Stormwater Facilities Maintenance Specifications RFP

RFP #200002846

Attachment F

Stormwater Facilities

Maintenance Specifications

RFP 200002846 Attachment F

COUNTY OF FAIRFAX, VIRGINIA

Stormwater Facilities Maintenance Specifications

TABLE OF CONTENTS

SECTION TITLE PAGE

02020 Erosion and Sediment Control 02020-1

02100 Site Maintenance 02100-1

02610 Testing 02600-1

02700 Paving and Surfacing 02700-1

02930 Topsoil, Seed & Sod 02930-1

02950 Plants 02950-1

02970 Traffic Control 02970-1


SECTION 02020 - EROSION & SEDIMENT CONTROL

02020-1

A. Straw Mulch

Furnish and install weed-free straw mulch at a rate of two (2) tons per acre.

B. Jute Mat (EM-400, EM-700, EM-900, Or Equal)

Furnish and install Jute Mat (or equal) using biodegradable stakes per Virginia Std. 3.36.

C. Natural Fiber Coir Logs 6” Inches to 8” Inches in Diameter

Furnish and install natural fiber coir logs 6" inches to 8" inches in diameter.

D. Natural Fiber Coir Logs 12” Inches to 16” Inches in Diameter

Furnish and install natural fiber coir logs 12" to 16" inches in diameter.

E. Straw Blower (30 to 40 HP)

Furnish and install weed-free straw at a rate of two (2) tons per acre. Hourly rental for equipment rental

time applies for straw blower use time only.

F. Hydroseeder (400 to 600 Gallon) with Upland Seed Mix

Furnish and install upland seed mix at a rate of 22 lbs/acre with cover crop (annual rye) at 65 lbs/acre.

G. Hydroseeder (400 to 600 Gallon) with Wetland Seed Mix

Furnish and install wetland seed mix at a rate of 22 lbs/acre with cover crop (annual rye) at 65 lbs/acre.

H. Hydroseeder (400 to 600 Gallon) with County Supplied Seed Mix

Pick up, deliver and install seed with county supplied seed mix.

I. Silt Fence with Wooden Stakes

Furnish, install and remove VA Std. 3.05 silt fence with wooden stakes.

J. Super Silt Fence with Steel Posts & Chain Link Fence

Furnish, install and remove erosion and sediment controls per the Fairfax County Public Facilities

Manual Plate 5-11.

K. Safety Fence

Furnish, install and remove VA Std. 3.01 safety fence.

L. Tree Protection Fencing

Furnish, install and remove VA Std. 3.38 tree protection fence.

M. Silt Fence Inlet Protection

Furnish, install and remove VA Std. 3.07 silt fence inlet protection.


SECTION 02020 - EROSION & SEDIMENT CONTROL

02020-2

N. Block and Gravel Inlet Protection

Furnish, install and remove VA Std. 3.07 block and gravel inlet protection.

O. Filter Bag

Furnish, install and remove filter bag. The bag is made of non-woven geotextile, "Geotex Mirafi 14ON"

(or equal), with a minimum surface area of 225 square feet per side. The dewatering bag has a nozzle

large enough to accommodate a four (4”) inch diameter pump discharge hose. This line item includes

appropriately sized pump and three (3”) inch clean stone or mulch underneath. Includes off-site disposal

of the filter bag and contents.

P. Non-Woven Filter Fabric

Furnish and install filter fabric "Geotex Mirafi 14ON" (or equal).

Q. Temporary Stone Construction Entrance

Furnish and install temporary construction entrance per Virginia Std. 3.02. Price includes cost for

providing wash rack and water.

R. Mobilization (Applicable to Disturbance > 2,500 SF in a single location)

All activities and associated costs for transportation of contractor's personnel, equipment, and operating

supplies to the site; establishment of offices, buildings, and other necessary general facilities for the

contractor's operations at the site; premiums paid for performance and payment bonds including

coinsurance and reinsurance agreements as applicable. Mobilization will not be considered as work in

fulfilling the contract requirements for commencement of work.

Demobilization includes all activities and costs for transportation of personnel, equipment, and supplies

not required or included in the contract from the site; including the disassembly, removal, and site

cleanup of offices, buildings, and other facilities assembled on the site specifically for this contract.

Price is a lump sum based on 5% of the contract amount.

S. Mobilization (Applicable to Disturbance < 2,500 SF in a single location)

One-time fee per job assignment for as-needed maintenance disturbing < 2,500 SF in a single location.

All mobilization and demobilization activities and associated costs for transportation of contractor's

personnel, equipment, and operating supplies to and from the site.

END OF SECTION 02020


SECTION 02100 - SITE MAINTENANCE

02100-1

A. Mowing/Clearing

a. Task Area #1 Ponds: Currently includes mowing access road or entryway; mowing entire dam

(front plus 10 feet from toe/top/back plus 10 feet from toe) taking care that slopes can exceed

3:1 on some dam sites; mowing 10 feet around control structure; mowing emergency spillway;

mowing 10 feet around outfall structure; mowing 10 feet on each side of the outfall channel.

Ideally the finished height of grass is between 6 inches to 8 inches. Clearing includes removing

all woody stock, brush and trees up to 2 inch diameter. All materials are removed and properly

disposed of off-site.

b. Task Area #2 Green Infrastructure: Currently includes mowing/clearing of and around the

facility out to three feet or to the curb, whichever is reached first. If part of the facility is

landscaped or planted with perennials, then mowing/clearing does not include the area that is

landscaped. Ideally, the finished height of the mow strip is between 2 inches to 4 inches.

