20061144 Ver 5_More Info Received_20090617

ARCADIS
Ms. Cyndi Karoly
N.C. Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
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Subject:
City of Raleigh Dempsey E. Benton Water Treatment Plant Project - Permit
Modification Request - UT to Walnut Creek
Response to Request for More Information dated 11 June 2009
DWQ Project # 06-1144 Ver. 5
Dear Cyndi:
This letter and its attachments have been generated in response to the Request for
More Information generated by the Division of Water Quality (DWQ) on 11 June 2009
relative to the above referenced project. The items listed in the Request for More
Information and the responses are provided below.
Please indicate all stream impacts including all fill slopes, dissipaters,
and bank stabilization on the site plan. All stream impacts are shown on
the attached figures.
2. Please clearly explain in narrative and design plans what the intent of
the project is. The intent of the project is to repair inadvertent stream
damage that occurred from the stream collapsing into a directional drill tunnel
during a heavy storm event. Workers were onsite during the collapse and
immediately installed a cofferdam upstream of the collapse and started
bypass pumping the stream around the area of impact. At present, the
stream is still being bypass pumped and restoration has not occurred.
Work includes returning the streambed and banks to their original profile and
stabilizing the stream banks. The directional drill tunnel will be filled in, the
streambed will be graded to match the plan and profile of the abutting,
unimpacted stream channel, the stream banks will be graded to match the
abutting, unimpacted stream banks, the stream banks will be stabilized per
the attached details, and the upland areas will be seeded per the attached
project specifications.
3. Please provide an existing conditions map of the impact site showing
the cofferdams and bypass area. Figure 3, which is attached, depicts the
existing conditions of the site.
ARCADIS
801 Corporate Center Drive
Suite 300
Raleigh
North Carolina 27607
Tel [phone]
Fax [phone]
www.arcadis-us.com
WATER RESOURCES
Date:
17 June 2009
Contact.
Linda Diebolt
Phone:
919.854.1282
Email:
[e-mail]
Our ref:
NC705008.2000
ARCADIS
4. Please provide a restoration/bank stabilization plan, including a
planting plan, cross-section, and longitudinal views. Detail sheets for the
project are attached. These details include temporary check dam, synthetic
matting, equipment stream crossing, and stream bank stabilization. The
upland areas of impact will be seeded upon completion of the restoration
activities. The Fertilizing, Seeding, and Mulching specifications for the project
are attached (Section 02420). The seed mixture used within jurisdictional
wetlands differs from the attached specification; however, none of the buffer
areas included in this permit application are within jurisdictional wetlands.
5. Please enumerate all riparian buffer impacts on the site plan and clearly
label impacts (Buffer Impact 1, etc.). Riparian buffer impacts are shown
and labeled on the attached figures.
6. Please locate all isolated or non-isolated wetlands, streams, and other
waters of the State as overlays on the site plan. All state and federal
jurisdictional wetlands and streams are shown on the attached figures. Other
than the UT to Walnut Creek, no federal or state jurisdictional areas are
present within the project area.
7. Please locate all of the protected riparian buffers as overlays on the
site plan, showing Zone 1 and Zone 2. All areas of Zone 1 and Zone 2 of
the riparian buffers impacted by the proposed project are shown on the
attached figures.
Please feel free to call or e-mail me at [e-mail] if you have any
questions or require additional information.
Sincerely,
ARCADIS
C_
Y ?.
Linda Diebolt
Senior Scientist
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Copies:
City of Raleigh - Dale Crisp
ARCADIS - Nichole Johnson
Cyndi Karoly
17 June 2009
Page:
2/2

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Transmission Main Route

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PLAN VIEW
Dempsey E. Benton WTP Figure
City of Raleigh 3
0 100 200 400
Feet
1 inch = 200 feet

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1 40 EXIT 299 RAMP EB

WALKER ST
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UT to Walnut Creek
Temporary impact to 110 feet of intermittent stream
Buffer Impacts:
Zone 1: 6,600 square feet
Zone 2: 2,200 square feet

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140 WB

HAMMOND RD TO 140 RAMP WB
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1 40 EXIT 299 RAMP EB

