Community Engineering Corps®: Two Case Studies from the ...€¦ · Three Case Studies from the...
Transcript of Community Engineering Corps®: Two Case Studies from the ...€¦ · Three Case Studies from the...
Joanie Stultz, Brown and Caldwell John Roth, Clark PUD Patrick Weber, Brown and Caldwell
Community Engineering Corps®: Three Case Studies from
the Pacific Northwest Section May 4th, 2017
PNWS Conference, Kennewick, WA
The Alliance
Alliance Mission Bringing communities and engineering
leaders together to advance local infrastructure solutions
Alliance Vision A country in which underserved
communities have access to the technical expertise required to ensure the
infrastructure capacity to meet their needs
Leadership
Region 1
Mark Tompeck, NJ
Maria Carbo, Chesapeake
TBD, MD
Region 2
Sandy Smith, GA
Pam Moss, NC
Alan Cranford, KY/TN
Region 3
Tim Wilson, IA
Jon Eaton, MN
Del DeBoer (invited),
ND/SD
Region 4
Scott Paxman, Intermountain
Charlie Anderson, TX
TBD, Rocky Mountain
Tom Wolf, AK
Phil Holderness,
CA/NV
Lynn Williams Stephens, Pacific NW
Legend: Total Water Solutions project TWS project, AWWA team Other
2015-2017 AWWA Water Projects Project Name Project Type Community State
Project Team Name Phase
Elementary School Water Supply Olympia Area Washington Pacific Northwest
Section 2015-2016
Elementary School Water Supply Greater Vancouver Washington Pacific Northwest
Section 2016- Present (Monitoring)
Water Users Association Water Supply Olympic Peninsula Washington Pacific Northwest
Section 2017 (Just started)
• 28 projects in total for CEC • 7 Sponsored by AWWA to date
The Community and the Team
• Communities can apply either with or without an affiliated project team
• Communities without a team are matched according to team’s expertise
• Team needs to fit the community’s needs - and engage the community
The Process Community Applies for Project
Assemble Project Team
Scope of Work and Contract
Project Reports and Deliverables
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Greater Olympia Elementary School
Joanie Stultz
Overview •Background and Motivation •Project Team •Water System History (Pilot Testing) •Existing System •CEC Project:
– Design Objectives – Alternatives Evaluation – Recommendations
Background and Motivation
•Rural area •Single well serves 250 elementary students (1,900 gpd)
•Arsenic, iron, manganese, and taste and odor issues
•High levels of TOC
Project Team
Project Team: • Project lead
• Bob Wubbena, Retired Engineer, past AWWA President • Technical lead, responsible engineer –
– Lynn Stephens, Brown and Caldwell • Worked with St. Martins University EWB Chapter
Water System History •Pilot study in 2008
•Membrane filtration followed by GAC •Potassium permanganate as oxidant •Ferric sulfate as coagulant upstream of filters •Approved for full-scale implementation
•Pilot Study in 2015 •Greensand upstream of GAC for Arsenic removal
Existing System • GAC filters > sodium hypochlorite (oxidant) and ferric chloride (coagulant) > cartridge
filters (membrane filtration) > storage
GAC Filters (4)
NaOCl Feed Tank
FeCl3 Feed Tank
Contact Tank
Cartridge Filters
(2)
Storage Tanks (2)
NaOCl Feed Tank
Existing Water Quality • Elevated levels of Arsenic, manganese and iron • Soft water, slightly corrosive with elevated Cu levels • pH 8.0
Table 1. Raw Water Quality Summary
Parameter Number of Samples
Range (mg/L)
Average (mg/L)
Primary or Secondary
MCL (mg/L)
TOC 4 1 - 10.6 4.8
Arsenic 27 0.006 - 0.03 0.011 0.01
Iron 10 0.06 - 0.5 0.09 0.3
Manganese 18 0.05 - 0.08 0.06 0.05
Design Objectives • Improve treatment
– Arsenic (primary contaminant) – Manganese (secondary contaminant) – Iron (secondary contaminant) – Organics (tastes and odors, and disinfection by-product precursors)
• Improve operation and maintenance – Automated filter cleaning or reduce need for weekly filter replacement
Alternatives Evaluation
•Develop a new well supply X • Install new membranes X • Install ion exchange X • Install a biological filter X • Install a greensand filter system
– Proven technology – Successful pilot study – 5 year media life
Recommendations • Replace one cartridge filter with greensand filter • Automate backwashing of GAC and greensand filter • Develop an O&M plan (still needed to be completed)
W e ll P u m pR A W W A T E RG A C
C o n ta c to r 1
P IL O T S T U D Y E F F L U E N T W A T E R
G re e n s a n dF ilte r
S o d iu m H y p o c h lo r iteS o lu t io n T a n k
S o d iu m H y p o c h lo r iteF e e d P u m p
F e rr ic C h lo r id eS o lu t io n T a n k
F e rr ic C h lo r id eF e e d P u m p
G A CC o n ta c to r 2
G A CC o n ta c to r 3
G AC o n ta c to r 4
C a r tr id g e F ilte r
Where are we?
