City of Cape May Water System Master Plan Review Presentation to Mayor & Council Council Work Session March 3, 2020 Thomas R. Thornton, PE, CME Mark A. Tompeck, PE, DBIA, ENV SP Brian T. Dougherty, PE
Water System Master Plan Scope • City’s goal is to continue to provide water supply that is: • Safe – meets all current/proposed drinking water quality standards & regulations • Adequate – satisfactory capacity and pressure for public consumption and fire protection • Reliable – minimizing the potential for service interruptions • Economical - cost-effective system operation and improvements • Objectives of Master Plan: • Assess current system condition • Review regulatory compliance for system operation & water quality • Evaluate production capabilities & distribution system • Master Plan Result: • Comprehensive assessment system assets and operations • Recommendations for future improvements Mott MacDonald March 3, 2020
Water System Master Plan Contents • Overview & History • Water Demand Analysis • Water Allocation Evaluation • Review of Source Water Quality • Review of Operations and Maintenance • Assessment of Water Distribution & Storage • Assessment of Water Production & Treatment • Recommended Capital Improvement Program Mott MacDonald March 3, 2020
Water System History • Water Supply Timeline • 1910 – 1940 – City supplied by shallow, unconfined wells • 1940 – 1950 – City supplied by Cohansey Aquifer Well Nos. 1 and 2 • Well Nos. 1 & 2 were located in the City; eventually abandoned due to high chloride levels • 1940’s – Coast Guard base added to service area when their also had to be abandoned. • 1950 – 1998 – City supplied by Cohansey Aquifer Well Nos. 3, 4 & 5 • Wells were located further inland – Well No. 3 at WTP and Well Nos. 4&5 along railroad in Lower Twp. • 1972 – Cape May Point and West Cape May added to service area after their wells failed • 1994 – Well No. 3 taken off line due to water quality • 1997 – Well No. 4 taken off line due to water quality • 1998 – City supplied by Desalination Facility • 2017 – City constructs Well No. 8 Mott MacDonald March 3, 2020
Water System Overview • Cape May City Municipal Water System • Consists of source, treatment, transmission, distribution and storage infrastructure. • Serves approx. 5,000 permanent customers in Cape May City and wholesale customers: • Cape May Point • West Cape May • US Coast Guard Base • System Demands • Average Day Demand = 1.1 million gallons per day (MGD) • Maximum Day Demand = 2.91 MGD • Summer Demands = 4 times normal ‘off-season’ demand • Non-revenue (unaccounted-for) water is approx. 16% • Future Demand projections show a minor increase (5%) in demands over 10 years Mott MacDonald March 3, 2020
Water Allocation Evaluation • Water Allocation Process • Regulated by NJDEP Bureau of Water Allocation • Details operating limits and criteria for monitoring & reporting • City’s Permit in effect to Sept. 2026 • Allocation Permit Conditions & Surplus/Deficit Analysis Historical Maximum Allocation Surplus (+) / Parameter Demand Permit Limits Deficit (-) Annual Allocation - All Wells (MGY) 574.20 838.00 +263.80 Monthly Allocation - All Wells (MGM) 91.23 115.00 +23.77 Annual Allocation 112.63 160.00 +47.37 Cohansey Aquifer (MGY) Annual Allocation 462.95 678.00 +215.05 Atlantic City 800-Ft Sand Aquifer (MGY) Mott MacDonald March 3, 2020
Assessment of Distribution & Storage Facilities • Distribution System: • 190,000 ft (36 miles) of 1” to 16” water main piping • Two water storage tanks • Canning House Lane Standpipe – 1,000,000 gallons total capacity (450,000 gallons effective capacity) • Madison & Columbia Ave Elevated Tank – 700,000 gallons capacity • Transmission Mains • Stimpson Lane Transmission (10” & 12”) – supply W. Cape May & Cape May Point • Broadway Transmission Main (12”) – supply to downtown & W. Cape May • Cape Island Creek Transmission Main (16”) – crosses Cape Island Creek and marsh areas • System Evaluation • Developed WaterGEMS hydraulic model to analyze system performance • Analyzed both summer and winter conditions • Water storage assessment to confirm compliance with Water Supply Management Act Mott MacDonald March 3, 2020
Assessment of Distribution & Storage Facilities Mott MacDonald March 3, 2020
