20200793 Ver 1_More Info Received_20200724

($ Stantec
July 24, 2020
Stantec Consulting Services
56 College Street, Suite 201
Asheville NC 28801
File: Little Ivy Stream Mitigation Project
Madison County, North Carolina
French Broad River CU 06010105
A/E Project ID No. 172621108
Attention: Andrew Moore, Environmental Specialist II
Water Quality Regional Operations Section
North Carolina Department of Environmental Quality
2090 US Hwy 70
Swannanoa, NC 28778
Reference: 401 Review - Request for Additional Information
Dear Mr. Moore,
Stantec has received the request for additional information provided by the Water Quality Regional
Operations Section for the 401 Review. The following is the response to that request
Comment: (1) The Division understands that, due to the size of the watershed, Condition 11.9. of 401
General Water Quality Certification 4134 cannot be met for the project. Please provide additional
details regarding construction techniques, sequencing, and BMPS, both in -stream and in upland
areas, that will be implemented to control sediment and erosion so that no violations of state water
quality standards, statutes, or rules occur. [15A NCAC 02H .0506 (b) (2) and 15A NCAC 02B .0200]
Response: The following language will be added to the Final Construction Plans, Typical Notes, Sheet
2A, under the heading, "Construction Sequence:"
CONSTRUCTION SEQUENCE
THE CONTRACTOR SHALL FOLLOW THE SEQUENCE OF CONSTRUCTION IN ACCORDANCE WITH THE
PLANS AND AS DIRECTED BY THE ENGINEER.
THE CONTRACTOR SHALL CONDUCT STREAM WORK, INCLUDING INSTALLATION OF IN -STREAM
STRUCTURES, GRADING, STABILIZATION MEASURES, AND SEEDING AND MULCHING, ON A LIMITED
SECTION OF STREAM IN ORDER TO AVOID AN EXCESSIVE DISTURBED AREA AS APPROVED BY THE
ENGINEER.
Design with community in mind

July 24, 2020
Andrew Moore - Environmental Specialist II
Page 2 of 3
Reference: 401 Review - Request for Additional Information
1. THE CONTRACTOR SHALL IDENTIFY THE PROJECT BOUNDARY, LIMITS OF DISTURBANCE,
SENSITIVE AREAS, STAGING AREAS, AND CONSTRUCTION ENTRANCES WITH THE ENGINEER.
2. THE CONTRACTOR SHALL PREPARE STABILIZED CONSTRUCTION ENTRANCES IN ACCORDANCE
WITH LOCAL, STATE AND FEDERAL REQUIREMENTS OR AS DIRECTED BY THE ENGINEER.
3. THE CONTRACTOR SHALL MOBILIZE EQUIPMENT, MATERIALS, PREPARE STAGING AREAS, AND
STOCKPILE AREAS IN ACCORDANCE WITH LOCAL, STATE AND FEDERAL REQUIREMENTS OR AS
DIRECTED BY THE ENGINEER.
4. CONSTRUCTION TRAFFIC TO BE LIMITED TO "LIMITS OF DISTURBANCE" AS INDICATED
ON THE CONSTRUCTION PLANS AND AS DIRECTED BY THE ENGINEER.
5. THE CONTRACTOR SHALL INSTALL ALL TEMPORARY ROCK CHECK DAMS, SILT FENCE, TREE
PROTECTION FENCE, AND MULCHING AROUND ALL CONSTRUCTION AREAS INCLUDING
STAGING AND STOCKPILE AREAS AS INDICATED ON THE CONSTRUCTION PLANS AND AS
DIRECTED BY THE ENGINEER.
b. THE CONTRACTOR SHALL INSTALL TEMPORARY STREAM CROSSINGS AS SHOWN ON THE PLANS
OR AS DIRECTED BY THE ENGINEER. DITCHES AND STREAM REACHES WILL BE LEFT OPEN
DURING INITIAL PHASES OF CONSTRUCTION TO ALLOW FOR DRAINAGE AND TO KEEP SITE
ACCESSIBLE. TEMPORARY STREAM CROSSINGS SHALL CONSIST OF TEMPORARY, STABILIZED
FORD CROSSINGS INSTALLED PERPENDICULAR TO THE CHANNEL.
7. CONSTRUCTION ACTIVITIES ASSOCIATED WITH THE CONSTRUCTION OF THE CHANNEL BED,
CHANNEL BANKS, IN -STREAM STRUCTURES, AND STABILIZATION MEASURES MAY REQUIRE THAT
CONSTRUCTION OCCURS IN THE ACTIVE CHANNEL (IN FLOWING WATER). WHENEVER
POSSIBLE, THE CONTRACTOR SHALL LIMIT EQUIPMENT TIME SPENT IN ACTIVE FLOW. THIS SHALL
BE ACCOMPLISHED BY STAGING ALL REQUIRED MATERIALS ADJACENT TO THE WORK AREA TO
MINIMIZE DWELL TIME, UTILIZING NATIVE COBBLES TO CONSTRUCT COFFER DAMS TO SHUNT
ACTIVE FLOW AWAY FROM WORK AREA AND BUILDING FROM THE BANK WHERE
PRACTICABLE.
8. THE CONTRACTOR SHALL BEGIN CLEARING, FLOODPLAIN EXCAVATION, AND GRADING
WORK TO DESIGN GRADES AT THE UPSTREAM END OF EACH CHANNEL AS INDICATED ON THE
CONSTRUCTION PLANS. THE CONTRACTOR SHALL NOT DISTURB ANY MORE FLOODPLAIN AREA
AND STREAM REACH THAN NECESSARY TO COMPLETE THE WORK AND SHALL ONLY DISTURB
AS MUCH AREA AS CAN BE COMPLETED AND STABILIZED IN ONE WORKING DAY.
9. THE CONTRACTOR SHALL CLOSELY MONITOR SHORT- AND MID-TERM WEATHER FORECASTS
AND SHALL ADJUST DAILY PLANNED WORK TO ALLOW FOR COMPLETE STABILIZATION OF
DISTURBED AREA AHEAD OF ANY SIGNIFICANT FORECAST RAIN EVENTS.
10. WHENVER POSSIBLE, THE CONTRACTOR SHALL BUILD OFFLINE PORTIONS OF PROPOSED
CHANNEL IN A MANNER SUCH THAT THE WORK AREA REMAINS ISOLATED FROM ACTIVE FLOW.
11. ONCE A SECTION OF STREAM AND FLOODPLAIN HAS BEEN EXCAVATED TO DESIGN GRADES,
IN -STREAM STRUCTURES, MATTING AND TRANSPLANTS SHALL BE INSTALLED IN THAT SECTION.
12. THE CONTRACTOR SHALL BEGIN INSTALLING IN -STREAM STRUCTURES FROM THE UPSTREAM
SECTION WORKING DOWNSTREAM. IF EXCESSIVE SEDIMENTATION DOWNSTREAM BECOMES A
CONCERN, THE ENGINEER OR PROJECT MANAGER IN CHARGE MAY DIRECT THE
Design with community in mind

