Cultus Lake Park Sanitary Sewer Infrastructure Assessment

More documents

Recommendations

Info

Fraser Valley Regional DistrictCultus Lake Sanitary Sewer Infrastructure Assessment – Final ReportTable 4: Land UseCategory/IdentificationArea (ha)ResidentialCultus Lake, East side 12.8Cultus Lake, West side 3.3Mountain View/ Park Drive 9.5Cultus Lakeside condominiums 1.3Future Expansion 12.5Cultus lake mobile home park 12.2Commercial and InstitutionalSunnyside campground (seasonal sites) 24.7Commercial and institutional (shopping plaza, gas station,restaurant, church, fire hall, water park, etc.)10.23.3 Design FlowsDaily design flows were developed based on the existing and future population and landuse. Two sources were used to determine the design flows for the developed treatmentand pumping options (refer to Appendix A). These sources are:• City of Chilliwack “Subdivision and Land Development Bylaw 2004, No. 3055”• Sewerage System Standard Practice Manual” (SPM) ? (BC Ministry of Health2007)The design flows were developed based on the following criteria:• Ultimate population: 1622 capita• Residential and commercial area: 86.5 ha• Domestic flow rate: 410 l/c/d• Infiltration: 0.1 l/s/ha• Peaking factor: 3Table 5 provides the Design Flows that were be used for developing the describedTreatment and Pumping Options. For detailed flow calculations, refer to Appendix B.Table 5: Design Flows for the Treatment and Pumping OptionsDescriptionUnitTreatmentOptionsPumpingOptionAverage Dry Weather Flow (ADWF) m 3 /day 946 946Maximum Day Design Flow (MDD) m 3 /day 1893 ?Average Wet Weather Flow (AWWF) m 3 /day 1694 ?Peak Wet Weather Flow (PWWF) L/s 42 42Project No. 30825 – September, 2012 Page 7
Fraser Valley Regional DistrictCultus Lake Sanitary Sewer Infrastructure Assessment – Final Report3.4 Effluent LimitsExisting sewage system disposes its effluent to the subsurface ground through septictanks and disposal fields. Treatment and disposal of sewage into ground (more than,22.70 m3/day) is regulated by B.C. Ministry of Environment.The B.C. legalization which regulates sewage treatment and disposal for Cultus Lake isthe Environmental Management Act, Municipal Sewage Regulation (MSR). Theregulation identifies four treated effluent classes that can allowed to be discharged intoground. Table 6 summarizes the effluent quality for each effluent class.EffluentClassTable 6: Effluents Limits 3 Discharge to Ground) (MSR Regulation – Schedule 123 Table 1)Effluent Quality Parameters (maximum values)DescriptionBOD5(mg/L)TSS(mg/L)Fecal Coliform(#/100ml)Turbidity(NTU)Nitrogen(mg/L)A High quality secondary(drinking water wellwithin 300 m)10 10 median ? 2.2any sample ? 14average ? 2anysample ? 5B High quality secondary 10 10 400 N/A N/ANitrate?N ?10Total N ? 20C Secondary 45 45 N/A N/A N/AD Typical septic tank N/A N/A N/A N/A N/ATable notes:N/A: not applicableFor discharge into ground, the regulation requires the treated effluent to meet abovelimits and an environmental impact assessment to be conducted prior to construction ofthe treatment works. The environmental impact assessment can request a more stringenteffluent limits than the limits identified in Table 6.The existing septic tanks and disposal system follows effluent Class D. Class A, B and Crequires higher treatment than the existing treatment. The regulation requires thedischargers to ensure the following requirements:• The subsurface travel time before effluent reaches the property boundary, isintercepted by a water well or surfaces is not less than 6 days for effluent class Aor B and 10 days for effluent Class C or D• The effluent does not surface nor cause the groundwater table to be raised withina distance of 30.0 m beyond the disposal site perimeter• The discharge does not impact property owners, residents and usersCurrently, two Cultus Lake Water Park groundwater wells are located within a separationdistance less than 300 m gradient from the disposal field. These wells can becontainment with the effluent from the disposal field. ISL believes that the proximity ofthese wells to the disposal fields represents a health risk to the park patrons, and anyground water monitoring program that can be implemented will not conclude for certainthat the health risks are eliminated especially at future sanitary flow rates or atemergency situations when the chlorination system at the water park fails for any reason.Treating the sewage to high quality secondary effluent will eliminate the need forrelocating the water park wells.Project No. 30825 – September, 2012 Page 8
Page 1 and 2: Place Image over thisBlue Box Area.
Page 3 and 4: Fraser Valley Regional DistrictCult
Page 7 and 8: 42253643673804123833684253994263794
Page 11: PARKCultus LakeWestCommercial &Inst
Page 31 and 32: PLEGENDPump StationForce MainDebby
Page 37: Fraser Valley Regional DistrictCult
Page 55 and 56: B.1 Design FlowsThe design flows th
Page 57 and 58: Table B.3 provides the design flows
Page 59 and 60: Table B.6 provides the design flow
Page 62:
Dmitri Loukin / Mar. 6, 12 / T:\Pro
Page 65 and 66:
Fraser Valley Regional DistrictCult
Page 67 and 68:
D%2 Opinion of Probable Costs % Ope
Page 69 and 70:
D%4 Net Present Value AnalysisThe N
Page 71 and 72:
D.4.3 Option 4YearPopulationADD(m3/
Page 73 and 74:
4 September 2012FV12-1536-00 V.2Lev
Page 75 and 76:
ISL Engineering and Land Services L
Page 77:
ISL Engineering and Land Services L
Page 81:
Fraser Valley Regional DistrictCult
show all

Cultus Lake Park Sanitary Sewer Infrastructure Assessment

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?