Requirements for Stream Buffers and Stream Impacts

transcript

Requirements for Stream Buffers

and Stream Impacts

Issued May 2009

Level II: Introduction to DesignEducation and Certification for Persons Involved in Land Disturbing Activities

Overview

• What is a State Water?

• Who determines State Waters?

• How to determine State Waters

• Functions of State Water buffers

• What are the rules for State Waters?– GA EPD variance procedures and exemptions

What is a State Water???

• According to the GA E&S Act of 1975, “State Waters” includes any and all rivers, streams, creeks, branches, lakes, reservoirs, ponds, drainage systems, springs, wells, and other bodies of surface or subsurface water, natural or artificial, lying within or forming a part of the boundaries of the State, which are not entirely confined and retained completely upon the property of a single individual, partnership, or corporation.

State Waters

Who determines State Waters?• In areas where there is a certified local

issuing authority (LIA), State Waters determinations are made by the LIA.

• In areas where there is not a certified issuing authority, GA EPD will confirm State Waters and buffer delineations as shown on ES&PC plans.

Field Guide for Determining The Presence of State Waters That

Require a Buffer

• Issued September 2006 by GA EPD

• Available at www.gaepd.org and

www.gaswcc.georgia.gov

Steps for Determining the Presence of State Waters and

Buffer Requirements1. Review the topography of the ES&PC Plan

for natural or artificial features that may indicate the presence of State Waters.

2. Walk the site in order to identify State Waters as defined.

3. Begin the inspection at one end of the potential State Waters and walk the entire length of the State Waters until it exits the property.

Buffer Requirements4. Examine the drainage feature using the field

guide to determine whether the feature is perennial, intermittent, or ephemeral. If the drainage feature is determined to be perennial or intermittent, then a State-mandated buffer exists. If the drainage feature appears to be ephemeral then go to Step 5 to make a final determination.

Buffer Requirements5. If evidence of base flow is present during the

site inspection, the stream is either perennial or intermittent and will require a buffer. If the site is visited during a dry phase and base flows are not evident, the drainage may be ephemeral or intermittent. The ephemeral stream guidance from the field guide should be used to make the final determination as to whether the stream is ephemeral.

Buffer Requirements6. If there is still a question about base flow

after Step 5 is completed, then the “North Carolina Division of Water Quality Stream Identification Method, Version 3.1” (or most current version) should be used to verify whether or not base flow is present.

7. The determination should be documented in writing.

Wrested Vegetation

• Look for a well defined channel and places or patterns of “wrested” vegetation

– vegetation wrested from channel by “normal stream flow” or “wave action”

• Walking the site to determine State Waters is a must!

Wrested Vegetation

Normal Stream Flow Definition

• Intermittent headwater streams with base flow during any period of the year will retain the state mandated buffer protectionBase Flow: the discharge that enters a

stream channel mainly from groundwater through the soil. Base flow also includes spring flow into stream.

• ES&PC design professionals determine existence of base flow, based upon site topography, soils, and vegetation

Normal Stream Flow Definition

• “Normal Stream Flow,” for non-trout waters only, means any stream flow that consists solely of base flow or both base flow and direct runoff during any period to the year.

• “Stream Bank” definition, Rule 391-3-7.01(w). • Applies to State Waters not classified as trout

waters.• Waives stream buffer requirements for true

storm water drainage features, with no base flow component.

Considerations• Ephemeral trout streams are not exempt from the State-

mandated buffer requirements.

• Trout (cold water) streams are delineated in the Georgia Water Quality Control Rules (391-3-6-.03).

• Buffer requirements are in the NPDES State General Permits for Construction Activities.

• DNR Coastal Resources Division should be contacted for marsh delineations.

• State Waters may also be Waters of the U.S.

