NCG520128_Renewal (Application)_20230824

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ROY COOPER
Governor
ELIZABETH S.BISER
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
August 24, 2023
Ameri-Con Materials, Inc.
Attn: Jason Deck
2554 Deep Gap Farm Rd
Mill Spring, NC 28756
Subject: Permit Renewal
Application No. NCG520128
Ameri-CON Materials, Inc-Adger Mine
Polk County
Dear Applicant:
The Water Quality Permitting Section acknowledges receipt of your application for a new NPDES WW permit, including
supporting documentation and your check number 511955 in the amount of $100.00 as payment of the application fee.
These items were received in our offices on August 24, 2023. Your application will be assigned to a permit writer within
the Section's NPDES WW permitting branch. The permit writer will contact you if additional information is required to
complete evaluation of your application. Your timely and direct response to any such request will help to expedite the
review process. Please note that acceptance of the application does not guarantee a NPDES permit will be issued for the
proposed activity. A permit will only be issued following a complete review of the application, concluding the proposed
discharge is allowable per applicable statutes and rules.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deg nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
cc: S&ME, Inc.
ec: WQPS Laserfiche File w/application
„ North Carolina Department of Environmental Quality I Division of Water Resourc
Asheville Regional Office 2090 U.S.Highway 70 Swannanoa.North Carolina 287es
78
a.= tr+er6N /'" 828 296.4500

Letter of Transmittal SAME, Inc.
301 Zima Park Drive
Spartanburg, South Carolina 29301
Phone: [phone]
Fax: [phone]
To: Division of Water Resources Lexington
..._
Greensboro
Tri-Cities+ +
NCDEQ- NPDES Permitting Section Knoxville Mooresville Raleigh
Firm: Nashville+ +Asheville• Charlotte
+Fayetteville
Sevierville+ +Spartanburg
Chattanooga , -.Wilmington
1617 Mail Service Center, Raleigh, NC 27699- �aemllle
Florence
Location: viha Columbia Myrtle Beach
1617 Augusta -Charleston
From: Jeff Lindsey -Savannah
Date: 8-21-23
Orlando
Ameri-Con Materials - Proposed Lake Adger t Tampa
Project: Sand Mine
Office Locations
WE ARE SENDING YOU: ❑ Attached ® Enclosed
The Following Items: ❑ Prints ❑ Plans ❑ Samples ❑ Invoice
❑ Proposal ❑ Shop Drawings ❑ Report ® Application
Via: ❑ Standard USPS Mail ® Fed Ex ❑ Hand ❑ Pick Up
Delivery
COPIES DATE DESCRIPTION ��������
3 8-21-23 Application for Coverage under General Permit NCG520000
1 8-21-23 Check for Application fee of $100 Alik 2 4 2023
THESE ARE TRANSMITTED AS CHECKED BELOW: NCDEQIDWRINPDES
❑ For Your Approval ❑ For Review and Comment
® For Your Use ❑ For Bids Due:
❑ As Requested ❑ Other:
On behalf of Jason Deck with Ameri-Con Materials, please see the attached Application for
Comments: General Permit coverage for the proposed Lake Adger Sand ine. A separate mining permit
application is beingprepared for submittal to NC E _
PP
SEtME Project
Number: 4226-20-041 Ph. 450A Signed:
Copies To:
This Letter of Transmittal and the documents accompanying this Letter of Transmittal contain information from S&ME, Inc.,
which is confidential and legally privileged. The information is intended only for the use of the individual or entity named on
this Letter of Transmittal. If you are not the intended recipient, you are hereby notified that any disclosure, copying,
distribution or the taking of any action in reliance on these documents is strictly prohibited.

