3- Hunley Park SWPPP.pdf

Atriax, pllc.,102 3rd Avenue, NE (28601), PO Box 1629, Hickory, NC 28603, Telephone: (828)-315-9962

INTEGRITY ● SERVICE ● EXCELLENCE

REPAIR STORM DRAINAGE

HUNLEY PARK

SWPPP - Narrative

Contract No. FA4418-10-D-0002

Delivery Order No. 1018

Project: DKFX 13-1048

February 2018

Prepared For:

Joint Base Charleston – Air Base

Submitted by:

A SERVICE DISABLED VETERAN OWNED SMALL

BUSINESS WITH LARGE BUSINESS CAPABILITIES

SWPPP Narrative Repair Storm Drainage Hunley Park

Joint Base Charleston, Air Base North Charleston, South Carolina

DESIGN NARRATIVE

TABLE OF CONTENTS

Cover Sheet

Notice of Intent (NOI) Storm Water Permit Application

Design Narrative

Planned Erosion and Sedimentation Control Practices

Maintenance Plan

Construction Sequence

Site Location Map

Charleston GIS Map

USGS Soil Survey

DHEC-0451 (12/2012) SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL

Notification #: ____________ (For Official Use Only)

Note: This form is for use on projects LOCATED WITHIN THE EIGHT COASTAL COUNTIES (Beaufort, Berkeley, Charleston, Colleton, Dorchester, Georgetown, Horry, and Jasper) and that are NOT part of a larger common plan for development or sale.

Notification Form for Sites Disturbing Less Than 1-Acre, Located within 0.5 Miles of a Coastal Receiving Water and Automatic Permit

Coverage (Not Part of a Larger Common Plan, Coastal County)

Date: ______________ Project/ Site Name: ______________________________________________________ County: ___________________________ I. Project Information

A. Is any portion of this Project’s boundary located within an Urbanized Area or MS4? o Yes o No If yes, list the MS4 Operator or Urbanized Area Name. ______________________________________________________

B. Project Owner/ Operator (Company or person): ____________________________________________________________ Company EIN: __ __ - __ __ __ __ __ __ __ Phone: __________________________ Fax: __________________________ Mailing Address: ______________________________________ City: __________________ State: ____ Zip: __________ Email address: ______________________________________________________________________________________

C. Permit Contact (If Owner Is Company): ___________________________________________________________________ Phone: (Day) __________________ Email Address: ________________________________________________________

II. Property Information A. Site Location (street address, nearest intersection, etc.): _____________________________________________________

Is the Property located Within City Limits? o Yes o No Nearest City/Town: ___________________________________ Latitude: ____°____’____” N Longitude: -____°____’____” W Tax Map # (List All): ______________________________ Tax Map # (Continued): _______________________________________________________________________________

B. Property Owner (if different from section I. B above): __________________________________________________________ Mailing Address: ______________________________________ City: __________________ State: ____ Zip: __________ Phone: (Day) ____________________ Email address: ______________________________________________________

III. Site Information A. Disturbed Area (to the nearest tenth of an acre): ____________ Total Area (to the nearest tenth of an acre): ____________ B. Start Date (MM/DD/YYYY): ____/____/________ Completion Date (MM/DD/YYYY): ____/____/________ C. Are there any Flooding Problems Downstream of or Adjacent to this Site? o Yes o No D. Has S.C. DHEC or MS4 issued a Notice to Comply, Notice of Violation or a Warning Notice for this site or LCP? oYes oNo E. Type of Activity (check all that apply): o Commercial o Industrial o Institutional o Residential: Single-family o Residential: Multi-family o Linear o Other:

o Multi-use (Commercial & Residential) o Site Preparation (No new impervious) ____________________

IV. Waterbody Information A. Nearest Receiving Waterbody(s) [RWB]: ______________ Distance to Nearest RWB (feet): __________________________ B. Drains to Coastal Receiving Water? o Yes o No Distance to Coastal Receiving Water [CRW] (feet): ______________ C. 1. Are there any Waters of the United States/ Waters of the State, jurisdictional or non-jurisdictional wetlands, or any other waters located on site? o Yes o No

2. Are there any impacts to any of the on-site Waters of the U.S./State, jurisdictional or non-jurisdictional wetlands, or any other waters? o Yes o No

D. If checked yes for impacts in item C.2, describe each impact and activity, and list all permits (e.g., USACOE Nationwide Permit, DHEC General Permit) and certifications that have been applied for or obtained for each impact.

