7%
2.1%
2.1%
3.1%3.1%
4.1%
19.5%
5.
0
%
6.
0
%
14
.
0
%
1.1
%
2.
1
%
4.3%2.3%
19
.
8
%
5.6%
9.7
%
5.
7
%
4.
9
%
3.
0
%
4.
0
%
5.2%
0.
5
%
13
.
3
%
0.9
%
1.4
%
6.
3
%
3.2%
1.0%2.8%
2.8%
3.6%2.5%2.9%4.0%
4.0%
3.3%
3.8%
3.3%
3.5%
1.1%
1.9%
2.4%
0.6%
2.6%
2.0%
0.5%
0.5%
1.2%
0.5%
2.6%
2.0%
24.2%
STORM DRAIN 1
(SEE SHEET C400)
MATCH EXISTING
(3) - 6" RISERS (5) - 6" RISERS (7) - 6" RISERS(3) - 6" RISERS
PROPOSED
RAIN GARDEN
PROPOSED 1'
COBBLE SWALE
STORM DRAIN 2
(SEE SHEET C400)
PROPOSED 12" HDPE
STORM CULVERT
PROPOSED 1'
SIDEWALK CHASE (TYP.)
(4) - 6" RISERS
ACCESS RAMP
ACCESS RAMP
ACCESS RAMP
EMERGENCY ACCESS EASEMENT
(BY SEPARATE DOCUMENT)
EMERGENCY ACCESS EASEMENT
(BY SEPARATE DOCUMENT)
LOT 6 LOT 7
LOT 8
LOT 5
LOT 4LOT 3LOT 2
LOT 1
OUTLOT A
TRACT A
APPROXIMATE LIMITS
OF INCREASED STEM
WALL HEIGHT
2.0%
ST ST /////////////////////////////////////
(48
.
9
7
)
(45
.
9
9
)
FFE=47.07FFE=47.07FFE=47.07FFE=47.07
FFE=47.83FFE=47.83FFE=47.83
FFE=49.83
49.3
6
44.
4
5
47.3
6
47.3
4
47.3
4
46.8
2
46.8
1
46.8
0
44.5
3
46.4
0
46.40
46.7
3
46.40
47.76
49.7
2
49.29
(49
.
7
2
)
(49
.
7
0
)
(49
.
9
4
)
(50
.
0
4
)
47.35
47.19
(4
6
.
7
4
)
(4
6
.
8
0
)
(4
6
.
4
8
)
(4
6
.
6
9
)
(4
8
.
9
0
)
48.97
48.
0
5
47.54
47.63
45.22
45.16
45.0
4
45
.
0
9
44
.
3
1
44.
1
1
44.00
44.
0
0
42.
2
8
42.24
42.21
42.19
47.85
45.73
45.32
45.49
45.6
045
.
6
2
45.57
45.47
45.52
46.7646.
8
4
46.96
46.62
46.54
47.1
4
45.53
45.29
49.47
49.70
49.37
46.5
6
46.
5
2
46.25
46.24
44.
7
0
45.6
2
45.9
8
43.5
7
47.0
7
44.6
4
47.0
7
45.5
7
47.0
7
46.33
47.8
3
47.8
3
49.8
3
44.8
4
45.47
47.1
5
48.8
2
49.2
2
43.60
42.8
3
42.5
7
47.
6
6
47.
7
5
44.70
46.4
5
46.3
8
46.2
1
46.4
0
46.
4
1
46
.
8
2
47
.
2
6
46.76 46.5
8
46.5
1
45.2
7
45
.
1
9
44
.
7
3
44.6
5
43.4
2
43.
3
4
42.0
0
46.2
1
47.
1
7
46.40
46.4
0
46.
2
5
(4
6
.
3
5
)
45.99
46.14
45.
9
0
49.1
7
50.8
3
50
.
8
3
50.8
3
48.70
47.0
7
47.7
6
47.0
7
47.0
7
46.23
TBC
(4
6
.
4
0
)
(4
6
.
5
7
)
46.
4
1
49.85
49.6
8
(49
.
5
8
)
(4
9
.
4
1
)
(45.60)
(42.54)
(43
.
1
0
)
42.21
42.18
42.48
41.65(41
.
4
2
)
(4
1
.
4
7
)
(49
.
4
1
)
AS-BUILT
12" CHASE DRAIN
DS DS
DS
DS
DS
DS
DSDSDS
DS
DS
DS
DS
AS-BUILT DOWNSPOUT
LOCATION (TYP.)
