| Hedin Environmental's Passive Treatments Projects | |||||
| System / Location | Year | Average Influent Quantity/Quality | Effluent Quality | Design | HE Role |
| Bilger Run Clearfield County |
2008 | 20 gpm, net acid, 50 mg/L, Fe10 mg/L | alkaline Fe <1 mg/L | ALD, existing settling ponds | Project management, design, construction oversight |
| Wilson Run Westmoreland County |
2007 | 150-1200 gpm, net alkaline, Fe 30 mg/L | pH 7, Fe 1-5 mg/L Fe | cleaned out and redesigned setttling pond | Design, permitting, construction oversight, O&M Plan |
| LC20D / Little Coon Run Clarion County |
2007 | 55 gpm, net acid 200 mg/L, Fe 110 mg/L | Fe<5 mg/L, pH 5-6 | ALD, pond, wetland | Design, permitting, construction oversight, O&M Plan |
| Lowber / Sewickley Creek Westmoreland County |
2007 | 1,660 gpm, net alkaline, pH 6.2, Fe 74 mg/L | pH 7-8, Fe<1 mg/L | Iron Oxide production ponds (6) and aerobic wetland | Design, permitting, construction oversight, O&M Plan |
| Lewis System Sullivan County |
2006 | 75 gpm, pH 4, acid 75, Al 10 mg/L | pH 6-7, net alkaline, Al and Fe < 1 mg/L | vertical flow pond | Design |
| Audenreid / Catawissa Creek Schuylkill County | 2005 | 8,500 gpm, net acidity 70 mg/L, Al 8 mg/L, Fe < 1 mg/L | Al < 3 mg/L total, < 1 mg/L dissolved | Three large self-flushing limestone tanks, 2 ponds | Developed conceptual design; oversaw design firm (RETTEW), developing O&M Plan |
| Robbins Hollow Complex / Kettle Creek Clinton County |
2005 | < 5 - 200 gpm, | variety of discharges; summed flow is pH 6-7 with Fe and Al < 1 mg/L | 4 minisystems incuding an ALD, two OLDs, 4 VFPs, and ponds | Design, permitting, construction oversight, O&M Plan |
| Mitchell Self-Flusher / Babb Creek Tioga County | 2005 | 40 gpm, acid 440 mg/L, Fe 10 mg/L, Al 30 mg/L | initally, pH 5-6 Fe and Al < 3 mg/L; declined to 50% effective after 6 months | Self-flushing limestone bed, settlign pond | Design, permitting, construction oversight, O&M Plan |
| K&J Coal, Pond 23 Site
(bond forfeiture COA) |
2005 | 75 gpm, pH 5, Al 2 mg/L, Mn 5 mg/L, Fe < 1 mg/L | Net alkaline40 mg/L, Al < 1 mg/L; Mn <1 mg/L; Fe < 1 mg/L | VFPs (2), flush system, settling pond | Managed technical components system design, construction oversight, and O&M Plan |
| K&J Coal, Pond 4 Site (bond forfeiture COA) |
2005 | 200 gpm, pH 4.5, Al 10 mg/L, Mn 40 mg/L, Fe < 1 mg/L | Net alkaline 90 mg/L, Al < 1 mg/L; Mn <1 mg/L; Fe < 1 mg/L | VFPs (2), flush system, settling pond and oxic LS bed | Managed technical components system design, construction oversight, and O&M Plan |
| K&J Coal, Pond P Site (bond forfeiture COA) |
2005 | 150 gpm, pH 3.5, Al 15 mg/L, Mn 40 mg/L, Fe < 1 mg/L | Net alkaline 40 mg/L, Al < 1 mg/L; Mn <5 mg/L; Fe < 1 mg/L | VFPs (3), flush system, settling pond, wetland | Managed technical components system design, construction oversight, and O&M Plan |
| K&J Coal, Gaber-Brown Site (bond forfeiture COA) |
2004 | 200 gpm, pH 3.5, Al 25 mg/L, Mn 40 mg/L, Fe < 1 mg/L | Net alkaline 50 mg/L, Al < 1 mg/L; Mn <1 mg/L; Fe < 1 mg/L | VFPs (2), flush system, settling pond, oxic LS bed, wetland | Managed technical components system design, construction oversight, and O&M Plan |
| LERMD20 / Elk Run Jefferson County |
2003/04 | 125 gpm, net acid 230 mg/L, Fe 15 mg/L, Al 12 mg/L | Net alkalinity 100 mg/L, Fe < 1. Al < 1 | Downflow compost bed, upflow LS bed with flushing, pond, wetland | Design, permitting, construction oversight, O&M Plan |
| Anna S Mine Complex / Babb Creek Tioga County |
2003 | 440 gpm, pH 3, Fe 10 mg/L, Al 10 mg/L | Net alkaline, Fe < 1 mg/L, Al < 1 mg/L | VFPs (4), flush system, and polishing wetland | Conceptual design, construction oversight and project management |
| Hunters Drift / Babb Creek Tioga County |
