Cultus Lake Park Sanitary Sewer Infrastructure Assessment

Fraser Valley Regional DistrictCultus Lake Sanitary Sewer Infrastructure Assessment – Final Report1.0 IntroductionISL Engineering and Land Services Ltd. (ISL) was commissioned by Fraser ValleyRegional District (FVRD) to conduct an assessment of Cultus Lake Sanitary SewerInfrastructure. The purpose of study is to assess the existing infrastructure and determinethe required work to accommodate existing and future demands.1.1 BackgroundCultus Lake Park Community is located approximately 90.0 kilometers from the City ofVancouver and 11.0 kilometers south west of the City of Chilliwack. The park is locatedwithin Electoral Area “E“ within the Fraser Valley Regional District (FVRD). The park is acommunity of seasonal and full?time residences, commercial business and camp?sites(Sunnyside Campground and others). Approximately 930 people reside in the Parkthroughout the year. Cultus Lake is a tourist destination and in a summer season, it canattract more than one million visitors for daily?use and overnight camping.Cultus Lake is served by a sewage collection and treatment system. Septic tanks anddisposal fields are used for treatment. The system was constructed in 1970 andupgraded in 1979, and it is operated by the Cultus Lake Park Board (CLPB). The existingsystem is mainly comprised of the East and West Systems with authorized capacities of360 m3/day and 90 m3/day respectively. In addition to these systems, individual septictanks and disposal fields are used to serve different areas within Cultus Lake ParkCommunity.1.2 Scope of WorkISL’s scope of work on this study is summarized below:• Assess the existing infrastructure and determine the required work toaccommodate the existing and future demand.• Develop Treatment/Transferring Options to accommodate the existing and futureflow rates. The Options that will be investigated are as follows:o Option 1: expand the existing system to accommodate the design flowrate using the same treatment scheme (i.e. septic tanks).o Option 2: provide secondary treatment option to comply with Class?Ceffluent according to the Municipal Sewage Regulation (MSR)o Option 3: provide high quality secondary treatment to comply with Class?oA effluent according to the Municipal Sewage Regulation (MSR)Option 4: abandon existing disposal field and send the wastewater to theCity of Chilliwack sewer system.• Prepare conceptual capital cost estimates, yearly operation and maintenancecosts (O&M), and net present value (NPV) for all options.• Evaluate all the Options based on the advantages, disadvantages, costestimates and NPV and recommend the Ultimate Option for implementation• Prepare engineering report that consolidates the findings of the study into acomprehensive document.The scope of work also includes preparing engineering drawings for a pump station andodor control package, the drawings is not part of this report.Project No. 30825 – September, 2012 Page 1