On-Site Treatment Works Presentation.ppt

							On-Site Treatment Works


         Presentation to:
    Rappahannock River Basin
          Commission
          By Joel S. Pinnix, PE
             June 24, 2009
            Joel S. Pinnix, PE
PE with 26 years experience
Obsidian, Inc since 2002 (Richmond & Tappahannock)
Onsite Treatment
 – Represents ACEC of VA on Sewage Handling Advisory Committee
 – Represents ACEC of VA on Engineer Design Review Panel
 – Serves on Ad Hoc Committee for Policy – HB 1166
 – Serves on Emergency Regulation Ad Hoc Committee – HB 2551
 – Serves on DPOR/VDH Ad Hoc Committee for HB 2072/SB 1008
 – Served on Del. Suit’s Housing Commission Workgroup for Onsite
   Systems (2007)
Principal Author of HB 1166
Traditional Septic System
     Traditional Gravity Soil
       Absorption System




Distribution Box

                    Gravel Trench
Typical Dispersal Area




          Dispersal Area
          Treatment Levels
Conventional – Primary Treatment (50%)
– Anaerobic Process
– Soil is critical - adds additional treatment
– Soil provides for absorption/dispersal of effluent
Alternative – Secondary Treatment (90%)
– Typically Aerobic Process
– Soil only provides tertiary treatment (minor)
– Soil provides for absorption/dispersal of effluent
– May be discharged with disinfection
Effluent Comparison
Single Pass Media Filter – Puraflo &
             Ecoflo
Tricking Filter Attached Growth -
             Advantex
Submerged Suspended Growth -
        Clearstream
Submerged Attached Growth –
        MicroFAST
Recirculating Media Filters – E-ZTreat &
                BioCoir
Engineered Dispersal
      Systems
Pressurized Distribution
 – Low Pressure Trench Distribution
 – Drip Irrigation
        Types of Systems
Single Family Homes – On Lot
– Treatment – Conveyance – Dispersal
Community Based Systems
– Conveyance to Central Treatment & Dispersal
– On Lot Treatment – Conveyance to Central Dispersal
Alternative Discharging Systems
– Compliant with VDH Regulations & DEQ General
  Permit (Single Family Homes)
– All Others Compliant with DEQ General Permit
       Who Designs What
VDH
– Prescriptive Conventional Systems Only
AOSE’s
– Prescriptive Conventional or Alternative
– Gravity or Simple Pump to Gravity Dispersal
PE’s (HB 1166)
– Performance Based Systems
       – Prevent Groundwater Pollution, Backup of Sewage and
         Surfacing of Effluent
– Standard Engineering Practice
– Critical Horizontal Setbacks
   Upcoming VDH Action
Emergency Regulations for Performance
Based Design and Operation &
Maintenance Requirements for Alternative
Systems (July 1 2009 + 280 days)
NOIRA to Rewrite Onsite Regulations
(September 2008)