V. Signatures and Certifications: DO NOT SIGN IN BLACK INK!

A. Per my signature below, I hereby certify that this project is not part of a Larger Common Plan (LCP) for Development or Sale.

I understand that additional construction activities at this site may require permit coverage and I am responsible for obtaining any federal, state, or local permits that may be required for this project.In the case that the site associated with this project is located within an Urbanized Area (UA) or MS4, I certify that the respective UA or MS4 has been informed about the scope of all land-disturbing construction and associated activity pertaining to this site, and that all additional requirements mandated by the UA or MS4 have been addressed. I certify that all land-disturbing construction and associated activity pertaining to this site shall be accomplished pursuant to and in keeping with the terms and conditions of all relevant laws and regulations, including the Storm Water Management and Sediment Reduction Act of 1991 and the Federal Clean Water Act. Failure to do so may result in penalties. I hereby grant authorization to the Department of Health and Environmental Control and/or the local implementing agency the right of access to the site at all times for the purpose of on site inspections during the course of construction and to perform maintenance inspections following the completion of the land-disturbing activity. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Printed name of Project Owner/Operator Signature of Project Owner/Operator Date mailto:coastalstormwaternotfication@dhec.sc.gov

Less Than 1-Acre, Not Located within 0.5 Miles of a Coastal Receiving Water and Automatic Permit Coverage

Not Part of a Larger Common Plan, Coastal County

Application Instructions This form is for use on projects that will disturb less than 1 acre, are not located within 0.5 miles of a coastal receiving water, and are not a part of Larger Common Plan (LCP) for development or sale. This form is also for use on projects that qualify for Automatic Permit Coverage under the NPDES General Permit for Stormwater Discharges from Construction Activities by disturbing 0.5 acres or less on sites that are located within 0.5 miles of a Coastal Receiving Water (not part of an LCP). Coastal Receiving Waters are receiving water bodies as defined in South Carolina’s Coastal Zone Management Program Refinements including all regularly tidally influenced salt and fresh water marsh areas, all lakes or ponds which are used primarily for public recreation or a public drinking water supply, and other water bodies within the coastal zone, excluding wetlands, swamps, ditches and stormwater management ponds which are not contiguous via an outfall or similar structure with a tidal water body.

This form is only for use on projects located within one of the eight counties comprising the S.C. Coastal Zone (Beaufort, Berkeley, Charleston, Colleton, Dorchester, Georgetown, Horry, and Jasper counties). If this project is part of a LCP for sale or development OR if this project includes more than 0.5 acres of disturbance located within 0.5 miles of a coastal receiving water, this form may not be used. Please see SC DHEC Form d-2617 for the aforementioned scenarios.

Completing the Application:

You must type or print legibly. You must include the original, signed notification form and one (1) copy of a sketched plan outlining the anticipated activities and the location of all proposed sediment and erosion control devices. See Details on Pages 3-4 for additional information.

Project/ Site Name:

The Project/Site Name should be a unique or distinguishing name (e.g., not Proposed Subdivi sion).

I. Project Information A. If any of the property is located inside an urbanized area (UA) or MS4, then list the entity and contact the respective MS4 or UA to identify applicable project requirements. See the following website for information about MS4s: S.C. DHEC MS4 Link. Urbanized area boundary maps are available at the following EPA Link: EPA Urbanized Area Maps Link Please verify boundaries with the MS4 entity as some boundaries may have changed since the urbanized area maps were published.

B. The official or legal name of the Project Owner/Operator (PO/O) should be listed under section B. The Company EIN is the Employer Identification Number as established by the U.S. Internal Revenue Service; the EIN is commonly referred to as the taxpayer ID. If the PO/O is not a company, then do not list a Company EIN. Please provide all requested information including email addresses.

C. If the Project Owner/ Operator is a company, then a Permit Contact person must be listed under section C. This can be someone other than the person that has signatory authority for the company. Please provide all requested information including email addresses.

