Palmetto Bluff - Moreland Block L Final Development Plan - Application and SWMS Maintenance Manual

TOWN OF BLUFFTON DEVELOPMENT PLAN APPLICATION

Town of Bluffton Development Plan Application Effective Date: 11/10/2011

Growth Management Customer Service Center 20 Bridge Street

Bluffton, SC 29910 43)706-4522

www.townofbluffton.sc.gov [email protected]

(8

Applicant Property Owner

Name: Name:

Phone: Phone:

Mailing Address: Mailing Address:

E-mail: E-mail:

Town Business License # (if applicable):

Project Information

Project Name: Preliminary Final

Project Location: New Amendment

Zoning District: Acreage:

Tax Map Number(s):

Project Description:

Minimum Requirements for Submittal 1. Two (2) full sized copies and digital files of the Preliminary or Final Development Plans. 2. Recorded deed and plat showing proof of property ownership. 3. Project Narrative describing reason for application and compliance with the criteria in Article 3 of the UDO. 4. An Application Review Fee as determined by the Town of Bluffton Master Fee Schedule. Checks made payable

to the Town of Bluffton.

Note: A Pre-Application Meeting is required prior to Application submittal.

Disclaimer: The Town of Bluffton assumes no legal or financial liability to the applicant or any third party whatsoever by approving the plans associated with this permit.

I hereby acknowledge by my signature below that the foregoing application is complete and accurate and that I am the owner of the subject property. As applicable, I authorize the subject property to be posted and inspected.

Property Owner Signature: Date:

Applicant Signature: Date:

For Office Use

Application Number: Date Received:

Received By: Date Approved:

jrsText BoxMichael Hughes, PE

jrsText Box912-721-4191

jrsText Box50 Park of CommerceSavannah, GA 31405

jrsText [email protected]

jrsText BoxMay River Forrest, LLC (Attn: Dallas Wood)

jrsText Box843-706-6446

jrsText Box550 Old Palmetto Bluff RoadBluffton, SC 29910

jrsText [email protected]

jrsText BoxPalmetto Bluff - Moreland Block L

jrsText BoxEnd of Old Moreland Road

jrsText BoxX

jrsText Box59.5 Acres (Project)

jrsText BoxR610 052 000 0059 0000

jrsText BoxX

jrsText BoxX

jrsText BoxX

jrsText BoxX

jrsText BoxPlanned Unit Development

jrsText BoxThe project consist of of general clearing, grading, paving, storm drainage, water, and sanitary sewer infrastructure. The project consists of infrastructure to serve 90 residential lots and 30 multifamily units.

jrsText BoxX

TOWN OF BLUFFTON DEVELOPMENT PLAN APPLICATION

PROCESS NARRATIVE

Town of Bluffton Development Plan Application Effective Date: 11/10/2011

The following Process Narrative is intended to provide Applicants with an understanding of the respective application process, procedures and Unified Development Ordinance (UDO) requirements for obtaining application approval in the Town of Bluffton. While intended to explain the process, it is not intended to repeal, eliminate or otherwise limit any requirements, regulations or provisions of the Town of Blufftons Unified Development Ordinance. Compliance with these procedures will minimize delays and assure expeditious application review. Step 1. Pre-Application Meeting Applicant & Staff

Prior to the filing of a Preliminary Development Plan Application, the Applicant is required to consult with the UDO Administrator or their designee at a Pre-Application Meeting for comments and advice on the appropriate application process and the required procedures, specifications, and applicable standards required by the UDO.

Step 2. Application Check-In Meeting - Preliminary Development Plan Submission

Applicant & Staff

Upon receiving input from Staff at the Pre-Application Meeting, the Applicant shall submit the Preliminary Development Plan Application and required submittal materials during a mandatory Application Check-In Meeting where the UDO Administrator or designee will review the submission for completeness.

Step 3. Review by UDO Administrator & Development Review Committee

Staff

If the UDO Administrator determines that the Preliminary Development Plan Application is complete, it shall be forwarded to the Development Review Committee (DRC). The DRC shall review the application and prepare written comments for review with the Applicant.

Step 4. Development Review Committee Meeting - Preliminary Development Plan Review

Applicant & Staff

A public meeting shall be held with the Applicant to the review the DRC Staff Report and discuss the application. The Applicant will be directed to address any comments, if any, and resubmit the application materials. If applicable, upon resubmittal, the application materials will be reviewed for compliance with the DRC Staff Report and, if all comments are addressed, the application is placed on the next available Planning Commission agenda.

Step 5. Planning Commission Meeting - Preliminary Development Plan Review

Applicant, Staff & Planning Commission

The Planning Commission shall review the Preliminary Development Plan Application for compliance with the criteria and provisions in the UDO. The Planning Commission may approve, approve with conditions, or deny the application. Preliminary Development Plan Application approval shall authorize the Applicant to prepare a Final Development Plan Application for administrative review and approval.

Step 6. Application Check-In Meeting - Final Development Plan Submission

Applicant & Staff

The Applicant shall submit the completed Final Development Plan Application and required submittal materials during a mandatory Application Check-In Meeting where the UDO Administrator or designee will review the submission for completeness.

Step 7. Review by UDO Administrator & Development Review Committee

Staff

If the UDO Administrator determines that the Final Development Plan application is complete, it shall be forwarded to the DRC. The DRC shall review the application and prepare written comments for review with the Applicant.

Step 8. Development Review Committee Meeting Final Development Plan Review

Applicant & Staff

A public meeting shall be held with the Applicant to the review the DRC Staff Report and discuss the application. The Applicant will be directed to address any comments, if any, and resubmit the application materials.

Step 9. Issue Final Development Permit Staff

If applicable, upon resubmittal, the application materials will be reviewed for compliance with the DRC Staff Report, Preliminary Development Plan approval and, if all comments are addressed, the UDO Administrator shall issue the Final Development Permit.