1
,yds0 STNI q, FOR AGENCY USE ONLY
411, � Date Received
!ie i .......
'. Year Month Day
V 4
3
o0 c2
Certificate of Coverage
NORTH CAROJNA NC G 5 2 ltA
Environmental Quality
Check# Amount
NCDEQ / Division of Water Resources 51115S g LOO
National Pollutant Discharge Elimination System Assigned To:
Application for Coverage Under General Permit
NCG520000
Sand Dredging operations and similar point source discharges
NOTICE OF INTENT
[Required by 15A NCAC 02H .0127(d); Term definition see 15A NCAC 02H .0103(19)]
(Please print or type)
1) Mailing address of owner/operator: (address to which all correspondence should be mailed)
Company Name: Ameri-CON Materials Inc.
Owner Name: Jason Deck
Street Address: 2554 Deep Gap Farm Road
City: Mill Spring State: NC ZIP Code: 28756
Telephone No.: 828 817-0544 Fax:
Email : [e-mail]
2) Location of facility producing discharge:
Facility Name: Ameri-CON Materials - Adger Mine
Facility Contact: Jason Deck
Street Address: 480 Palmer Road
City: Mill Spring State: NC ZIP Code: 28756
County: Polk
Telephone No.: 828 817-0544 Fax:
3) Physical location information:
Please provide a narrative description of how to get to the facility(use street names, state road
numbers, and distance and direction from a roadway intersection).
From 1-26 in Polk County take exit 66 for US-74 E toward Forest City/Shelby.Take exit 163 toward NC-108 E.
Continue on NC-108 E.Turn left onto Wolverine Trail. Turn left onto Silver Creek Rd. Turn left onto Palmer Rd.
(A copy of a county map or USGS quad sheet with facility clearly located on the map is required to be
submitted with this application)
Page 1 of 4

NCG520000 New Application
4) This NPDES permit application applies to which of the following:
ra New [term definition see 15A NCAC 02H .0103(16)] or Proposed
❑ Modification
Please describe the modification:
o Renewal
Please specify existing permit number and original issue date:
5) Does this facility have any other NPDES permits [term definition see 15A NCAC 02H .0103(15)]?
ra No o Yes-If yes, list the permit numbers for all current NPDES permits for this facility:
6) Description of Discharge: [Required by 15A NCAC 02H .0105(c)(1)]
a) Is the discharge directly to the receiving water? ra Yes o No-If no, submit a site map with the
pathway to the potential receiving waters clearly marked. This includes tracing the pathway of the
storm sewer to the discharge point, if the storm sewer is the only viable means of discharge.
b) Number of discharge points(ditches,pipes, channels, etc. that convey wastewater from the
property): One
c) Volume of discharge per each discharge point(in GPD):
#1: 2,300,000 #2: #3: #4:
d) Please describe the type of process the sand dredging wastewater is being discharged from, be
specific:
Sand will be mined from the river bed by means of a hydraulic pump mounted on a barge. The pumped
sand slurry material is transported to the on-site processing plant via pipeline. Wastewater is discharged
to the on site pond for treatment before discharging back into the Green River.
e) Is there any treatment being applied to the wastewater before discharge (check the type of
treatment in use)?:
ra Settling pond o Lagoon o None ❑ Other:
f) How much of the volume discharged is treated(state in percent)? 100%
g) If any box in item(e)above,other than none, was checked,please include design specifics(i.e.,
design volume, retention time, surface area,etc.)with submittal package. Existing treatment
facilities should be described in detail. Design criteria and/operational data(including
calculations)should be provided to ensure that the facility can comply with the requirements of the
General Permit, as required by 15A NCAC 02H .0127.
The treatment shall be sufficient to meet with the limits set by the general permits. The trapping
efficiency should be greater than 75%. The surface area should be as large as possible to insure
sedimentation occurs. To secure optimum efficiency the flow length of the basin to the basin
width should have a ratio of 2:1
Note: Construction of any wastewater treatment facilities requires submission of three(3)sets of
plans and
specifications along with the application. Design of treatment facilities must comply with
requirements of 15A NCAC 02H .0138. If construction applies to this discharge, include the three
sets of plans and specifications with this application.
2