II. Property Information A. Provide all requested information, including Nearest City/Town even if project is located outside of City Limits. Latitude

(from 32° to 35°) and longitude (78° to 83°) should be for the center of the site to the nearest 15”. Minutes (’) should be from 0 to 59, and seconds (”) should be 0, 15, 30, or 45. List all Tax Map Numbers associated with the property.

B. If the Project Owner/ Operator does not own the project site, then list the official or legal name of the current Property Owner of the site. Exemption Notification will be issued to the Project Owner/Operator (Section I), not the Property Owner, unless same entity.

III. Site Information A. The disturbed area and total site area should be rounded to the nearest tenth of an acre.

B. List the estimated start and completion dates of the construction activity.

C. If there are any downstream or adjacent flooding problems, then mark Yes. Otherwise mark No.

D. If S.C. DHEC or an MS4 has issued a Notice to Comply, Notice of Violation or Warning Notice for this site please check yes.

Otherwise check No.

E. Identify the type of activity on this site by checking all that apply. Institutional includes schools and other publicly owned projects, except Linear projects. Site Preparation includes clearing, grubbing, and grading only; no new impervious areas should be proposed if this activity type is checked.

IV. Water Body Information A. The nearest receiving water body is the nearest Waters of the State (WOS)(see definition in S.C. Regulation 61-9) to which the site’s stormwater will discharge. If this water body is unnamed, then provide a description that references the nearest, named water body (e.g., tributary to Grove Creek). If the site’s stormwater discharges to multiple water bodies, then list all such water bodies and attach additional sheets, if necessary.

B. If your site drains to a Coastal Receiving Water as defined above, then mark Yes. Otherwise mark No. If YES, provide the distance.

C. If there are other waters of the U.S./State on the site not listed in item A (e.g., lake, pond), then mark Yes under item C.1. If there are proposed impacts to these or any WoS, then mark Yes under item C.2. It is also advised that you contact USACOE (866-329-8187), S.C. DHEC Water Quality Certification & Wetlands Section (803-898-4300), and S.C. DHEC Office of Ocean and Coastal Resource Management (843-953-0200) as applicable about these impacts.

D. If items C.1 and C.2 were marked Yes, then describe the scope of all impacts to the referenced Waters of the State and list all permits and certifications that have been applied for or obtained which address each impact.

http://www.scdhec.gov/environment/ocrm/czmp.htm http://www.scdhec.gov/administration/library/d-2617.pdf http://www.scdhec.gov/environment/water/swnsms4.htm http://cfpub.epa.gov/npdes/stormwater/urbanmaps.cfm http://www.scdhec.gov/environment/water/swnsms4.htm http://www.scdhec.gov/environment/water/regs/r61-9.pdf

V. Signatures and Certifications A. If the Project Owner / Operator is a company, print the name of the person who is signing the NOI for the Project Owner

/ Operator. A person with signatory authority for the Project Owner / Operator must sign the application. Certified Digital Signatures through Adobe Reader are accepted.

Where to File: (For projects that are located within the Coastal Zone and are not part of a LCP.) For projects located within an Urbanized Area or MS4, you must first contact the respective UA or MS4 to identify applicable project requirements.

Via Email Via Mail coastalstormwaternotification@dhec.sc.gov (All files must be submitted as PDFs.)

S.C.DHEC—Coastal Stormwater Permitting Section 1362 McMillan Avenue, Suite 400

Charleston, SC 29405

Project Requirements

The following paragraphs provide guidance for projects located within the Coastal Zone that disturb less than one (1) acre, are not located within 0.5 miles of a CRW, and are not part of a larger common plan for development or sale (LCP). The following paragraphs also provide guidance for coastal projects that qualify for Automatic Permit Coverage under the NPDES General Permit for Stormwater Discharges from Construction Activities (NPDES CGP) by disturbing 0.5 acres or less on sites that are located within 0.5 miles of a Coastal Receiving Water (not part of an LCP.) If your project is to be constructed in a MS4 or Urbanized Area, the respective MS4 or UA must be consulted to identify additional project requirements. The Where To Apply guidance may also be consulted for MS4/UA contact information.