DS
DS
DS
DS
DS
DS
DS
DS
DSDSDS
DS
DS DS
AS-BUILT FLOWLINE
(TYP.)
(4
6
.
6
9
)
(4
6
.
6
1
)
AS-BUILT BOULDER
RETAINING WALL
AS-BUILT BOULDER
RETAINING WALL
DS
AS-BUILT
BOULDER
RETAINING
WALL
4.
1
%
(3
.
2
:
1
)
(3
.
3
:
1
)
(2.5
:
1
)
(2.
3
:
1
)
(2.9:1)
AS-BUILT EDGE OF
CONCRETE (TYP.)
AS-BUILT FENCE
(TYP.)
100-YR OUTLET (2'X2' INLET)
STRUCTURE/EMERGENCY SPILL
TOP STRUCTURE ELEV=5145.34
INV. IN=5142.80
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
LEGEND:
PROPOSED CONTOUR
EXISTING CONTOUR
PROPOSED BARRIER CURB
PROPERTY BOUNDARY
PROPOSED SPOT ELEVATION
PROPOSED SLOPES
1.THE SIZE, TYPE AND LOCATION OF ALL KNOWN UNDERGROUND UTILITIES ARE
APPROXIMATE WHEN SHOWN ON THESE DRAWINGS. IT SHALL BE THE
RESPONSIBILITY OF THE CONTRACTOR TO VERIFY THE EXISTENCE OF ALL
UNDERGROUND UTILITIES IN THE AREA OF THE WORK. BEFORE COMMENCING
NEW CONSTRUCTION, THE CONTRACTOR SHALL BE RESPONSIBLE FOR LOCATING
ALL UNDERGROUND UTILITIES AND SHALL BE RESPONSIBLE FOR FOR ALL
UNKNOWN UNDERGROUND UTILITIES.
2.REFER TO THE PLAT FOR LOT AREAS, TRACT SIZES, EASEMENTS, LOT DIMENSIONS,
UTILITY EASEMENTS, OTHER EASEMENTS, AND OTHER SURVEY INFORMATION.
3.ALL PROJECT DATA IS ON THE CITY OF FORT COLLINS VERTICAL DATUM; NAVD88.
SEE COVER SHEET FOR BENCHMARK REFERENCES.
4.ALL CURB SPOTS ARE FLOWLINE ELEVATIONS. ALL OTHER SPOTS ARE FINISHED
GRADE ELEVATIONS.
5.THE TOP OF FOUNDATION ELEVATIONS SHOWN ARE THE MINIMUM ELEVATIONS
REQUIRED FOR PROTECTION FROM THE 100-YEAR STORM.
6.CONTRACTOR TO CONFIRM AND COORDINATE GRADING WITH ARCHITECTURAL
AND STRUCTURAL PLANS.
NOTES:
PEDESTRIAN ACCESS RAMPS
EXISTING SPOT ELEVATION
PROPOSED VERTICAL CURB & GUTTER
PROPOSED ELECTRIC TRANSFORMER TF
EXISTING RIGHT OF WAY
NORTH
C500
GR
A
D
I
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G
P
L
A
N
( IN FEET )
1 inch = ft.
Feet02020
20
40 60
Sheet
Of 15 Sheets
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01.20.15
THE
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C602
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CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
PAVEMENT SECTIONS
(PRIVATE AREAS OUTSIDE ROW)
THICKENED CONCRETE EDGE DIMENSIONS FOR SLOTTED PVC PIPE
SCREEN SLOT TABLE GUIDELINES
A B C D E F
PIPE SIZE ROWS OF
SLOTS
SLOT
LENGTH
MAXIMUM
SLOT WIDTH
APPROX.
SLOT/ROW
PER FOOT
APPROX.
SLOT
SPACING
OPEN AREA
PER FOOT
6"3 (MIN.) - 6 (MAX.)1.0625"0.032"12 0.413 1.90 SQ. IN.
300
301 305
308 STANDARD CONCRETE NOTES
1'-9"36"1'
(MIN.)6"
36
"
6"
6"
6"
18
"
18
"
CENTERLINE OF
12" OUTLET PIPE
2" LIP (TYP.)
SECTION D-D
SECTION A-A
#4@18"
#4@12"
2'
-
6
"
#4L@12"
#4@12"
6"
PLAN
6"
3"
CL
R
.
