Community Assessment Report - Onsite Sewage Treatment ...

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confirmed at all properties in the CAR area, with depths to seasonally saturated soil at each lotrecorded in Appendix B.For a dwelling that does not have a suitable area for an ISTS, the next ISTS would likely need tobe a holding tank because of the lack of space. Minnesota Rules, part 7080.2200 – 7080.2400(March 2011) define different ISTS system types; a brief summary of system types is given below:• Type 1: Standard systems including subsurface drain fields or mound systems onundisturbed soils with or without a pump system.• Type 2: Holding tanks (tank with a sealed outlet requiring regular pumping), privies, andsystems in floodplains.• Type 3: Systems installed on problem soils, disturbed soils, or soils where high groundwateris within one foot of the ground surface.• Type 4 and 5: Commonly referred to as “performance” systems. These systems offer a levelof pre-treatment through a mechanical treatment unit or media filter prior to discharge to adrain field or mound. Also included in this category are systems installed with higher soilloading rates or reduced vertical separation distance to groundwater.Type 1 systems meet all technical rule requirements, have adequate onsite soils, and are able tomeet setbacks. Type 2 systems are holding tanks that need visual and/or audible alarms to notifythe owner when pumping is required. The lack of an alarm on a holding tank or the neglect of ahomeowner not to pump the tank when full can cause an imminent health threat and fail toprotect groundwater. Type 2 systems also include systems in floodplains. A letter from ChisagoCounty is included in Appendix G documenting situations where holding tanks are permitted.Type 3 systems require county approval, but can be installed on sites where disturbed soils existor where a variance is required to install a system not meeting typical setbacks. Type 1 systemsthat do not meet compliance due to FTPG may be upgraded to a Type 4 or 5 system if theycurrently have at least one foot of vertical separation. Adding pretreatment allows wastewatereffluent to be discharged with a reduced vertical separation to seasonally saturated soilrequirement.T:\2797-01 Chisago County\CAR\ROLLINGS SHORES CAR 090712.docx3-4
ISTS rules dictate that systems that are not considered Type 1-3 require an operating permit. Anysystem with an operating permit typically requires annual operation and maintenance of thesystems by a licensed Service Provider 5 .Table 3 and Figure 5 summarize the most likely ISTS to be at the 14 properties, assuming ahomeowner would not install a holding tank if another option exists.Table 3: Potential ISTS Type by PropertyISTS Type Number PercentageType 1 Mound 8 57%Type 2 Holding Tank 1 7%Type 3 Mound 5 36%Type 4 Pretreatment 0 0%Type 1 and 3 systems could comprise all system types needed at upgrade. These dwellings canachieve compliance with the installation of Type 1 or 3 system with three feet of verticalseparation beneath the effluent dispersal area and the seasonally saturated condition. The Type 1and 3 systems have nominal operation and maintenance expenses of septic tank pumping onaverage once every three years and components such as pump replacement, when required. Thedifference in the Type 1 and Type 3 systems is that the Type 3 systems will require specialdesign and installation procedures; increasing their overall capital cost. Average annual operatingcosts for a Type 1 or 3 system are estimated at less than $100.One property (Car ID#13 in Appendix B, PID #03.01358.17, the Vescio property at 47256Cambridge Drive) would require a Type 2 system if the community would not allow a newcompliant mound system to be installed on the community-owned lake access lot located acrossthe road to the east or if the Bomstad’s (Car ID #11, 47190 Cambridge Drive) are not interestedin sharing a mound on the Bomstad property. Type 2 (holding tanks) can become necessary onsmall lots, lots with high groundwater, lots with setback constraints, and/or lots with multiple5 Service Provider is a license category under MN Rules Chapter 7083.0780. A Service Provider can assess, adjust,and service ISTS for proper operation.T:\2797-01 Chisago County\CAR\ROLLINGS SHORES CAR 090712.docx3-5
Page 1: Rolling ShoresCommunityAssessment R
Page 4 and 5: 1.0 Introduction1.1 BACKGROUNDThe C
Page 7 and 8: 1.3 REPORT PURPOSEThis report is a
Page 9 and 10: 2.0 Existing Conditions2.1 INTRODUC
Page 11 and 12: 2.3 FINDINGSThe purpose of the site
Page 13 and 14: Photo 1: Wastewater effluent surfac
Page 15 and 16: 3.0 Alternatives Analysis3.1 INTROD
Page 17: 3.2.2 Private ISTS ProgramIn a priv
Page 21 and 22: with CAR ID#13 is allowed to build
Page 23 and 24: Table 4: Estimated Permitting Flow
Page 25 and 26: etained at all individual propertie
Page 27 and 28: • Lower operation and maintenance
Page 29 and 30: 4.0 Cost Comparison of Alternatives
Page 31 and 32: The replacement wastewater system A
Page 33 and 34: asis, other considerations such as
Page 35 and 36: analysis over a 25-year period show
Page 37 and 38: 5.0 Summary and Recommendations5.1
Page 39 and 40: • Chisago County would continue t
Page 41 and 42: Project LocationRush Lake 7.5 Minut
Page 43 and 44: 920940920920920920940930920920920!A
Page 45: 13Note: CAR ID#13 will be a holding
Page 48 and 49: Appendix ABackground Information
Page 50 and 51: pores and channels. As a result the
Page 52 and 53: The trench is the most common of th
Page 54 and 55: DRAFT - 5/30/12Septic System Improv
Page 56 and 57: CAR ID#Property Information Drainfi
Page 58 and 59: 03.01358.15!>SB 1948.71503.01358.16
Page 60 and 61: !(03.01358.13!(!A!>SB 1939.30703.01
Page 62 and 63: !>!A03.01358.11!. !.03.01358.12!>SB
Page 64 and 65: 03.00047.1003.00047.00!(SUMP OUT925
Page 66 and 67: 03.01358.06!ACambridge Dr!>SB 1939.
Page 68 and 69:
!A03.01358.04Cambridge Dr!A03.01358
Page 70 and 71:
!(!>SB 1939.98903.01358.02!ASB 1940
Page 72 and 73:
!>03.01358.18470th St!>SB 4935.649S
Page 75 and 76:
Appendix DSoil Borings
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Date Completed:Completed By:Project
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Appendix EFlow Calculations
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LISTS Final Permitting FlowWorkshee
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MSTS Final Permitting FlowWorksheet
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ESTIMATED LISTS CLUSTER CAPITAL COS
Page 107 and 108:
ESTIMATED CLUSTER MSTS CAPITAL COST
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OPERATION AND MAINTENANCE FOR CLUST
Page 111 and 112:
Appendix GChisago County Letters
Page 113 and 114:
Compliance Inspection FormExisting
Page 115 and 116:
Property address: Cambridge Dr, Har
Page 117 and 118:
Easement and property research find
Page 119:
#210968• Signed June 27, 1988•
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