Zoning Appendix E. - Individual Sewage Disposal Systems (Isds) Table 1

ZONING APPENDIX E. INDIVIDUAL SEWAGE DISPOSAL SYSTEMS (ISDS) TABLE 1

SITE VULNERABILITY FOR AN ONSITE WASTEWATER DISPOSAL SYSTEM

TOWN OF NEW SHOREHAM

	Site Characteristics
Critical Depth	Depth to Seasonal High Water Table	Depth to Restrictive Layer and/or bedrock	Depth to Water Table AND One of the Following: Restrictive Layer Or OWTS Soil Category 1 soils
< 2 ft.	Extreme, Repairs Only	Extreme, Repairs Only	Extreme, Repairs Only
2 ft. to < 4 ft.	High	Extreme, Repairs Only	Extreme, Repairs andNew Construction
4 ft. to 6 ft.	Moderate	High	High
> 6 ft.	Low	Moderate	Moderate

 

1. All depths are measured from the original ground surface. Maps developed from the RI Geographic Information System (RIGIS) are available to show approximate depths to water table at 0 to 1.5 feet and 1.5 to 3.5 feet. Mapping is not available to show water table depths greater than 3.5 feet. These maps are to be used only as a planning tool. Actual measurements must be obtained from on-site date. In the event that critical depths for the various site characteristics overlap, the most restrictive shall apply.

2. Restrictive layer and or bedrock are identified as category 10 soils in the RIDEM OWTS Rule.

3. Excessively permeable soils and have the potential to contaminate groundwater due to limited pollutant removal capability with rapid drainage. Excessively permeable soils includes all highly permeable well drained soils (hydro group A) and other excessively permeable soil groups, as identified in the OWTS Rules as category 1 soils.