3"
CLR.
3" CLR.
31
"
CLR.
3"
BAR
#4 HOOP
LF
LAP
12"
#4@12" O.C.
O.C.
#4@12"
#4 DIAGONAL
(TYP.)
SECTION C-C
C
C
SECTION LINE A-A (ARROWS
POINT IN DIRECTION SECTION
IS VIEWED)
A A
OPP.OPPOSITE
CLR.CLEARANCE
ABBREVIATIONS
MINIMUM
MAXIMUM
ON CENTER
DIAMETER
TYPICAL
WIDTH OF CONCRETE OPENING
WIDTH OF PLATE
NUMBER
AT@
#
Wp
Wo
TYP.
DIA.
O.C.
MAX.
MIN.
LEGEND
WATER QUALITYWQINVERTINV.
ELEVATIONELEV.
6"
6"
LENGTH OF STRUCTURELs
WIDTH OF STRUCTUREWs
3/8"x6" THREADED BOLT
TO FASTEN GRATE DOWN
TO GRATE, WITH
(TYP. OPP. SIDE)
GRATE (TYP. OPP. SIDE)
2 1/4" FROM EDGE OF
TO HOLD HINGE IN PLACE,
3/8"x6" BOLTS 12" O.C.
1/4" PLATE, WELDED
DD
A
A
RAIN GARDEN OUTLET STRUCTURE309
SLOTTED
SUBDRAIN
FG EL. = 5144.70
EL. = 5145.45
EL. = 5146.00
STEEL CHANNEL FORMED
INTO CONCRETE SIDES 3/8"x1" FLAT BAR
HOLDING FRAME
STAINLESS STEEL
ANCHOR BOLTS
OR EQUAL
B
B
CONTROL
PLATE
STEEL OR EQUAL)
(U.S. FILTER STAINLESS
WELL SCREEN NO. 93
FLOW
1/4" METAL PLATE
GENERAL NOTES
1.CONCRETE SHALL BE CLASS B. MAY BE CAST-IN-PLACE OR PRECAST.
2.REINFORCING BARS SHALL BE EPOXY COATED AND DEFORMED, AND SHALL HAVE A MINIMUM 2"
CLEARANCE.
3.STEPS SHALL BE PROVIDED WHEN VERTICAL DIMENSION EXCEEDS 3'-6" AND SHALL BE IN
ACCORDANCE WITH AASHTO M 199.
4.ALL TRASH RACKS SHALL BE MOUNTED USING STAINLESS STEEL HARDWARE AND PROVIDED
WITH HINGED AND LOCKABLE OR BOLTABLE ACCESS PANELS.
5.TRASH RACKS SHALL BE STAINLESS STEEL, ALUMINUM, OR STEEL. STEEL TRASH RACKS SHALL
BE HOT DIP GALVANIZED AND MAY BE HOT POWDER PAINTED AFTER GALVANIZING.
SECTION B-B
12"
18"
6"
(T
Y
P
.
)
9"
12"
(2) 0.25" WATER
QUALITY HOLES
1/4" (MIN.) THICK
STEEL FLOW CONTROL
PLATE
STAINLESS STEEL
ANCHOR BOLT
BOTTOM ROW OF
HOLES TO BE AT
INVERT OF PLATE
FLOW CONTROL
PLATE
WELL SCREEN NO. 93
(U.S. FILTER STAINLESS
STEEL OR EQUAL)
3/8"x6" BOLTS 12" O.C.
TO HOLD HINGE IN PLACE,
2 1/4" FROM EDGE OF
GRATE (TYP. OPP. SIDE)
12"
HDPE
PIPE
STANDARD CONCRETE NOTES
1.ALL CONCRETE WORK SHALL BE IN ACCORDANCE WITH THE LATEST VERSION OF ACI 318, ACI 304,
AND ACI 315.
ALL CONCRETE SHALL HAVE A MINIMUM COMPRESSIVE STRENGTH OF 4,000 PSI AT 28 DAYS WITH
4%-6% ENTRAINED AIR AND TYPE II CEMENT UNLESS NOTED OTHERWISE.
REINFORCING STEEL SHALL CONFORM TO ASTM A615, GRADE 60, DEFORMED UNLESS NOTED
OTHERWISE. WELDED WIRE FABRIC SHALL CONFORM TO ASTM A185 WELDED STEEL WIRE FABRIC
UNLESS NOTED OTHERWISE. SPLICES SHALL BE CLASS "B". ALL HOOKS SHALL BE STANDARD
UNLESS NOTED OTHERWISE.
