Exceptions and Pilot Studies: PDW Staff Guidance


Topics Under This Category:
Exception Criteria for Pressure Maintenance Facilities: Industrial Applications
Procedure for our staff to follow and factors to consider in reviewing requests for exceptions to minimum pressure maintenance capacity requirements.
 
Exception Procedure: Reviewing a Request to Use Innovative/Alternative Treatment Systems
Procedure for our staff to follow when reviewing requests to allow the use of unconventional, innovative, or alternative treatment technologies in a public drinking water system.
 
Exception Procedure: Reviewing Requests for Exceptions and Alternative Capacity Requirements
Procedure for our staff to follow when reviewing requests for exceptions to the public drinking water rules.
 
Exception Procedure: Reviewing Requests to Use Unitized/Package Water Treatment Systems
Procedure for our staff to follow in reviewing requests to use a self-contained drinking water treatment unit in place of conventional treatment in a public water system.
 
Exception Procedure: Sanitary Control Easements
Procedure for our staff to follow in reviewing request for an exception to the required 150-foot sanitary control easement for a public water supply well.
 
Membrane Terms Defined
Defines about 20 technical terms related to membrane filtration in drinking water treatment plants. Formulas for calculating 11 factors used in pilot studies or membrane filtration reports.
 
Review of Pilot Study Protocols for Membrane Filtration
Procedure for our staff to follow and factors to consider when reviewing protocols submitted for planned pilot studies for membrane filtration. Also of interest to anyone who plans to submit a protocol for review.
 
Review of Pilot Study Reports for Membrane Filtration
Factors our staff must consider in reviewing membrane filtration pilot studies.
 
Safety Factor for Water Pressure Tanks Less Than 1,000 Gallons
Conditions under which a small water system may qualify for an exception to the standard 4:1 safety factor. For this exception to be available, the water pressure tank must have a capacity of less than 1,000 gallons.