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John Roth
Greater Vancouver Elementary School
Elementary School in Greater Vancouver Area
Sampling Plan
Sampling: (2) 250 ml samples of first draw (2) 250 ml samples second round
Chloride Calcium Sulfate Iron Manganese Lead Copper
Chlorine residual (field test) Total Chlorine (field test) pH (field test & lab) Alkalinity (measured as calcium carbonate) Temperature (field test) Total dissolved solids (TDS) Hardness Conductivity
Staff room (background) Library/Art (3 hits at or above 10 ppb) Kitchen (1 hit at or above 10 ppb)* K & 1 Classroom (background) 2 & 3 Classroom (1 hit at or above 10 ppb) 4 & 5 Classroom (1 hit at or above 10 ppb) *Note: the kitchen had only been sampled once according to records
Project Team: • Project lead – John Roth, Clark PUD • Engineer of Record – Lynn Williams Stephens, BC • Mentor – Bob Wubbena • Independent Review Panelists
– Mike Whiteley, City of Gresham – Patrick Craney, City of Vancouver – Bill Persich, BC – Melinda Friedman, Confluence
Elementary School in Greater Vancouver Area
Elementary School in Greater Vancouver Area
• Recommendations – Record daily system flushing – Comprehensive program to replace unknown
fixtures with lead-free versions – Treatment improvement of aeration to raise
pH
Where are we?
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Olympic Peninsula Small Water System
Assistance
Patrick Weber
Olympic Peninsula
Community
• Small Water Users Association • Mix of full time and vacation homes; two
inns • 22 homes, 8 full-time residents • Limited funding available
Challenge/Need
• Red operating permit • Unfiltered GWI source • Reduction in operating costs • Long-term water planning services to build
capacity • Access to professional services
– Long project history
Existing Water System
Existing Water System
Creek behind well house New well head
Planned Improvements
• Connect new well to system – Want to be a groundwater system
• Electrical supply from existing well house • Connect to well house treatment (TBD) • Practical and cost-effective
Scope of Work
• Source Approval report for new well • Water system improvements:
• Basis of design report • Construction documents
• Construction completion report – (construction planned early 2018)
• Small Water System Management Plan
CEC Project Team Project Lead: Jester Purtteman (Previously DOH) Technical Lead, Responsible Engineer in Charge: Jim Konigsfeld (Sammamish Plateau Water) Technical Team:
• Patrick Weber, PE (BC) • Kirsten Wood, PE (BC) • Joanie Stultz, EIT (BC) • Beth Mende, EIT (HDR)
Independent Review Panel: • Kyle Wong, Sammamish Plateau Water • Patrick Van Duser, Black & Veitch • Bob Wubbena, retired
UW Student Team
Joanie Stultz
Ways To Get Involved
More Information • Friday, 12:00 – 1:00, Room D CEC Meeting • June CECorps Lunch-Box Talk (1 PDH)
• Thursday June 8, 2017 online
• ACE 2017 In person Training (1 PDH) • Monday June 12th, 2017 at AWWA’s Annual
Conference and Exposition.
Contact Us CECorps PNWS-AWWA Liaison
– Lynn Williams Stephens, Brown and Caldwell (BC) [email protected]
Speakers: John Roth, Clark PUD [email protected] Joanie Stultz, BC [email protected] Patrick Weber, BC [email protected]
http://www.communityengineeringcorps.org/