NCG520000 New Application
7) Discharge Frequency: [Required by ISA NCAC 02H .0105(c)(1)]
a) The discharge is: o Continuous ea Intermittent o Seasonal
i) If the discharge is intermittent,describe when the discharge will occur:
Discharge only occurs when site is pumping from the barge.
ii) If seasonal check the month(s)the discharge occurs:
❑ Jan. o Feb. o Mar. o Apr. o May oJun. ❑ Jul. o Aug. ❑ Sept. ❑ Oct. ❑ Nov. ❑ Dec.
b) How many days per week is there a discharge? Monday - Saturday
c) Please check the days discharge occurs: Et Sat. ❑ Sun. a Mon. ra Tue. ra Wed. w Thu. ra Fri.
8) Receiving waters: [Required by 15A NCAC 02H .0105(c)(1)]
a) What is the name of the body or bodies of water(creek,stream,river,lake,etc.)that the facility
wastewater discharges end up in? If the site wastewater discharges to a separate storm sewer
system(4S),name the operator of the 4S(e.g.City of Raleigh). Green River
b) Stream Classification: WS-lV
9) Alternatives to Direct Discharge:
[Evaluation required by G.S. § 143-215.1(b)(5)(a)and 15A NCAC 02H .0105(c)(2)]
Address the feasibility of implementing each of the following non-discharge alternatives
a) Connection to a Municipal or Regional Sewer Collection System
b) Subsurface disposal(including nitrification field,infiltration gallery,injection wells,etc.)
c) Spray irrigation
The alternatives to discharge analysis should include boring logs and/or other information indicating
that a subsurface system is neither feasible nor practical as well as written confirmation indicating that
connection to a POTW is not an option. It should also include a present value of costs analysis as
outlined in the Division's"Engineering Alternatives Analysis(EAA) Guidance Document".
Additional Application Requirements:
For new or proposed discharges,the following information must be included in triplicate with this
application or it will be returned as incomplete. Per 15A NCAC 02H .0105(c)
a) 7.5 minute series USGS topographic map(or a photocopied portion thereof)with discharge
location clearly indicated.
b) Site map, if the discharge is not directly to a stream,the pathway to the receiving stream must be
clearly indicated. This includes tracing the pathway of a storm sewer to its discharge point.
c) If this application is being submitted by a consulting engineer(or engineering firm),include
documentation from the applicant showing that the engineer(Or firm)submitting the application
has been designated an authorized Representative of the applicant;per 15A NCAC 02H
.0138(b)(1).
d) Final plans for the treatment system(if applicable). The plans must be signed and sealed by a
North Carolina registered Professional Engineer and stamped-"Final Design-Not released for
construction;"per 15A NCAC 02H .0139.
3

NCG520000 New Application
e) Final specifications for all major treatment components(if applicable). The specifications must be
signed and sealed by a North Carolina registered Professional Engineer and shall include a
narrative description of the treatment system to be constructed;per 15A NCAC 02H .0139.
CERTIFICATION
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true,complete,and accurate.
Printed Name of Person Signing: Jason Deck
Title: Owner
(Please review 15A NCAC 02H.0106(e)for authorized signing officials)
8-21-23
(Signature ofAppl .t) (Date Signed)
North Carolina General Statute 4 143-215.6B provides that:
Any person who knowingly makes any false statement representation, or certification in any application,
record, report, plan, or other document filed or required to be maintained under this Article or a rule
implementing this Article; or who knowingly makes a false statement of a material fact in a rulemaking
proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly renders
inaccurate any recording or monitoring device or method required to be operated or maintained under this
Article or rules of the Commission implementing this Article, shall be guilty of a Class 2 misdemeanor
which may include a fine not to exceed ten thousand dollars($10,000). 18 U.S.C. Section 1001 provides a
punishment by a fine or imprisonment not more than 5 years,or both,for a similar offense.
Notice of Intent must be accompanied by a check or money order for$100.00 [per G.S. § 143-
215.3(a)(1b)1 made payable to: NCDENR
Mail three(3)copies of the entire package to:
Division of Water Resources
NPDES Permitting Section
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Final Checklist
This application will be returned as incomplete,as allowed by 15A NCAC 02H .0107(b), unless all of
the following items have been included:
ra Check for$100.00 made payable to NCDENR
ra 3 copies of county map or USGS quad sheet with location of facility clearly marked on map
sa 3 copies of this completed application and all supporting documents
ra 3 sets of plans and specifications signed and sealed by a North Carolina P.E.
Thorough responses to items 1-10 on this application
ra Alternatives analysis including present value of costs for all alternatives
Note: The submission of this document does not guarantee the issuance of an NPDES permit
4