Currently once per year for vegetated swales (LOS1, standard) clearing includes removing all

woody stock, brush and trees up to 2 inch diameter and undesirable woody plants not included

on the landscape plan. For facilities with bioretention-grade filter media, only light duty

equipment is used for mowing/clearing.

B. Mowing (Steep Slopes) /Trimming/Repair

Mowing extents will be provided by the County for each facility and will generally include: mow of the

road or entryway; mow entire dam (front plus 25 feet from toe/top/back) taking care that slopes can

exceed 3:1 on some dam sites; mow 25 feet around control structure; mow emergency spillway; mow

25 feet around outfall structure; mow ten (10) feet on each side of the outfall channel. Finished height

of grass is typically between 5.5-6 inches in height. Grass is not cut less than five (5) inches in height.

Mowing is done in a horizontal pattern. Mowing pattern up and down the slope is not allowed. Remove

all woody stock, brush and trees up to two (2) inches diameter.

Mowing will be performed on steep slopes and a Kut Kwick, Ventrac or equal must be capable of

traversing horizontally without slipping or impacting the earth (i.e., rutting, scalping).

Trim areas not accessible by mowing equipment, including but not limited to perimeters of sites,

shoreline, riprap areas. Use a string trimmer to trim vegetation to six (6") inches in height.

Remove and properly dispose of all material off-site. Also includes minor turf repair (e.g., minor bare

spot repair and seeding), as needed. Includes all mobilization, equipment, labor, material and disposal

costs.

C. N/A

D. Pond Control Structure/Riser Clearing

Remove trash, debris, floatables and other material from directly around and on top of the control

structure/riser. Confined Space Entry Permit will not be required. Remove and properly dispose of all

material off-site.

E. Pond Low-Flow Channel Clearing (25’ Radius)

Clear sediment, trash, debris, floatables and other material from the pond channel(s) and trash rack

within twenty-five (25’) foot radius of pond control structure/riser. Remove and properly dispose of all

material off-site. Assume three (3) CY for non-regional and four (4) CY for regional ponds.



02100-2

F. Shoreline Clean-Up

Remove trash/debris from within fifteen (15’) feet of the wet side of the water surface elevation and

fifteen (15’) feet of the dry side of the water surface elevation (thirty (30') feet total). This may require

the use of a boat. Remove and properly dispose of all material off-site.

G. Trash/Debris Removal & Disposal

Remove trash/debris from various stormwater facilities including in all ponding areas, flow paths from

inflow to the control structure, and pre-treatment cells. Remove and properly dispose of all material off-

site.

H. Pond Low-Flow Channel Clearing (Per 25’)

Clear sediment, trash, debris, floatables and other material using handheld equipment from the pond

low-flow channel. Assume three (3) CY for non-regional and four (4) CY for regional ponds. Remove

and properly dispose of all material off-site.

I. Tree Removal (2” to 6” DBH)

Remove and cut flush live or dead tree two (2") inches to six (6") inches DBH. Remove and properly

dispose of all material off-site.

J. Tree Removal (7” to 12” DBH)

Remove and cut flush live or dead tree seven (7") inches to twelve (12") inches DBH. Remove and

properly dispose of all material off-site.

K. Tree Removal (13” to 24” DBH)

Remove and cut flush live or dead tree thirteen (13") inches to twenty four (24") inches DBH. Remove


L. Tree Removal (25” to 36” DBH)

Remove and cut flush live or dead tree twenty five (25") inches to thirty six (36") inches DBH. Remove


M. Tree Relocation (2” to 6” DBH)

Relocate tree as shown on the project drawings or instructed by County Project Manager. Includes all

operations in connection with the removal and relocation of the tree and other necessary items to dress

up and restore the disturbed area to include root pruning, soil amendments, watering, staking and deer

guards as needed.

N. Shrub Relocation (1 Gallon to 3 Gallon Container)

Relocate shrub as shown on the project drawings or instructed by County Project Manager. Includes

all operations in connection with the removal and relocation of the tree and other necessary items to

dress up and restore the disturbed area to include root pruning, soil amendments, watering, staking

and deer guards as needed.



02100-3

O. Stump Removal and Grinding (Up to 12”)

Remove stumps up to twelve (12") inch diameter. The stump is ground to a minimum depth of three

(3') feet below the ground surface, with the exception of stumps in the area of a dam embankment. The

cavity is backfilled to be level with the adjacent ground with well compacted material. The disturbed

area is seeded and mulched. In the area of a dam embankment all imbedded stumps and roots are

completely removed. The cavity is backfilled with materials suitable for dam embankment construction.

The embankment material is overlaid with six (6") of topsoil, seeded and mulched. The final grade

matches the adjacent grades. Remove and properly dispose of all material off-site.

P. String/Line Trimming

String/Line trimming of perimeters of sites, shoreline, riprap areas, and other areas not accessible by

mowing equipment.

Q. Bushhogging (Or Equal)

Clearing of heavy vegetation. Remove and properly dispose of all material off-site.

R. Clearing and Grubbing

Remove low growth vegetation, including shrubs and small trees up to five (5”) inches in diameter, and

other waste materials or refuse on site that is not covered under other bid items. Grub to a depth of 12

inches below the ground surface. Remove and properly dispose of all material off-site.

S. Dethatching

Remove and dispose of vegetative debris after brush hogging or mowing as in the case of a meadow

or overgrown field. This work may be accomplished with tow-behind equipment or hand tools. Waste

material may include some woody plant stems such as brambles and seedlings under one (1") inch

diameter. Remove and properly dispose of all material off-site.