Regulatory Basis: The S.C. Stormwater Management and Sediment Reduction Regulations (R.72-300) require that for land disturbing activities involving two (2) acres or less of actual land disturbance which are not part of a larger common plan of development or sale, the person responsible for the land disturbing activity shall submit a simplified stormwater management and sediment control plan meeting the requirements of R.72-307H. In addition to R.72-300, all projects that disturb 1 acre or more are subject to the requirements of the NPDES General Permit for Storm Water Discharges from Construction Activities (NPDES CGP). Additionally, projects may be subject to requirements of local governments through local ordinances, in particular, those areas that are considered Municipal Separate Storm Sewer Systems (MS4s) under the NPDES program. Please see S.C.

DHEC’s MS4 website for more information.

Heightened Coastal Stormwater Requirements – Sites Located Within 0.5 Miles of Coastal Receiving Waters The South Carolina Coastal Zone Management Program Refinements (Program Refinements) call for regulatory approval of small sites that are located within 0.5 miles of a receiving water body as defined in Chapter III, Section XIII of the Program Refinements (See definition of receiving water body located in the instructions for this form). This type of receiving water body is also known as a coastal receiving water for the purposes of permitting requirements. Regulation 61-9, used in developing NPDES permits, defines any construction activity located within 0.5 miles of a coastal receiving water as a “Small Construction Activity”, and therefore subject to coverage under the NPDES CGP. In the NPDES CGP, sites that are located within 0.5 miles of a coastal receiving water and disturb 0.5 acres or less (not part of an LCP) qualify for automatic permit coverage with the use of appropriate best management practices.

For construction activities that include less than one (1) acre of disturbance, are not part of an LCP, where the site is located within

0.5 miles of a coastal receiving water, the following applies:

Submittal Type Size of Construction Activity DHEC Form 0451 Automatic Permit Coverage* (Notification) 0.1 – 0.5 acres 0451 Individual Permit Coverage* 0.6 – 0.9 acres 2617

Definition LCP: The plan in LCP is “broadly defined as any announcement or piece of documentation (including a sign, public notice or hearing, sales pitch, advertisement, drawing, permit application, zoning request, computer design, etc.) or physical demarcation (including boundary signs, lot stakes, surveyor markings, etc.) indicating construction activities may occur on a specific plot.” [63 Federal Register No. 128, July 6, 1998, p. 36491] For example, if master calculations have been prepared and/ or submitted for an entire site, then all phases and parcels at that site would be considered part of an LCP. If the site is part of a subdivision, industrial park, commercial park, etc., then it is considered to be part of an LCP. If there have been land-disturbing activities, including clearing, grading or excavating, that resulted in one (1) disturbed acre or more since 1992, then any future land-disturbing activities at the site are considered to be part of an LCP. If you are unable to determine if a plan is part of a LCP, you may contact the Department or the respective MS4/UA (when applicable) for assistance.

Submittal Requirements: Projects Less Than One (1) Acre, Not Located Within 0.5 Miles of a Coastal Receiving Water AND Automatic Permit Coverage that are not part of an LCP mailto:coastalstormwaternotification@dhec.sc.gov http://www.scdhec.gov/environment/water/swater/apply.htm http://www.scdhec.gov/environment/water/swater/apply.htm

Following is a summary of S.C. DHEC’s submittal requirements for coastal projects that disturb less than one (1) acre and are not located within 0.5 miles of a coastal receiving water OR projects that qualify for Automatic Permit Coverage when either project type is not part of an LCP:

1. Provide one (1) complete (signed and dated) Notification Form for coastal counties (DHEC Form 0451 or other form provided by DHEC. Note: The Notification form must be signed and dated by the Project Owner/Operator.

2. Provide one (1) copy of the plan/sketch. Note: Plan is not required to be prepared by an engineer, Tier B surveyor, or landscape architect; however, if an individual with one of these licenses prepares the plan, then they must sign and seal the plans. The sketched plan should include:

(a) A site location drawing of the proposed project, indicating the location of the proposed project in relation to roadways, jurisdictional boundaries, streams and rivers; (b) The boundary lines of the site on which the work is to be performed; (c) The location of vegetative (temporary and permanent) and structural stormwater management and sediment control measures; and (d) A topographic map of the site (if required by the implementing agency).