July 24, 2020
Andrew Moore - Environmental Specialist II
Page 3 of 3
Reference: 401 Review - Request for Additional Information
CONTRACTOR TO INSTALL A TEMPORARY ROCK CHECK DAM AND SETTLING BASIN
DOWNSTREAM. THIS MAY BE ACCOMPLISHED BY UTILIZING EXISING POOLS IN CONJUNCTION
WITH NATIVE COBBLES ADDED TO THE DOWNSTREAM HEAD OF RIFFLE TO INCREASE POOL
DEPTH. THIS AREA IS TO BE MAINTAINED ON A REGULAR BASIS BY THE CONTRACTOR.
13. THE CONTRACTOR SHALL CONDUCT AQUATIC ANIMAL RESCUE/RELOCATION EFFORTS WHEN
DEWATERING A STREAM REACH OR PRIOR TO BACKFILLING AN EXISTING STREAM REACH. THIS
SHALL CONSIST OF, AT A MINIMUM, COLLECTING AQUATIC SPECIES IN BUCKETS OR SEIN NETS
AND MOVING THEM TO A SAFE UPSTREAM (PREFERRED) OR DOWNSTREAM LOCATION.
14. ONCE A LENGTH OF STREAM WORK IS COMPLETE, THE CONTRACTOR WILL APPLY TEMPORARY
SEEDING, PERMANENT SEEDING, AND MULCH TO ALL AREAS DISTURBED DURING
CONSTRUCTION. TEMPORARY AND PERMANENT SEEDING MIXTURES WILL BE APPLIED AS
SHOWN ON THE PLANTING PLAN. TEMPORARY SEEDING WILL BE APPLIED IN ALL AREAS
SUSCEPTIBLE TO EROSION SUCH THAT GROUND COVER IS ESTABLISHED WITHIN 14 CALENDAR
DAYS FOLLOWING COMPLETION OF ANY GRADING PHASE. PERMANENT GROUND COVER
WILL BE ESTABLISHED FOR ALL DISTURBED AREAS WITHIN 14 CALENDAR DAYS FOLLOWING
COMPLETION OF CONSTRUCTION.
15. ALL SEEDING AND MULCHING SHALL BE COMPLETED BEFORE LEAVING THE PROJECT SITE
ALONG WITH REMOVAL OF ANY TEMPORARY STREAM CROSSINGS AND TEMPORARY CHECK
DAMS.
16. THE CONTRACTOR OR OTHER QUALIFIED PERSONNEL SHALL INSTALL LIVE STAKING
ACCORDING TO THE PLANTING DETAILS AND SPECIFICATIONS. ALL PERMANENT SEEDING AND
PLANTINGS SHALL BE PERFORMED DURING THE APPROPRIATE TIME OF YEAR AS INDICATED IN
THE PLANTING DETAILS.
17. THE CONTRACTOR SHALL ENSURE THAT THE SITE IS FREE OF TRASH AND LEFTOVER MATERIALS
PRIOR TO DEMOBILIZATION OF EQUIPMENT FROM THE SITE.
Thank you for the opportunity to respond to this request for additional information. Please do not
hesitate to reach out if any additional questions arise or if any further clarification is necessary.
Respectfully,
6 7
J
Christopher Engle, PE
Associate
Phone: [phone]
[e-mail]
Design with community in mind