HomeMy WebLinkAboutRIDGEWOOD HILL AMENDMENT TRACT B - MA210028 - SUBMITTAL DOCUMENTS - ROUND 4 - SUPPORTING DOCUMENTATION (9)AV
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BUILDING D
BUILDING E
BUILDING F
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LOWER RAIN
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TOT-LOT
BUILDING A
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SCALE:1" = 30'
15'30'60'90'
LEGEND:
RAIN GARDEN MEDIA
GENERAL NOTES:
1. THESE LID (LOW IMPACT DEVELOPMENT) PLANS SHALL BE READ IN
CONJUNCTION WITH THE LANDSCAPE, DRAINAGE AND GRADING PLANS FOR A
COMPLETE SET OF PLANS.
NOTES:
1. WATER QUALITY CAPTURE VOLUME IS CALCULATED IN ACCORDANCE WITH THE REQUIREMENTS OF THE CITY OF FORT COLLINS
STORMWATER CRITERIA MANUAL.
2. REQUIRED LID TREATMENT VOLUME CALCULATED TO BE THE RUNOFF FROM 75% OF THE IMPERVIOUS AREAS IN THE DRAINAGE
SUB-BASIN SERVED BY THE LID FACILITY, IN ACCORDANCE WITH SECTION 3.1(a) OF VOLUME 3, CHAPTER 2, SECTION K OF THE FORT
COLLINS AMENDMENTS, PER ORDINANCE NO. 007,2016.
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2" MIN8" MIN
18" MIN
30
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12" MAX
4" MIN DIAMETER
PERFORATED PVC
UNDERDRAIN
GEOTEXTILE FABRIC OR
LINER (AS PER PLAN)
FLAT AREA - SEE DESIGN
PLANS FOR EXTENTS OF
BIORETENTION FLAT
SURFACES
NATIVE SOIL ZONE
8" MIN DEPTH OF
RESERVOIR
AGGREGATE
4" MIN DEPTH OF
DIAPHRAGM
AGGREGATE
18" MIN DEPTH OF
BIORETENTION SAND
MEDIA
RUNDOWN OR SCOUR
PROTECTION NEEDED
ON STEEP SLOPES
MAXIMUM ALLOWABLE
PONDING DEPTH IS 12" FROM
THE TOP OF THE MULCH
LANDSCAPING TO BE
INSTALLED PER APPROVE
LANDSCAPING PLAN
FLAT
4 MAX
1
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NOTES:
1.CONTRACTOR SHALL INSTALL BIORETENTION BASINS ACCORDING TO THE APPROVED PLANS AND/OR
CONSTRUCTION SPECIFICATIONS.
2.PRE-CONSTRUCTION
2.1.CONTRACTOR SHALL AVOID COMPACTION OF THE BIORETENTION BASIN AREA TO PRESERVE EXISTING INFILTRATION RATES.
2.2.CONTRACTOR SHALL CALL FOR CITY INSPECTIONS AT THE INTERVALS STIPULATED IN THE "DURING CONSTRUCTION INSPECTION CHECKLISTS".
3.DURING CONSTRUCTION:
3.1.CONTRACTOR SHALL PROVIDE CONSTRUCTION OBSERVATION DURING CONSTRUCTION OF THE BIORETENTION BASIN TO ENSURE COMPLIANCE WITH THE APPROVED PLANS AND DESIGN
SPECIFICATIONS.
3.2.LOOSE MATERIALS SHALL NOT BE STORED ON THE BIORETENTION AREA.
3.3.THE CONTRACTOR SHALL, AT ALL TIMES DURING AND AFTER SYSTEM INSTALLATION, PREVENT SEDIMENT, DEBRIS AND DIRT FROM ANY SOURCE FROM ENTERING THE BIORETENTION SYSTEM.
4.GEOTEXTILE LINERS:
4.1.WHERE USED, GEOTEXTILE LINERS (PERMEABLE OR IMPERMEABLE AS PER PLAN) SHALL BE INSTALLED ALONG PERIMETER OF CROSS-SECTION OF THE BIORETENTION CELL.
4.2.WHERE USED, GEOTEXTILE LINERS SHALL BE PLACED IN ACCORDANCE WITH MANUFACTURER'S STANDARDS AND RECOMMENDATIONS. ALL SEAMS AND OPENINGS IN THE LINER SHALL BE SEALED
ACCORDING TO MANUFACTURER'S RECOMMENDATIONS AND SPECIFICATIONS.
4.3.WHERE USED, IMPERMEABLE GEOMEMBRANE SHEET / LINER SHALL BE 40 MIL THICK, HIGH-DENSITY POLYETHYLENE DESIGNED SPECIFICALLY FOR FLEXIBLE GEOMEMBRANE APPLICATIONS. ADJACENT
STRIPS OF IMPERMEABLE LINER SHALL OVERLAP A MINIMUM OF 18", OR PER MANUFACTURER'S SPECIFICATION.
4.4.WHERE USED, CONTRACTOR TO PLACE LINER IN A WAY THAT ENSURES ENOUGH SLACK IN THE LINER TO ALLOW FOR BACKFILL AND SETTLING WITHOUT TEARING THE LINER.