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DATE:
III . PROPOSED AMERI-CON MATERIALS LAKE ADGER SAND MINE NOVEMBER 2022 1
480 PALMER ROAD PROJECT NUMBER
MILL SPRING, NORTH CAROLINA 28756 4226-20-041 J

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III `, PROPOSED AMERI-CON MATERIALS LAKE ADGER SAND MINE NOVEMBER 2022
480 PALMER ROAD PROJECT NUMBER
MILL SPRING, NORTH CAROLINA 28756 4226 20 041

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4 + 1 ' r ' l "'r 'Po', 1. C �.' 1. BACKGROUND IMAGERY PROVIDED BY AUTODESK. [--a , Q E.
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E c o�.:. y w �' // - '#loft, '� BOUNDARIES AND BASE FLOOD ELEVATIONS PROVIDED BY —
o N� . / ' y4.' �` y% QUIBBLE AND ASSOCIATES BASED ON COUNTY GIS DATA.If J
o• i. M1 Owir J"M0E / f n ' 3. THE ENTIRE PARCEL IS LOCATED WITHIN THE POLK COUNTY -62
n NNE��.A. � s£oNo1�Pa19/ r 1 � 1 .•^ r� ! • 100—YEAR NO ENCROACHMENT FLOOD HAZARD AREA '-'-I
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`• `. r s POLK COUNTY FLOOOPLAIN DEVELOPMENT PERMIT NO.
,,,A.^as Nora.0 CaN / ' a •11, 2023-01 WAS ISSUED FOR THE SITE ON 2-2-23-
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�uc : DREDGING AS ITS PRIMARY MODE OF OPERATION FOR THE Q
f - \ / �+ ASIQEJ . REMOVAL OF SAND FROM THE GREEN RIVER. THE SUBSTRATE
o '.- * PROPOSED `-- rk ' 'IS; V� , MATERIAL IS PUMPED TO THE SHORE, SCREENED AND SORTED
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A`°c `"" °" P55-571 WHICH CONSISTS OF APPROXIMATELY 1 f3.57 ACRES.
' ' syA - r' p THE ACTUAL MINE WILL CONSIST OF APPROXIMATELY 2.5 SCALE:
l_e ` ' `' # - • « iN !lit *'�-. .. *,r ACRES (—.4-S IF BUFFERS ARE INCLUDED).
� 1 200
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a ,, i, +l r,, _ t C. "-R,. 3. MINIMUM 50` BUFFER FROM MINING OPERATIONS PROVIDED FOR DATE:
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^° 4Lillr, 3 ," ` y �•�4 :,' GREEN RIVER, BRIGHTS CREEK AND ADJACENT WETLANDS
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AREAS 1 '
S
' " ~' �'. ;*�y .. ,, i PROJECT NUMBER
i , • z # 4. THIS DRAWING IS FOR REGULATORY REVIEW USE ONLY AND
_` - 1 .. . RAi. -,ao y � ° SHOULD NOT BE USED FOR CONSTRUCTION. << <'f- 'O 041
• '" # �i, • A `k -' ` 5. SEPARATE ATTACHMENT INCLUDED SHOWING DESIGN AND FIGURE NO.
a-'"' A:emu. .a i .
6 ;. ,, i I le R 1. ! DETAILS FOR SEDIMENT POND.
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Per question 9 of the NCDEQ Division of Water Resources NPDES Application for Coverage under
General Permit NCG520000—Sand Dredging and similar point source discharges Ameri-Con
submits the following feasibility of alternative to direct discharge in red:
9)Alternatives to Direct Discharge:
[Evaluation required by G.S. § 143-215.1(b)(5Xa)and 15A NCAC 02H .0105(c)(2)]
Address the feasibility of implementing each of the following non-discharge alternatives
a)Connection to a Municipal or Regional Sewer Collection System—No Municipal or regional sewer
collection system is present in the vicinity of the subject site.
b)Subsurface disposal(including nitrification field, infiltration gallery,injection wells,etc.)—due to the
anticipated discharge flowrate of the mining operation and the available limited acreage of the actual
mining site,subsurface disposal would not be a viable alternative to direct discharge.
c)Spray irrigation-due to the limited area of the actual mining site and the presence of Bright's Creek to
the south of the site,the Green River to the southeast of the site and wetlands to the north of the site there
would be insufficient land area for the spray irrigation that would be required for the anticipated discharge
flowrate of the mining operation.
Since none of the alternatives are feasible for this site,the present value costs analysis was not performed.