I:\PalmettoBluff-Crescent\Phase2\17000.9005\Permit - Block L\Town\Phase 2 Remaining Density Summary.xlsx

Palmetto Bluff- Block L Job: J-17000.9005May River Forest LLC Date: 7/2/14Thomas & Hutton Engineering Co. Revised:Phase 2 Dwelling Unit Summary By: BTR

Phase # of Lots Phase 2 Initial Master Plan - Approved DU's

Plat 11 2 12Plat 12 2 51Plat 13 2 56

Plat 13C 2 5Plat 13B 2 12

Block K-1 2 4Block K-2 2 47

Proposed Block K-3 2 17Proposed Block L 2 90

Plat Name

Total Remaining- Phase 2 IMP

-12-51-56-5

-12-4

-47-17-90

Assignment of Rights (DU's)1982

1688

STORM WATER MANAGEMENT SYSTEM

MAINTENANCE MANUAL

FOR:

PALMETTO BLUFF

PREPARED FOR:

MAY RIVER FOREST, LLC

J-14845.1001

DATE: MAY 2014

Prepared by:

STORMWATER MANAGEMENT MAINTENANCE MANUAL J 17000 PALMETTO BLUFF P A G E | I

TABLE OF CONTENTS

PAGE

Section I - Introduction 1

Section II - Importance 1

A. Storm Water Conveyance

B. Peak Water Quantity Control

C. Water Quality Control

Section III - Stormwater BMPs 3

A. Ditches and Swales

B. Pipes

C. Inlets and Storm Manholes

D. Outfall Structures

E. Storm Water Detention Ponds

F. Pervious Pavers

G. Vegetative Buffers

H. Stormceptor

Section IV - Inspection and Maintenance 4


B. Drainage Pipes and Culverts



E. Stormwater Detention Ponds

F. Embankments


H. Stormceptor

I. Water Quality Monitoring

Section V Wetland Inspection and Maintenance 9

Section VI Non-structural Best Management Practices 9

Appendix A Contractor List

Appendix B Inspection Summary Table

Appendix C Inspection Logs

STORMWATER MANAGEMENT MAINTENANCE MANUAL J 17000 PALMETTO BLUFF P A G E | II

Appendix D Sample USACOE Notification Letter

Glossary of Terms

Exhibit 1 Major Outfalls

STORMWATER MANAGEMENT MAINTENANCE MANUAL J 14845.1000 PALMETTO BLUFF P A G E | 1

I. INTRODUCTION

Palmetto Bluff is a 3,000 lot planned unit development situated in the

heart of the low country. The 20,000 acre property is bounded on all sides

by tidal estuaries, most notably the May River, one of the last remaining

outstanding water recourses for shellfish harvesting in South Carolina.

Protection of these receiving waters is paramount in preserving the local

way of life. Approximately 38 storm water detention ponds, over 27 miles

of storm pipe, miles of swales and structural and non-structural best

management practices (BMPs) have been installed to control flooding as

well as stormwater quality and peak quantity that is leaving the property.

Inspection and maintenance of these BMPs shall help reduce the possible

degradation of receiving waters.

This Palmetto Bluff Storm Water Management System Maintenance

Manual, is written as a guide for inspection and maintenance of BMPs

typically found within Palmetto Bluff as well as wetlands found within the

community. The procedures herein are provided as a general guide and

no obligation of warranty is implied nor is a timetable for implementation

of repair methods specified. The following sections will outline the

importance of storm water systems, how these systems operate, and

general inspection and maintenance recommendations.

This manual is not intended to act as a BMP guide for construction

activities. The South Carolina Department of Health and Environmental

Control (SCDHEC) and Town of Bluffton approved Site Development Plans

and Stormwater Pollution Prevention Plan shall be referenced for all active

and inactive projects with an open SCDHEC Stormwater Permit and Town

of Bluffton Development Permit.

A storm water management system includes structural and non-structural

features in a community which aid in the conveyance, storage and

treatment of rainwater and surface water which precipitate on or pass

through a community. These storm water features are often referred to as

BMPs. Structural BMPs are physical features specifically placed in a

community to control storm water such as pipes, inlets, manmade ponds

commonly referred to as storm water detention ponds, gutters, swales

and even vegetated plantings such as littoral shelves, sod and seeding.

Non-structural BMPs are components of a storm water management plan


which are not physical additions to the community. Non-structural BMPs

may include, effective land planning, open space preservation, water

quality testing, education programs and even this operation and

maintenance manual.

II. IMPORTANCE

The Federal Water Pollution Control Amendments of 1972 were passed by

the federal government as a measure to limit the impacts to the water

systems of the United States. In developing Palmetto Bluff, a storm water

management system was designed to meet these laws and subsequent

federal state and county requirements. The following paragraphs

summarize the function of a storm water management system.

A. Storm Water Conveyance

The primary function of storm water systems is to convey storm

water runoff away from buildings and roadways. Flood avoidance

of occupied buildings and vehicular accesses and egresses is a

benefit of the storm water system. Pipes, inlets, ditches, swales and

storm water detention ponds are designed for the 25 year, 24 hour

(8 inches of rainfall over 24 hours) storm event. Buildings and home

finished floor elevations are set above the 100 year, 24 hour (10

inches of rainfall over 24 hours) storm event.

B. Peak Water Quantity

The storm water system is also designed to reduce peak storm water

runoff rates exiting the site to pre-development levels. Developed

sites typically reduce the amount of storm water infiltrating into the

ground by increasing the amount of impervious surfaces (roads,

sidewalks, roofs). To protect properties downstream from flooding,

BMPs are installed to reduce the peak runoff rates. Most BMPs

accomplish this by collecting and storing the runoff and releasing

the water at a slower rate. Other BMPs reduce runoff by collecting

runoff and infiltrating the storm water into the ground

C. Water Quality

Palmetto Bluffs storm water management system has been

designed with BMPs to remove pollutants from storm water prior to


exiting. The following are common pollutants found in storm water

runoff and the typical source of the pollutants.

Sediment

Sediment is the introduction of dirt and soils into the water system.

Sediment typically occurs when bare soils are exposed to the

elements and is carried into water systems by storm water runoff

and occasionally wind.

Sediment that stays suspended in the water can be harmful to the

respiratory systems of aquatic animals. As sediment settles to the

bottom of waterways, plant life and stationary organisms living on

the bottom may become buried, and system components may

become blocked. In addition, if sediment reduces the amount of

sunlight that penetrates the water, aquatic plant growth may be

inhibited.

