Robinson Noble Inc.
August 2018
1.0 Introduction and Background
The Olympic View Water & Sewer District (District) provides water to an estimated 13,000 customers within an approximately two square mile service area in southwestern Snohomish County (PACE, 2009). The District currently receives about 60% of their supply water through an intertie with the City of Seattle. The remaining 40% is derived from the District’s water treatment plant at Deer Creek Springs.
The District is also currently in the process of developing an additional groundwater source at their 228th Street wellfield. This wellfield will augment the supply from Deer Creek Springs and reduce dependency on the water purchased from Seattle. The District recently completed the construction and testing of two supply wells at the 228th Street site and is currently in the process of constructing site infrastructure. Figure 1 presents a map of the District’s service area and shows the locations of the Deer Creek Springs and 228th Street wellfield source areas.
In anticipation of bringing the new wellfield online, the District is updating their existing Wellhead Protection Program (WHPP) to include the new wellfield source and a more current assessment of the spring source. As part of the WHPP update, Robinson Noble was retained to delineate wellhead protection areas (WHPAs) for the 228th Street wellfield and to re-delineate and update the WHPAs for the spring source. This report documents the methods utilized to complete the delineation process and