Zoning Appendix F. - Individual Sewage Disposal Systems (Isds) Table 2

ZONING APPENDIX F. INDIVIDUAL SEWAGE DISPOSAL SYSTEMS (ISDS) TABLE 2

OWTS TREATMENT FOR RESOURCE PROTECTION AREAS

CRITICAL RESOURCES ISLAND RESOURCES

TOWN OF NEW SHOREHAM

	Critical Resources				Island Resources
Site Vulnerability Rating	Peckham, Sands & Fresh Pond Reservoir Watersheds & Associated WHPA's	Other WHPA	Great Salt Pond Watershed	Wetland Buffers to Critical Resources	Island Aquifers	Wetland Buffers
Extreme, Repairs Only	T2C	T2C	T2N	T2	T2	T2
High to Extreme	T2C	T2C	T2N	T2 & ≤ 450 gpd & < 1880 sq ft Dwelling	T1 or T2	T2
Moderate	T2C	T1	T1	T2 & ≤ 450 gpd	T1	T1
Low	T2C	T1	T1	T2 & ≤ 450 gpd	T1	T1

 

1. Shallow dispersal trenches may be required in certain T2 areas where the soil rating is high or extreme, where the OWTS is in a wetland buffer or where other site constraints exist.

2. In Island Resource Areas, where T2 treatment levels are stipulated either T2C or T2N system may be required, based on specific site characteristics.

3. All T2 systems in wetland buffers to critical resources shall meet either a T2N or T2C treatment as specified for the watershed or wellhead area in which they are located.

4. Where the water table depth is 4 to 6 feet and soil is excessively permeable and no other constraint exists to result in High Site Vulnerability Rating, T1 treatment may be allowed.

5. A T1 treatment system may be permitted where the wetlands is only associated with open ocean waters.

6. A T1 treatment system may be permitted where the wetlands is only associated with open ocean waters.