Vegetative Nutrients

Nitrogen and phosphorus are nutrient building blocks for plant life.

High concentrations of these and other nutrients can accelerate

the growth of grasses and shrubs but can also increase the growth

of algae and bacteria in our water systems. The overgrowth of

algae and bacteria can disrupt the fragile balance of aquatic

habitats. These organisms compete with aquatic life for sunlight

and oxygen and can cause the native life to die. These nutrients

are commonly introduced into water bodies by lawn/agricultural

fertilizers as well as decomposed plant material.

Pathogens

Pathogenic organisms, or disease causing organisms, are found in

most natural water systems. High levels of these organisms in storm

water runoff may create health risks to human and animals. This

hazard extends to fish and shellfish, which may ultimately be

consumed by humans. Fecal Coliform is an identifiable bacteria

which indicates the potential presence of harmful organisms such

as E. coli and Salmonella. These diseases are widely common in

nature, but higher concentrations can usually be attributed to fecal

matter from wildlife, domesticated animals and humans.


Other Pollutants and Adverse Water Characteristics

Sediment, Nutrients and Pathogens are typically the pollutants of

highest concern in water systems. Additional pollutants and water

components which have an adverse impact on water bodies are

trash debris, oils, metals, pH and temperature. Often these concerns

are addressed by virtue of the BMPs during the treatment of

sediments, nutrients, and pathogens.

III. STORMWATER BMP STRUCTURES

The following are storm water structures found within Palmetto Bluff

requiring regular inspection and maintenance to perform as intended.


Swales and ditches are used to convey storm water along the

ground surface in vegetated areas. Swales are less defined shallow

ditches. Ditches typically have a higher conveyance capacity and

therefore may require a durable, protective surface. This can be in

the form of vegetation, rip-rap or a synthetic liner.


Drainage pipes are one of the most common methods for

conveying storm water. Storm pipes are typically made of

concrete but are also made of steel or high density polyethylene

plastic. Pipes and culverts are not subject to erosion from the storm

water due to their material strength. Pipes and culverts may be

inundated with water when connected to storm water detention

ponds, or similar water features.

C. Storm Inlets and Manholes

Storm Inlets are structures used to collect water from the surface

and provide transfer to a drainage pipe system. Grate inlet tops

can also act as a filter to strain large debris before entering the pipe

system. Storm manholes are typically used as a junction to change

direction or slope of a pipe conveyance system. The bottom of a

storm inlet structure and manhole are a foot deeper than the pipes


entering and exiting the structure. This allows heavy particulate

such as stone or gravel to settle at the bottom of the structure

without washing into the pipe system. Manholes and storm inlets

also contain a top which can be removed to enter the structure for

maintenance and inspection. OSHA CFR 29 Standard 1910-146

(www.osha.gov/comp-links.html) should be followed when entering

any confined space.

D. Outlet Control Structures

Typically there are two types of outlet control structures, concrete

box structures and open channel spillways. Outlet control box

structures have a series of openings which regulate the rate of

runoff exiting a storm water detention pond during a storm event.

The structure can either be located in a storm water detention

pond with a pipe at the point of discharge, or a pipe from the storm

water detention pond to the structure located at the discharge

point (commonly referred to as a bubbler) or a pipe from the storm

water detention pond extends to structure hidden in a vault

underground with another pipe extending to the outfall point.

(commonly referred to as a box-in-a-box).

An open channel spillway is a notch in a storm water detention

pond berm which allows storm water to exit the storm water

detention pond at a controlled location. Depending on their

design velocity and anticipated frequency of use, spillways are

lined with grass, rip-rap, erosion control reinforcement matting, or

concrete.

E. Storm Water Detention/Retention Ponds

Ponds are the most recognizable component of a storm water

system. In addition to aesthetic appeal, storm water detention

ponds and components serve as an effective means to control

storm water runoff rates and storm water quality discharging from

the property.

During a rain event, storm water runoff is collected and conveyed

to ponds through pipes, channels, swales, curb gutters and roof

gutters. For most storm events, the storm water exits the storm


water detention pond through an outlet control structure slower

than the water entering. Therefore, the elevation of the storm water

detention pond rises and the peak flow rate exiting the pond can

be reduced to less than the predevelopment flow rates. Due to the

size of the watershed relative to the conveyance structure, the

velocity of the storm water traveling through the storm water

detention pond slows, allowing sediment and heavy metals to settle

to the bottom of the pond.

The water in the storm water detention pond is also exposed to

sunlight. Ultraviolet rays kill fecal coliform and harmful pathogens.

Plantings within the storm water detention pond, particularly those

of the littoral shelf, absorb nitrogen and phosphorus nutrients. The

littoral shelf vegetation also tends to trap floating trash and debris.

F. Pervious Parking

Pervious aggregate is used in select parking stalls to reduce the

overall impervious area of the facility. Promoting infiltration by

introducing stormwater into the ground reduces the overall volume

of runoff and pollutants typically caused by typical impervious

parking. Stormwater enters and is stored in the underlying voids in

the gravel until the stormwater can infiltrate into the subgrade soils.

G. Vegetative Buffers.

Vegetative buffers along natural freshwater and saltwater bodies

are in place to remove pollutants from stormwater by stabilizing

soils, reducing stormwater velocity, and nutrient uptake. A

minimum eighty foot (80) River Protection Overlay District (RPOD)

buffer is maintained around the perimeter Ocean Coastal

Resources Management (OCRM) Critical Line. An average thirty-

five foot (35) natural buffer is maintained along preserved

freshwater wetlands.

H. Stormceptors

Stormceptor structures are used to meet stormwater quality for sites

that required to discharge directly into sensitive waters or buffers to

reduce the Total Suspended Solids (TSS) released into these areas.

These structures are designed by the manufacture to handle the


most frequent rain events and remove a specified percentage of

TSS from the stormwater runoff based on the finest soil particles

existing on site. Each structure is site specific for the size of the site

and soils on site.

IV. INSPECTION AND MAINTENANCE RECOMMENDATIONS

The following are recommended maintenance and inspection

procedures for storm structures.


Routine Maintenance Activities Typically Associated with Ditches and Swales

Activity Schedule

Water to promote plant growth and survival.