T. Excavation of Sediment

Removal of sediment from the bottom of existing pond (assuming mechanical removal). The volume of

dredged material will be calculated from the design plans, bathymetric surveys and /or field measured

as determined by the County/contractor. Temporary stockpiling of spoil material on site for the purpose

of drying and loading on truck is considered incidental to this line item. Remove and properly dispose

of all material off-site. Transport of sediment on public road for off-site disposal using a sealed or lined

tandem truck is considered incidental to this item. Waste collected as a result of excavation or dredging

is considered a potentially hazardous special waste and must be disposed of in accordance with

9VAC20-81, Fairfax County Code Sections 109.1-6 and 109.1-7, and any other applicable local, state

and federal guidelines.

U. Animal Burrow Repair

Repair animal burrow and erosion due to animal activity on top and side slopes of dam embankments

or elsewhere. Animal burrows within dam embankments and earthen berms are repaired by "mud-

packing" using a slurry mixture consisting of 90% soil (mostly sand), 10% cement and water. Disturbed

areas are backfilled with six (6") inches topsoil and stabilized with seed and mulch.

V. Blockage Removal/Dewatering Services-Without Pump

Drain and remove blockage without using a pump. This may require the use of a boat.



02100-4

W. Blockage Removal/Dewatering Services-With Pump

Drain and remove blockage using a four (4") inch pump. Hourly rental for equipment rental time applies

for pump use time only. This may require the use of a boat.

X. Weeding

a. Remove all weeds. Weeds are considered plants that are not included in the approved

landscape plan. Weeding occurs in all areas of the facility including, curb cuts, pre-treatments,

and inflows. Remove and properly dispose of all waste material off-site.

b. Selective Weeding: Remove only Invasive Plants considered High Priority (Attachment E).

Weeding on facilities with bioretention-grade filter media (i.e., bioretention, vegetated swale,

and treebox filters) is done with hand tools. Remove and properly dispose of all waste material

off-site.

Y. Perennial Cutback

Cutback and dethatch all herbaceous vegetation in the facility to a height of 6 inches to 8 inches.

Currently, work is achieved using hand tools or in facilities with bioretention-grade filter media using

only manual labor and hand-held light duty equipment, unless otherwise specified or approved.

Remove and properly dispose of all waste material off-site.

Z. Pruning

Prune approved trees, shrubs, and other woody plants in accordance with the latest edition of the ANSI-

A300 pruning standards. Where specified in routine maintenance, this is done once annually in late

winter/early spring (i.e., March). Remove and properly dispose of all waste material off-site.

AA. Sediment Removal & Disposal by Hand

Remove accumulated sediment in infiltration beds, roof drain areas, pre-treatments, inflows, infiltration

beds, void spaces in stone armoring (e.g., at riprap, check dams, plunge pools), and both entrance and

outlet curb cuts of a facility. Remove and properly dispose of all waste material off-site.

BB. Underdrain Flush

Clear and dispose of all accumulated debris and sediment in underdrain systems. Work typically

involves a snake and/or use of a high-pressure water jet or sewer jet with spray nozzle but may involve

a combination vacuum and jet. The water jet equipment is generally mounted on a vehicle equipped

with a high-pressure pump and a 200 to 300 gallon water supply. A 3-inch flexible hose line typically

200 feet in length with a metal nozzle directs jets of water to loosen debris in pipes. This system is not

be used to clean erodible areas such as trench walls. Remove and properly dispose of all waste

material off-site.



SECTION 02610 - TESTING

02610-1

A. BTEX

Benzene, Toluene, Ethylbenzene and Xylene (total) (BTEX). SW-846 Analysis Method 8260B or

8021C. Reported in mg/kg.

B. TCLP Heavy Metals (RCRA-8)

Toxicity characteristic leaching procedure (TCLP) of heavy metals (RCRA-8). SW-846 Analysis Method

6010D of Arsenic, Barium, Cadmium, Chromium, Lead, Selenium, and Silver. SW-846 Analysis Method

7470 or 7471B of Mercury. Reported in mg/L.

C. PCBs

Polychlorinated Biphenyls (PCBs). SW-846 Analysis Method 8082A of Aroclor 1016, Aroclor 1221,

Aroclor 1232, Aroclor 1242, Aroclor 1248, Aroclor 1254, Aroclor 1260. Reported in mg/kg.

D. TOX

Total Organic Halides (TOX). SW-846 Analysis Method 9020B of organic halides containing Chlorine,

Bromine, and Iodine. Reported in mg/kg.

E. TPH

Total Petroleum Hydrocarbons (TPH). SW-846 Analysis Method 8015C of Diesel Range Organics

(DRO) and Gasoline Range Organics (GRO). Reported in mg/kg.

F. Total Nitrogen

Total Nitrogen. EPA Method 300.0/SM4500 "calculation" of Nitrite+Nitrate+TKN. Reported in mg/kg.

G. Total Phosphorus

Total Phosphorus. EPA Method 365.1 REV2. Reported in mg/kg.

H. VDOT Test Method 134

VDOT Test Method 134-Bioretention Soil Media Test. VDOT Materials Division's Manual of

Instructions.

I. Nutrients

Conduct soil analysis of pH, salts, nutrients, percent solids, and organic matter. Nutrients analyzed

includes, but not necessarily be limited to, nitrogen, phosphorous, potassium, magnesium, calcium,

zinc, manganese, copper, iron, and boron. A report is provided that includes the analytical results as

well as recommendations for any soil augmentation or amendments is provided when pH, salts,

nutrients, percent solids, and organic matter are requested. A report is provided that includes the

analytical results as well as fertilizer and lime recommendations when pH and nutrients are requested.

