BBWSD Water and Sewer Comprehensive Plans
July 11, 2019 Public Hearing
Water Plans: https://chs.egnyte.com/dl/yL8ueJ6GSP
Sewer Plans: https://chs.egnyte.com/dl/CFixf0prAK
Comprehensive Plans – Why?
Prudent management
Required
- RCW 57 – Special Purpose Districts – “General Comprehensive Plan of Improvements”
- Department of Health – “Water System Plan”
- Department of Ecology – “General Sewer Plan”
Basis for Calculation of General Facilities Charges
District Boundary and Service Areas
Boundary – legal boundary, voting rights, ULID limits, service charges discretion
Retail Water Service Area
- added parcels west of Jackson around former church and two parcels SE of Bay Rd/Jackson Rd
- refined discussion of “timely and reasonable”
Sewer Service Area
- significantly reduced – limited to current UGA plus several parcels where service already provided
Cherry Point Refinery – water and sewer service by separate agreements
Population and Growth
Consistent with Local Land Use Jurisdiction – Whatcom County Comprehensive Plan (2016)
- 2013 baseline data, forecast through 2036
- Birch Bay UGA study – UGA growth allocation (5,282 additional persons) – 2.34% annual growth
- In UGA average household size of 1.43 (2013)
- Outside UGA – population growth varies based on Rural lands forecast by BERK (<1%) or CHS review of remaining available lots in smaller defined areas
- Extended forecast to 2038 – assume 1% annual growth after County forecast
Service Area Population Projections
Water Service Area | Sewer Service Area | ||||
2013 | 2038 | 2013 | 2038 | ||
Birch Bay UGA | 7,540 | 13,080 | Birch Bay UGA | 7,540 | 13,080 |
UGA Reserve Area | 36 | 44 | UGA Reserve Area | 6 | 6 |
City of Blaine | 2 | 4 | Loomis Trail | 175 | 216 |
Blaine UGA | 36 | 68 | Sunday Harbor/ Maple Leaf | 258 | 263 |
Rural lands | 1,196 | 1,468 | Plaza Park | 60 | 69 |
Misc Served Parcels | 10 | 10 | |||
Total – Water Service Area | 8,810 | 14,663 | Total – Sewer Service Area | 8,049 | 13,643 |
Actual District Growth – 2013 through 2018
- Water Service Area
- Added 309 ERUs – about 383 people, total about 600 less (6.1%) than per County forecast
- Sewer Service Area
- Added 252 ERUs – about 305 people, total about 630 less (7.0%) than per County forecast
Water Demand Forecast
Equivalent Residential Unit – DOH definition
- Actual – 103 to 125 gpd/single family customer since 2006 – Avg. 108 over past 5 years)
- Average Day Demand Forecast through year 2038
- Prior Plan – 126 gpd/ERU
- Without additional savings – 120 gpd/ERU, increasing to 135 in year 2038.