Inspect swales following rainfall events. Plant

replacement vegetation in any eroded areas.

As Needed (Following Construction)

Inspect to ensure that contributing drainage area and

swale are clear of sediment, trash and debris. Remove

any accumulated sediment and debris.

Ensure that the contributing drainage area is

stabilized. Plant replacement vegetation as needed.

Check to ensure that dry swales are properly

dewatering after storm events.

Monthly

If applicable, inspect pretreatment devices for

sediment accumulation. Remove accumulated

sediment, trash and debris.

Inspect swale for sediment accumulation. Remove

sediment when it accounts for 25% or more of the

original channel cross-section.

Inspect swale and side slopes for erosion and the

formation of rills and gullies. Plant replacement

vegetation in any eroded areas.

Inspect swale for dead or dying vegetation. Plant

replacement vegetation as needed.

Inspect swales for overgrown vegetation that may

restrict stormwater conveyance and manicure as

needed.

Annually (Semi-Annually During First Year)

If a dry swale filter bed is clogged or partially clogged,

manual manipulation of the bed may be required.

Remove the top 2 to 3 inches of the filter bed and till

or otherwise cultivate the top of the bed. Replace the

filter media with an appropriate engineered soil mix.

As Needed


Routine Maintenance Activities Typically Associated with Pipes and Culverts

Activity Schedule


Upstream erosion control measures within the contributing

drainage area of the pipes or culverts shall be inspected

and maintained until disturbed areas meet stabilization

requirements.

As Needed

(Following Construction)

Road culverts should be visually inspected yearly

for sediment build-up within the pipe.

Pipes should be examined for defects such as

cracks, deformation or joint separation.

Inspect pipe junctions and pipe discharge points

for sediment build-up.

Inspections should be performed during dry

weather when storm water should have fewer

suspended particles and pipe ends can be more

easily observed.

Annually

(Semi-Annually During First Year)

Visually inspected after large storm events to verify no

obstructions inhibit flow through the pipe.

If more than 1/3 the height of the pipe or culvert is

sediment laden, the culvert should be cleaned.

As Needed

(After large storm events)

Maintenance Notes:

Culverts

Smaller culverts typically use a jet-vac (combination water pressure

washing and vacuum machine) to blast sediment from the pipe.

The sediment is vacuumed into a tank truck. If the culvert is partially

or completely submerged, typically a cofferdam is build on either

side of the pipe and the culvert is pump dry for cleaning. Prior to

constructing a cofferdam, confirm the upstream and downstream

areas are not wetlands or water of the state.

Drainage Pipes

If pipes are submerged, If sediment is observed, pipe can be

cleaned manually or with a jet-vac. If pipes are submerged,

typically a pneumatic pillow plug or multi-flex plug is inflated on

either side of the sediment laden area and the water is pumped to

another location. If a jet-vac system is used to clean the pipe, the

system should be checked by video camera as well to inspect for

pipe deficiencies such as cracks, deformation or joint separation if

necessary.



Routine Maintenance Activities Typically Associated with Inlets and Storm Manholes

Activity Schedule


drainage area of inlets shall be inspected and maintained

until disturbed areas meet stabilization requirements.

As Needed

(Following Construction)

Ensure that the contributing drainage area is

stabilized. Plant replacement vegetation as needed.

Monthly

Within the golf maintenance area, sand oil separators

should be inspected quarterly. Floating oils and

accumulated sediment should be removed with a

vacuum truck and disposed of properly.

Quarterly

Flashlight inspection should be performed on all

drainage structures for sediment build-up.

If the structures sump is filled with sediment or debris, material should be removed. (This may

be performed manually with a shovel and

bucket or vac truck.)

Structures should be inspected for cracks or

missing grout around pipes and at structure

joints.


Inspect grate top storm inlets to check for obstructions

which may limit flow during future storm events.

As Needed



Routine Maintenance Activities Typically Associated with Outfall Structures Activity Schedule


drainage area of inlets shall be inspected and maintained

until disturbed areas meet stabilization requirements.


Flow control openings should be examined for debris

which might affect the structures ability to properly regulate storm water flow.

Remove any accumulated sediment and debris from

inlet and outlet structures.

Monthly

Concrete box structures should be inspected for

sediment build-up and integrity similar to the

inspection and maintenance of inlets and storm

manholes.

Open channel spillway controls and areas

immediately downstream of outlet control boxes

should be inspected and maintained in the

same manner as ditches and swales.


Visually inspected after large storm events to verify no

obstructions inhibit flow through the outfall.

As Needed



E. Stormwater Detention Ponds

Routine Maintenance Activities Typically Associated with Stormwater Ponds

Activity Schedule

Water side slopes and buffers to promote plant growth

and survival.

Inspect side slopes and buffers following rainfall events.

Plant replacement vegetation in any eroded areas.


Remove any accumulated sediment and debris from

inlet and outlet structures.

Monthly and after

storm events

Inspect side slopes and buffers for erosion. Plant

replacement vegetation in any eroded areas.

Inspect side slopes and buffers for dead or dying

vegetation. Plant replacement vegetation as needed.

Inspect side slopes and buffers for invasive vegetation

and remove as needed.

Inspect the littoral shelf of perimeter vegetation.

Floating debris, trash or debris trapped should be removed and disposed of properly.

If applicable, monitor wetland vegetation and

perform replacement planting as necessary.

Remove and replace dead, decayed vegetation

Manicure overgrown vegetation

Annually

(Semi-Annually During First Year)

Inspect for damage, paying particular attention to the

control structure and side slopes. Repair as necessary.

Inspect side slopes for erosion and undercutting and

repair as needed.

Check for signs of eutrophic conditions (e.g.,

excessive algal growth).

Check for signs of hydrocarbon accumulation and

remove appropriately.

Examine to ensure that inlet and outlet devices are

free of sediment and debris and are operational.

Check all control gates, valves and other mechanical

devices of stormwater irrigation system.

Inspect the pond for sediment accumulations,

including areas immediately adjacent to pipe ends

entering and exiting the storm water detention pond.

Isolated vegetative growth is a possible indicator of

isolated sediment accumulation.

