|
STANDARD
|
REVISIONS
|
|
VEGETATIVE
|
| MANAGEMENT
OF HIGH ACID PRODUCING SOILS |
NEW.
Addresses soils with a pH of 4 or less or which contain iron
sulfide. The standard addresses requirements for handling these
soils. |
| DUNE
STABILIZATION |
The
list of plant materials which can be used for protecting and
building sand dunes has been expanded. |
| MAINTAINING
VEGETATION |
Insignificant
change. |
| PERMANENT
VEGETATIVE COVER FOR SOIL STABILIZATION |
"Increases
options for stabilization, modifies seeding rates, adds hydroseeding." |
| STABILIZATION
WITH MULCH ONLY |
Deletes
option of using cutback asphalt |
| PERMANENT
STABILIZATION WITH SOD |
Requires
soil test to determine appropriate limestone and fertilizer
applications. |
| TEMPORARY
VEGETATIVE COVER FOR SOIL STABILIZATION |
Requires
soil test to determine appropriate limestone and fertilizer
applications. Modifies approved grass species. |
| TOPSOILING |
Allows
topsoil substitutes. |
| TREE
PROTECTION DURING CONSTRUCTION |
Identifies
certain species not recommended for preservation. |
| "SELECTION
OF TREES, SHRUBS AND VINES FOR PLANTING" |
Deletes
invasive species from the list of available plant materials. |
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ENGINEERING
|
| CHANNEL
STABILIZATION |
Specifies
options for hydrologic and hydraulic modeling. Adds critical
flow index to design. |
| CONDUIT
OUTLET PROTECTION |
Clarifies
when required. Allows for smaller stone riprap sizes and shorter
apron lengths. |
| DETENTION
BASIN FOR CONTROL OF DOWNSTREAM EROSION |
Modified
to be consistent with RSIS and DEP stormwater requirements.
Specifies options for hydrologic and hydraulic modeling. |
| DEWATERING |
NEW.
Specifies methods for dewatering ponded stormwater on the sites. |
| DIVERSIONS |
Specifies
options for hydrologic and hydraulic modeling. Incorporates
critical flows requirement. Includes criteria for slopes and
landfills. |
| DUST
CONTROL |
Adds
polyacrylamide as acceptable for dust control. |
| GRADE
STABILIZATION STRUCTURES |
Specifies
options for hydrologic and hydraulic modeling. Adds design
criteria for chutes and drop spillways. |
| GRASSED
WATERWAYS |
Specifies
options for hydrologic and hydraulic modeling. Incorporates
critical flows requirement. Accepts Texas DOT decisions for
evaluating materials. Adds design requirement for stone centerline
waterway. |
| LAND
GRADING |
Adds
requirement for tillage to address compaction. |
| LINED
WATERWAY |
Specifies
options for hydrologic and hydraulic modeling. Adds acceptable
concrete materials. |
| OFF-SITE
STABILITY |
NEW.
Establishes standards for determining impact to receiving channels
or adjacent property from stormwater runoff. |
| RIPRAP |
Specifies
options for hydrologic and hydraulic modeling. Adds section
on shoreline protection. |
| ROOFTOP
STORAGE |
Specifies
options for hydrologic and hydraulic modeling. Adds guidance
for operation and maintenance. |
| SEDIMENT
BARRIERS |
Clarifies
acceptable silt fence materials and maintenance requirements. |
| SEDIMENT
BASIN |
"Defers
to State, county or municipal basin design requirements. Adds
requirement for sediment removal. " |
| SLOPE
PROTECTION STRUCTURES |
Deletes
flexible down drains. Incorporates new design for conveying
runoff. |
| SOIL
BIOENGINEERING |
NEW.
Standard for stabilizing stream banks and shorelines. Specifies
materials based on site conditions and engineering analysis. |
| STABILIZED
CONSTRUCTION ACCESS |
Increases
stone pad length based on slope and adds requirements for stone
pads for individual lots when interior streets are paved. |
| STORM
SEWER INLET PROTECTION |
Expands
design criteria to require capture or filtering of 1 year storm
run off and safely convey higher flows into storm sewer. |
| TEMPORARY
STREAM CROSSING |
NEW.
Standard to prevent stream bank damage and sediment deposition. |
| SUBSURFACE
DRAINAGE |
Adds
requirement for geotextile filter materials to prevent drain
clogs in certain instances. |
| TRAFFIC
CONTROL |
Adds
requirement for tillage to address compaction. |
| FLOATING
TURBIDITY BARRIER |
NEW.
Standard for installation o floating barriers to contain sediment.
To be used where activities are located directly in or where
a pipe discharges to a stream or water course. |
| UNDERGROUND
DETENTION FACILITIES |
Specifies
options for hydrologic and hydraulic modeling. Adds guidance
for operation and maintenance. |
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RUNOFF TREATMENT
STANDARDS
|
| DRY
WELLS |
"NEW.
Standards for dry wells to capture, store and infiltrate runoff
from rooftops or other impervious areas one acre or less in
size." |
| EXTENDED
(DUAL PURPOSE) DETENTION BASINS |
NEW.
Design criteria for two stage detention basins for stormwater
quantity and quality control. |
| INFILTRATION
STRUCTURES |
NEW.
Design requirements for basins installed on permeable soils. |
| ON-LINE
WATER QUALITY STORM SEWER CATCH BASINS |
NEW.
Design requirements for catch basins with two or more chambers
for drainage areas of one acre per basin. |
| SAND
FILTERS |
NEW.
Design requirements for systems which direct stormwater runoff
through a sand filter. |
| VEGETATIVE
FILTER STRIPS |
NEW.
Design requirements for installing vegetated areas to receive
overland flows of stormwater to remove sediment and nutrients. |
| WET
PONDS |
NEW.
Design requirements for construction of permanent wet ponds
or basins with a drainage area of more than 20 acres. |