3. A narrative description of the stormwater management and sediment control plan to be used during land disturbing activities. Note: This may be included on the plans instead of in a written narrative. Include a general description of topographic and soil conditions of the property. Include a general description of adjacent property and a description of existing structures, buildings, and other fixed improvements located on surrounding properties.

4. Automatic Permit Coverage Only: A Coastal Zone Consistency determination is required for any site that is located within 0.5 miles of a coastal receiving water due to the permit coverage requirement. Contact DHEC’s Office of Ocean and Coastal Resource Management (DHEC-OCRM) for any submittal requirements. Submit CZC submittal directly to DHEC-OCRM.

Once completed, the notification package (form, plans, and narrative) may be e-mailed (as pdf) to coastalstormwaternotification@dhec.sc.gov for electronic processing by the Bureau of Water. A notice of receipt will be e-mailed to the applicant upon successful receipt of the notification package. Once the notification package has been screened for completeness and applicability, a letter requesting additional information or an approval letter will be e-mailed to the project owner/operator at the e-mail address provided on the notification form. A copy of the Notification letter will also be e-mailed to SCDHEC Regional inspectors. If electronic submittal is not possible or desired, Less Than One Acre/Automatic Permit Coverage notifications may be mailed to SCDHEC - Bureau of Water, Coastal Stormwater Section, 1362 McMillan Avenue, Suite 400, Charleston, S.C. 29405.

If the project is to be constructed inside a MS4 or Urbanized Area, you must first contact the respective MS4 or UA to identify applicable project requirements. Please note that these projects are required to provide adequate sediment and erosion controls in order to insure no offsite sedimentation into Waters of the State, adjacent properties, and public right-of-ways. Please also note that the Department does not regulate the placement of fill in floodplains. You must contact your local city or county official for such approval.

http://www.scdhec.gov/environment/ocrm/czc.htm http://www.scdhec.gov/environment/ocrm/czc.htm mailto:CoastalStormwaterNotification@dhec.sc.gov

Atriax, pllc. Contract: FA4418-10-D-0002

February 2018 Delivery Order: 1018

Page 1 of 4 Project: DKFX 13-1048

STORM WATER DESIGN NARRATIVE

Construction Activities:

The project site is located in Hunley Park along Alaska Avenue in Joint Base Charleston, North Charleston, SC. The construction includes relining a corrugated metal stormwater culvert and re-aligning the culvert with a preceding culvert and a following junction box. This project also includes repairing the existing roadway above the culvert, removing and replacing surrounding sidewalk, backfilling eroded areas, realigning a separate disjointed pipe, and the removal and replacement of a concrete plug for one of the outflow pipes in the junction box. For the duration of the construction activities, a perimeter silt fence and sediment tubes will act as the BMPs for erosion control. The disturbed areas will be seeded once construction is completed.

Pre-Developed Conditions:

The corrugated metal stormwater culvert that runs under Alaska Avenue is deteriorating and has become misaligned in the discharge junction box. Areas around the junction box have been eroded away. The total area of disturbance is < 0.1 acres. The soils in the work area consist of 100% Dawhoo and rutlege loamy fine sand (Da) with 10-15 percent slopes and in the

Hydrologic Soil Group “A/D”.

Developed Conditions:

The disturbed areas will be restored to their pre-development conditions. The areas will be disturbed in order to repair drainage pipe and rehabilitation of the existing road. The site drainage is designed in accordance with SCDHEC “Storm Water Best Management Practices

Manual”. The disturbed area is less than 1 acre and not within 0.5 miles of a receiving water body. The nearest receiving body for storm water is the Popperdam Creek/Marsh which is 2300 ft to the south-west (see attached Charleston County GIS). To limit the sediment discharge from the site, silt fence protection will be used around the perimeter and inlet protection on nearby curb inlets and drop inlet. Once construction has been completed all disturbed areas inside the perimeter will be seeded. See plans and details for locations of BMPs, construction, and maintenance notes.

Erosion Control Practices:

1. Inlet protection – The curb inlets and drop inlet located in and near the work area will have silt fence, gravel filters, or sediment tubes preventing sediment from entering the storm drain system. These measures are to be left in place until seed has stabilized.