THE FOLLOWING MINIMUM CONCRETE COVER SHALL BE PROVIDED FOR REINFORCING STEEL UNLESS
SHOWN OTHERWISE ON DRAWINGS:
CONCRETE CAST AGAINST EARTH = 3"
CONCRETE EXPOSED TO EARTH OR WEATHER:
#6 AND LARGER = 2"
#5 AND SMALLER AND WWF = 1 1/2"
CONCRETE NOT EXPOSED TO WEATHER NOR CAST AGAINST EARTH:
SLAB AND WALL = 3/4"
BEAMS AND COLUMNS = 1 1/2"
A 3/4" CHAMFER SHALL BE PROVIDED AT ALL EXPOSED EDGES OF CONCRETE UNLESS NOTED
OTHERWISE IN ACCORDANCE WITH ACI 301 SECTION 4.2.4.
HOLES TO RECEIVE EXPANSION/WEDGE ANCHORS SHALL BE 1/8" LARGER IN DIAMETER THAT THE
ANCHOR BOLT, DOWEL OR ROD AND SHALL CONFORM TO MANUFACTURER'S RECOMMENDATION FOR
EMBEDDMENT DEPTH OR AS SHOWN ON THE DRAWINGS. LOCATE AND AVOID CUTTING EXISTING
REBAR WHEN DRILLING HOLES IN ELEVATED CONCRETE SLABS.
USE AND INSTALLATION OF CONCRETE EXPANSION/WEDGE ANCHORS SHALL BE PER ICBO AND
MANUFACTURER'S WRITTEN RECOMMENDED PROCEDURES.
2.
3.
5.
6.
7.
4.
304 PRIVATE OUTFLOW VERTICAL CURB & GUTTER
Z-CUT DETAIL
NOTE:
1. TO BE USED AT ALL PAVEMENT EXPANSIONS AND CONTINUATIONS
MILL PAVEMENT MIN 2"
SAW CUT LINE.
CUT TO CLEAN EDGE.
EX DEPTH PLUS 2"
UP TO 8".
THEN EX DEPTH.
MAX 30°
EXISTING PAVEMENT
NEW PAVEMENT
302
303
INLINE DRAIN INSTALLATION
(LANDSCAPED AREAS)
12" - 30" DRAIN
BASIN
12" - 30" INLINE
DRAIN
NON TRAFFIC INSTALLATION
BACKFILL MATERIAL BELOW AND TO
SIDES OF STRUCTURE SHALL BE NATIVE SOIL
AND BE PLACED UNIFORMLY IN 12" LIFTS AND
COMPACTED TO A MIN OF 90%
REV B7001-110-111DWG NO.1 OF 1SHEET1:25SCALEDWG SIZE A
3130 VERONA AVE
BUFORD, GA 30518
PHN (770) 932-2443
FAX (770) 932-2490
www.nyloplast-us.com
12 IN - 30 IN DB & ID NON TRAFFIC INSTALLATION
TITLE
PROJECT NO./NAME
MATERIAL
DATE
APPD BY
9-30-99DATE
CJADRAWN BYTHIS PRINT DISCLOSES SUBJECT MATTER IN WHICH
NYLOPLAST HAS PROPRIETARY RIGHTS. THE RECEIPT
OR POSSESSION OF THIS PRINT DOES NOT CONFER,
TRANSFER, OR LICENSE THE USE OF THE DESIGN OR
TECHNICAL INFORMATION SHOWN HEREIN
REPRODUCTION OF THIS PRINT OR ANY INFORMATION
CONTAINED HEREIN, OR MANUFACTURE OF ANY
ARTICLE HEREFROM, FOR THE DISCLOSURE TO OTHERS
IS FORBIDDEN, EXCEPT BY SPECIFIC WRITTEN
PERMISSION FROM NYLOPLAST.
9-30-99
CJA
NOTE:
1.ALL DRAINS SHALL INCLUDE SUMP INSERT
307
BIORETENTION SOIL LAYERING
(RAIN GARDEN)
310
March 19, 2011
CITY OF FORT COLLINS
BIORETENTION SAND MEDIA SPECIFICATION
PART 1 - GENERAL
A.Bioretention Sand Media (BSM) shall be uniformly mixed, uncompacted, free
of stones, stumps, roots, or other similar objects larger than two inches. No
other materials or substances shall be mixed or dumped within the bioretention
area that may be harmful to plant growth or prove a hindrance to the facility's
function and maintenance.