2003 | 330 gpm, pH 3, Fe 50 mg/L, Al 25 mg/L | Net alkaline, Fe < 1 mg/L, Al < 1 mg/L | VFPs (4), flush system, and polishing wetland | Conceptual design, construction oversight and project management |
| Soberdash, Eastern Discharge (bond forfeiture COA) | 2003 | 1 - 200 gpm; pH 3-4, Fe 10-50 mg/L, Al 1-10 mg/L | per PADEP, net alkaline with low metals under design conditons | oxic limestone channel, oxic limestone bed | conceptual design and plan rewiew (with RAR Engineering) |
| Soberdash, MD1 and MD2 (bond forfeiture COA) |
2003 | 5-50 gpm, net acid, pH 5, 12-35 mg/L | per PADEP, net alkaline | ALD, pond, wetland | conceptual design and plan rewiew (with RAR Engineering) |
| Scrubgrass / Scrubgrass Creek Allegheny County | 2003 | 175 gpm, net alkaline, pH 6.0, 70 mg/L Fe | Net alkaline, pH 6.5, Fe 30-40 mg/L | Two settling ponds with Maelstrom Oxidizer | System redesign and project management |
| Ace Drilling, Site 26 (bond forfeiture COA) |
2002 | 20-100 gpm, net acid, pH 5, Fe 130 mg/L, Al 1-2 mg/L | net alkaline, Fe < 2 mg/L | ALD, reconfigured settling pond constructed wetland | conceptual design and plan review (with Minetech, Inc.) |
| Ace Drilling, Site 26A (bond forfeiture COA) |
2002 | 1-10 gpm, pH 3-4, Fe 130 mg/L, Al 9 mg/L | net alkaline, Fe and Al < 2 mg/L | VFP, reconfigured settling pond, oxic limestone bed | conceptual design and plan review (with Minetech, Inc.) |
| JRU 88 and 89 / Johnson Run Elk County |
2002 | 100 gpm, Fe 5 - 15 mg/L, Al 10 mg/L, net acid 100 - 150 mg/L | Net alkalinity 60 mg/L, Fe < 1 mg/L, Al < 1 mg/L | Self-flushing LS, VFP, settling Pond, and aerobic wetland | Complete design and project management |
| Conifer East, Beaver Run Jefferson County |
2001 | 10-50 gpm | net acid, pH 4, Fe 1-10 mg/L, Al 1-8 mg/L | alkaline-amended wetland followed by oxic limestone bed | Complete design and project management |
| Little Hefren / Toms Run Cook Forest State Park Clarion County |
2001 | 15 gpm, net acid, pH 5.8, Fe mg/L Fe | Net alkaline, Fe 1-5 mg/L | ALD, settling pond and aerobic wetland | Complete design and project management |
| Keystone Power Plant Armstrong County |
2000 | 5-40 gpm, net acid, pH 3.5, Fe 40 mg/L, Al 6 mg/L | alkaline water with <2 mg/L Fe and Al | VFP and constructed wetland | Conceptual design and construction consultation |
| Conifer West, Beaver Run Jefferson County | 1998 | 0-200 gpm, net acid, pH 4.4, Fe 30 mg/L, Al 2 mg/L | net alkaline with Fe and Al <1 for 4 years; variable effluent since 2003 | ALD, settling ponds, and aerobic wetland | Complete design and project management |
| C&K Pit 601 / Mill Creek Jefferson County |
1997 | 80 gpm, net acid, pH 5.7, Fe 80 mg/L | Net alkaline, Fe < 7 mg/L | ALD, reconfigured constructed wetland | Design of ALD and reconfigured system |
| SR-101A / Slippery Rock Creek Butler County | 1996 | 30 gpm, net acid, pH 5.5, Fe 90 mg/L | Net alkaline, Fe 9 mg/L | ALD, settling pond and aerobic wetland | Conceptual design, project management |
| Delta Maust, Somerset County (bond forfeiture COA) |
1996 | 25-50 gpm, net acid, pH 3, Fe 23-34, Al 6-7 | reported by PADEP to be net alkaline, Fe and Al < 2 mg/L | two VFPs followed by aerobic wetland | system design (with CDS, Inc.) |
| SR 114D, Slippery Rock Creek Butler
County (bond forfeiture COA) |
1995 | 125 gpm, net acid, pH 5.8, Fe 40 mg/L | Net alkaline with Fe 1-10; | ALD, settling pond and aerobic wetland | Conceptual design, construction oversight, project management |
| SR-114B, Slippery Rock Creek Butler County (bond forfeiture COA) |
1995 | 40 gpm, net acid, pH 6.0, Fe 20 mg/L | Net alkaline, Fe < 10 | ALD and settling pond | Conceptual design, construction oversight, project management |
| Area 1 Passive System Sequatchie Valley Coal Dunlap TN |
1995 | 200 gpm; net acid, pH 5.8, Fe 120 mg/L, Mn 40 mg/L | Net alkaline discharge with Fe < 1 | ALD, settling ponds, aerobic wetland | Conceptual design and construction consultation |