3 I
Barrel conduit = minimum 12 in for smooth pipe
Provided = 24 in. PVC
Cross sectional area of riser >= 1.5 times the cross sectional area of barrel conduit.
Provided = 30 in. PVC
6. Head over riser:
Riser is designed as a suppressed rectangular weir.
Weir equation: Q = CLH'5
Where Q = Flow rate = 3.565 cfs
C = Weir coefficient = 3.33
L = Circumference of the riser = 7.85 ft
Head H = ‘‘3.33
3.565 `0.67
3.33 x 7.85"
= 0.265 ft = 3.2 in.
Assuming minimum 1 ft freeboard between crest of riser and emergency spillway and 1 ft
freeboard between the emergency spillway and top of the embankment, the riser crest elevation
should be at least 2 ft below the top of the pond.
7. Emergency spillway design
Weir equation:Q = CLH15
Where: C = Weir coefficient = 2.8 (reference: NCDEQ Design Manual)
L = Bottom width
H = Depth of the flow above emergency spillway crest = 1 ft
Emergency spillway is designed to carry the pumping rate in case the principal spillway stops
functioning. Hence, flow rate for emergency spillway = pumping rate = 3.565 cfs.
Bottom width L = 3.565
2.9 x(1)^1.5
= 1.27 ft
Provide a 2 ft wide bottom spillway with side slopes of 3:1 or flatter.

Adger Mine Site Sediment Basin Design
NC Surface Water Classification of Brights Creek and Green River:WS-IV
Thus, it is not a High Quality Water(HQW)Zone.
Proposed Dimensions of the sediment basin—96 ft x 46 ft x 6 ft
Pumping flow rate— 1600 GPM = 3.565 cfs
Design:
1. Surface check:
Minimum surface area = 435 sq.ft per cfs of peak inflow
= 435 sq.ft x 3.565 cfs
= 1551 sq.ft
Surface area provided (at principal spillway i.e.,4.5 ft above the bottom of the pond)
= 87ftx37ft
= 3219 sq.ft
2. Volume check:
The minimum volume required is at least 1,800 cu.ft. per acre of disturbed area draining into the
basin.We have no disturbed area draining into the basin. Hence,volume check is not applicable.
3. L:W ratio = 96 ft:46 ft
= 2.1 : 1 > The minimum required ratio of 2 : 1
4. Depth:
Minimum required = 2 ft
Depth provided = 6 ft
5. Principal spillway design:
P P Y 9

