    
        
NPDES Phase 1
Post-Cosntruction
The 2009
Storm Water
Quality Control Criteria (2009 SWQCCP) for the County of San
Joaquin (County) is an update to the County’s 2003 SWQCCP with
special emphasis on the implementation on low impact development
(LID) strategies. LID is an environmentally sound technology and
an economically sustainable approach to addressing the adverse
impacts urbanization can have on aquatic resources. LID's goal
is to mimic a site's predevelopment hydrology by using design
techniques that infiltrate, filter, store, evaporate, and detain
runoff close to its source. SWQCCP strategies are not only
applicable to open space, but also rooftops, streetscapes,
parking lots, sidewalks, and medians. LID is a versatile
approach that can be applied equally well to new development,
urban retrofits, and redevelopment/revitalization projects. By
managing runoff close to its source though intelligent site
design, LID can enhance the local environment, protect public
health, and improve community livability |
- Protect the water of the County
from adverse impacts of urban runoff;
- Ensure that the implementation of
the measures is consistent with NPDES permit and other State
requirements;
- Provide clear development standards
for developers, design engineers, agency engineers, and
planners to use in the selection and implementation of
appropriate storm water control measures;
- Integrate
LID strategies; and
- Provide
maintenance procedures to ensure that the selected control
measures will be maintained to provide effective, long-term
pollution control.
|
The
2009 SWQCCP only applies to
Priority projects in the NPDES Phase 1 Area. The County
has created a tool called the Volume Reduction
Requirement Calculator to help developers recognize when they
have achieved the volume reduction requirement. For a map
of the NPDES Phase 1 Area, the 2009 SWQCCP, a fact sheet of the
2009 SWQCCP and the Volume Reduction Requirement
Calculator click on the appropriate links below.
 |
Priority projects are defined as:
-
Significant redevelopment (addition of 5,000 ft2
or more);
- Home subdivisions of 10 housing
units or more;
-
Commercial development 5,000 ft2
or more;
- Automotive repair shops;
- Restaurants;
-
Parking lots 5,000 ft2
or more or with
25 or more parking spaces;
- Streets and roads greater than
one acre of impervious area;
- Retail gasoline outlet.
|
|
LID techniques include:
- Preserve natural hydrology;
- Manage storm water close to the
rain falls;
- Minimize site disturbance and
grading;
- Retain vegetation;
- Cluster development;
- Reduce impervious surface;
- Reforestation;
- Bioretention systems;
- Landscape with native plants;
- Compost amended soils;
- Pervious concrete;
- Porous asphalt;
- Permeable pavers;
- Eco roofs (green roofs)
|

 |

PO Box 1810 / 1810 East Hazelton Avenue, Stockton, California 95201 | Phone (209) 468 - 3055 |
|