Legend
Transmission Main Route
® Area of Stream and/or Buffer Impact
Neuse River Buffer - Zone 1
Neuse River Buffer
Surface Waters
PLAN VIEW
Dempsey E. Benton WTP
City of Raleigh
0 50 100 200
Feet
1 inch = 100 feet

Figure
4
SECTION 02420
FERTILIZING, SEEDING, AND MULCHING
PART 1 GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions, and Division 1 through 15 Specification sections, apply to work of this section.
1.2 DESCRIPTION OF WORK
A. Permanent Seeding: Permanent seeding is required for all areas disturbed by construction,
except for areas covered by structures, pavements, etc. Permanent ground cover shall be
provided for all disturbed areas within 15 working days or 90 calendar days (which-ever is
shorter) when final grade is obtained and not otherwise covered.
B. Temporary Seeding: Temporary seeding is required for those areas disturbed by construction
and left exposed for periods of 21 working days or more before being brought to final grade
and permanently seeded.
1.3 QUALITY ASSURANCE
A. Codes and Standards: In general, follow procedures and guides published by the Soil
Conservation Service, United States Department of Agriculture.
B. Soil Tests: Secure minimum of 1 standard soil sample per acre. Submit samples to North
Carolina Department of Agriculture for analysis and recommendations for addition of lime
and other amendments. Submit recommendations to Engineer for review.
1.4 SUBMITTALS
A. Submit material certificates signed by the supplier that the materials used for fertilizing,
seeding, and mulching comply with these specifications.
PART 2 PRODUCTS
2.1 FERTILIZER
A. Provide 10-10-10 commercial fertilizer conforming to statutory requirements and all rules and
regulations adopted by the North Carolina Board of Agriculture.
2.2 LIMESTONE
CITY OF RALEIGH, NORTH CAROLINA FERTILIZING, SEEDING, AND MULCHING
Dempsey E. Benton WTP Water Transmission Main - Phase 3 02420 - 1
ARCADIS G&M of North Carolina, Inc. Printed: 6/16/2009
Project No. NC705008.0000
A. Provide limestone conforming to all statutory requirements and all rules and regulations
adopted by the North Carolina Board of Agriculture. Apply ground agricultural limestone at
the rate of 2-3 tons per acre
2.3 SEED
A. Provide seed conforming to all statutory requirements and all rules and regulations adopted by
the North Carolina Department of Agriculture.
B. Provide seed mixtures as tabulated below. Deliver to site in original containers bearing the
appropriate guaranteed mixtures. Seed shall show a purity of not less than 90 percent and
germination quality of not less than 85 percent.
1. Permanent for slopes flatter than 4 horizontal to one vertical (<4:1 slope):
Mixture:
200 lbs/ac of at least 3
turf-type Tall Fescue varieties: August to mid October
70 lbs/ac Bermudagrass Mid February to mid April
2. Permanent for slopes equal to or steeper than 4 horizontal to one vertical (>4:1 slope):
Mixture:
80 lbs/ac Tall Fescue
50 lbs/ac Pensacola Bahiagrass
40 lbs/ac Kobe Lespedeza
Seeding Dates: Mid February to end April
Early September to end October
Notes: From mid-April through mid-August add 10 lbs/ac German millet or 15 lbs/ac
Sudangrass.
3. Temporary:
120 lbs/ac Rye Grain: Mid August to mid April
40 lbs/ac German Millet: Mid April to mid August
4. Other mixtures as recommended by the Soil Conservation Service may be considered.
2.4 MULCH
A. Mulch all seeded areas except where jute mesh is required. Use undamaged, air-dry, threshed
small grain straw free of undesirable weed seed. Apply emulsified asphalt tack at a rate of
0.10 gallons per square yard.
B. Spread mulch by hand or with a mulch blower. When spreading straw mulch by hand, divide
the area to be mulched into sections of approximately 1,000 ft2, and place 70-90 lb of straw (1
1/2 to 2 bales) in each section to facilitate uniform distribution. After spreading mulch, no more
than 25% of the ground surface shall be visible.
2.5 ROLLED EROSION CONTROL
A. Use rolled erosion control (REC) on seeded areas where slope is steeper than 2 horizontal to
one vertical (2:1 slope). Use REC weighing approximately 90 lbs. per 100 sq. yds. and having