Vegetation within the littoral shelf and along the

perimeter of the pond shall be inspected and culled as

necessary to remove excess plant matter and allow

room for new growth. To be effective, trimmings should

be collected, removed and not allowed to fall into the

storm water system.

Annually

Monitor Sediment Accumulation and Remove if

capacity is lost.

5 years


Stormwater Pond Maintenance Notes:

At five year intervals or if accumulated sediment/wetland

vegetation in the body of the stormwater pond is observed, a

survey should be performed to monitor the depth of the storm water

detention ponds. Inspections can be performed using a measuring

rod, measuring tape with a weight, a depth finder or a bathymetric

survey. Cross sections should be taken at regular length intervals.

The location of the ponds water edge should also be recorded.

Long term settlement of sediment on the ponds littoral shelf and

bank can cause the water edge to creep inward, and may reduce

the ponds detention and water quality capacity. The five year

inspection interval shall commence from the year a development

permit was obtained from the County/Town.

Two common methods exist for sediment removal; dredging, and

water drawdown and excavation. Storm water detention pond

dredging usually consists of a barge suctioning water and sediment

from the bottom of the storm water detention pond and

discharging the material into a temporary sediment pond. The

material is allowed to settle in the temporary sediment pond, and

when dry, is removed from the site. The challenge of dredging is

establishing ingress and egress for the dredging barge, and

creating a temporary sediment pond for the pumped material from

which the collected sediment must still be removed. Typically, this

procedure requires an United States Army Corps. of Engineers

(USACOE) Permit USACOE and South Carolina Department of

Health and Environmental Control Ocean Coastal Resources

Division (DHEC-OCRM) Permit. The advantage of dredging is the

limited impact to existing fish and the chemical balance of the

storm water pond. Conventional drawdown, excavation and

reshaping of a storm water detention pond requires pumping or

draining the storm water detention ponds water to an outfall, or to

another location. Sediment is typically removed using a backhoe.

Excavated materials may need to be placed in a temporary

location or stockpiled in the storm water detention pond bottom to

allow drying of the material prior to hauling to an offsite location.


F. Embankments

Routine Maintenance Activities Typically Associated with Embankments Activity Schedule

Water slopes and buffers to promote plant growth and

survival.


Inspect any exposed earth, scouring or erosion on the

embankment.

Monthly

(after large storm events)

Inspect slopes for erosion. Plant replacement

vegetation in any eroded areas.

Inspect slopes and buffers for dead or dying

vegetation. Plant replacement vegetation as

needed.

Road and storm water detention pond embankments

should be visually inspected twice annually. Inspect for

soft or saturated soils and groundwater seepage from

the embankment during dry times. Embankment

erosion should be reinforced, corrected and sodded or

seeded.

Bi-Annually

Enbankment Maintenance Notes:

If scouring is a persistent problem along the banks and establishing

vegetation cannot withstand the storm water runoff, consult the site

engineer.


Routine Maintenance Activities Typically Associated with Vegetative Buffers Activity Schedule

Noticeable dead or dying vegetation within buffer should

be corrected and re-vegetated with native drought

tolerant plants.

As Needed

Inspect the OCRM Critical Line buffer in developed

areas of the property. Buffer should remain natural,

heavily vegetated and unmanicured unless an

engineered solution has been approved by Palmetto

Bluff and the Town of Bluffton.

Inspect for any exposed earth, scouring or erosion on

the embankment. Buffer erosion should corrected and

re-vegetated with native drought tolerant plants.

Bi-Annually


Vegetative Buffer Maintenance Notes:

If scouring is a persistent problem and vegetation cannot be

established, consult the site engineer.

Adjacent residents to Critical Line buffers and freshwater wetland

buffers should be educated on the purpose of the buffer and the

development restrictions of these areas.

H. Stormceptor Maintenance and Inspections

Per the manufacturer, post construction maintenance should be as

follows:

Units should be inspected post-construction

Inspect every six months for the first year of operation to

determine the oil and sediment accumulation rate.

In subsequent years, inspections can be based on first-year

observations or local requirements.

Cleaning is required once the sediment depth reaches 15% of

storage capacity, (generally taking one year or longer). Local

regulations for maintenance frequency may vary.

Inspect the unit immediately after an oil, fuel or chemical spill.

A licensed waste management company should remove

captured petroleum waste products from any oil, chemical or

fuel spills and dispose responsibly.

In addition to the above requirements, during construction the

contractor shall inspect the unit immediately after every rainfall and

once a month. Cleaning the unit once 15% of storage capacity is

reached per manufacturer recommendations.

I. Water Quality Monitoring

Due to the size and sensitive location of Palmetto Bluff water quality

monitoring at all major outfalls shall be performed twice per year.

Major outfalls are identified on Exhibit 1. This results based method

for testing water quality shall allow Palmetto Bluff to replace the


annual maintenance inspection and reporting outlined in Section

8.4.1.C of the Town of Bluffton Unified Development Code with the

inspection schedule outline herein.

Water Quality Monitoring for new development shall be performed

for 36 months following issuance of the projects Certificate of

Compliance based on the schedule outlined in Section 8.3.4.B of

the Town of Bluffton Unified Development Code. Following the 36

month period, the semi-annual inspection schedule shall

commence.

V. WETLAND INSPECTION AND MAINTENANCE

If existing wetland ditches become clogged with debris and create a

potential flood hazard, maintenance of the ditches within the wetland is

permissible under the Palmetto Bluff Wetland Covenants. Ditches must be

hand cleared. Excavated spoil must be removed and not cast in the

wetland. Removal of trees presenting a hazard to residential dwellings

should be cut such that they fall into the wetland. Felled trees should not

be removed. Wetland maintenance activities should be communicated

to the United States Army Corp of Engineers.

VI. NON-STRUCTURAL BEST MANAGEMENT PRACTICES

Street Sweeping

Community Streets should be swept on an as needed basis to remove

sediments and heavy metal particulate deposited from vehicles.

Collecting contaminants before they enter the drainage system aids in

water quality treatment and reduces maintenance intervals of the storm

water system.

Fertilization

Application rates specified by manufacturers of fertilizers should be strictly

followed.