Other “Clues” for State Waters

• Soils- Hydric soils

• Topography- Drainage Area

• Substrate in Channel- Sandy substrate

• Vegetation types- “Water-loving” species

Wrested Vegetation

Channel

Defined Channel

Wrested Vegetation

Misconceptions in State Waters Determinations

• These factors are not to be considered:– Whether a stream appears on a topographical

map as a solid or dashed blue line– Whether the stream originates on the property– Whether a stream that originates on the

property flows into another stream before it leaves the property

– The duration of water flow in the stream

Misconceptions in State Waters Determinations

• These factors are not to be considered:– The absence of observable aquatic life– Whether or not you “Get your boots wet”

Functions of Buffers

• Reduces storm runoff velocities

• Acts as a screen for “visual pollution”

• Reduces construction noise

• Improves aesthetics on the disturbed land

• Filters and increases infiltration of runoff

• Cools rivers and streams by providing shade

Functions of Buffers

• Provides food and cover for wildlife and aquatic organisms

• Aids in flood protection

• Protects channel banks from scour and erosion

What happens if it is State Waters?

Review of Stream Buffer Rules

• Measured horizontally from point where vegetation has been wrestedwrested by normal stream flow or wave action

• 25 Feet25 Feet - Warm Water streams*

• 50 Feet50 Feet - Trout (cold) streams*

*Local issuing authorities may

require additional buffers in

local ordinance!

• Primary Trout Waters – streams supporting a self-sustaining population of rainbow, brown, or brook trout as indicated in the Rules and Regulations for Water Quality Control, Chapter 391-3-6.

• Secondary Trout Waters- streams with no evidence of natural trout reproduction but capable of supporting trout throughout the year as indicated in the Rules and Regulations for Water Quality Control, Chapter 391-3-6.

• All streams or portions of streams within the Watershed as designated by GA EPD under the provisions of the Georgia Water Control Act (O.C.G.A 12-5-20)

NPDES Permits under Definitions

Trout Stream

Coastal Areas

• Buffers for saltwater marshes and tidally influenced streams are measured from the marsh jurisdictional line, which is determined by the Coastal Resources Division of the GA DNR, pursuant to the Coastal Marshland Protection Act.

What if it is necessary to work in the buffer?

• The minimum 25’ or 50’ (Trout Streams) undisturbed State Waters buffer shall be maintained, except where the Director of GA EPD determines to allow a variance that is at least as protective of natural resources and the environment.

• Variances for the State minimum buffer may only be issued by GA EPD, not by local issuing authorities.

• Check with Federal regulators to ensure compliance with Federal regulations (U.S. Army Corps of Engineers)

Activities exempt from stream buffer variance

requirements:Drainage structures on warm water

streams onlyRoadway drainage structures on warm

water and trout streams. Water line, sewer line crossings (within

25 degrees or perpendicular to the stream)

Drainage Structures

• A device composed of a virtually nonerodible material such as concrete, steel, plastic or other such material that conveys water from one place to another by intercepting the flow and carrying it to a release point for storm water management, drainage control, or flood control purposes.

O.C.G.A 12-7-3 (7)

Roadway Drainage Structures

• A device such as a bridge, culvert, or ditch, composed of a virtually nonerodible material such as concrete, steel, plastic, or other such material that conveys water under a roadway by intercepting the flow on one side of a traveled roadway consisting of one or more defined lanes, with or without shoulder areas, and carrying water to a release point on the other side.

O.C.G.A 12-7-3 (13)

General Variance for Trout Streams

• Average annual flow less than 25 gpm.

• Two methods for determination:

(1) USGS unit area runoff map to determine watershed acreage

(Open-File Report 82-557).

(2) Hydrologic analysis by a registered engineer or geologist.

General Variance for Trout Streams

• Total length on property cannot exceed 200 feet.

• Downstream end of the pipe must terminate 25 feet before the property boundary.

• Information must be provided to the LIA or GA EPD, as appropriate.

