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HomeMy WebLinkAbout2022-12-01 TPC Planning Report TPC 3601 Thurston Avenue N, Suite 100 Anoka, MN 55303 (14. /2\ 1 Phone: 763.231.5840 Facsimile. 763.427.0520 TPC@PlanningCo.com PLANNING REPORT TO: Eric Johnson FROM: Scott Richards DATE: December 1 , 2022 RE: Oak Park Heights — Variance for Subdivision Process and Regulations, Variance for Lot Size, Variance for Lot Width — 15222 62nd Street and 15XXX 62nd Street TPC FILE: 236.02 — 22.11 BACKGROUND Jennifer Cates Peterson of Cates Fine Homes LLC/Setac Properties (Applicant) has made application for a variance from Subdivision Regulations and process, and variance for lot size and lot width to allow for construction on two single family lots at 15222 62nd Street and 15XXX 62nd Street. The property currently has one single family home that will be removed. The site consists of one parcel at 5,382 square feet in size and another with 10,758 square feet. The property is zoned R-2 Low and Medium Density Residential District. The property line is proposed to be moved to create two lots, one at 8,093 square feet, and the second one at 8,047 square feet. The proposed lots will not comply with lot size and lot width requirements of the R-2 District, requiring a variance. The other variance is required to allow the boundary line adjustment as a minor subdivision and not require a preliminary/final plat. EXHIBITS The review is based upon the following submittals: Exhibit 1: Project Narrative Exhibit 2: Site Location Map Exhibit 3: Certificate of Survey Exhibit 4: Neighborhood Lot Size Comparison Exhibit 5: Lot Line Adjustment Exhibit :6 Proposed House Elevations Exhibit 7: Proposed Floor Plans Exhibit 8: Landscape Plan — 15222 62nd Street Exhibit 9: Landscape Plan — 15XXX 62nd Street Exhibit 10: Stormwater Management Plan Exhibit 11: Utility Plan Exhibit 12: Report of the City Engineer PROJECT DESCRIPTION The Applicant has provided a project narrative that is found as Exhibit 1 of this report. The property at 15222 62nd Street has an existing house on a 40' wide lot. The property at XXXXX 62nd Street is an 80' wide vacant lot. We are proposing demolishing the home, splitting the 120' into (2) 60' lots, and building new homes on each lot. Enclosed is a site plan that shows each house fitting in the buildable setbacks and inspiration of what the homes would look like. These homes are conservative in size and their style fits the neighborhood. The lots will be fully landscaped, and trees will be planted for privacy and screening (see enclosed landscape plan). ISSUES ANALYSIS Comprehensive Plan. The property is designated as Low Density Residential on the Proposed Land Use Map. The two single family dwellings will be consistent with this land use designation. Zoning. The property is zoned R-2 Low and Medium Density Residential District. The District requires the following: District Lot Area Lot Width Building Height R-2 10,400 SF 80 feet 35 feet As indicated, the proposal is to create two lots, one at 8,093 square feet, and the second one at 8,047 square feet. Additionally, the proposed lot widths are 60.3 feet for 15222 62nd Street and 60.0 feet for 15XXX Street. The lots are adequately sized for the two houses proposed and all the setback requirements will be met. Section 401.15.C.1 Yard Requirements states the following: No lot, yard or other open space shall be reduced in area or dimension so as to make such lot, yard or open space less than the minimum required by this Ordinance, and if the existing yard or other open space as existing is less than the minimum required, it shall not be further reduced. No required open space provided for any building or structure shall be included as part of any open space required for another structure. Section 401.04.A General Provisions and Standards of the Zoning Ordinance lists criteria for review of a variance from the lot area and lot width requirements. A review of those criteria is found later in the report. 