5.AGGREGATES AND BSM:
5.1.ALL AGGREGATES SHALL BE ANGULAR, CRUSHED, WASHED ROCK, CLEAN OF DEBRIS AND WITH NO MORE THAN 1% FINES.
5.2.RESERVOIR AGGREGATE SHALL BE GRADATION ASTM #57 OR #67.
5.3.DIAPHRAGM AGGREGATE SHALL BE "PEA GRAVEL", WITH GRADATION ASTM #8, #89 OR #9.
5.4.THE BIORETENTION SOIL SHALL MEET THE CITY BIORETENTION SAND MEDIA ("BSM") SPECIFICATION FOUND
AT:https://www.fcgov.com/utilities/business/builders-and-developers/development-forms-guidelines-regulations/
6. UNDERDRAIN:
6.1.UNDERDRAIN PIPE TO BE PERFORATED OR SLOTTED. PERFORATIONS OR SLOTS TO BE SMALLER THAN SURROUNDING AGGREGATE TO ENSURE AGGREGATE DOES NOT FALL INTO OR CLOG THE
OPENINGS.
6.2.DO NOT WRAP UNDERDRAIN WITH GEOTEXTILE OR SOCK.
6.3.UNDERDRAIN PIPE MUST OUTFALL BY GRAVITY AND MUST TIE INTO A STORMWATER PIPE, INLET OR SYSTEM AND THE LOCATION MUST BE APPROVED BY THE CITY. THE UNDERDRAIN TIE-IN SHALL
MEET ALL REQUIRED PIPE SIZE, TYPES, AND COVER REQUIREMENTS THAT MAY APPLY TO PIPING THAT EXTENDS BEYOND THE LIMITS OF THE BIORETENTION CELL AND ENCROACHES INTO PUBLIC
RIGHT-OF-WAY OR OTHER PROPERTY.
7.OVERFLOW INLET:
7.1.A 100-YEAR OVERFLOW SPILLWAY OR INLET MUST BE PROVIDED.
7.2.ALL OVERFLOW INLETS SHALL BE CAPPED WITH A DOME-SHAPED GRATE, OR PER PLAN.
7.3. IN ALL CASES, AN EMERGENCY OVERFLOW ROUTE SHALL BE PROVIDED AND THE LOCATION SHALL BE IDENTIFIED ON THE PLANS (THIS MAY BE COINCIDENT WITH THE 100 YEAR OVERFLOW SPILLWAY).
8.CLEANOUTS:
8.1.PROVIDE CLEANOUTS (AS PER PLAN) TO ALLOW INSPECTION (BY CAMERA) OF THE UNDERDRAIN SYSTEM DURING AND AFTER CONSTRUCTION.
8.2.CLEANOUTS SHALL BE PROVIDED AT EACH BEND GREATER THAN OR EQUAL TO 90° AND EVERY 100' ALONG A STRAIGHT RUN. CLEANOUT SHALL BE INSTALLED PER THE APPROVED PLANS.
8.3.CLEANOUTS SHALL BE A SOLID WALL PVC STRUCTURE FOR ALL VERTICAL SECTIONS WITH FITTINGS TO CONNECT TO DISTRIBUTION AND UNDERDRAIN PIPING MATERIALS, AS REQUIRED.
9.FOREBAY:
9.1.THE FOREBAY SHALL BE EASILY ACCESSIBLE WITH A HARD SURFACED BOTTOM FOR MAINTENANCE PURPOSES.
10.LANDSCAPE MATERIALS
10.1.CONTRACTOR SHALL NOT PLACE WEED BARRIER ANYWHERE WITHIN THE BIORETENTION BASIN. IF MULCH IS PLACED IN THE BIORETENTION BASIN, IT MUST BE NON-FLOATABLE.
10.2.IF MULCH OR COBBLES ARE PLACED IN THE BIORETENTION BASIN, THE MAXIMUM ALLOWABLE WATER DEPTH OF 12" AND REQUIRED BASIN VOLUME MUST BE MEASURED FROM THE TOP SURFACE OF
THE MULCH OR COBBLE.
10.3.ROLLED TURF OR SOD IS NOT AN ALLOWABLE LANDSCAPE MATERIAL FOR BIORETENTION BASINS. LOW WATER CONSUMPTION LANDSCAPE PLANTINGS ARE PREFERRED FOR BIORETENTION BASINS.
10.4.LANDSCAPE PLANTINGS SHALL NOT BE PLACED TO IMPEDE DRAINAGE INTO OR OUT OF THE BIORETENTION BASIN.
10.5.TEMPORARY IRRIGATION MAY BE INSTALLED TO ESTABLISH LANDSCAPING OR SEED IN THE BIORETENTION BASIN.
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% sand by volume meeting ASTM C-33.
B.Shredded Cedar Mulch
1.BSM shall consist of 5% shredded cedar mulch by volume.
2.Shredded mulch shall be loosely packed, approximate bulk density of 50-100 lbs/CY.
C.Topsoil
1.BSM shall consist of 30% 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 5% 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 0-5mmhos/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.