Local Water Planning ExperienceMost of our local water planning work has been done for existing Class A or B water systems. We have averaged about 30 DOH or SJC Health water system related submittals per year over the last few years. Work for the larger Class A systems, 30 to 150 connections, have often included submittals that were reduced-scope Water System Plans. These planning documents, typically submitted as Engineering or Project Reports, included negotiated elements of the DOH Water System Plan outline (WAC-246-290-100). Several of the larger water system planning projects are listed below.
Rosario Water System, Orcas IslandBACKGROUND:
Rosario Resort and Water System service area needed a Water System Plan in 1995. Their service area, including purchased water, included approximately 1,500 acres on the East-central portion of Orcas Island.
8/96 - Water System Plan
8/96 - Project Report: Water Treatment Operations
- Water system planning included a metering and use tracking program that helped identify and repair system leakage, the largest of which was 30,000 gpd. The plan identified required source, treatment, storage and distribution improvements necessary for planned growth and infill.
- Treatment Plan Options: Compared capitol and annual costs of direct/convention, slow sand, precoat and ultra filtration options, recommending slow sand. Owners chose to proceed with an experimental ozonation technology which was approved under a “pilot” status and has been problematic.
Cape San Juan Water District System Updates, San Juan IslandBACKGROUND:
Cape San Juan is a groundwater supplied water system located on the South end of San Juan Island. Original planning would serve 135 lots within the district. The district wished to increase approved connections to 152 ERU’s and faced several challenges: failure of 1 of 3 wells; future saltwater intrusion concerns; failure of installed disinfection system; and unsatisfactory lead & copper results.
- Disinfection improvements: New source piping improvements including a simple flow splitting strategy to increase detention time and disinfection; Work with operator to stabilize treatment.
- Lead & Copper PH adjustments. Calculations indicated that PH could be adjusted using simple aeration additions to reservoir inlets.
- Analysis of existing well capacities and projected use, including modeled fireflows in the system indicated the existing source and storage with outlined improvements would serve additional system capacities.
Eagle Lake Water System Planning, San Juan IslandPLANNING DOCUMENTS:
99/00 - Phase 2 Distribution System As-Built Inspections
12/01 - GWI Chlorination Facilities
02/01 - Project Report Phase 3 WS Improvements
12/01 - Phase 4 Construction Drawings
Cattle Point Water System, San Juan IslandBACKGROUND:
Cattle Point Water System, located on the South end of San Juan Island, served 55 existing lots and sought approval for 60. Challenges included a 6 well well-field located within close proximity to the saltwater, with an owner-agreed maximum chloride pumping cap of 180 mg/l. (Normal is 250 mg/l). Final solution was well field approval with full desalinization replacement capacity.
8/97 - Water System Plan
8/97 - Groundwater Treatment Operators Guide
8/97 - Emergency Power
8/99 - Contractor Supplied Equipment Submittals
8/99 - Desalinization Plant Operations & Maintenance Manual
1/00 - Maintenance & Operations Manual
2/00 - Desalinization Plant Operation Guide
2/08 - Water System Analysis for ADU per DOH requirements
The desalinization plant and storage improvements were completed in 2001 and the desalinization plant was run for a one-year warranty period. Homeowners accepted the plant on 2/15/01. Following the warranty period, homeowners chose to remain on the desalinization source and not restart the well field. The plant has continued successful operations since that date.