Car Washing

Personal vehicles should be washed at retail car wash facilities where the

runoff is routed to the sanitary sewer system. If vehicles are washed in the

homeowners driveway, environmentally friendly detergents should be


used. Substantial accumulations of debris and dirt washed off the car

should be disposed of properly.

Pet Waste Control

Community pets waste rules should be strictly enforced to limit

pathogenic pollutants entering the storm water system.

Yard Waste Disposal

All yard waste should be properly disposed of and not allowed to enter

the storm drainage system.

Education

Regular community meetings and education programs should be held to

assist residents in understanding the importance of and maintenance

costs of the communitys storm water management system. Residents

should understand the actions they can take to reduce these

maintenance costs and improve overall environmental quality of the

community and Beaufort and Jasper County water bodies.

STORMWATER MANAGEMENT MAINTENANCE MANUAL J 14845.1000 PALMETTO BLUFF

APPENDIX A - CONTRACTOR LIST

LANDSCAPE CONTRACTORS

The Greenery, Inc

Josh Smith

960 William Hilton Parkway, Hilton Head Island, SC 29928

Phone: (843) 785-3848

Ocean Woods Landscaping

Rick Sotiropoulos

67 Union Cemetery Road, Hilton Head Island, SC 29926

Phone: (843) 682-4000

SITE CONTRACTORS

Cleland Site Prep, Inc.

Avery Cleland

Post Office Box 3822, Bluffton, SC 29910

Phone: (843) 987-0500

Terry R. Lee Contracting

Terry Lee

Post Office Box 1788, Hardeeville, SC 29927

Phone: (843) 784-5288

Palm Beach Grading of South Carolina

Jim Possanza

Post Office Box 1459, Hardeeville, SC 29927

Phone: (843) 784-3031

PIPE CLEANING CONTRACTORS

Southeast Pipe Survey

Timmy Lowman

Post Office Box 477, Patterson, GA 31557

Phone: (912) 647-2847

Degler Waste Services

Ron Degler

Post Office Box 1853, Bluffton, SC 29910

Phone: (843) 645-7867


Appendix B Inspection Summary Table

Inspection Area

Suggested

Inspection

Interval

Inspection

Recommendation Action

On-site Ditches

and Swales

Yearly Visual inspection

for bare earth,

scouring and

erosion

Fill, stabilize & re-

vegetate

Wetland Ditches Every 5 years or

observed

extended

impoundment

Visual inspection

for obstructions

and

sedimentation

Coordinate with

Engineer & notify

USACOE,

Road Culverts Yearly Visually inspect

for sedimentation

and obstructions

Clean manually or

with jet-vac and

properly dispose of

sediment

Grate Inlets and

storm manholes

Yearly Visually inspect

and remove

accumulated

debris and

sediment build-

up

Clean manually or

with vacuum truck

and properly

dispose of

sediment

Storm Pipes Every 15 years Visually inspect

and remove

accumulated

debris and

sediment build-

up

Clean manually or

with vacuum truck

and properly

dispose of

sediment

Sand Oil

Separators

Quarterly Visually inspect

for oils, floating

debris and

sediment

Clean with

vacuum truck.

Outfall Structures

and Stormceptors

Yearly Visually inspect

and remove

accumulated

debris and

sediment build-

up

Clean manually or

with vacuum truck

and properly

dispose of

sediment

Storm Water

Detention Pond

Perimeter

Twice per year Visually inspect

for

sedimentation,

trash, bare earth

Fill, stabilize & re-

vegetate,

excavate

sedimentation if


and scouring function affected;

dispose of debris

Storm Water Pond

Depth

Every 5 years or

observed

accumulation

Measure depth Perform depth

survey; excavate

sedimentation if

function affected

Littoral Shelves Yearly Inspect

vegetation for

overgrowth and

dying plant

matter

Cull vegetation as

needed

Storm Water

Detention Pond

Chemistry

As needed Test pH, Alkalinity,

Fecal Coliform,

Nitrogen,

Phosphorus

Consult Engineer


APPENDIX C INSPECTION LOGS

Date BMP Status Action

STORMWATER MANAGEMENT MAINTENANCE MANUAL J 17000 PALMETTO BLUFF

APPENDIX D SAMPLE USACOE NOTIFICATION LETTER

Date

Charleston District

US Army Corps of Engineers

69A Hagood Avenue

Charleston, SC 29403

Re: Ditch Maintenance

Palmetto Bluff

Bluffton, South Carolina

Dear :

On behalf of , we wanted to notify you that

will be conducting ditch maintenance activities on the silvicultutal

ditches located within Palmetto Bluff located

in Beaufort County, South Carolina.

The ditch maintenance activities will involve using hand crews to remove

the excess silt, rack, vegetation or debris impeding the normal flow through the

ditches on the site. There will be no mechanized equipment used during the

maintenance activities. The maintenance activities will not make any

modifications to the size or shape of the ditches. Pictures of the maintenance

activities will be sent to you for review.

Upon your review of this letter, if you have any questions or require any

additional information, please do not hesitate to contact our office at ( )

.

Sincerely,


GLOSSARY OF TERMS

25-year, 24-hour storm event A rain event which lasts 24 hours and has a 4%

chance of occurring any given year. For Palmetto Bluff, a 25-year, 24-hour storm

event equates to 8-inches of rainfall in a 24 hour period.

100-year, 24-hour Storm Event - A rain event which lasts 24 hours and has a 1%

chance of occurring any given year. For Palmetto Bluff, a 100-year, 24-hour

storm event equates to 10-inches of rainfall in a 24 hour period.

Best Management Practice Any policy, standard, design, device or structure

intended to control stormwater pollution.

Culvert A drainage pipe which crosses a road or embankment

Curb Inlet An underground structure which has an opening in a roads curb

which collects storm water runoff and drains the runoff to an underground pipe

system.

Ditch A defined depression in the ground which conveys storm water.

Erosion The wearing away of soil from the earth by water or wind.

Erosion Control Liner A synthetic or natural material placed on the surface or a

ditch embankment to control the wearing of soil. Erosion control liners are often

used in conjunction with seeding to protect the slope and seeds during

germination.

Grate Inlet An underground structure which has an opening in the top,

covered by a grate which collects storm water runoff and drains the runoff to an

underground pipe system. Grate inlets can be found in grass areas or on paved

areas.