Assessment of Distribution & Storage Facilities • Findings • Wholesale metering improvements • Current W. Cape May metering is calculated using 6 different meters • Connections from Broadway Transmission Main • Storage Analysis • Existing 1.15 MG effective storage in 2 tanks is adequate • Modeling analysis to review system performance (flow & pressure) & fire protection capability • Identified 4 primary distribution improvements • Approx. 12,000 LF of improvements to upsize mains and complete loops to improve flows • Identified transmission improvements • Cape Island Creek 16” ACP Transmission Main rehabilitation • Transfer ownership of Broadway Transmission Main & construct paralled main on Park Boulevard Mott MacDonald March 3, 2020
Review of Operations and Maintenance • Water Quality Accountability Act (N.J.S.A. 58:31-1): • Enacted July 21, 2017 & Effective October 19, 2017; Administrative code still under development • Applies to water purveyors with more than 500 service connections • Intent is to improve safety, reliability, and administrative oversight of water infrastructure • Requirements: • Maintenance requirements for valves & hydrants • Locate & GPS all valves / Exercise <12” every 4 years / Exercise 12”> every 2 years • Locate & GPS all hydrants / test all hydrants annually • Record keeping for maintenance activities • Mitigation plans for NJDEP violations • Asset Management Plan • Annual Certification Mott MacDonald March 3, 2020
Review of Operations and Maintenance • WQAA Compliance • Valves & hydrants – GPS located as part of GIS development • Record Keeping – capabilities in GIS and MM-Fit • Asset Management Plan – completed (Water Master Plan) • Recommendations • Implement computerized maintenance management system (CMMS) • Develop formal valve inspection and maintenance program • Utilize GIS to record maintenance information for valve and hydrants Mott MacDonald March 3, 2020
Review of Source Water Quality • Atlantic City 800-Foot Sand Aquifer • Elevated sodium & chloride (above NJDEP Recommended Upper Limit (RUL)) • Water quality has been and is expected to remain relatively stable • Operation of Well No. 8 will impact aquifer and current monitoring program should continue • Cohansey Aquifer • Elevated iron (above NJDEP RUL) • Elevated sodium & chloride (above NJDEP RULs) with upward historical trend • Should not be considered a viable long-term water supply source Mott MacDonald March 3, 2020
Assessment of Water Supply & Treatment Facilities • Water Supply provided by 2 sources: • Desalination Facility • Supplied by Well Nos. 6 & 7 – 1,000 GPM permitted capacity • Desalination system – 68% recovery ratio • Well No. 5 • Sequestering treatment for elevated iron • High Service Pumps • Can pump from standpipe or Lower Twp. interconnection into distribution system Mott MacDonald March 3, 2020
Assessment of Water Supply & Treatment Facilities • Assessment of Water Supply & Treatment includes: • Condition Assessment – performed on all facilities • Review of Firm Capacity • NJDEP Safe Drinking Water Regulation – System must have firm capacity to meet peak demands • Firm capacity deficit = 0.30 MGD Feed Rate Recovery Production Source (MGD) Ratio Rate (MGD) Desal Train 1 1.44 0.68 0.98 Desal Train 2 1.44 0.68 0.98 Well No. 5 - - 1.01 Total Production Capacity 2.96 Firm Production Capacity 1.96 Current Maximum Month Average Day Demand 2.26 Surplus (+) / Deficit (-) -0.30 Mott MacDonald March 3, 2020
Assessment of Water Supply & Treatment Facilities • Desalination Facility • Rated for 2 MGD • Supplied by Well Nos. 6 & 7 (Well No. 8 is backup) • Utilizes Reverse Osmosis (RO) technology • Consists of two RO membrane trains • Desalination System Equipment • Anti-scalant chemical feed system • Cartridge Filters – 4 filters, rated for 500 GPM each • Feed pumps – 3 vertical pumps, 1,000 GPM & 200 Hp each • Membranes – 2 skids, 26 pressure vessels per skid • Clean-in-Place System – chemical feed to clean membrane 2x per yr. • Post-Treatment chemical feed – lime feed and calcium hypochlorite Mott MacDonald March 3, 2020
Assessment of Water Supply & Treatment Facilities Mott MacDonald March 3, 2020
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