ISDS 



Revise ISDS regiolations to: 



***Establish minimum buffers of at least 400 feet from ISDS to all public 

 wells serving 25 or more persons for six months per year or longer, an 

 increase of 200 feet above current requirements. 



***Revise ISDS regulations and variance granting procedures to stipulate 

 that variances for standard system construction will not be granted in areas 

 where the water table is less than 3 feet below ground surface. 



**For large systems or subdivisions (combined flow exceeding 2000 gpd), 

 develop regulatory standards which provide for adequate separation based 

 upon soil conditions, effluent characteristics, and other site specific 

 conditions. Increase buffers where total flows exceed 2000 gpd, and where high 

 intensity residential, commercial, or industrial use is anticipated. Establish maximum 

 loading of 2000 gallons/day/acrc under specified conditions. Use of a point-based system 

 such as that described in SITE EVALUATION, below, may be applied to determine the 

 level of technical evaluation necessary to establish design and siting requirements. 



**Develop cumulative impact assessment procedures based upon 

 contaminant loading to consider potential impacts of a) new systems in 

 areas developed beyond carrying capacity, and b) large systems and 

 subdivisions where combined flow exceeds 2000 gpd. 



Individual Wells 



Revise ISDS regulations to: 



***Increase setbacks from all parts of ISDS from 100 feet to 150 feet 

 where soils are excessively permeable (percolation rate exceeding 5 

 minlinch) and where fractured rock occurs. 



**E5tablish four foot groundwater separation in excessively permeable 

 soils (percolation rate exceeding 5 minlinch). Require five foot depth to the natural water 

 table from original ground surface. 



**Require five foot separation distance from the bottom of the leach field 

 to fractured bedrock (equivalent to six feet from the original ground surface to protect 

 against channeling of effluent. 



**Develop cumulative impact assessment procedures based upon 

 contaminant loading to consider potential impacts of a) new systems in 

 areas developed beyond carrying capacity, and b) large systems and 

 subdivisions where combined flow exceeds 2000 gpd. 



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