- With additional savings – 116 gpd through 2019 (WUE goal) then increasing to 125
- Maximum Day Demand Peak Factor
- Prior Plan – 2.20 times average day demand
- Current Plan – 2.19 (based on actual pattern, excluding anomaly in 2015)
Year 2038 Forecast – without additional savings
- ADD – 1.50 mgd
- MDD – 3.15 mgd3.62 mgd (Blaine Contract Maximum 3.73 mgd)
- PHD – 3,568 gpm
Water System Analysis
Standards and Criteria – District, County Coordinated Water System Plan, DOH
- Pressure at meter/service – 30 psi min. normal, 20 psi min emergency
- Fire Flow Rate and Duration – varies with land use, 0 to 2,500 gpm for up to two hours
- Water Quality – coliform monitoring, residual disinfectant, lead and copper, asbestos, TTHM, HAA5
Source
- “On paper” – Blaine Water Supply Contract – 3.73 mgd adequate for more than 20 years
- “Reality”
- constrained by Blaine and BBWSD piping, pressure and increasing demand impacts
- forecast to be deficient within 10 years
Storage
- 3,126,000 gallons in three structures, all built in 1970s
- 2004 Seismic Analysis recommended operational and structural mitigation measures
- Main zone forecast to be deficient within 10 years, Birch Point presently deficient
- Vulnerable single source of supply to Point Whitehorn area – no local storage
Transmission/Distribution System
- 82.6 miles of pipe, 2” through 18” (44% AC pipe), 535 fire hydrants, 869 valves
- Hydraulic Model Analysis – MDD, MDD + FF, PHD, every two years for 10 years, then 15 & 20 years
- Adequate for forecast demand through 2026 – then add additional supply capacity needed
Water Use Efficiency
Goals – 2019-2028
- Maintain 116 gpd ADD/ERU through 2019 and less than 120 gpd through 2008
- Meet Distribution System Leakage Standard of 10% or less
Forecast Savings
- MDD – 0.525 mgd or 192 million gallons over 10 years
- ADD – 0.275 mgd or 100 million gallons over 10 years
Measures
- Meters, Leak Detection, Conservation Pricing, School Programs
- Public Outreach, Commission Policies, Joint/Regional Programs
- Evaluate Reclaimed Water as opportunities arise
Other Elements
Operation and Maintenance Program
- Management and Certification
- Components, Operation and Preventative Maintenance
- Water Quality Monitoring – updated Coliform Monitoring Plan including E. coli response plan
- Emergency Response
- Cross Connection Control
Distribution Facilities Design and Construction Standards
- Developer Extension Process
- Design Criteria
- Standard Specifications and Details
Recommended Water System Improvements
10-year CIP: $12, 732,500
Supply
- Equip/connect/treat PW2 (Blaine project) and Portal Way BPS? Other well?
- Study options with Blaine
- Continue evaluating future supply opportunities
- Equip/connect/treat PW2 (Blaine project) and Portal Way BPS? Other well?
Storage
- Birch Point supply and storage improvements – shared Blaine storage?
- Increase Semiahmoo intertie size
- Blaine supply emergency pump connection
- Study options and develop agreement with Blaine
- Seismic evaluation and upgrades for Kickerville Reservoir
- New reservoir at Point Whitehorn with BPS modifications
- Replace Birch Point Reservoir with larger facility, with capacity for Birch Point
- Add capacity for Blaine shared storage?
- Tank recoating
- Birch Point supply and storage improvements – shared Blaine storage?
Transmission/Distribution
- Integrate Birch Point Road service area and Birch Bay View system and replace pumps
- Shared facility with Blaine to support their needs?
- Zone boundary shift/piping connection for upper Birch Bay Village pressure increase
- Water main replacement program
- Some identified projects – then general program
- Birch Point high elevation area – future BPS and closed system
- Blaine Road – Transmission main from Alderson to Church DE for redundancy
- Integrate Birch Point Road service area and Birch Bay View system and replace pumps
Other
- Complete AMR upgrades
- WSP, Financial Management Policy, Blaine contract, facilities, vehicles
Sewer Design Criteria
Wastewater Flows
- Per capita sanitary flows – 70 gallons per capita per day
- Peak factor – ratio of peak to average rate of sanitary flow = 1.8
- Reduced from prior plans based on review of flows through pump stations – general estimate
- Inflow and infiltration – values for new construction only 1,100 gallons per acre per day
Standards
- General pipeline parameters
- General pump station configuration and appurtenances
Existing Sewer System
History and Inventory
- 52 miles of gravity pipe, 9.5 miles of force main, 11 pump stations
- 1,184 manholes, nearly 3,000 side sewer stubs
- 1.44 mgd WWTP and 1.5 mile outfall
Inflow and Infiltration Analysis
- Analyzed wet and dry weather flows at WWTP
- Peak hour I/I – 1,923 gallons per acre per day
- Basin Flows Analysis – where is the I/I coming from?