J. Physical

Sieve analysis to determine USDA textural soil classification, soil organic matter content analysis using

USDA/NRCS approved methodology, and all associated laboratory analysis fees (per sample).



SECTION 02700 - PAVING AND SURFACING

02700-1

A. VDOT No. 1 Coarse Aggregate Stone (Surge Stone) with Fabric Liner

Furnish and install VDOT No. 1 coarse aggregate stone (surge stone). A lining of geotextile fabric,

"Geotex Mirafi 14ON" (or equal), is placed between the stone and the underlying soil surface to prevent

soil movement into or through the riprap. Remove and properly dispose of all waste material off-site.

B. VDOT No. 57 Stone with Fabric Liner

Furnish and install VDOT No. 57 stone. A lining of geotextile fabric, "Geotex Mirafi 14ON" (or equal), is

placed between the stone and the underlying soil surface to prevent soil movement into or through the

riprap.

C. VDOT Class I Rip-Rap with Fabric Liner

Furnish and install VDOT Class I riprap. A lining of geotextile fabric, "Geotex Mirafi 14ON" (or equal),

is placed between the stone and the underlying soil surface to prevent soil movement into or through

the riprap.

D. VDOT Class II Rip-Rap with Fabric Liner

Furnish and install VDOT Class II riprap. A lining of geotextile fabric, "Geotex Mirafi 14ON" (or equal),

is placed between the stone and the underlying soil surface to prevent soil movement into or through

the riprap.

E. Three-Inch (3”) to Six-Inch (6”) River Rock (Washed) with Fabric Liner

Furnish and install washed three (3") inch to six (6") inch river rock (Delaware Valley or equal). At least

50% of a one (1) ton load includes stones greater than four (4") inches in diameter. A lining of geotextile

fabric, "Geotex Mirafi 14ON" (or equal), is placed between the stone and the underlying soil surface to

prevent soil movement into or through the riprap.

F. Five-Inch (5”) to Eight-Inch (8”) River Rock (Washed) with Fabric Liner

Furnish and install washed five (5") inch to eight (8") inch river rock (Delaware Valley or equal). At least

50% of a one (1) ton load includes stones greater than six (6") inches in diameter. A lining of geotextile

fabric, "Geotex Mirafi 14ON" (or equal), is placed between the stone and the underlying soil surface to

prevent soil movement into or through the riprap.

G. 21-A Aggregate (with Fabric Liner)

Furnish and install specified stone. A lining of geotextile fabric, "Geotex Mirafi 14ON" (or equal), is

placed between the stone and the underlying soil surface to prevent soil movement into or through the

riprap.

H. Concrete Removal and Disposal

Remove concrete and properly dispose of all materials off-site.

I. Grouting Cracks and Joints

Furnish and install grout per VDOT 2016 Road and Bridge Specifications. All surfaces are prepared

and products are applied in accordance with manufacturers' specifications.


SECTION 02700 - PAVING AND SURFACING

02700-2

J. Epoxy Injection of Cracks

Furnish and install epoxy injection per VDOT 2016 Road and Bridge Specifications. All surfaces are

prepared and products are applied in accordance with manufacturers' specifications.

K. Polyurethane Liquid Chemical Grout

Furnish and install polyurethane liquid chemical grout per VDOT 2016 Road and Bridge Specifications.

All surfaces are prepared and products are applied in accordance with manufacturers' specifications.

L. Parging (per 50lb Bag)

Furnish and install parging per VDOT 2016 Road and Bridge Specifications. All surfaces are prepared

and products are applied in accordance with manufacturers' specifications. Parge gaps in existing

concrete structures with a non-shrink grout meeting MSHA 902.11 © specifications.

M. Finishing, Seals and Sealants

Furnish and install finishing products, seals and sealants to the surface of concrete structures. All

surfaces are prepared and products are applied in accordance with manufacturers' specifications.

N. Finishing and Painting

Furnish and install finishing and painting per VDOT 2016 Road and Bridge Specifications. All surfaces

are prepared and products are applied in accordance with manufacturers' specifications.

O. Ready Mix Concrete (Bulk)

Furnish and install ready mix concrete, Perma-crete or equal (bulk).

P. Ready Mix Concrete (90 LB Bag)

Furnish and install ready mix concrete, Perma-crete or equal (90 LB bag).

Q. Mortar (Bagged)

Furnish and install mortar (bagged).

R. Sewer Brick

Furnish and install sewer brick.

S. Asphalt Patch

Furnish and install asphalt hot mix patch at up to four (4”) inches. All surfaces are prepared and products

are applied in accordance with manufacturers' specifications.

T. Pea Gravel

Furnish and install pea gravel. Remove and properly dispose of all waste material off-site.



SECTION 02930 - TOPSOIL, SEED & SOD

02930-1

A. Seed Mix - 75% Kentucky 31 (K-31) and 25% Annual Rye Grass

Furnish and install grass seed mixture of 75% K-31 and 25% annual rye grass. Install at a rate of K-

31 seed (60lbs/acre application rate) and annual rye (15-30 lbs/acre application rate). Cover with

weed-free straw mulch layer and water.

B. Seeding – Fescue Overseeding

Furnish and install Tall fescue (150 lbs/ac) grass seed mixture.

C. Seeding – Kentucky 31 (K-31)

Furnish and install K-31 grass seed mixture. Install K-31 seed at a minimum rate of 150 lbs/acre.