Buffer variances will only be

considered for the following ten criteria (a – j)

Buffer Variances

• The project involves the construction or repair of a structure which, by its nature, must be located within the buffer:

• dams • public water supply intake structures • waste water discharges • docks and boat launches • stabilization areas of public access to water

Buffer Variance Criteria – (a)

• The project will result in the restoration or enhancement to improve water quality and/or aquatic habitat quality.

Buffer Variance Criteria – (b)

Buffer Variance Criteria – (c)

• Buffer intrusion is necessary to provide reasonable access to a property or properties.

• The intrusion is for gravity-flow sewer lines that cannot reasonably be placed outside the buffer, and stream crossing and vegetative disturbance are minimized.

Buffer Variance Criteria – (d)

• Crossing for utility lines, including but not limited to: • gas • liquid • power • telephone or other pipelines

(provided that the number of crossings and the amount of vegetative disturbances are minimized)

Buffer Variance Criteria – (e)

• Recreational foot trails and viewing areas, providing that impacts to the buffer are minimal.

Buffer Variance Criteria – (f)

Buffer Variance Criteria – (g)

The project involves construction of:

• one single family home for residential use by the owner of the property and there is no opportunity to develop under any reasonable design configuration.

Project will • require a permit from the U.S. Army Corps of

Engineers (COE) for impacts to jurisdictional waters of the U.S.

• the COE has approved a mitigation plan • implementation of the plan is a 404 permit

condition

- Applicable to non-trout waters only -

Buffer Variance Criteria – (h)

Project includes a plan that shows that the

completed project will maintain or improve water

quality downstream of the project. This criteria

requires a water quality model acceptable to

GA EPD.

Buffer Variance Criteria - (i)

Project with a buffer disturbance located: • in, or upstream and within 10 linear miles of an

impaired stream segment as shown on the Georgia’s Section 303(d) list, and

• includes a plan that shows that the completed project will maintain or improve water quality in the listed segment. This criteria requires a water quality model acceptable to GA EPD.

Buffer Variance Criteria - (j)

Variance Application Review

• Applications are reviewed for completeness within 10 calendar days of receipt.

• Complete applications are reviewed within 60 calendar days of receipt.

• During this timeframe, review comments are forwarded to the applicant or GA EPD issues a 30-day public advisory and advises the applicant to publish a 30-day public advisory.

Application Processing Delays

• Not addressing all of the checklist items which results in an incomplete plan

• Delayed response to GA EPD comments during the 60-day review period

• Not submitting the original tear sheet or affidavit for the applicant’s public notice

New Guidance

• Mitigation guidelines for buffer variance criteria (h), (i) and (j).

• Guidelines for stream bank and shore line stabilization projects.

• New guidelines are currently available on the GA EPD website, www.gaepd.org.

Stream buffer variance and LDA Permits

• The LIA may not issue a land disturbing permit for a project proposing to encroach into the State stream buffer until a GA EPD variance has been granted– Do not assume that since the stream buffer variance

has been submitted that it will be approved

• If a variance is approved, it is the local issuing authority’s responsibility to inspect and enforce for compliance

• If the stream buffer variance is not acceptable to the LIA, the LIA may issue an LDA without allowing encroachment into the buffer

Summary

• Buffers on state waters are valuable in protecting and conserving land and water resources.

• Walk sites and gather all necessary information to determine State Waters

• Some activities are exempt from stream buffer requirements– i.e. drainage structures, sewer crossings, etc.

• All non-exempt activities within a state water buffer require a GA EPD stream buffer variance

For More Information…• Stream buffer variance application and checklist of required

information can be found at www.gaepd.org click on Documents Publications and Forms Watershed Protection Branch Erosion and Sedimentation

• Recommend consulting design professional for assistance with the variance process

• Contact Peggy Chambers, Michael Berry or Jean Shepherd at (404) 675-6240 with stream buffer questions

• DNR Coastal Resources Division at (912) 264-7218

QUESTIONS?