Littoral Shelf A flat, shallow portion of a storm water detention basin along the

lagoon edge where rooted wetland plans grow. Littoral shelf plans can aid in

pollutant removal from water collected in the storm water detention basin.

Non-structural Best Management Practice A policy, standard or practice which

controls stormwater pollution.

Outfall Location of drainage system discharge.


Outlet Control Structure A structure that regulates quantity and/or quality of

storm water released from a drainage system.

Pathogen A disease causing bacteria or fungus.

Peak Flow The highest rate of storm water flow during a storm event.

Rip-rap Stone used to stabilize earth and impede erosion.

Scouring - The process of removing soil from the earth by flowing water.

Sediment - Dirt, soil or organic matter in water which can settle to the bottom of

a water body.

Sedimentation The accumulation of sediment in a water body, or waterway.

Storm Manhole - An underground structure which connects drainage pipes.

Storm Water Pond Typically a man-made body of water constructed to

temporarily store storm water runoff for the purpose of water quality treatment

and/or peak discharge reduction.

Stormceptor Stormwater structure designed to remove particles and pollutants

form stormwater discharge.

Structural Best Management Practice a physical device installed as part of the

storm drainage system to control storm water pollution.

Swale - A subtle depression in the ground which conveys storm water.

Watershed The area of land whose rainfall drains to a single specified location.

1

TOWN OF BLUFFTON

DEVELOPMENT PERMIT

SUBMITTAL

FOR

May River Forest, LLC.

Moreland - Block L TOWN OF BLUFFTON, SOUTH CAROLINA

Palmetto Bluff-Phase 2

THOMAS & HUTTON ENGINEERING CO.

July 2014

2

LIST OF EXHIBITS

PALMETTO BLUFF MORELAND BLOCK L

Title Exhibit

1. Vicinity Map

A

2. Narrative...

B

3. Irrigation Re-Use Calculations and Exhibit.

C

4. Storm Maintenance agreement and Manual.

D

5. Inlet and Pipe Sizing Report

E

6. Tree Tally.

7. Deed and Plat.......

8. Dwelling Unit Summary and Land Use Exhibit..

F

G

H

PALMETTO BLUFF MORELAND BLOCK L PROJECT NARRATIVE

J 17000.9005

July 3, 2014

PUD Consistency

Palmetto Bluff is a plannedunit development subdivision consisting of large

estate residential lots detached and attached singlefamily homes, resort

rental accommodations, commercial / retail development and golf courses with

other recreational amenities. The project site is located in the Town of Bluffton,

SC, and is a portion of the Palmetto Bluff Tract. Development within the project

must conform to the Palmetto Bluff Tract Master Plan, as adopted by the Town of

Bluffton. Plans and documents included in this application are consistent with

the concept PUD, development agreement and Initial Master Plan. PUD Description

Palmetto Bluff is a 20,000 acre tract of undeveloped woodland located in

Southern Beaufort County, South Carolina. The site was annexed into the Town

of Bluffton to facilitate the development of a new, largetract Planned Unit

Development (PUD). The property is bounded by the May River on the north, the

May and Cooper Rivers on the east, and the New River on the south and west.

Project Specific Description

May River Forest, LLC is continuing development of Palmetto Bluff with the

construction of Moreland Block L. The project is approximately 59.5 acre

located along the bank of the Cooper River which will consist of 90 residential

lots and infrastructure proposed. A pump station is also proposed with this

project.

Soil Conditions

The project area involves many soil types including: Murad, Lakeland, Pickney,

Coosaw, Yonges, and Chipley. Indications show that the project area contains

majority loamy fine sand. Slopes range from 0 to 12 percent.

Existing Conditions

The site is presently consists a wooded mixture of hard wood and pine. Efforts

shall be made to limit tree removal.


Page 2 of 4

Wetland Impacts

There will be a wetland impact for the proposed project. The impacts are

permitted under Department of the Army permit # 2004-1G-360 and can be

found on sheets 84 & 85 of 112 on the enclosed cd.

Surface Water Protection Plan

The previously established and delineated preserved wetlands for this

project are primarily located within the central and western areas of the project.

The previously established and delineated OCRM Critical Line for this project is

located around the north, east, and southern perimeter of the site.

For areas adjacent to preserved wetlands within the project, Option B

from 3.2.4.C will exist. A 25-foot undisturbed buffer will be maintained along with

a double row of silt fence constructed to prevent excess sedimentation and

direct runoff from the site. Adequate silt fence will be installed beyond the 25-ft

preserved wetland buffer and maintained for the entirety of this project as

shown on the erosion control plan, sheets: EC2.1-EC4.3. A list of standard notes

and details addressing maintenance can be found on sheets: EC1.1-1.2 & EC5.1-

5.2.

Flood Zone

The majority of the site is located in Zone A6, which is an area determined to be

within the 100year floodplain with base flood elevation of 13. The site can be

found on Flood Insurance Rate Map Number 4500025 0110D. Access & Construction Traffic

Traffic will be routed off of Old Palmetto Bluff Road to Old Moreland Road for the

proposed project. Borrow Material

Borrow material for the overall project development is generated by lagoon

construction. Storm Water Management System

As well as providing aesthetics and recreational components for the planned

development, the proposed lagoons will primarily serve for managing

stormwater runoff by providing water quality and water quantity control.

Consequently, the lagoon is designed to attenuate and safely convey the 2,


Page 3 of 4

10 and 25year rainfall events and safely pass the 100year rainfall event off the

site without impacting upstream or downstream of the project watershed.

Moreland Block L will drain to the existing and proposed lagoon and enter into

the existing series of lagoons, centrally located throughout the Moreland area.

Stormwater quality for the site shall be addressed treatment through vegetative

filtration in roadside swales, littoral shelf vegetative filtration, wet ponds and

infiltration shall be promoted through the use of stormwater reuse in irrigation.