Cover with weed-free straw mulch layer and water.

D. Wetland Seed Mix - Ernst Seed #120 (Or Equal)

Furnish and install wetland seed mix product No. 120 By Ernst Seed or equal. Install at a rate of 22

lbs/acre with cover crop (annual rye or equal) at 65 lbs/acre. Cover with weed-free straw mulch layer

and water.

E. Wetland Seed Mix – Ernst Seed #131 (Or Equal)

Furnish and install wetland seed mix product No. 131 By Ernst Seed or equal. Install at a rate of 22

lbs/acre with cover crop (annual rye or equal) at 65 lbs/acre. Cover with weed-free straw mulch layer

and water.

F. Bioretention (Rain Garden) Seed Mix – Ernst Seed #180 (or Equal)

Furnish and install bioretention (rain garden) seed mix product No. 180 By Ernst Seed or equal. Install

at a rate of 22 lbs/acre with cover crop (annual rye or equal) at 65 lbs/acre. Hand broadcast using

coarse sand as a bulking agent at a 4:1 (sand:seed). Cover with weed-free straw mulch layer and

water.

G. Seed Mix Supplied by the County

Pick-up, deliver and install non-cover crop seed mix supplied by the county. Evenly mix the non-cover

crop seed at a rate of 0.5 pounds/1,000 square feet (approximately 22 pounds/acre) with a seasonally

appropriate cover crop at 1.5 pounds/1,000 square feet (approximately 65 pounds/acre) and coarse

sand as a bulking agent at a 4:1 (sand:seed) by volume, unless otherwise directed by the

manufacturer. Broadcast evenly across the project area. Cover with weed-free straw mulch layer and

water.

H. Cover Crop of Annual Winter Rye (Secale cereale)

Furnish and install cover crop of annual winter rye (Secale cereale) according to manufacturer's

suggested rates, at least to 65 pounds/acre. Cover with weed-free straw mulch layer and water.

I. Cover Crop of Annual Rye [Warm Season] (Lolium multiflorum)

Furnish and install cover crop of annual warm season rye (Lolium multiflorum) according to

manufacturer's suggested rates, at least to 65 pounds/acre. Cover with weed-free straw mulch layer

and water.



02930-2

J. Cover Crop of German Millet (Setaria italica)

Furnish and install cover crop of German Millet (Setaria italica) according to manufacturer's suggested

rates. Prepare soil, incorporate into prepared area (by raking), broadcast seed, apply sufficient weed-

free straw mulch, and water.

K. Cover Crop of Common Oats (Avena sativa)

Furnish and install cover crop of common oats (Avena sativa) according to manufacturer's suggested

rates, at least to 65 pounds/acre. Common oats are typically used in the winter. Cover with weed-free

straw mulch layer and water.

L. Drill Seeding

Drill the seeds into the prepared seedbed. The maximum depth for drilling grass seeds is ½ inch.

Unless shown otherwise in the Contract Documents, the maximum depth for drilling wildflower seeds

is ⅛ inch. Drill seed mix at 0.5 lbs/1,000 square feet with cover crop at 1.5 lbs/1,000 square feet.

M. Watering

Water landscaped areas as directed and approved by the County. The County may request additional

watering at any time. Watering may occur under the following conditions:

1. Plants that are in their first growing season after installation (June-September) receive the

equivalent of one (1") inch of water, if there has been seven (7) days or more without rain,

2. Established plants and sod beyond their first growing season receive the equivalent of one

(1") inch of water if temperatures have exceeded 95 degrees Fahrenheit for seven (7) days

or more,

3. Established plants beyond their first growing season receive the equivalent of one (1") inch of

water between June and September if there has been three (3) weeks or more with no rain.

N. Bioretention-Grade Filter Media

Furnish and install bioretention-grade filter media. This filter media conforms to the Virginia DEQ

Stormwater Design Specification No.9, which includes design, construction, and material

specifications. At a minimum, the media is composed of 85-88% sand, 8-12% soil fines and 3-5%

organic matter, and a materials ticket confirming that composition by volume is submitted to the

County.

Vegetation Management: The filter media is able to meet tests to confirm all material specifications.

Upon request the County may require the contractor to use VDOT Virginia Test Method 134, which

includes testing methods for particle size distribution (AASTO T88), organic content, Cation Exchange

Capacity, Bulk Density, pH, and extractable phosphorous. After the particle size distribution has been

completed, the textural analysis is determined using the USDA Soil Triangle. For this purpose, sand

is a soil particle with a diameter greater than or equal to 0.05 mm and less than 2 mm; silt is a soil

particle with a diameter of less than or equal to 0.05 mm and greater than 0.002 mm, and clay is a

soil particle with a diameter of less than 0.002 mm.

O. Topsoil

Furnish and install topsoil to a three (3") inch depth. Topsoil is a loam, sandy loam, clay loam, silt

loam, sandy clay loam, or loamy sand. Soils having low moisture content, low nutrient levels, low pH,

materials toxicity to plants and/or unacceptable soil gradation are not acceptable. Topsoil is not a



02930-3

mixture of contrasting textured subsoils, and contains less than 5% by volume of cinders, stones,

slag, coarse fragments, gravel, vegetative matter, trash, or other materials larger than 1 1/2" (inches)

in diameter. It is free of plants or plant parts of Bermuda grass, Quack grass, Johnson grass,

Nutsedge, Poison Ivy, Phragmites, Canada thistle, or any noxious weeds and contain no substances

harmful to plant growth. The ideal topsoil has a pH between 5.5-6.5. Organic matter is greater than

5%. Maximum sand content in topsoil is 50%.

