Horsham Water Quality Update. October 10, 2018

Transcription

1 Horsham Water Quality Update October 10, 2018

2 Short Term Remediation Action Plan: DEP has agreed to HWSA request to allow temporary system at Well 10 to be resin only when put back on the system HWSA continues to follow up with DEP on their two requests to have resin at Wells 10, 17 and 21 for the permanent systems. A driveway is under design off Sawyers Way to Well 26 to avoid parking restrictions during carbon change outs Well 7 Sept. test result: 13 ppt combined North Wales Water Authority: 1.2 mgd; 5.4 ppt combined (3.4 ppt PFOA & 2.0 ppt PFOS) Aqua PA interconnect Sept. test result: 12.3 ppt combined Well 9 is back on-line.

3 Long Term Remediation Action Plan: Contractor is moving along with the Group 1 permanent treatment systems at Wells 2, 20 and 22. Contractor expected to be done in December with wells pumping to waste Hoping for DEP operations permit in early 2019 Group 2 permanent systems include Wells 4 & 19 and the Aqua Interconnect. Well 4 and 19 are now under construction. Aqua PA interconnection construction is expected to expected to begin this Fall. Group 2 systems are expected to be operational in 2019 with Wells 4 & 19 pumping to waste by the end of the first quarter All main extensions are complete NWWA interconnection on County Line Rd is operational.

4 Private Wells: One new private well tested above LHAL, total is now at 104 (Navy - 99 and NGB - 5) 86 have been connected to the public system Navy followed up with the others that have never responded or previously rejected the offer to be connected to the public system & an additional 3 have now accepted connection. Phase III is under construction & is expected to be done by the end of October. It includes 4 properties: 2 on Easton Rd and 2 on Maple Ave. Park Creek Treatment Plant Wastewater: Effluent monitoring results averaging 25 ppt combined.

5 Stormwater: Horsham Air Guard Station: The old filtration system has been removed. New system will be a 4-step filtration process, removing organics before the carbon filters. New system is expected to arrive on August 10th and hopefully will be operational the same day. Navy Base: Looking to raise an inlet by 3 to 4 feet in a rear basin to hold more water & is expected to be done by end of September Continued discussions within the Navy on putting in a culvert connecting two basins since one basin doesn t hold as much water Soil Removal project: contractor is awaiting comments from the regulatory agencies (EPA & DEP) on their work plan then they will mobilize on site Surveying approximately 3,300 feet of stormwater pipes via TV inspections in September with a report in October Pump and Treat Systems: contract expected to be awarded by late September

6 Navy Stormwater Management Update Navy PFAS Soil Removal Action Status as of September 20, 2018: - Contract awarded - Contractor s Work Plan has been reviewed by US EPA and PADEP (all comments resolved) - Contractor to mobilize in October Work anticipated to take 1-2 months - Contaminated soils to be taken off-site and landfilled in approved landfill

7 Navy Stormwater Management Update Navy PFAS Soil Removal Action Navy Lodge Navy Aircraft Hangar #175 Areas where soils will be removed Navy Fire House

8 Navy Stormwater Management Update Navy PFAS Basin Action Status as of September 20, 2018: - Plan to extend riser pipe in north detention basin not yet completed (will be completed in October 2018) - Plan to connect detention basins with pipe still under consideration (being studied)

9 Navy Stormwater Management Update Navy Plan for Pilot Pump and Treat Plants Status as of September 20, 2018: - Contract will be awarded in FY 2018 (by end of September 2018) - Contract will be design/build - Work may involve temporary treatment plants to test feasibility - Type of treatment (GAC, ion-exchange/resin) still TBD - Two potential locations (one by hangars, one by fire fighter training area) - Discharge locations still TBD - Treatment standard still TBD

10 Horsham Air Guard Station Stormwater Management Update Status as of September 2018: - Updated carbon filtration system installed in August 2018 (replacing the temporary system installed in September 2017). Updated system attempts to remove organic compounds in stormwater before removing PFAS compounds (extending the life of the carbon) - System designed to reduce dry weather flow PFOA/PFOS concentrations to below 70 ppt - HAGS has applied for current NPDES permit from PADEP for stormwater discharges

11 Horsham Air Guard Station Stormwater Management Update

12 Horsham Air Guard Station Stormwater Management Update

13 Recap of Drinking Water Efforts: Currently, approximately 86% of water serving the public system is either filtered or supplied by NWWA. As of this update, the system-wide average in the public system is approximately 4 ppt combined. This is an average that is determined using a mass calculation formula. Horsham Township continues to achieve more stringent water quality standards than those set by EPA and DEP.