WET SEDIMENT BASIN PLAN VIEW 1
I--._ ._.....--- �. MAINTENANCE ACCESS
1 ( (AS NECESSARY)
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WET SE DIMI NT BASIN — GENERAL NO I ES WEI SEDIMENT BASIN -- INSPECTION AND MAINTENANCE 2 4
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1 Seciment basins should not be placed 'n Waters of the State or USGS blue—line 1. The key to a functional sediment basin is weekly inspections, routine 4 0 maintenance, and regular sediment removal. Z
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streams (unless approved by Federal Authorities). �y 2 o_
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2. Attention to sediment accumulations within the basin is extremely important. Q J
2. Sediment tiv basin's side slopesp shall be seeded °formation of rills d, wnen a andry, sgullies. with Accumulated sediment deposition should be continually checked and removed A
vegetative or synthetic matting to prevent the when necessary.
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1 3. Porous Baffles should be composed of coir—based materials or IRMs with a light 3. Remove accumulated sediment when it reaches 50% of the design sediment
penetration (open spaces) between 10-35%. These materials should not have loosestorage volume or 1/2 the height of the riser structure,
straw. Silt Fence may not be used as Porous Baffles. whichever is reached first.
4. Install skimmer and coupling (as necessary) to riser structure at orifice along 4. Removed sediment from the basin shall be placed in stockpile storage
bottom of the principle spillway's riser structure. (Refer to skimmer manufacturer areas or spread thinly across The disturbed area. Stabilize the removed
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for installation procedures and skimmer specifications.) sediment after it is relocated.
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Inspections of sediment basins should be conducted once every calendar
5.
5. Skimmer should equipped with a mechanism, such as a rope, to allow easy
access to skimmer to unciogyed orifice or perform other necessary rrcintenance, week and, as recommended, within 24—hours of each rainfall event that SCALE:
produces '/� -inch or more of precipitation. NONE
t 6. Stormwoter runoff entering the basin must be directed into proper BMPs to DATE:
§ prevent erosion along side slopes and to prevent scour at the basin's inlets. 6. All temporary sediment basins, which ore not to he converted to a 06-DATE:
detention basin post -construction, should be removed within 30 days PROJECTNUMBER
N after final site stabilization is achieved.
F 7. An additional cleanout stake for the forebay area is recommended and should be 4226-20-041
marked for cleanout at 50% of provided sediment storage.
F 7. Disturbed areas resulting from the removal of the sediment basin should be FIGURE NO.
8. The elevation of the emergency spillway should be at least 1 foot below the top permanently stabilized and additional BMPs, such os silt fence, should be
outilized to accept stormwoter runoff from this disturbed area until final
of the embankment. The emergency spillway should not be located on fill material, stabilization is reached.
when possible. Riprop and geotextile liner should be placed on all spillways that
must be located on fill material.