P. Topsoil – Install from Offsite Fairfax County Stockpile

Pickup, deliver, and install topsoil supplied by the County to a three (3") inch depth.

Q. Imported Clean Fill Material

Furnish and install clean fill material that is free of weeds, debris and contaminants. Documentation

that fill material is free of weeds, debris and contaminants is provided to the County Project Manager.

R. Double Shredded Hardwood Mulch Supplied By County

Pickup, deliver, and install double shredded hardwood mulch supplied by the County. Pickup locations

may be throughout Fairfax County. Augment the mulch cover with double-shredded hardwood mulch

up to a 3-inch depth throughout the ponding area and any other areas without cover (i.e., bare earth)

in the facility boundary. Remove and properly dispose of all waste material off-site.

S. Double Shredded Hardwood Mulch Provided By Contractor

Furnish and install double shredded hardwood mulch. Augment the mulch cover with double-

shredded hardwood mulch up to a 3-inch depth throughout the ponding area and any other areas

without cover (i.e., bare earth) in the facility boundary. Remove and properly dispose of all waste

material off-site.

T. Topdressing (Screened Soil)

Furnish and install screened soil.

U. Topdressing (Screened Soil + Compost)

Furnish and install 70% screened soil and composted organic material.

V. Topdressing (Fairfax County Supplied)

Pickup, deliver, and install Fairfax County supplied material.

W. Topdressing (Compost)

Furnish and install organic compost.

X. Sod Installation – Large – Tall Fescue

Perform preparation for sod installation (plow, grind, and grade). Furnish and install large roll (4' x

100') tall fescue sod.

Y. Sod Installation – Small – Tall Fescue

Perform preparation for sod installation (plow, grind, and grade). Furnish and install small roll (2' x 5')

tall fescue sod.



02930-4

Z. Discing (4-6 Passes)

Run a heavy disc across the area being prepared until the soil is broken into hand-sized clods or smaller, requiring four to six passes in different directions.

AA. Soil Preparation- Rip Soil 18" To 24" Deep

Prepare soil eighteen (18") inches to twenty-four (24") inches deep using a deep tine ripper.

BB. Till Soil 6" To 8" Deep

Prepare soil six (6") inches to eight (8") inches deep using a tiller.

CC. Till Soil 19" To 24" Deep

Prepare soil nineteen (19") inches to twenty-four (24") inches deep using a tiller.

DD. Compost Blanket (Or Equal)

Furnish and install weed-free, composted leaf mulch (SoilMate™ or equal) three (3") inch depth compost blanket.

EE. Mycorrhizal And Polymer Gel Soil Supplement

Furnish and install mycorrhizal and polymer gel soil amendment (Roots PHC Tree Saver by LebanonTurf or equal) per manufacturer's specifications.

FF. Compost Blanket (Or Equal) With Discing

Furnish and install weed-free, composted leaf mulch (SoilMate™ or equal) three (3") inch depth compost blanket. Disc six (6") inches deep.

GG. Fertilization – Balanced

Apply a fertilizer with NPK ratio specified in site specific nutrient management plan. Treatment must be done by licensed/certified applicators in accordance with Federal, State, and Local laws and regulations.

HH. Gypsum Application

Furnish gypsum and install at a rate of approximately 850 lbs/ac. Treatment must be done by

licensed/certified applicators in accordance with Federal, State, and Local laws and regulations.

Application rate is applied according to site specific nutrient management plan, when applicable.

II. Lime Application

Furnish lime and install at a rate of approximately 1,000 lbs/ac. Treatment must be done by

licensed/certified applicators in accordance with Federal, State, and Local laws and regulations.

Application rate is applied according to site specific nutrient management plan, when applicable.

JJ. Soil Amendments

Furnish, deliver, and apply soil amendments according to recommendations derived from the annual

soil analytical test (Line Item 02610-I).



02930-5

KK. Soil Augmentation - Green Roof Filter Media

Furnish, deliver, and install green roof filter media/soil of the type included in construction drawings,

manufacturer recommendations, or equal.

At a minimum, this filter media conforms to the Virginia DEQ Stormwater Design Specification No.5,

which includes design and material specifications. The specialized material is typically composed of

approximately 80% to 90% lightweight inorganic materials, such as expanded slates, shales or clays,

pumice, scoria or other similar materials. The remaining media contains no more than 20% organic

matter, normally well-aged compost. The growing media has a maximum water retention capacity of

around 30%. The filter media is able to meet tests to confirm all material specifications.

LL. Field Rolling

Perform field rolling using dual drum 1 direction roller.

MM. Vertical Core Extraction - 1 Direction (3.33"x 3.33")

Perform vertical core extraction with approximately 3.33" x 3.33" hole pattern.

NN. Winter Blanket Rental, Installation, Removal (12' x 75')

Furnish, install and remove 12' x 75' blankets.

OO. Winter Blanket Rental, Installation, Removal (60' x 66')


PP. Winter Blanket Rental, Installation, Removal (90' x 90')




SECTION 02950 - PLANTS

02950-1

A. Plant Cuttings

Cut and plant cuttings of Sedum spp. and other such approved plants to restore vegetative cover and

provide for at least one watering.

B. Sedum Mats

Furnish and install sedum mats and provide at least one watering.

C. Green Roof Modular Tray Unit

Furnish and install modular tray unit according to the planting plan unless otherwise directed by the

County Project Manager and provide at least one watering. Trays are typically 2 feet by 4 feet.