2. Concrete wash out – wash out areas are to be constructed to prevent migration of small particles to inlets, as needed. See C-501 drawing for details.

Page 2 of 4 Project: DKFX 13-1048

3. Perimeter Silt Fence – A perimeter silt fence will be installed around the entire work area to prevent sediment from leaving the work area.

4. Erodible material staging/storage – all erodible materials must be placed within silt fence perimeter to prevent migration of material to inlets.

Page 3 of 4 Project: DKFX 13-1048

Maintenance Plan

SCDHEC Standard Notes:

1. If necessary, slopes, which exceed eight (8) vertical feet should be stabilized with synthetic or vegetative mats, in addition to hydroseeding. It may be necessary to install temporary slope drains during construction. Temporary berms may be needed until the slope is brought to grade.

2. Stabilization measures shall be initiated as soon as practicable in portions of the site where construction activities have temporarily or permanently ceased, but in no case more fourteen (14) days after work has ceased, except as stated below.

Where stabilization by the 14th day is precluded by snow cover or frozen ground conditions stabilization measures must be initiated as soon as practicable.

Where construction activity on a portion of the site is temporarily ceased, and earth-disturbing activities will be resumed within 14 days, temporary stabilization measures do not have to be initiated on that portion of the site.

3. All sediment and erosion control devices shall be inspected once every calendar week. If periodic inspection or other information indicates that a bmp has been inappropriately, or incorrectly, the permittee must address the necessary replacement or modification required to correct the bmp within 48 hours of identification.

4. Provide silt fence and/or other control devices, as may be required, to control soil erosion during utility construction. All disturbed areas shall be cleaned, graded and stabilized with grassing immediately after the utility installation. Fill, cover, and temporary seeding at the end of each day are recommended. If water is encountered while trenching, the water should be filtered to remove any sediments. Do not pump the filtered water into waters of the state.

5. All erosion control devices shall be properly maintained during all phases of construction until the completion of all construction activities and all disturbed areas have been stabilized.

Additional control devices may be required during construction in order to control erosion and/or offsite sedimentation. All temporary control devices shall be removed once construction is complete and the site is stabilized.

6. The contractor must take necessary action to minimize the tracking of mud onto paved roadway(s) from construction areas and the generation of dust. The contractor shall daily remove mud/soil from pavement, as may be required.

7. Residential subdivisions require erosion control features for infrastructure as well as for individual lot construction. Individual property owners shall follow these plans during construction or obtain approval of an individual plan in accordance with S.C. Reg. 72- 300 et seq. and SCR100000.

8. Temporary division berms and/or ditches will be provided as needed during construction to protect work areas from upslope runoff and/or divert sediment-laden water to appropriate traps or stable outlets.

9. All waters of the state (WOS), including wetlands, are to be flagged or otherwise clearly marked in the field. A double row of silt fence is to be installed in all areas where a 50-foot buffer can't be maintained between the disturbed area and all WOS. A 10-foot buffer should be maintained between the last row of silt fence and all WOS.

10. Litter, construction debris, oils, fuels and building products with significant potential for impact (such as stockpiles of freshly treated lumber) and construction chemicals that could be

Page 4 of 4 Project: DKFX 13-1048 exposed to storm water must be prevented from becoming a pollutant source in storm water discharges.

11. A copy of the SWPPP, inspections records, and rainfall data must be retained at the construction site or a nearby location easily accessible during normal business hours, from the date of commencement of construction activities to the date that final stabilization is reached.

12. Initiate stabilization measures on any exposed steep slope (3H:1V or greater) where land disturbing activities have permanently or temporarily ceased, and will not resume for a period of

7 calendar days.

13. Minimize soil compaction and, unless infeasible, preserve topsoil.

14. Minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. Wash waters must be treated in a sediment basin or alternative control that provides equivalent or better treatment prior to discharge;

15. Minimize the discharge of pollutants from dewatering of trenches and excavated areas.

These discharges are to be routed through appropriate BMPs (sediment basin, filter bag, etc.).

16. The following discharges from sites are prohibited:

Wastewater from washout of concrete, unless managed by an appropriate control;

Wastewater from washout and cleanout of stucco, paint, form release oils, curing

Compounds and other construction materials;

Fuels, oils, or other pollutants used in vehicle and equipment operation and maintenance;

Soaps or solvents used in vehicle and equipment washing.