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WET SEDIMENT BASIN SECTIONAL VIEW
SAFETY FENCE
(ALONG PERIMETER}
(AS NECESSARY)
STORMWATER
- BASIN LENGTH - 96' tRU_____NIOFF_IF. s .
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' � tom" ? 1 PERMANENT WATER SURFACE ELEVATION
EMERGENCY SPILLWAY BASIN INLET \2'
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;�; , (SEE DETAIL) / v' 2.5' A --- O ce Q
5' lip - - --- r~ v
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i _ ------ PRINCIPLE 6' 4' CLEANOUT A p I-
-----------BARREL - - SPILLWAY MARK 2' -'' Q Q z
�2, BARREL SLOPE 19:--- ------� I _ 1 z O
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i'S i}l,�lfr1, i ,,Fi. 7. J11-11- iN .r. N W Z
f , .1,, \C. _ RIP_RAP STABILIZATION U
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RIVERSTAKE Q a Y
$ BASIN BOTTOM SLOPE (0.5% MIN.)
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1 EMERGENCY SPILLWAY DETAILcrl
1 -RIP-RAP, 10-INCH D50
N CARD
o GEOTEXTILE FABRIC pP� gsi�</4,
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1 -1 I I—III—I 1 \ 1\---4
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I l 11 = I-�_ SPILLWAY WIDTH _ -�j:'• Le SCALE::
i-4Ii-1I — 11I=I iI—III=11-1 I I-111 III— =�
iII II 1 I11 Iil ,I I 11 Ill'
J 7/� 6 NONE
DATE:
d. ' I III -1II11C��III III III _ III� _1I
06-02-2023
ri 1—III=11 i-11 1-1 11-1 I 1—III=111- PROJECT NUMBER
3 FOR PERMITTING ONLY. 4226-20-041 NOT FOR CONSTRUCTION. FIGURE NO.
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WET SEDIMENT BASIN PLAN VIEW 1
r•_•_•_•...............•_.r.w•AIM.•awn•ow.._.�..••••.•Asa•MOO.r...ems.mow.•molt•mom•_•••IMP•alma•moo•r•Ohm•_•se..ohm.r•_......e_.r._•.1 ! ,
MAINTENANCE ACCESS--
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�,�N CAR0�
so�ottiss�y, \
:11=11�=11=11=1
II Jl .11=11. ° SAL
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L- -- 0 BOTTOM BASIN BASIN WIDTH .: �• tM��'P��
WIDTH 10'
46' �� I — - �'A RD 9 "? 1
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3 �.1.• 1�• 1.• . .. ' /
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LA EMERGENCY SPILLWAY- �" I SAFETY FENCE z
_•_•_ ►�(AS NECESSARY) Q
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1 BOTTOM BASIN a cc
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LENGTH 60' Z 1 a Z
g BASIN LENGTH FOR PERMITTING ONLY. - ? ce
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96 .- NOT FOR CONSTRUCTION. A < Q o
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4 WET SEDIMENT BASIN — GENERAL NOTES WEI SEDIMENT BASIN - INSPECTION AND MAINTENANCE `0-4 2
1 . Sediment basins should not be placed in Waters of the State or USGS blue—line 1. The key to a functional sediment basin is weekly inspections, routine CC O Z
maintenance, and regular sediment removal.
streams (unless approved by Federal Authorities). 2. Attention to sediment accumulations within the basin is extremely important. W w a.
2. Sediment basin's side slopes shall be seeded and, when necessary, stabilized with i..
vegetative or synthetic matting to prevent the formation of rills and gullies. Accumulated sediment deposition should be continually checked and removed A
2 when necessary. 4.4
zil 3. Porous Baffles should be composed of coir—based materials or TRMs with a light
4 penetration (open spaces) between 10-35%. These materials should not have loose 3. Remove accumulated sediment when it reaches 50% of the design sediment
P, straw. Silt Fence may not be used as Porous Baffles. storage volume or 1/2 the height of the riser structure,
s whichever is reached first.
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0 4. Install skimmer and coupling (as necessary) to riser structure at orifice along 4. Removed sediment from the basin shall be placed in stockpile storage
bottom of the principle spillway's riser structure. (Refer to skimmer manufacturer areas or spread thinly across the disturbed area. Stabilize the removed
$ for installation procedures and skimmer specifications.) sediment after it is relocated.
ib
,, 5. Skimmer should be equipped with a mechanism, such as a rope, to allow easy 5. Inspections of sediment basins should be conducted once every calendar
5 access to skimmer to unclogged orifice or perform other necessary maintenance• week and, as recommended, within 24—hours of each rainfall event that SCALE:
g 6. Stormwoter runoff entering the basin must be directed into proper BMPs to produces 1/2 inch or more of precipitation. NONE
revent erosion alon side sloes and to revent scour at the basin's inlets. DATE:2-2
p y p P 6. All temporary sediment basins, which are not to be converted to a 06-02-2023
0- detention basin post -construction, should be removed within 30 days
7. An additional cleanout stake for the forebay area is recommended and should be after final site stabilization is achieved. PROJECT NUMBER
marked for cleanout at 50% of provided sediment storage. 4226-20-041
a
F 7. Disturbed areas resulting from the removal of the sediment basin should be FIGURE NO.
8. The elevation of the emergency spillway should be at least 1 foot below the top permanently stabilized and additional BMPs, such as silt fence, should be
of the embankment. The emergency spillway should not be located on fill material, utilized to accept stormwoter runoff from this disturbed area until final
when possible. Riprop and geotextile liner should be placed on all spillways that stabilization is reached. 2
\ must be located on fill material.