D. N/A

E. N/A

F. N/A

G. N/A

H. Hydromulching

Furnish and apply hydraulic mulch. The hydraulically-applied material contains any blend of defibrated

paper, wood, cellulose or natural fibers, and a tacking agent.

I. 3/4" Caliper Tree

Furnish and install 3/4" caliper tree according to the planting plan unless otherwise directed by the County Project Manager. Height, root ball/container size by plant species per ANSI Z60. A two (2") deep layer of mulch is installed over all planting areas. Includes warranty.

J. 1" Caliper Tree

Furnish and install one (1") inch caliper tree. Height, root ball/container size by plant species per ANSI Z60. A two (2") deep layer of mulch is installed over all planting areas. Includes warranty.

K. 2" Caliper Tree

Furnish and install two (2") inch caliper tree. Height, root ball/container size by plant species per ANSI Z60. A two (2") deep layer of mulch is installed over all planting areas. Includes warranty.

L. 3-4' Conifer Tree

Furnish and install three (3') foot to four (4') foot tall conifer tree. Height, root ball/container size by plant species per ANSI Z60. Includes warranty.

M. 4-5' Conifer Tree

Furnish and install four (4') foot to five (5') foot tall conifer tree. Height, root ball/container size by plant species per ANSI Z60. Includes warranty.



02950-2

N. 3-4' Broad Leaf Evergreen Tree

Furnish and install three (3') foot to four (4') foot tall broad leaf evergreen tree, ie. Ilex opaca. Height, root ball/container size by plant species per ANSI Z60. Includes warranty.

O. Arborite Tree Guys With Stakes (Or Equal)

Furnish and install Arborite tree guys with stakes or equal.

P. A.M. Leonard Rigid Mesh Tree Protector 36" (Or Equal)

Furnish and install thirty six (36") inch A.M. Leonard rigid mesh tree protector or equal. Remove at end of warranty period or as directed by County Project Manager.

Q. A.M. Leonard Rigid Mesh Tree Protector 48" (Or Equal)

Furnish and install forty eight (48") inch A.M. Leonard rigid mesh tree protector or equal. Remove at end of warranty period or as directed by County Project Manager.

R. Treegator Slow Release Watering Bags

Furnish and install slow release watering bags or equal. Remove at end of warranty period or as directed by County Project Manager.

S. 18" High Shrub

Furnish and install eighteen (18") inch tall shrub according to the planting plan unless otherwise directed by the County Project Manager. Spread, container size, number of canes per plant species per ANSI Z60. Includes warranty.

T. 24" High Shrub

Furnish and install twenty four (24") inch tall shrub. Spread, container size, number of canes per plant species per ANSI Z60. Includes warranty.

U. 30" High Shrub

Furnish and install thirty (30") inch tall shrub. Spread, container size, number of canes per plant species per ANSI Z60. Includes warranty.

V. Herbaceous Plantings (#1 Container Size)

Furnish and install #1 container herbaceous plants according to the planting plan unless otherwise directed by the County Project Manager. Includes warranty.

W. Herbaceous Plantings (#2 Container Size)

Furnish and install #2 container herbaceous plants. Includes warranty.

X. 2" X 4" Aquatic Or Terrestrial Plugs

Furnish and install two (2") inch by four (4") inch aquatic or terrestrial plugs according to the planting plan unless otherwise directed by the County Project Manager. Includes warranty.



02950-3

Y. 2" X 5" Aquatic Or Terrestrial Plugs

Furnish and install two (2") inch by five (5") inch aquatic or terrestrial plugs according to the planting plan unless otherwise directed by the County Project Manager. Includes warranty.

Z. Live Stakes

Furnish and install various tree/shrub live stake species. Includes warranty.

AA. Pick Up County Supplied Plants From Nursery For Planting

Pick up, deliver, and install County supplied plants from nursery as directed by County Project Manager.

BB. Install Plants Provided By Others

Furnish and install various plants as directed by County Project Manager.

CC. 8' High Deer Fence (Black Vinyl Mesh) With Metal Posts

Furnish, install and remove eight (8') foot high, black vinyl mesh deer fence with metal stakes.

DD. 3' Wide Gate In 8' High Deer Fence (Black Vinyl Mesh) With Metal Posts

Furnish, install and remove three (3') foot wide gate in eight (8') foot high black vinyl mesh deer fence with metal stakes.

EE. 8' High Deer Fence (Black Vinyl Mesh) With Pressure Treated Wooden Posts

Furnish, install and remove eight (8') foot high, black vinyl mesh deer fence with pressure treated wooden stakes. The fence includes an access gate.

FF. 3' Wide Gate In 8' High Deer Fence (Black Vinyl Mesh) With Pressure Treated Wooden Posts

Furnish, install and remove three (3') wide gate in eight (8') foot high black vinyl mesh deer fence with pressure treated wooden stakes.

GG. 8' High Deer Fence (Galvanized Woven Wire) With Metal Posts

Furnish, install and remove eight (8') foot high, galvanized woven wire deer fence with metal stakes.

HH. 3' Wide Gate In 8' High Deer Fence (Galvanized Woven Wire) With Metal Posts

Furnish, install and remove three (3') foot wide gate in eight (8') foot high galvanized woven wire deer fence with metal stakes.

II. 8' High Deer Fence (Galvanized Woven Wire) With Pressure Treated Wooden Posts

Furnish, install and remove eight (8') foot high, galvanized woven wire deer fence with pressure treated wooden stakes. The fence includes an access gate.