04-2 Subdivision. The provisions for review of a minor subdivision are found below. The request is to move the property line to create two lots of the same width. The provisions for minor subdivisions allow for an administrative approval if the new lots conform with the Zoning Ordinance lot size minimum standards. In this case, the minimum standards will not be met. Staff suggested that the minor subdivision process be used, rather than requiring a preliminary/final plat which would be a significant additional expense to the Applicant. G. Minor Subdivisions: a. Qualification: This section applies to the following applications: 1. In the case of a request to divide a portion of a lot where the division is to permit the adding of a parcel of land to an abutting lot so that no additional lots are created and both new lots conform to Zoning Ordinance lot size minimum standards c. Processing: 1. If the land division involves property which has been previously platted, or the total property area included is greater than ten (10) acres, the Zoning Administrator may approve the subdivision, provided that it complies with applicable provisions of this Chapter. There are no criteria for a variance from procedural standards of the Subdivision Ordinance, but the Planning Commission and City Council should determine if allowing this boundary line adjustment is appropriate. Based on the fact that the request is a simple adjustment of a lot line, this should be processed as a minor subdivision. Setbacks. The R-2 District requires the following: District Front Yard Side Yard Rear Yard R-2 30 feet') 10 feet2) 30 feet The proposed setbacks are compliant with the requirements of the R-2 District. Building Height. The building height maximum in the R-2 District is 35 feet. The single family structures proposed for these two lots will be well within that height limit. Parking. Section 401.15.F.9. of the Zoning Ordinance provides the parking requirements for single family dwellings as follows: Single Family, Two-Family, and Townhouse Unit. Two (2) spaces per unit, both of which are in a covered garage structure. Each of the single family structures will have a two stall garage and adequate room on the driveways for an additional two cars per lot. 04-3 Grading/Drainage/Utilities. The Applicant has provided a stormwater management plan and utility plan for the project. The plans shall be subject to review by the City Engineer. Landscaping. A landscape plan is provided for each of the two lots. The proposed landscaping is appropriate for single family development. The landscape plans are subject to review and comments of the City Arborist. Design Criteria — Single Family. Sections 401 .15.C.7-8 provide single family building requirements for new construction. The proposed single family homes appear to meet the requirements, but the final plans will be considered at the time of building permit review. Variance Criteria — Zoning. Review Criteria. In considering all requests for a variance and in taking subsequent action, the Planning Commission and City Council shall make a finding of fact that the proposed action will not: a. Impair an adequate supply of light and air to adjacent property. b. Unreasonably increase the congestion in the public street. c. Have the effect of