Summary for Comp Plans

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

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

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

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)

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