3/4" openings. REC should withstand channel velocity up to 6 feet per second.
CITY OF RALEIGH, NORTH CAROLINA FERTILIZING, SEEDING, AND MULCHING
Dempsey E. Benton WTP Water Transmission Main - Phase 3 02420 - 2
ARCADIS G&M of North Carolina, Inc. Printed: 6/16/2009
Project No. NC705008.0000
B. Anchor the rolled erosion control using 11 gauge, at least 6in length by 1 in wide staples or
12in minimum length wooden stakes. Drive staples or stakes so that the top is flush with the
ground surface. Anchor each REC every 3 feet along it's center. Longitudinal overlaps must
be sufficient enough to accommodate a row of anchors and be uniform along the entire length
of overlap. Anchor every 3 feet along the overlap length.
PART 3 EXECUTION
3.1 GENERAL
A. Follow procedures set forth in the publication "Guide for Sediment Control on Construction
Sites in North Carolina" by the United States Department of Agriculture, Soil Conservation
Service, and as specified herein.
3.2 SEED BED PREPARATION
A. Remove all grass and weeds and shape overall area to even out high and low spots
B. Spread a minimum of 3 inches of topsoil over all disturbed areas to the finished grade as
shown on the drawings.
C. Scarify soil to a depth of 3 inches and work into a satisfactory seed bed by discing, use of
cultipackers, harrows, drags or other approved means.
D. Preparation outlined above shall not be done when the soil is frozen, wet or otherwise in an
unfavorable condition.
E. Begin and complete seeding operations as outlined below as soon as possible after final or
intermediate grading is completed.
F. Distribute lime and fertilizer, as required, uniformly over seed bed and harrow, rake, or
otherwise work same into seed bed.
G. Distribute seed uniformly over seed bed. Lightly rake surface of seed bed to cover seed to a
maximum depth of 1 /4 inch.
H. Compact seed bed after covering seed with an approved roller or drag.
1. No lime, fertilizer, or seed shall be applied during a strong wind, when soil is wet or otherwise
unworkable. Should rain follow seeding before rolling is begun, the bed shall not be rolled.
No rip-rap is to be placed along the banks of new fill. Maintain the area and repair any
erosion damage until a permanent ground cover is established. Use mulch or mesh as
required.
3.3 PERMANENT SEEDING
A. Application of Lime, Fertilizer, and Seed:
CITY OF RALEIGH, NORTH CAROLINA FERTILIZING, SEEDING, AND MULCHING
Dempsey E. Benton WTP Water Transmission Main - Phase 3 02420 - 3
ARCADIS G&M of North Carolina, Inc. Printed: 6/16/2009
Project No. NC705008.0000
1. Lime with 40 lbs. per 1,000 sq. ft. before seeding.
2. Fertilize with 15 lbs. per 1,000 sq. ft. when seeding. Top dress with 10 lbs. per 1,000 sq.
ft. when cover is established.
3. Provide permanent seeding to completed areas during the permanent seeding period. If
grading is completed at times other than the recommended season, provide temporary
seeding or other protection approved by the Engineer until the appropriate planting
season begins.
3.4 TEMPORARY SEEDING
A. Application of Fertilizer and Seed:
1. Fertilize with 15 lbs. per 1,000 sq. ft. when seeding. Top dress with 10 lbs. per 1,000 sq.
ft. when cover is established.
2. Between February and May and September and November, seed with 130 lbs. per acre of
Rye; between June and August seed with 40 lbs. per acre of Browntop Millet.
3.5 APPLICATION OF MULCH AND JUTE MESH
A. Apply mulch at the rate of 100 lbs. per 1,000 sq. ft. Anchor with asphalt or other approved
method.
B. Apply jute mesh according to the manufacturer's recommendations. Anchor with steel hairpin
shaped wire staples.
3.6 REPAIR AND MAINTENANCE
A. Maintain the grass on the area for a period of 90 days after the grass growth appears. Reseed
bare areas and repair all eroded areas during that period.
END OF SECTION
CITY OF RALEIGH, NORTH CAROLINA FERTILIZING, SEEDING, AND MULCHING
Dempsey E. Benton WTP Water Transmission Main - Phase 3 02420 - 4
ARCADIS G&M of North Carolina, Inc. Printed: 6/16/2009
Project No. NC705008.0000