- by Area – leading contributors Basins 4, 6 and 8
- by “inch-diameter-mile” including side sewer stubs and private systems – Basins 4 and 6
Hydraulic Model Analysis
- Analyzed collection and pumping system for existing and year 2038 flow conditions
- Existing conditions – Pumps 3, 4, 5, 6 & Blaine Rd and Basins 3 and 4 pipe capacity deficiencies
- Future conditions – Pumps 3, 4, 5, 6, 7 & Blaine Rd and Basins 3 through 7 pipe capacity deficiencies
Wastewater Treatment Plant
Capacity and Description
- 1.44 mgd maximum month average daily flow
- 2,500 lbs/day BOD and 2,400 lbs/day TSS maximum month loading limits
- BOD and TSS removal and disinfection requirements
- Permit renewal in process
- Summary of each major process unit
Flows and Loadings Projections – upgrade when?
- Per County Forecast
- ELU growth per County forecast – from 8,073 to 11,475 in 2038
- Maximum Month Flow in 2038 – 1.85 mgd
- Maximum Month BOD and TSS in 2038 – 2,960 and 3,290 lbs/day
- Upgrade by 2020
- Per trendlines of actual parameters for 2009-2018
- Flow – 2037, but last few years increasing faster than increase in connections
- BOD – 2038, but last few years increasing faster
- TSS – beyond 2038 – relatively flat
- (see graph next page)
- Per County Forecast
WWTP Upgrade
- Based on 2012 WWTP Engineering Report
- Remove primary clarifiers, replace with two anoxic basins and one aeration basin
- Remove one small secondary clarifier and replace with larger secondary clarifier
- To be reviewed and refined with recommended updated Engineering Report
Reclaimed Water Use
- New state standards
- General review of prior analysis and potential opportunities
Recommended Sewer System Improvements
10-year CIP: $18,035,000
Treatment
- Permitting and process/outfall evaluation
- WWTP Engineering Report
- WWTP upgrade – scheduled for 2023-2024
Pump Stations and Force Mains
- PS #8 Structure
- PS #3 and Blaine Rd Upgrade
- PS #4, 5, 6 & 7 upgrades, including force mains
Collection System – Gravity pipe
- Ongoing I/I evaluation and reduction efforts
- PS#3 to #4 Parallel 24” – north half as Phase I
- PS#4 to #5 Parallel 18” – north half as Phase I
- PS#5 to #6 Parallel 15” – north half as Phase I
- PS#6 to #7 Parallel 15” – north half as Phase I
- Shintaffer to PS#8 Parallel 12”
- Alderson Road – 12” and 15” – some by DE and some by District
Other
- PS #3 to #4 Predesign Report refinement/completion
- SCADA upgrades
- Reclaimed Water Engineering Report
- CSP, Financial Management Policy, facilities, vehicles
Next Steps
SEPA and Public Hearing
- Manager issued DNS on June 26 following review of SEPA Checklist addressing both Plans
- DNS decision notice issued June 26 to DOE, agencies and tribes, and published
- Public hearing notice published June 26
- DNS Comment Period ends July 11
- Public Hearing July 11 as part of regular meeting
- CHS presentation, Board comment/question, public comment/question, written comments
Board Direction – July 11, regular meeting
- Revise plans?
- Authorize submittal of unadopted Plans to County, City of Blaine, DOE, DOH, neighboring purveyors?
Revise and Adopt Plans
- Revise plans per agency comments
- Present to Board for adoption, including WSP supporting elements:
- Revised Retail Water Service Area (declaration, BRB NOI?)
- WUE Program
- Coliform Monitoring Program, with E. coli Response Plan
- Submit revised, adopted plans to DOE, DOH, City and County for approval
General Facilities Charges
- Evaluate water and sewer CIPs and update GFC study/calculation
- Adopt new charges following Plans adoptions
- Update Regional Connection Charge with Blaine following Blaine’s WSP adoption?