Reclaimed Water Solution for Disposal Capacity Village of Bald Head Island 2015 NC AWWA - WEA Annual Conference November 17, 2015

Bald Head Island Brunswick County Columbus County New Hanover County Bladen County Brunswick County Pender County North Carolina Bald Head Island

History & Project Drivers  0.4 MGD SBR Wastewater Treatment Facility - Original owner Bald Head Island Utilities (private) - Low pressure collection system - 3 High Rate Infiltration (HRI) Basins - HRI basins permitted at 0.8 MGD disposal capacity WWTP HRI Basin 3 HRI Basin 2 HRI Basin 1

History & Project Drivers  Utility Ownership Transferred to Village of Bald Head Island - Transfer occurred late 90’s - Contractual obligation - island build-out capacity WWTP HRI Basin 3 HRI Basin 2 HRI Basin 1

HRI Basin 3 Issues  Lowest elevation on the island  Prone to flooding  Valve closed – unused for disposal  Did not meet compliance or review boundary rules  Bald Head Island Club (Golf Course) requested pond be removed from permit for drainage purposes  Village required alternate disposal to meet contractual obligation with developer HRI Basin 3 487,165 GPD HRI Basin 2 181,492 GPD HRI Basin 1 131,343 GPD Original Disposal Capacities

Phase I - Interim  Phase I - Interim - Reshape Basin 1 & 2 (0.4 MGD) - Concurrent with GC Hole Rebuild - Permit Revised to “include” Pond 3 but stipulated must be compliant before activation  Provided “Breathing Room” to determine final solution HRI Basin 3 (inactive) HRI Basin 2 75,295 GPD HRI Basin 1 324,705 GPD Modified Disposal Capacities

Phase II – Final  Explore Alternatives for Disposal >0.4 MGD - Initial step: 0.8 MGD build-out reduced to 0.65 MGD MGD Need – 0.4 MGD HRIB = 0.25 MGD deficit  Alternatives Considered - Alt. A - Reconfigure/Reshape HRI Basin 3 - Alt. B - Groundwater lowering system for basins 1 & 2 - Alt. C - Convert storm drain pond(s) to HRI basins - Alt. D – Golf Course Reuse

Alternative A Reconfigure/Reshape HRI Basin 3  Advantages - Meet build-out capacity needs - Maintain current WWTP effluent limits  Disadvantages -Require reconfiguration of the golf hole -Easement/Land Acquisition to meet Compliance and Review boundaries -Challenges with freeboard, drainage due to low elevations HRI Basin 3

Alternative B Groundwater Lowering System HRI Basin 1 & 2  Advantages - Meet build-out utilizing current HRI Basins - Maintain current WWTP effluent limits  Disadvantages -Similar to HRI Basin 3 – challenges associated with regulatory requirements compliance & review boundaries -Ponds function as storm drain for the course and island -Easement/Land Acquisition required for boundaries HRI Basin 1 HRI Basin 2

Alternative C Convert Storm Drain Pond(s) to HRI Basins  Advantages - Build-out with additional HRI basin(s) - Maintain current WWTP effluent limits  Disadvantages -Significant infrastructure $$ -Impact to golf course -Easement/Land Acquisition -O&M costs long term - Flooding concerns

Alternative D - Recommended Golf Course Reuse  Advantages - Meets build-out needs - Public Acceptance - Desirable by all parties - Utilizes GC Irrigation System  Disadvantages - WWTP Effluent Limit Requirements - 5-Day Upset Pond (land intensive) - Wet Weather Storage (land intensive) - Village Water Supply Wells - Club Irrigation Wells

Proposed Irrigation Areas (Existing GC System)  Dedicated Disposal Capacity - 250,000 GPD Reuse Non-Conjunctive - 400,000 GPD HRI Basin Capacity 650,000 GPD Total Disposal Capacity  Total Reuse Capacity - 250,000 GPD Non-Conjunctive (Front 9) - 400,000 GPD Conjunctive (Back 9) - Normal Conditions – All effluent to GC  Irrigation/Production Well Conflicts Non-Conjunctive Areas Conjunctive Areas HRI Basin 2 HRI Basin 1

Reclaimed Water Storage Non-Conjunctive Areas Conjunctive Areas HRI Basin 2 HRI Basin 1 GC Irrigation Pond & PS Reuse FM From WWTP  Utilize current irrigation pond PS system  Unable to comply with DENR Setbacks (property lines, homes, surface waters)  House Bill 74 – allowed waivers for setbacks and 0’ setbacks for reclaimed water storage ponds if effluent meets: - 10 mg/l Total Nitrogen - 2 mg/l Total Phosphorous  Required plant modifications to meet TN/TP limits: - Mag Hydroxide Chem Feed - Alum Chem Feed - Carbon Source Chem

5-Day Upset Pond Non-Conjunctive Areas Conjunctive Areas HRI Basin 2 HRI Basin 1 GC Irrigation Pond & PS Reuse FM From WWTP  Utilize HRI Basins 1 & 2 for Upset Pond MGD Reqd. (0.25 MGD) - Maintain ambient level in each - Meets required volume  Reuse Force Main System Design - Valve/Metered to HRI 1 & 2 - MOV for non-compliant reuse - Controlled by GC Reclaimed Water Meter/Control Valve

Proposed Project  WWTP Improvements Blower Upgrades Magnesium Hydroxide Chemical Feed Aluminum Sulfate Chemical Feed Micro-C Chemical Feed Backup Chlorine Disinfection SCADA/Telemetry Modifications  Reuse Transmission System 1,000 LF 10” Reuse Force Main Reuse Meter & Control Valve Vault Meter & Control Valve Vaults HRI Basin 1 & 2 SCADA/Telemetry Additions  Anticipated Completion Date May 2016 Village BHI WWTP

Questions? Contact Information: Tony Boahn, PE