allowing any district uses prohibited therein, permit a lesser degree of flood protection than the flood protection elevation for the particular area, or permit standards which are lower than those required by State law. d. Increase the danger of fire or endanger the public safety. e. Unreasonably diminish or impair established property values within the neighborhood, or in any way be contrary to the intent of this Ordinance. f. Violate the intent and purpose of the Comprehensive Plan. g. Violate any of the terms or conditions of Item 5, below. 5. Conditions. A variance from the terms of this Ordinance shall not be granted unless it can be demonstrated that: a. Undue hardship will result if the variance is denied due to the existence of special conditions and circumstances which are peculiar to the land, structure, or building involved and which are not applicable to other lands, structures or buildings in the same district. 1) Special conditions may include exceptional topographic or water conditions or, in the case of an existing lot or parcel of record, narrowness, shallowness, insufficient area or shape of the property. 04-4 2) Undue hardship caused by the special conditions and circumstances may not be solely economic in nature, if a reasonable use of the property exists under the terms of this Title. 3) Special conditions and circumstances causing undue hardship shall not be a result of lot size or building location when the lot qualifies as a buildable parcel. b. Literal interpretation of the provisions of this Ordinance would deprive the applicant of rights commonly enjoyed by other properties in the same district under the terms of this Ordinance or deny the applicant the ability to put the property in question to a reasonable use. c. The special conditions and circumstances causing the undue hardship do not result from the actions of the applicant. d. Granting the variance requested will not confer on the applicant any special privilege that is denied by this Ordinance to other lands, structures or buildings in the same district under the same conditions. e. The request is not a result of non-conforming lands, structures or buildings in the same district. f. The request is not a use variance. g. The variance requested is the minimum variance necessary to accomplish the intended purpose of the applicant. h. The request does not create an inconvenience to neighboring properties and use. Comment: The Planning Commission and City Council should review the above criteria regarding the request for the Zoning variance. City Staff sees no neighborhood, public service, public safety, or infringement on adjoining property issues with this request. The neighborhood has been developed with a variety of lot sizes, some similar to what is proposed. The proposed lots and houses will not be at odds with what is already in place in the neighborhood. Variance Criteria — Subdivision. There are no criteria for a variance from procedural standards of the Subdivision Ordinance, but the Planning Commission and City Council should determine if allowing this boundary line adjustment is appropriate as an administrative approval. Based on the fact that the request is appropriate for a minor subdivision, the variance is supported by Staff. CONCLUSION / RECOMMENDATION Subject to the requests for a variance from Subdivision Regulations and process, and variance for lot size and lot width to allow for construction on two single family lots at 04-5 15222 62nd Street and 15XXX 62nd Street, Staff would recommend approval with the following conditions: 1. The landscape plans are subject to review and comments of the City Arborist. 2. The final grading, drainage and utility plans shall be subject to the review and approval of the City Engineer. 3. Any other conditions of the Planning Commission and City Council. PC: Julie Hultman 04-6 CATES FINE HOMES a� PROJECT NARRATIVE Project Address: 15222 62nd Street & xxxxx 62nd Street Project Description: The property at 15222 62nd Street has an existing house on a 40' wide lot. The property at xxxxx 62nd Street is an 80' wide vacant lot. We are proposing demolishing the home, splitting the 120' into (2) 60' lots, and building new homes on each lot. Enclosed is a site plan that shows each house fitting in the buildable setback and inspiration of what the homes would look like. These homes are conservative in size and their style fits the neighborhood. The lots will be fully landscaped and trees will be planted for privacy and screening (see enclosed landscape plan). office 651.439.2844 I fax 651.430.2922 I web catesfinehomes.com 2000 industrial boulevard 1 stillwater I minnesota 55082 MN LIC# BC533260 I MIME. I N kuno-J uolBulyseM'ZZOZ146urtdo0 CD enawas w...�..z:.c•ce.r".n.w, F ! . HI I % 4 AA a € 84' I ; t �ill a --' 1 — 10,ei ��� � _ iii 1 t; -fr d'r` 111ill, Aka) -_,:0;.;;0071,7., ;,,,i,,, , I TIOirl at hd • , 00 : ' S' � tip Q m ' a i a1fi �® 410 ® ill.,-;--3._*4-,0 in \I ' _, _ ----.-„,,,, s, go"__-_ . _ 11 1 .0000. - ....., --,- . \„ •• -,,-.--=2"- .--- -J....1 opowinim ninill I i i i 1 Ii V' 1ri.,,..,,nano ' a 01119 . g ., ,..,; 13 _,___,...,.----...._ v. % ,„,‘:-.... 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"7g Fzg, VN J{ 6v, p pL < 01 x'n .iiR I ,,,,,,,,:t.,7 -, *'',.., ',,,,f ,°'7 4. .: .,. . , 0! br z ;;ir,W r a7 [ ., / Fg5 li s d tiei i ,rE '' 1 v.. t , ,4.... r y.. 0 8 0 Ai 7 F Was 1JUl10U oR < 5 ~S Fd n 'ate o a o a W a to 8 i gp �PHllP cZti� �{ to s/osysg o-a alliin P 1 F , i;s�'Ie., hf Z v ; I I- 1 V UN.F1F<u�h g 8 118 5> tle In .poi --- s��bnia t> tQ� i Gpfic STORMWATER MANAGEMENT PLAN Lots 29, 30, & 31 , Block 16 Mckenty's Addition to Stillwater 15222 62nd Street N Oak Park Heights, Minnesota November 16th 2022 Rev. —November 28th, 2022 Rev. —November 29th, 2022 Prepared By: Prepared For: Cates Fine Homes DEMARC 200 Industrial Boulevard Stillwater, MN 55082 LAND SURVEYING & ENGINEERING I hereby certify that this Plan, Specification or Report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. ek" .152706 11.16.22 Ak 'Jeffrey A Prasch, 'E License Number Date • Project Engineer Stormwater Management Plan 15222 62nd Street N —Oak Park Heights, MN Rev. - November 29th, 2022 Table of Contents Table of Contents 1.0 Project Overview ii 2.0 Design Considerations ii 3.0 Rate Control ii Table 3.1 —Discharge Rate Summary ii 4.0 Volume Control ii Table 4.1 —Discharge Volume Summary Appendix A— Figures Figure 1 —Drainage Areas Existing Conditions Figure 2—Drainage Areas Proposed Conditions Figure 3—Precipitation Data Appendix B —Existing Conditions 2-Year Summary 1-3 Appendix C —Existing Conditions 10-Year Summary 4-5 Appendix D— Existing Conditions 100-Year Summary 6-7 Appendix E—Proposed Conditions 2-Year Summary 7-11 Appendix F— Proposed Conditions 10-Year Summary 12-14 Appendix G—Proposed Conditions 100-Year Summary 15-17 Appendix H —Soils Data 1-3 Stormwater Management Plan 15222 62nd Street N—Oak Park Heights, MN Rev. - November 29th, 2022 1.0 Project Overview A Lot Split with two new residences is being proposed at 15222 62nd Street N in the City of Oak Park Heights, Minnesota. The current site is 0.61 acres with a residence, concrete sidewalk, stoop, concrete slab, and gravel driveway on the property. There are existing residences to the north, east, and west with street to the south. Currently, the entire property slopes down to the east causing all of the stormwater to flow onto private property. The existing drainage conditions are shown in Figure 1. The proposed improvements include a lot split into two separate residences that each will have a new residence. The house located to the east will have a porch, deck, sidewalk, and driveway. The house to the west will have a sidewalk and driveway. For the proposed conditions, the existing flow path will be disrupted with the addition of the second house. The proposed grading will direct water from the west side yard, middle side yard, and front yards towards the street with the rear yard and east side yard flowing to private property. This grading will allow for a decrease in rates and volume discharged to private property. Figure 2 shows the proposed drainage conditions. 2.0 Design Considerations The site is under the jurisdiction of the City of Oak Park Heights. According to the City of Oak Park Heights Engineering Department, as long as rates and volume discharged to private property in the 2, 10, and 100-yr storms are decreased, then on-site storage will not be required for this site. The on-site storm water system design is based on their guidelines: Rate and Volume Modeling Software— HydroCAD 10.10 Rainfall Distribution — MSE 24-hour Type III Rainfall Data — NOAA Atlas 14 rainfall data as shown in Figure 3. Soil Conditions— Hydrologic Soil Group B based on Web Soil Survey shown in Appendix D. 3.0 Rate Control The City regulates the rate of water discharged from the site. The requirement is that there be no increase in peak rate to private properties for the 2, 10, or 100 year annual probability events. Table 3.1 shows the existing and proposed runoff rates to private property. Table 3.1 — Discharge Rate Summary Discharge Rate [cfs] Discharge Node Storm Event 2-Year 10-Year 100-Year Pre- Post- Pre- Post- Pre- Post- Private Property 0.32 0.30 0.83 0.63 2.31 1.55 As shown in the table above, the discharge rates to private property is reduced for each storm cycle, therefore the requirement is met. See the HydroCAD summary in Appendices B-G. 4.0 Volume Control The City regulates the volume of water discharged from the site. If there is no increase in volume of water discharged to private property, no on-site ponding is required. The impervious area and volume control summary can be found in Table 4.1. ii Stormwater Management Plan 15222 62nd Street N—Oak Park Heights, MN Rev. - November 29th, 2022 Table 4.1 — Discharge Volume Summary Discharge Volume [cf] Discharge Node Storm Event 2-Year 10-Year 100-Year Pre- Post- Pre- Post- Pre- Post- Private Property 879 775 1,907 1,480 4,945 3,439 As shown in Tables 4.1, the proposed discharge volume is less than the existing discharge volume, therefore the requirement is met. See the HydroCAD summary in Appendices B-G. iii Appendix A Figures LEGEND: U a r. x8614.7 I e f 004 munuaerr e.FM m b "IA x�d7,l.x!��J 0 t" w.�,r». _ 8145.5 mss. xeu.14 ti �I ��xaw.e ® • , cd€ �� 8145.5 + �(� ' °619 "'�07.� �i .mTi�" :� ® go v <W + :s „�, x882.8 leI '-'141 .-- ®fl ,;; e- num Ws x86!.3 ' xeee x885.5'` ' ues ' 25.ITNG i x ' � K B'`� 1 s �" .: �, ._.. UJ mE OD BfKITNC PARCEL B it' •; '1;-,0, O* e U .w"„ Q i A'�..�.• 2.85x, ! 5 S• ® a ,n reEr � 1 ..,.:t7:.,-;`` zeas IlkCEDAR'10 ^. S5............ an BL:,'+:1.