Setbacks

All buildings are required to meet Fire & Building Code requirements prior to

construction. Road Sections

Moreland Block L will consist of multiple road sections throughout the

development. Listed below are the road sections:

Old Moreland Road (North side of Bridge)

Width = 22 feet

Section = Sloped at approx. 2%

Material = Asphalt

Rightofway = Varies

Drainage = One Sided Curbing, Inlets and Pipe

Old Moreland Road (South of Bridge)

Width = 20 feet


Material = Shell/aggregate mixture

Rightofway = Varies

Drainage = Roadside swales, Inlets and Pipe

Backshore Street, Cauley Creek Road, Portage Street, Inkberry Street

Width = 20 feet


Material = Asphalt

Rightofway = Varies

Drainage = Curbing, Inlets and Pipe

Hannah Lane, Landings Cemetery Lane,

Moreland Trail, Alley 7, Corley Street

Width = 20 feet



Rightofway = Varies



Page 4 of 4

Alley 5,

Width = 14 feet



Rightofway = Varies

Drainage = Roadside swales and natural drainage

Alley 1

Width = 12 feet

Section = Inverted Crown Sloped at approx. 2%

Material =Asphalt

Rightofway = Varies

Drainage = Inlets and Pipe

Alley 2, 3, 4, and 6

Width = 12 feet



Rightofway = Varies


Sidewalk/Trail Systems

Trails and sidewalks within Palmetto Bluff will be constructed as part of the

building construction and not site development. Therefore the sidewalks may

not be installed prior to request for final Certificate of Compliance or

Occupancy. Sidewalks and trail systems will be constructed at the earliest

possible time as it relates to completion of infrastructure that may adversely

affect them.

PALMETTO BLUFF MORELAND BLOCK L DATE : 3-Jul-14

BEAUFORT COUNTY REVISED: 3-Jul-14

MAY RIVER FOREST, LLC. BY : MBA

THOMAS & HUTTON ENGINEERING CO. JOB : J-17000.9005L

TREE TALLY

PINE

DIAMETER (INCHES) NUMBER TO BE REMOVED

24 5

25 1

26 1

28 1

29 1

30 1

34 1

38 1

TOTAL CALLIPER INCHES REMOVED = 330

NUMBER OF 4" DBH REPLACEMENT TREES = 83

TOTAL 4" REPLACEMENT TREES 83

I:\PalmettoBluff-Crescent\Phase2\17000.9005\Permit - Block L\Town\Final Dev. Plan Submittal\

17000.9005 TREE TALLY 1 of 1

Permanent Stormwater System Maintenance and Responsibility Agreement

Under the South Carolina Stormwater Management and Sediment Reduction Act of 1991 (48-14-10, et. seq.), Regulation 72-308 requires the Landowner, its successors and assigns, including any homeowners association, shall adequately maintain the stormwater management/Best Management Practices (BMP) facilities. This includes all pipes and channels built to convey stormwater to the facility, as well as all structures, improvements, and vegetation provided to control the quantity and quality of the stormwater. Adequate maintenance is herein defined as good working condition so that these facilities are performing their design functions. The Department of Health and Control (DHEC)/Office of Ocean and Coastal Resource Management (OCRM) recommends that The Landowner, its successors and assigns, shall inspect the stormwater management/BMP facility regularly. The purpose of the inspection is to assure safe and proper functioning of the facilities. The inspection shall cover the entire facilities, berms, outlet structure, pond areas, access roads, etc. The Landowner, its successors and assigns, hereby grant permission to the DHEC/OCRM, its authorized agents and employees, to enter upon the Property and to inspect the stormwater management/BMP facilities whenever DHEC/OCRM deems necessary. The purpose of inspection is to follow-up on reported deficiencies and/or to respond to citizen complaints. DHEC/OCRM shall provide the Landowner, its successors and assigns, copies of the inspection findings and a directive to commence with the repairs if necessary. The Landowner, its successors and assigns, will perform the work necessary to keep these facilities in good working order as appropriate. In the event a maintenance schedule for the stormwater management/BMP facilities (including sediment removal) is outlined on the approved plans, the schedule will be followed. This Agreement imposes no liability of any kind whatsoever on DHEC/OCRM and the Landowner agrees to hold DHEC/OCRM harmless from any liability in the event the stormwater management/BMP facilities fail to operate properly. I accept responsibility for ownership and proper maintenance of the stormwater system (pond, swales, etc.) on the ______________________________________________ site per the approved maintenance plan. I will complete any necessary repairs and/or preventive maintenance procedures in a timely manner to ensure proper functioning as a stormwater management device(s). It is my understanding that the maintenance plan may be amended/revised at any time by DHEC/OCRM, and I will abide by any prescribed changes. I will continue to own and maintain the pond until DHEC/OCRM is notified in writing of a transfer in ownership and maintenance responsibility. The notification will include a date for the transfer of responsibility and a letter of acceptance from the new owner. I understand that failure to adhere to the signed maintenance agreement may result in fines of up to $1,000.00 per day, per violation and /or the institution of a court action. ___________________________ __________________________________ ________________ Signature of Owner/Agent Printed Name of Owner/Agent Date ___________________________ __________________________________ _________________ Mailing Address City/State/Zip Phone Number _______________________________________________ Notary Stamp/Signature/Date

jrsText BoxPalmetto Bluff - Moreland Block L

Phase 2 Remaining Density Summary.pdfPS - Block L

17000.9005.pdf17000_000117000_000217000_000317000_000417000_000517000_000617000_000717000_000817000_000917000_001017000_001117000_001217000_001317000_001417000_001517000_001617000_001717000_001817000_001917000_002017000_002117000_002217000_002317000_002417000_002517000_002617000_002717000_002817000_002917000_003017000_003117000_003217000_003317000_003417000_003517000_003617000_003717000_003817000_003917000_004017000_004117000_004217000_004317000_004417000_004517000_004617000_004717000_004817000_004917000_005017000_005117000_005217000_005317000_005417000_005517000_005617000_005717000_005817000_005917000_006017000_006117000_006217000_006317000_006417000_006517000_006617000_006717000_006817000_006917000_007017000_007117000_007217000_007317000_0074

17000.9005 - pond_maint agreement.pdfNotary Stamp/Signature/Date

2004-1G-360.pdf05.05.06 PERMIT # 2004-1G-360-P-C - FINAL (218 PGS)

Documents

Palmetto Bluff - Moreland Block L Final Development Plan - Application and SWMS Maintenance Manual