17. Material delivery and storage areas must be within silt fence perimeter and/or sediment dikes.

18. Storage for heavy and/or large equipment will be on paved surfaces.

19. After construction activities begin, inspections must be conducted at a minimum of at least once every calendar week and must be conducted until final stabilization is reached on all areas of the construction site.

20. If existing BMPs need to be modified or if additional BMPs are necessary to comply with the requirements of this permit and/or SC’s water quality standards, implementation must be completed before the next storm event whenever practicable. If implementation before the next storm event is impracticable, the situation must be documented in the SWPPP and alternative

BMPs must be implemented as soon as reasonably possible.

21. A pre-construction conference must be held for each construction site with an approved on-site SWPPP prior to the implementation of construction activities. For non-linear projects that disturb 10 acres or more this conference must be held on-site unless the department has approved otherwise.

CONSTRUCTION SEQUENCE

1. Install inlet, concrete washout, and erodible materials storage protection where indicated on the plans. Disturbance should be minimal as necessary to install.

2. Begin grading operations.

3. Complete grading operations.

4. Initiate permanent vegetative stabilization measures.

5. Remove accumulated sediment and maintain sediment devices until site has been stabilized.

6. Remove sediment devices once site has been stabilized and given approval by COR.

Date

February 2018 Project Name

Repair Storm Drainage Hunley Park Scale

NTS

Applicant

Joint Base Charleston, Charleston AFB North Charleston, SC

Project Location

Joint Base Charleston - Hunley Park North Charleston, SC 29404

Map Reference

Google Earth 2017

Map Prepared By

Atriax Group 102 3rd Ave NE Hickory NC 28601

(828) 315-9962

Project Site

Hydrologic Soil Group—Charleston County Area, South Carolina (Hunley Park)

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

11/29/2017

586250 586290 586330 586370 586410 586450 586490 586530 586570 586610 586650

586250 586290 586330 586370 586410 586450 586490 586530 586570 586610 586650

32° 53' 55'' N

' 4 0'

' W 32° 53' 55'' N

' 2 4'

' W

32° 53' 46'' N

' 4 0'

' W

32° 53' 46'' N

' 2 4'

' W

N

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84 0 50 100 200 300

Feet 0 25 50 100 150

Meters Map Scale: 1:1,920 if printed on A landscape (11" x 8.5") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION

Area of Interest (AOI) Area of Interest (AOI)

Soils Soil Rating Polygons

A

A/D

B

B/D

C

C/D

D

Not rated or not available

Soil Rating Lines A

A/D

B

B/D

C

C/D

D

Not rated or not available

Soil Rating Points A

A/D

B

B/D

C

C/D

D

Not rated or not available

Water Features Streams and Canals

Transportation Rails

Interstate Highways

US Routes

Major Roads

Local Roads

Background Aerial Photography

The soil surveys that comprise your AOI were mapped at 1:20,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map measurements.

Source of Map: Natural Resources Conservation Service Web Soil Survey URL:

Coordinate System: Web Mercator (EPSG:3857)

Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: Charleston County Area, South Carolina Survey Area Data: Version 14, Oct 11, 2017

Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Feb 9, 2017—Mar 19, 2017

The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Hydrologic Soil Group—Charleston County Area, South Carolina (Hunley Park)

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

11/29/2017

Hydrologic Soil Group

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

Da Dawhoo and rutlege loamy fine sand

A/D 2.6 15.5%

LaB Lakeland sand, 0 to 6 percent slopes

A 9.5 56.6%

Ra Rains sandy loam A/D 2.0 12.1%

UR Urban land-Yauhannah- Yemassee-Ogeechee association

2.7 15.8%

Totals for Area of Interest 16.8 100.0%

Description

Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture.

These soils have a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.

Hydrologic Soil Group—Charleston County Area, South Carolina Hunley Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Rating Options

Aggregation Method: Dominant Condition

Component Percent Cutoff: None Specified

Tie-break Rule: Higher

Hydrologic Soil Group—Charleston County Area, South Carolina Hunley Park

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey