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Home My WebLink About2021-09-27 PACKET 06.1.STAFF REPORT CASE: V2021-046 ITEM: 6.1 PUBLIC MEETING DATE: 9/27/21 TENTATIVE COUNCIL REVIEW DATE: 10/20/21 APPLICATION APPLICANT: Titan Property Ventures, LLC REQUEST: A variance to setback requirements for a subsurface sewage treatment system to allow a septic system at 8401 River Acres Road South to be closer than 150 feet from the normal high-water mark within the Mississippi River Corridor Critical Area. SITE DATA LOCATION: ZONING: GUIDED LAND USE: 8401 River Acres Road South R-4, Low Density Residential Low Density Residential LAND USE OF ADJACENT PROPERTIES: CURRENT GUIDED NORTH: Rural Residential Low Density Res. EAST: Rural Residential Trans Planning Area SOUTH: Mississippi River Mississippi River WEST: Rural Residential Low Density Res. SIZE: N/A DENSITY: N/A RECOMMENDATION Approval, based on the findings of fact and subject to the conditions stipulated in this staff report. Cottage Grove COTTAGE GROVE PLANNING DIVISION � here Pride and Prosperity Meet Planning Staff Contact: Mike Mrosla, Senior Planner; 651-458-2825; mmrosla(c-)_cottagegrovemn.gov Application Accepted:. 9/15/2021 60-Day Review Deadline: 11/14/2021 City of Cottage Grove Planning Division • 12800 Ravine Parkway South • Cottage Grove, MN 55016 Planning Staff Report 8401 River Acres Road — OHWL Setback Variance Planning Case No. V21-068 September 27, 2021 Proposal Titan Property Ventures, LLC has submitted an application for a variance at 8401 River Acres Road South. The Applicant is requesting a variance to replace an existing wastewater disposal system. The proposed variance is required to meet the minimum setback of 150 feet for septic infrastructure within the Mississippi River Corridor Critical Area (MRCCA). Location map Review Process Application Received: September 14, 2021 Acceptance of Completed Application: September 15, 2021 Planning Commission Date: September 27, 2021 Tentative City Council Date: October 20, 2021 60-Day Review Deadline: November 14, 2021 Planning Staff Report — 8401 River Acres Road Septic Setback Variance Planning Case V2021-068 September 27, 2021 Page 2 of 6 Property Characteristics The subject parcel is uniquely shaped and is located adjacent to the Mississippi River, south of River Acres Road and the railroad tracks. The majority of the site is wooded with a gradual slope towards the river with no steep slopes or bluffs. d#� �, =' � JM'�` iF •= �� ,err' �1. ��'` '.� �i { is ,1�'• i. �,r.. yn . f . l r W 0 n 'w AUAn,j ,pp)o Existing Site Previous Approvals At its July 21, 2021, meeting the City Council approved a variance allowing the Applicant to construct an addition to the existing principal structure. As previously mentioned, the subject parcel is uniquely shaped and because of that it restricts the buildability on the lot. The ap- proved variance permitted the Applicant to construct an addition at the same setback as the principal structure to the Ordinary High -Water Level (OWHL), which is 65 feet. Planning Considerations Ordinance Requirements The property is zoned R-4, Low Density Residential District, and is within the MRCCA overlay dis- trict. The current MRCCA ordinance requires "all parts of an on -site sewage disposal system shall be located at least one hundred fifty feet (150') from the ordinary high-water mark level and from bluff lines" (City Code Title 11-15-8-F2). The subject parcel at its widest is approximately 175 feet and the existing drainage field meets the setback standards. Planning Staff Report — 8401 River Acres Road Septic Setback Variance Planning Case V2021-068 September 27, 2021 Page 3 of 6 Parcel Width Exhibit Variance — Setback The proposed replacement wastewater dispersal system will need to be in a different location than the existing field onsite. Due to the site constraints, the Applicant is requesting a variance to locate the proposed wastewater dispersal system 75 feet (Attachment A) from the OHWL (688 feet) of the Mississippi River instead of the 150 feet required by ordinance. The proposed location is located outside of the 100-year floodplain (Attachment B). R i L OFF a -r-cL "I" " Max A�y.- �.� � � � � T+ AfC s �. �• fpbo_sr Q�E55,UP` BED *4 l I p¢At9�Fto I000 IS�� 3�1►f �l ` '�'Ia � �.. fy •��- pRRLY ABANDON EX'j TnNGNNUSED DRYWEUS, DPE gDLS, SEF71C faW1G4 �ND DRAtlBt?Ki ng *e ' g z (- 1r r G fi IZRCSE WELL-7, rl ��R.byC �r_tt517 y 4 Li 4� � ABANDoA7�pA+vi3 pLAVN "e t 1 � l�Epi f►c� U w rtt C"ON WELLS ON ALLINIIEf 00"79AWIF S.DR ES & TRENCHES MOUNM Benchmark lda9ci 0.1 thmitin t le rr 66^ 914A) Hae GR�MN-YA SSBLE CLEAN-OLrr7t 99.9 MAX 10a' SPACING REO WELLS 8fRESSUR- I,+ilim;tinl;la.er66'93.6] B-3 lamer 66' 9a.7] "' l SLDG8FhTLS-UK20'FROMGF' eVF� IM2 HOLDING R �� vim aimiiing B-4d,iv1in;,.—r1;1, 1,r: TESTED WA W DRANHELD, v'G, nu.3 i'"TAWS-MIN 50'FROM WELLS SP4 993 SP-2 Appmx ;lmdc a1 new tank Appmx mkl nl' I+t -P,i tame 99.8 99.0 96.6 Appmx nndnt nt2nd lank ARpmx pu mp ck adoa Z 91.Q MI---s PP i {�I VL rL head Feel ofPrO k;kr at haam us tl:Sr`d 6.S 97.1 t imitin laver'a B-1 94,R SEPARATION = 3,0 - 1�- Site Plan In 2017 the DNR updated the MRCCA ordinance and provided draft language to cities along the Mississippi River Critical Corridor Area. The MRCCA rules were established to protect the Corridor's natural, cultural, and scenic resources. As part of the City's adopted 2040 Compre- Planning Staff Report — 8401 River Acres Road Septic Setback Variance Planning Case V2021-068 September 27, 2021 Page 4 of 6 hensive Plan, the City is required to adopt the new ordinance. The City is planning to adopt the new ordinance by the end of 2021. The subject parcel is located within the newly created River Neighborhood (RN) District. The intent of this district is to maintain and manage existing resi- dential neighborhoods visible from the river. The new standards allow for subsurface sewage treatment systems, including the septic tank and absorption area, to be located a minimum of 75 feet from the OHWL of the Mississippi River and all other public waters. MRCCA Districts CA -River Neighborhood (RN) CA -Rural Open Space (ROS) ■ CA•River Town Crossings (RTC) CA -Separated From River (SR) CA -Urban Care (UC) CA -Urban Mixed (UM) MRCCA District DNR Review The plans were submitted to the Minnesota DNR on September 21, 2021. The DNR notified staff on September 22, 2021 that they found the submitted plans consistent with the MRCCA standards and had no additional comments. Public Hearing Notice The public hearing notice was mailed to 17 properties within 500 feet of the subject property and published in the St Paul Pioneer Press on September 17, 2021. Variance Requests With all variance requests, the Planning Commission and City Council must look to the zoning ordinance for guidance and direction. City Code Title 11-2-7: Variances Sections A and D states that: A. Authority And Purpose: The council may grant variances from the strict application of the pro- visions of this title and impose conditions and safeguards in the variances so granted in cases where there are practical difficulties or particular hardships in the way of carrying out the strict letter of the regulations of this title. D. Consideration By Planning Commission; Recommendation: Before authorization of any vari- ances, the request therefor shall be referred to the planning commission, and for its recom- Planning Staff Report — 8401 River Acres Road Septic Setback Variance Planning Case V2021-068 September 27, 2021 Page 5 of 6 mendation to the city council for the granting of such variance from the strict application of the provisions of this title so as to relieve such practical difficulties to the degree considered rea- sonable without impairing the intent and purpose of this title and the comprehensive plan. The planning commission shall recommend such conditions related to the variance, regarding the location, character and other features of the proposed building, structure or use, as it may deem advisable. The planning commission shall make its recommendation within sixty (60) days after the request is referred to it, unless the applicant requests, in writing, that an exten- sion of time for review be granted by the planning commission. The planning commission may recommend a variance from the strict application of the provi- sion of this title, if they find that: 1. The variance is in harmony with the purposes and intent of this title. 2. The variance is consistent with the comprehensive plan. 3. The proposal puts the property to a reasonable use. 4. There are unique circumstances to the property not created by the landowner. 5. That the conditions upon which an application for a variance is based are unique to the parcel of land for which the variance is sought and are not applicable, generally, to other property within the same zoning classification. 6. That the purpose of the variance is not based exclusively upon a financial hardship. 7. That the granting of the variance will not be detrimental to the public welfare or injurious to other land or improvements in the neighborhood in which the parcel of land is located. 8. That the proposed variance will not impair an adequate supply of light and air to adjacent property, or substantially increase the congestion of the public streets, or increase the danger of fire, or endanger the public safety. In addition, the existing MRCCA ordinance within the City Code allows for a variance review per City Code Title 11-15-16B(2): When considering a proposal for a variance or other applications within the Mississippi River Corridor Critical Area, the Planning Commission and City Council shall address the following items in making their decision: a. Preserving the scenic and recreational resources of the river corridor, especially in regard to the view from and use of the river. b. The maintenance of safe and healthful conditions. c. The prevention and control of water pollution, including sedimentation. d. The location of the site with respect to floodways, flood plains, slopes and bluff lines. e. The erosion potential of the site based on degree and direction of slope, soil type and vegetative cover. f. Potential impact on game and fish habitat. g. Location of the site with respect to existing or future access roads. h. The amount of wastes to be generated and the adequacy of the proposed disposal systems. i. The anticipated demand for police, fire, medical and school services and facilities. f The compatibility of the proposed development with uses on adjacent land. Planning Staff Report — 8401 River Acres Road Septic Setback Variance Planning Case V2021-068 September 27, 2021 Page 6 of 6 Findings The findings of fact for a favorable recommendation of the location variance request are as follows: A. Ordinance allows on -site sewage disposal when public or municipal facilities are not available. The disposal system is allowed outside of floodplain areas. B. The applicant is proposing to utilize the property in a reasonable manner by constructing a septic tank and drain field within a single-family residential property. C. There is an existing legal non -conforming principal structure on the site. D. Due to site constraints not created by the property owner, the site does not have the needed lot depth to conform to the existing setback requirements. E. The ordinance is in the process of being amended to allow for subsurface sewage treatment systems, including the septic tank pressure bed and absorption area, to be located a minimum of 75 feet from the OHWL of the Mississippi River and all other public waters. Recommendation Based on the findings of fact, staff recommends that the Planning Commission approve the var- iance to allow an additional septic tank and pressure bed to be setback 75 feet from the ordinary high water level (OHWL) at 8401 River Acres Road South, subject to the following conditions: 1. An erosion control plan and grading plan must be submitted and approved by the City Engineer. 2. The approved septic tanks shall be measured from an elevation of 688.8 feet (the ordi- nary high-water level confirmed by DNR). 3. The septic system shall comply with all Washington County codes, and all required in- spections and approvals should be conducted. 4. The treatment and dispersal processes must prevent sewage or sewage effluent contact with humans, insects, or vermin and must be in a safe manner that adequately protects from physical injury or harm. 5. The soil treatment and disposal system may not be located within the floodplain. Prepared by: Mike Mrosla Senior Planner Attachments: Septic Designs Plan FEMA Floodplain Map ALL STATE SEPTIC SERVICES, LLC 12155 Norell Ave N Stillwater, MN 55082 Office 651-439-7323 Cell 612-594-4496 Septic System Design For: 8401 River Acres Rd S Cottage Grove, MN 55016 April 4, 2021 • Pressure Bed Septic System Spec Sheet • Site plan • Fema Flood Map • Design Summary • Preliminary Evaluation Worksheet • Field Evaluation Worksheet • Bed Design Worksheet • Table IX, Loading Rates • Pressure Distribution Worksheet • Pump Tank Worksheet • Minnesota Precast Tank Specs • Basic Pump Selection Worksheet • Goulds Water Technology Pump Specs • Soil Observation Logs • Web Soil Survey, Map Unit Description • Web Soil Surveys, Soil Map • Washington County/DNR; Waterbody Classification • Washington County Shoreland Structure and Sewer Setback. • SSTS Abandonment Reporting Form • Polylok Effluent Filter Specs • Management Plan Pressure Bed Septic System Specifications 8401 River Acres Rd S Cottage Grove, MN 55016 PID 33.027.21.24.0036 April 4, 2021 General: 1. This plan is designed to replace the existing system. 2. A separate installation permit is required from Washington County. 3. This design is subject to review, approval and inspections as required by the County. 4. This is not a survey; a survey may be required to verify the property lines and setbacks. 5. The benchmark is 100.0 at the deck. 6. The drainfield area should be protected from traffic with a fence or other type of barrier. 7. All elevations and dimensions are subject to contractor verification. 8. The property owner must disclose all wells within 100 feet. 9. Call Gopher State One Call to locate existing utilities before digging. 10. Contractor shall coordinate access to the property and restoration with the owner. Tanks: 1. Examine the existing sewer line. Replace or repair as needed. 2. Pump, disconnect and abandon the existing tank and drainfield. 3. Install 1500 gallon and a 1000 gallon septic: tanks with risers, manhole covers, insulation and an effluent filter with visual and audible alarms. 4. Install a 1000 gallon pump tank with risers, manhole cover insulation to meet code. 5. In the pump tank, install a Goulds WE31 effluent: pump (or equivalent). 6. Tank locations can vary to save trees, etc. Tanks must meet the following setbacks: • 75' from the OHWL of the Mississippi River • 10' from occupied structures. • 10' from property lines. • 10' from buried water supply lines under pressure. • 50' from deep wells, 100' from shallow well. 7. Because this is an existing house, the new tank can exceed the 4' max depth limit to maintain gravity. Pressure Bed Drainfield: 1. Install a 2" pump line from the pump tank to the new drainfield as shown on the site plan. 2. Install a 16 X 37.5 pressure bed drainfield with 6" rock as shown on the site plan. The bottom of the pressure bed will be max 30" deep at -the NE corner. 3. Install 5 1.5"laterals, 35.5' long, 3' OC with 3/16 perfs 3' OC 4. Install cleanouts at the end of each lateral. 5. Backfill and cover with topsoil and crown to allow for settling. 6. Complete grading as needed to divert runoff. N AN sb%m$ 6 and d1mef1eM 4M wbied 1D contactor varMcafto L:t N 6 arc. pcCt ass -� pWERLY ABANDON E) t MNMNUSED DRYWELLS, rAMMIA& SEPTIC TANIirS MID DRAINFIEI� Benchmark (deck) 100.0 B-1 (limiting layer 66" 94.4) 99.9 B-2 (limiting layer 66" 93.6) 99.1 B-3 (limiting layer 66" 94.7) 100.2 B-4 (limiting layer 66" 94.8) 100.3 SP-1 99.3 SP-2 99.8 Approx grade at new tanks 99.0 Approx inlet of 1st septic tank 96.0 Approx outlet of 2nd tank 95.0 Approx pump elevation 91.0 Feet of head 6.8 Elev at bottom of rockbed 97.8 Highest limiting laver (a, B-4 _94.8 ENot Rkveft- At-2es P05 Cam-/+r=E cz aQVC, /tit,V 6sa t= p-I , This is not a survey. This design is subject to review, approval and inspections as required by the local permit official or governmental agency. �0' 710 37 dfl its pR E s!s 6 ED 2-S, �Pz- 1O L 3 oro sP' proposed offiInfiew ars Wei s V130]0-b 1 f82 l-Fo Q Of MOMS R u�'RAC E� . V4M CC PPR.ox FL-c�o `IV P L�} t N L � N � A 13ANOc�C0 ANo REP' - A<c- p tau ort-1 P"DE WSPECTM WEt1 S ON ALL INLET a e-zT�'( W v4 i�rt OURa BAFFLM DROP IBOXEIS & TRENCHES ORM"O4' AEAD&YACCESSISLEMEAN-OUT BLDG SEYI MS- MIN20' FROM WELLS & PR SSURE' MAX 1OO. SPACING REQ pVVEEy TESTED WA W DRAINFIELD, SEPT;C, HOLDING & AMATANQ PUMP TANKS -MIN W FROM WELLS WA fZ,` AWL o� Mi5stippl:5.5 7 RIvez SEPARATION = 3.0 FEMAI!/ww�fema.gov . FEMA Flood Map Service Center: Search By Address Navigation Enter an address, place, or coordinates: £:. 8401 river acres rd s cottage grove mn Search Search Whether you are in a high risk zone or not, you may need flood insi trance thttns://www fema goy/national-flood-insi iranre-Qro ram) because most homeowners Insurance doesn't cover flood damage. If you live in an area with low or moderate flood risk, you are 5 times more likely to experience flood than a fire in your home over the next 30 years. For many, a National Flood Insurance Program's flood insurance policy could cost less than Languages $400 per year. Call your insurance agent today and protect what you've built. Learn more about ss;; e"you can take fhtrosl/www.fema goWwhat-mitigation) to reduce flood risk damage. MSC Home (/portal/) MSCSearch byAddress (/portal/search) rResults—Products for COTTAGE GROVE Search , Show ALL Products n (https:i/msc.fema.gov/portal/avaiiabiiitySearch?adcic( MSCSearch All Products CITY OF Vportal/advanceSearch) MSC Products and Tools (/portal/resources/productsandtools) The flood map for the selected area is number 2716341 effective on 02/03/2010 0 HazusVportaVresources/hazus) DYNAMIC MAP MAP IMAGE Changes to this FIRM A LOW Batch Files (/portaVresources/lamc) Revisions (0) Q z Amendments (0) Product Availability DOWNLOAD Revalidations (0) (/pf}MAPANEL ortal/prcductAvailabiliry) PRR�. (httQsWmsc.fema.gov/ octal/downloadProduct? MSC Frequently Asked Questions fleoath=/27/P/Firm/27163CO416E.onP&orodUCtTVDeID=FINAL PRODUCT&oroductSubTvoeID=FIRM PANEL&oroductlD=27163C0416E)• Vportal/resources/faq) - MSC Email Subscriptions Vportal/subscriptionHome) You can choose a new flood map or move the location pin by selecting a different location on the locatormao below or by entering a Go To NFHL Viewer » (https:Hhazards-fema.maps.arcgis.com!Ann sI eba Contact MSC Help new location in the search field above it may take a minute or more during peak hours to generate a dynamic FIRMette. I you are a (/portal/resources/contact) person with a disability, are blind, or have low vision, and need assistance, please contact a map specialist (https//msc. fema.gov/portal/resourcevtontoct). Q" I ni Fil C—ii Design Summary Page m C N CONTROL A POLLUTION CONTROL AGENCY 1. PROJECT INFORMATION v 04.01.2020 Property Owner/Client: Jason Gamache Project ID: Site Address; 8401 River Acres RdS, Cottage Grove, MN 55016 Date: 04/04/2� Email Address: iasonCa�incentiverealt my n.coin Phone: 612-804-8132 2. DESIGN FLOW Et WASTE STRENGTH Attach data/estirnatebasnforOtherEstabihhments Design Flow: 600 ]GPD Anticipated Waste Type: Residential BOD: <170 ]mg/L TSS: <60 mg/L Oil Et Grease: <25 mg/L Treatment Level:I (.]SeiectTreatmentLeveiCforresidentiaiseptictankeffluent 3. HOLDING TANK SIZING Minimum Capacity: Residential =400 gal/bedroom, Other Establishment = Design Flow x 5.0, Minimum size 1000 gallons Code Minimum Holding Tank Capacity: ]Gallons in Tanks or Compartments Recommended Holding Tank Capacity: ]Gallons in Tanks or Compartments Type of High Level Alarm: (Set 9 75% tank capacity) Comments: 4. SEPTIC TANK SIZING A. B. ............. Residential dwellings: Number of Bedrooms (Residential): �] Code Minimum Septic Tank Capacity: 2500 ]Gallons inTanks or Compartments Recommended Septic Tank Capacity: 2500 ]Gallons in Tanks or Compartments Effluent Screen Ft Alarm (YIN): Yes ] Model/Type: PL625 ............. ............................................... ............................................ ......................................... ..................................................................................................... ..:.......:::.:: Other Establishments: Waste received by: GPD x ®Days Hyd. Retention Time Code Minimum Septic Tank Capacity: C]Gallons In Tanks or Compartments Recommended Septic Tank Capacity: ]Gallons In Tanks or Compartments Effluent Screen Ft Alarm (YIN): ] Model/Type: ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,; PUMP TANK SIZING Pump Tank 1 Capacity (Minimum): 600 ]Gal Pump Tank 1 Capacity (Recommended): 1000 ]Gal Pump 1 25.0 GPM Total Head 13.9 ]ft Supply Pipe Dia. 2.00 in Dose Vol: 58.0 ]gal Pump Tank 2 Capacity (Minimum): Gal Pump Tank 2 Capacity (Recommended): ]Gal Pump 2GPM Total Head 1ft Supply Pipe Dia. = Dose Vol: =Gal t �4- Design Sumimary Page AMINNESOTA OLLUTION CONTROL AGENCY 6. SYSTEM AND DISTRIBUTION TYPE Project ID: Soil Treatment Type: Bed Distribution Type: Pressure Distribution -Level Elevation Benchmark: 100 ft Benchmark Location: deck MPCA System Type: Type I Distribution Media: Rock Type III/IV Details: F-7— _� 7. SITE EVALUATION SU f RY: .................................................................................................................................................................................................................................................................................... Describe Limiting Condition: Depth of Observation Layers with >35% Rock Fragments? (yes/no) FT01 If yes, describe below: % rock and layer thickness, amount of soil credit and any additional information for addressing the rock fragments in this design. Note: Depth Depth Limiting Condition: 66 inches 5.57''ft Elevation of Limiting Condition 94.80 ft Minimum Req'd Separation: 36 inches 3.0 ft 01tica/for system comp/fiance Elevation Code Max System Depth: 30 inches C] ft 97.80 ft This is the maximim um depth to the bottom of the distribution media for re4uirecl seFaration. Negative Depth Sft� means it m ust be a mound: Soil Texture: F Loamy Sand Soil Hyd. Loading Rate: 1.00 GPD/ft2 Percolation Rate: .1-5 MID Contour Loading Rate: 12 Note:l_ Measured Land Slope: 3.0 % Note:l_ Comments 8. SOIL TREATMENT AREA DESIGN SUMMARY Trench: � Dispersal Areaft2 Sidewal.l Depth in Trench Widthft Total Lineal Feetft No. of Trenches Code Max. Trench Depthin Contour Loading Rateft Lengthl_ ft Designed Trench Depth=in Bed: Dispersal Area 600 ft2 Sidewal.l Depth in Maximum Bed Depth 30.0 in Bed Width 16 ft Bed Length I_ 37.5 ft Designed Bed Depth 30.0 in Mound: Dispersal Areaft2 Bed Length ft Bed Widthft Absorption Width ft Clean Sand Lift ft Berm Width (0-1%) ft Upslope Berm Widthft Downslope Berm ft Endslope Berm Widthft Total System Lengthft System Width I_=ft Contour Loading Rate=gal/ft Project ID: At -Grade. Design Slamimiary Page MINNESOTA POLLUTION CONTROL AGENCY Bed WidthC �ft Bed Length�ft Finished Height]ft Contour Loading Rate[—gal/ft Upslope Bermft Downslope Berm]ft Endslope Berm�ft System LengthE=ft System Width]ft Level Et Equal Pressure Distribution No. of Laterals[ 5 Perforation Spacing ft Perforation Diameter 3/16 in Lateral Diameter[ 1.50::]in Min Dose Volume E 78 gal Max Dose Volume 150 ]gal Non -Level and Lateral 1 Lateral 2 Lateral 3 Lateral 4 Lateral 5 Lateral 6 Unequal Pressure Distribution Minimum Dose Volume �l gal Maximum Dose Volume �l gal Elevation (ft) Pipe Size (�n) Pipe (gal/ft) Volume Piper LengthF'erf (ft) Size (in) Spacing (ft) Spacing (in) 1 9. Additional Info for At -Risk, HSW or Type IV Design A. Starting BOD Concentration = Design Flow X Starting BOD (mg/L) X 8.35 : 1,000,000 �gpd X L =mg/LX 8.35 : 1,000,000 ° = Otbs. BOD/day Target BOD Concentration -= Design Flow X Target BOD (mg/L) X 8.35 : 1,000,000 g/L X 8.35 : 1, 000, C00 = tbs. BOD/day gpd X C rrl Lbs. BOD To B)e Removed: PreTreatment Technology: L� _]Must Meet or Exceed Target Disinfection Technology: [ — ]Required for Levels A Et B C. Organic Loading to Soil Treatment Area: �mg/LX C =gpd x8.35: 1,000,000: �ftz = tbs. /clay/ft2 10. Comments/S al Design Considerations: I hereby certify that I have completed this work in accordance with all applicable ordinances, rules and laws. Tom Trooien I �ss7�s�_7^c%'U-'Ci,�� 4/3/21= (Designer) (Signature) (License #) (Date) Preliminary MINN:SOTA POLLUTION f. Evaluation Worksheet M CONTIIOL AGENCY � , ._, :, ,. Ais". 1. Contact Information v 04.01.2020 Property Owner/Client: Jason Gamache _— Date Completed: 4/4/21 Site Address: 18401 River Acres Rd S Cottage Grove, MN 55016 Project ID: Email: I iason(aincentiverealtvmn.com Phone: IEEE] — Mai li ng Ad d ress: C —_ Legal Description: I -- —� Parcel ID: 33.027.21.24.0036 SEC: TWP: == RNG: C� 2. Flow and General System Information A. Client -Provided Information P roject Type: FINew Construction Replacement Expansion Repair Project Use: Residential FlOther Establishment: Residential use: # Bedrooms: �] Dwelling Sq.ft.: Unfinished Sq. Ft.: C� # Adults: �] # Children: # Teenagers: C� In -home business (Y/N): �] If yes, describe: 0 Garbage Disposal/Grincler 0 Dishwasher Hot Tub* Water -using devices: ❑ Sewage pump in basement Water Softener* Sump Pump* (check all that apply) large Bathtub >40 gallons Iron Filter* Self -Cleaning Humidifier* 0 Clothes Washing Machine High Eff. Furnace* Other: I Clear water source - should not go into system Additional current or future uses: -- Anticipated non -domestic waste: C The above is complete & accurate: C -- Client signature & date B. Designer -determined flow Information Attach additional information as necessary. Design Flow: ]GPD Anticipated Waste Type: Residential BOD: <170 ]mg/L TSS <60 mg/L Oil it Grease <25 ]mg/L 3. Preliminary Site Information A. Water Supply Wells Well Depth Casing Confining STA # Description Mn. ID# Lft.)_ Depth ft. Layer Setback Source 1 deep domestic well n/a 2 -- 3 4 Additional Well Information: The well Nvill be abandoned and the house will be connected to city water 4MWI � ItApV* rnste sacat;*n based on user jnW and dots not represent an avthorrtatnV PIN property locates 0 Sea-Med Fbodulap Boundary D-gital Data Amadab+e ho Digit* Data A%-aab&e 61A.P PANELS unmapped sck� Area of lAnirnal Flood Hazard zov x Effective L01.1 RS Area of undetermined Flood Hazard =�^� .` othtrw*e Protected Area�t 61rrr Rtrot SySttm Arta OTHER AREA SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD New Drainfield Cltti' of Cottage Grote 2 70502 1 1 Zone AE A'asnirrsprn Courie- . i'vil'., County o; DaKota, Esri, HERE, varmin, INCREIvI.. -- �-� l� without Onto Flood El on 48FE) iA.V.A99 With BFE of Depith Regulatory Floodway Zane Af. Ao, AN, w AR 0.2fib Annual Chance Flood Huard. Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of loss than one square mile . T. Future Condltwfs 1% Annual Chance Foot! Hazard = Area with Reduced Flood Risk due to Levee. See Notes. Z,3ft = Area with F 1I Risk due to Levee !O'2 Gross Sections Mrth 1% Annual Chance 1741 Water Surface Elevation o- — — Coastal Tfanrcct Sass Flood Elevation Line (BFE) Limit of Study Junsdictlon Boundary Coastal Transect Baseline OTHER _ Profile Baseline FEATL RES Hydrobraphic Feature GENERALI-- —' Channel, Culbert or Storm Sewer STRUCTURES i i c i i i i Le -see. Dike. or Floodv%a11