ISDS 



Although an alternate leaching area must be designated, no regulatory standards govern 

 alternative leaching area characteristics, or prevent the alternative area from being located in 

 a wedand or other unsuitable area. 



Neither the ISDS regulations nor the state building code establish standards for materials 

 to be used in ISDS, for the materials to be used in joining system components, or for use 

 of specific materials under site-specific conditions. 



Recommendations to RIDEM 



Revise ISDS regulations to: 



I ***Reflect system sizing recommendations devebped by the ISDS Task Force: 



Clearly define "bedroom" in SD 1.01 (a) as per Task Force recommendations; 



Establish minimum residential design flow based upon 3-bedroom design. 

 Amend Section 10.01 to require that all systems serving individual dwellings shall 

 be designed to serve a minimum of three bedrooms, unless evidence is submitted 

 that a deed restriction limiting dwelling size to an approved two-bedroom size has 

 been filed with the town's land evidence office. 



**Require that local building inspectors confirm sizing compliance prior to issuance of 

 occupancy permit, and forward certification, with results of construction inspection, to 

 applicable WWMD and ISDS section to be included with maintenanceAnspection records. 



*Defimtion of "impervious," (SD 1.12: Expand definition of impervious to include "rotten" 

 rock or shale-type fractured bedrock (as distinct from norrnalty fractured bedrock). 



I * Specify sidewall distance of ten feet from edge of leaching system to impermeable wall. 



^Encourage towns to require applicants for new ISDS construction to tie-in to public water 

 supply, where public water supply is reasonably available, to ensure safe drinking supply. 



\*Update minimum design flow requirements (SD 3.01) 



*Impose deed restrictions and/or attach covenant (in addition to disclosure provisions) 

 where recommended design flows are reduced by variance or special exception. 



\*Eliminate provision for 40 percent reduction in effective leaching area (SD 10.06). 



**Establish specific engineering specifications and criteria for materials and construction of 

 ISDS, specifically relating these to site characteristics of concern. Require use of Schedule 

 40 polyvinyl chloride, steel reinforcement, weighting and stabilization and other 

 specifications as appropriate to ensure against system failure and protect resources and 

 pubhc health. 



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