Cultus Lake Park Sanitary Sewer Infrastructure Assessment

Fraser Valley Regional DistrictCultus Lake Sanitary Sewer Infrastructure Assessment – Final Report2.2 Existing FlowsCultus Lake Park Board (CLPB) monitors the actual flow to the east and west field usinga flow meters installed within SL1 and SL4 respectively. The CLPB monitors the dailyflows on a weekly basis; the weekly reading is recorded and divided by seven days toobtain the daily flows based on weekly basis. Table 2 provides the recorded daily flowsbased on a weekly basis.Table 2: Historical Maximum Daily FlowEast and West Fields (based on weekly measurements)East FieldWest FieldYearMaximum l/c/d Maximum l/c/dDaily FlowDaily Flowm3/daym3/day2003 272.9 448.1 N/A N/A2004 209.1 343.3 N/A N/A2005 179.5 294.7 N/A N/A2006 256.1 420.5 N/A N/A2007 171.2 281.1 N/A N/A2008 117.0 192.1 131 801.92009 86.6 142.2 76 466.32010 77.5 127.3 71.5 438.7The flows based on liter/capita/day (l/c/d) varied considerably between the years andbetween the East and West field readings. As per Table 2, the flow dropped considerablyfrom 2008 to 2010 and it may be due to flow meter malfunction as indicated in the Daytonand Knight Consulting Engineers Report, “Fraser Valley Regional District, Cultus LakeSewer Assessment, 2010”. The daily data from January 2011 to October 2011 wereavailable to ISL for review. The data still shows a considerable drop in the daily flowsespecially for the East Field.The collected data is also based on a weekly basis which may not represent the actualmaximum daily flow; especially that Cultus Lake may experience high residents duringweekends.The historical data is based on the maximum days which usually in summer. Thegenerated sewage flows, especially the area contributing to the East field, is consideredlow in terms of (l/c/d) compared with other communities. The low sewage flow (l/c/d) canbe attributed to either a high un?occupied dwellings or faulty flow meter.2.3 Ministry of Environment (MoE) PermitIn February 2011, the Ministry of Environment issued Permit # 5526 to the Fraser ValleyRegional District which identifies certain requirements that have to be met for the sanitarysystem including submitting a written report for Maintenance and Repairs. The permitalso sets the maximum authorized discharge rate to the east and west disposal fields at360 m3/day and 90 m3/day respectively.Project No. 30825 – September, 2012 Page 4