02950-4

JJ. 3' Wide Gate In 8' High Deer Fence (Galvanized Woven Wire) With Pressure Treated Wooden Posts

Furnish, install and remove three (3') wide gate in eight (8') foot high galvanized woven wire deer fence with pressure treated wooden stakes.

KK. Maintenance of Deer Fence

Provide maintenance of existing deer fence and associated structures.

LL. Goose Fence Protection

Furnish, install and remove thirty (30") inch to thirty six (36") inch tall poultry wire fencing; high tensile single strand smooth wire (12-1/2' gauge, class three galvanized); or 20-pound test, or heavier, monofilament line; metal posts; mylar; and tie wire or zip ties.

MM. Beaver Fence Protection

Furnish, install and remove thirty (30") inch to thirty six (36") inch high wire cylinder, hardware cloth or plastic tree protector to prevent damage to trees from beaver chewing.

NN. Maintenance of Other Animal Protection Fences

Provide maintenance of existing animal protection fences other than deer fencing.

OO. Systemic Animal Browse Deterrents

Furnish and install Repellex© non-toxic deer and rabbit repellants or equal. Apply in accordance with manufacturer's directions.

PP. Topical Animal Browse Deterrents

Furnish and install Repellex© or Liquid Fence© topical non-toxic deer and rabbit repellants or equal. Apply in accordance with manufacturer's directions.

QQ. Application Of Fertilizer

Furnish and apply fertilizer per manufacturer's directions.

RR. Woody Plant Maintenance Per Tree

Provide non-native invasive control around woody plant; up to two (2") DBH. Provide fresh mulch. Remove and replace deer protection.

SS. Woody Plant Maintenance Per Acre

Provide non-native invasive control around all woody plants; up to two (2") DBH. Assume an average of 500 plants per acre. Provide fresh mulch. Remove and replace deer protection.

TT. Selective Cut-Stump Herbicide Treatment

Cut and remove the target plants and immediately treat the outer perimeter, including vascular tissue, of the freshly cut stump with an herbicide [undiluted triclopyr amine plus dye or equal] approved for aquatic use. This treatment method is generally recommended for woody plants under six (6") inches DBH that



02950-5

are not prone to respond with root sprouting. Work must be conducted by a certified applicator. Remove and properly dispose of all material off-site.

UU. Selective Girdle Herbicide Treatment

Girdle the target plants and immediately treat the freshly exposed vascular tissue with an herbicide

[undiluted triclopyr amine plus dye or equal] approved for aquatic use. This treatment method is generally

recommended for woody plants larger than six (6") inches DBH or are prone to root sprout. Work must

be conducted by a certified applicator. Remove and properly dispose of all material off-site.

VV. Selective Foliar Herbicide Treatment

Treat target plants with an herbicide [Glyphosate plus dye or equal] approved for aquatic use. Work must be conducted by a certified applicator. Remove and properly dispose of all material off-site.

WW. Selective Mechanical Removal Of Aquatic Plants

Remove and dispose of target plants from waterbody through the use of machinery designed to cut, shear, shred, crush, press, lift, convey, transport and remove aquatic plants and associated organic material. Remove and properly dispose of all material off-site.

XX. Selective Turf Weed Control

Apply selective weed control with product and rate applicable for invasive and/or common turf weeds

identified in the weed control section of the nutrient management plan and/or identified by County

inspection. Treatment must be done by licensed/certified applicators in accordance with Federal, State,

and Local laws and regulations.

YY. Selective Invasive Woody Vegetation Control

Apply selective invasive woody vegetation control with product and rate applicable for plant to be treated.

Treatment must be done by licensed/certified applicators in accordance with Federal, State, and Local

laws and regulations.

ZZ. Grub Control

Apply Merit or approved equivalent. Treatment must be done by licensed/certified applicators in

accordance with Federal, State, and Local laws and regulations.

AAA. Curative Grub Control

Apply Dylox granular or approved equivalent. Treatment must be done by licensed/certified applicators

in accordance with Federal, State, and Local laws and regulations.

BBB. Nutsedge Control

Apply Sedgehammer or approved equivalent. Treatment must be done by licensed/certified applicators

in accordance with Federal, State, and Local laws and regulations.



02950-6

CCC. Fungicide Control Preventative

Apply broad spectrum preventative. Treatment must be done by licensed/certified applicators in

accordance with Federal, State, and Local laws and regulations.

DDD. Fungicide Control Curative

Apply broad spectrum curative. Treatment must be done by licensed/certified applicators in accordance

with Federal, State, and Local laws and regulations.

EEE. Pest Control (Green Roofs)

Furnish and apply pest control solutions according to any issues identified during routine maintenance

visits. The Contractor must avoid synthetic pesticides or other amendments without the written consent

and approval of the County if viable alternatives are available.

FFF. Water from Offsite Source (Green Roofs)

Water green roof vegetation up to the equivalent of 1 inch of water by furnishing and delivering water to

the roof and applying evenly over the vegetated areas. Off-site supplied water is typically approved in

advance by the County.

GGG. Watering Service (Green Roofs)

Water green roof vegetation up to the equivalent of 1 inch of water and applying evenly over the vegetated

areas, preferably using an irrigation system.



SECTION 02970 - TRAFFIC CONTROL

02970-1

A. Lane Closure Equipment

Includes all cones, drums, arrow boards, pavement markings, etc. necessary to close one lane of traffic

for one day.

B. Variable Message Signs

Daily charge for equipment rental time that the equipment is in use only.

C. Construction Signs


D. Temporary Pre-cast Concrete Barriers


E. Steel Plates 1” Thick 5’x8’ Per Daily Rental