B.BSM shall be free of plant or seed material of non-native, invasive species, or
weeds.
C.Fully mixed BSM shall be tested prior to installation and meet the following
criteria:
1.P-Index of less than 30
2.pH of 5.5-6.5. Should pH fall outside of the acceptable range, it may be
modified with lime (to raise) or iron sulfate plus sulfur (to lower). The lime
or iron sulfate must be mixed uniformly into the BSM prior to use in the
bioretention facility.
3.Cation Exchange Capacity (CEC) greater than 10
4.Phosphorous (Phosphate, P2O5) not to exceed 69 ppm
5.BSM that fails to meet the minimum requirements shall be replaced at the
Contractor's expense.
D.BSM shall be delivered fully mixed in a drum mixer. Onsite mixing of piles will
not be allowed. Mixing of the BSM to a homogeneous consistency shall be
done to the satisfaction of the Owner.
PART 2 - SOIL MATERIALS
A.Sand
1.BSM shall consist of 60-70% sand by volume meeting ASTM C-33.
B.Shredded Paper
1.BSM shall consist of 5-10% shredded paper by volume.
2.Shredded paper shall be loosely packed, approximate bulk density of
50-100 lbs/CY.
3.Shredded paper shall consist of loose leaf paper, not shredded phone
books, and shall be thoroughly and mechanically mixed to prevent
clumping.
C.Topsoil
1.BSM shall consist of 5-10% topsoil by volume.
2.Topsoil shall be classified as sandy loam, loamy sand, or loam per USDA
textural triangle with less than 5% clay material.
3.Onsite, native material shall not be used as topsoil.
4.Textural analysis shall be performed on topsoil, preferably at its source,
prior to including topsoil in the mix. Topsoil shall be free of subsoil, debris,
weeds, foreign matter, and any other material deleterious to plant health.
5.Topsoil shall have a pH range of 5.5 to 7.5 and moisture content between
25-55%.
6.Contractor shall certify that topsoil meets these specifications.
D.Leaf Compost
1.BSM shall consist of 10-20% leaf compost by volume.
2.Leaf compost shall consist of Class 1 organic leaf compost consisting of
aged leaf mulch resulting from biological degradation and transformation of
plant-derived materials under controlled conditions designed to promote
aerobic decomposition.
3.The material shall be well composted, free of viable weed seeds and
contain material of a generally humus nature capable of sustaining growth
of vegetation, with no materials toxic to plant growth.
4.Compost shall be provided by a local US Composting Council Seal of
Testing Assurance (STA) member. A copy of the provider's most recent
independent STA test report shall be submitted to and approved by the
Owner prior to delivery of BSM to the project site.
5.Compost material shall also meet the following criteria:
a.100 percent of the material shall pass through a 1/2 inch screen
b.PH of the material shall be between 6.0 and 8.4
c.Moisture content shall be between 35 and 50 percent
d.Maturity greater than 80 percent (maturity indicator expressed as
percentage of germination/vigor, 80+/80+)
e.Maturity indicator expressed as Carbon to Nitrogen ration < 12
f.Maturity indicator expressed as AmmoniaN/NitrateN Ratio <4
g.Minimum organic matter shall be 40 percent dry weight basis
h.Soluble salt content shall be no greater than 5500 parts per million or
0-5 mmhos/cm
i.Phosphorus content shall be no greater than 325 parts per million
j.Heavy metals (trace) shall not exceed 0.5 parts per million
k.Chemical contaminants: meet or exceed US EPA Class A standard, 40
CFR 503.13, Tables 1 & 3 levels
l.Pathogens: meet or exceed US EPA Class A standard, 40 CFR
503.32(a) levels
PART 3 - EXECUTION
A.General
1.Refer to project specifications for excavation requirements.
B.Placement Method
1.BSM material shall be spread evenly in horizontal layers.
2.Thickness of loose material in each layer shall not exceed 9-inches.
3.Compaction of BSM material is not required.
BIORETENTION SAND MEDIA SPECIFICATIONS
6"
1"
1 1/2"R.
1'-6"
2" R.
4-1/2"
12
"
6"
1-1/2"
6"
1-1/2" TO
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306 COBBLE SWALE
INV. EL = 5142.86
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