``.. gyp.. +: e� l ■: ®0._,.., 149 451' �2r� p.,aw w"�" eee.s 1" xee14.e��� j • CL z . rc"e eat.. 0 20 Io 111 0, ~ L9- "'"i - °6 O Q�_ '�r" • SCALE N FEET � „"" • Q F C7 Z 885.5 s w k —i— m,.w rn •a ii1E i 51 2.814x5 x860.5 8 2.w mxw 01 J Z Y =514 's m �,—'I } g 1S $ UBCATCHMENT NUMBER `°""""'"""` I. Z Vl N Q o, ' (, O O W �a oy a ® ue N t',6e x /(/ ' W ., PONDICATCH BASIN NUMBER m...,n J V _ O � • 3•••,,,......m 'i y _e �J UNK NUMBER a ....... g x. 2..s o 5.....,999...s.a..:..."m.., 1R REACH NUMBER �i �� x��e + •ma„ „880.0 0•99901•10,8 69.89 V) :.5.14 + ee..e x14614. +tr, x1458.8 DRAINAGE ARROW o ,.w..•.0 z n— Fti.s ' ,.0 x8614.2. x85..0 I ' , Q 3 �;- xeax.d Alk88" Proposed hlardcover fxistmg Hardcover W Q x x865 6 ! '_ 'S 2.14x8 Lot Area l 6./40 sq k Cot Area l 6,/40 sq k x856 U x 885°6 ! Budd ng(West) 1,856 sq k Sold ng(West) 864 sq k VQ '.6 %B6J B6• +. 'ORa�' Budding(East) 2,050 sq ft Gravel Dave 1,075 sq k z x-- 867.6- Conc. 880.87.9 I-6,, �3-9 =\Ips ' " � "x'• Deck(fast) I4D sq ft Conc.Wilk /44 sq ft F= "BSD° Porch(East) /3Bsgk 5tooP 4/sq ft p co iii x ....s lia x8514.8 8'ry x wa>+3. x8514.14 x8575 Conc.Walk(East) 48 sq ft Conc.Slab 247 sq ft xee>.6 II 1465.2. ros.z - x ® 0,s.way(East) 542 sq k Total --�-2,371 sq ft `• LS Driveway(West' 574 sq ft Percentage 14.69% an., 655.6 L66e' -eex7 6 Conc.Walk(West) 30 sq ft 62ND ST. N. 1r-- Total 5.378 sq k FIGURE 1 .—T— Percentage 33.32% 11.16.2022 LEGEND: y: I Y . x660.) 1 861.61{1 , *147R O 5,4 I: OUT.....,,, 2 g aa, X72.4 a 11 6xw.a xsea = ® •` c8 X86211 ® ®" d, ® Zia 2. s; 563 • �_ _ a ....- floe, x6661{ y" } °6.' :. 25. 2. •I ®w I �RNL I -) r.4-___— p >,,, Wae PARCELS a _4 IXISRNC / 12•';(, '.. lJ ruwwa • a ,�-, -0ARCEL A Yee —\ ''.�.,..j� / 51 • wu <B SOL XS,. �«°� ~" ®, nu � 2 o uumOLE — ;1.,..i. .x I -� '_ (88457.4 0 20 40 M-ILI r W M —.0—graX84801141C. '� —.---1.•1 I , '7- 1T - SCALE IN FEET —>—_ 0 Q pe _a ka .' S.. . R_ i xa6z.21 x56oPARCELEn } gpnpp ` ' A F Z Y 14 ?9 9v PARCEL 2 ^Y S 4�a cxnvu.ce fp 8 1 —Am:— yx Y iS SUBCATCHMENT NUMBER .'�I,si,.. . F Z y)6�6 111 1 566 n,� SKr �JY� a Sas II: s '� i ® POND/CATCH BASIN NUMBER H O 0 mw a LINK NUMBER 1 R REACH NUMBER ^� %/ 6.�>s wpm Coffin CO tii -.0 o�n.6ace e>.wm 8c,,,..Pnyased Banton 9 * � ,... ` ..s • DRAINAGE ARROW om.e,ma.sm o..�. .O y � 1 2. , , 1 a 6o x.. ce - i • i xaa , ' Proposed Hardcover f rstmg Hardcover drover Q 0 � --- - 1 -a.v- j„.„.....0 Lot Area 16,140 sq ft Lot Area /6,140 sq ft 0(1 ,- --� 1,._______x_H_ it B Burklrng(West' 1,856 sq ft Budding hYestl B64 sq ft Q 0xea '#405 a �� ze6 bzIi Budding(East) 2,050 sq ft Grave/awe 1,075 5q ft Z W 002.0 05.1) MPH;up �i) 1/l• Z Deck(East) 140 sq ft Conc.Walk 144 sq ft g 0 X/557.4 > "r S- - Porch(fast) 136 sq k Stoop 4l sq ft CI 0- 7 abei.: x054.6 - .4?+8�zaw....,.s Conc.Walk(East) 45 sq ft Conc.Slab 247 sq ft re B82 Onveway(East) 542 sq ft Total 2,37/sq ft d X1557.8 • gcr.,l�� e a67a - s oez7 ® Dnveway(West) 574 sq ft Percentage 14.69% Conc.Walk(West) 30 sq ft 62ND ST. N. x 1)e Total 5,376 sq ft FIGURE 2 Percentage 33.32% Rev.-11.20.2022 FIGURE 3 - PRECIPITATION DATA NOAA Atlas 14,Volume 8,Version 2 - Location name:Minneapolis, Minnesota, USA* s Latitude:44.9126°, Longitude:-93.3445° °ofliti r, Elevation:919.99 ft'" tV..., !% *source:ESRI Maps "source:USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica.Deborah Martin.Sandra Paviovic,Ishani Roy,Michael St.Laurent,Cad Trypaluk Dale Unruh,Michael Yelda.Geoffery Bonnin NOAA,National Weather Service,Silver Spring,Maryland PF tabular I PF graphical I Maps &aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval(years) Duration j 1 2 5 I-- 10 Li 25 25 50 100 200 500 1000 5-min 0.353 l 0.419 0.532 I 0.630 I 0.773 I 0.889 1.01 1.14 1.31 1.45 (0.288-0.438) (0.342-0.520) (0.432-0.662)1(0.509-0.788)1(0.605-1.00)!(0.677-1.17) (0.741-1.35) (0.798-1.56) (0.884-1.85) (0.949-2.07) 10-min 0.517 0.613 0.778 I 0.923 1.13 1.30 1.48 1.67 1.92 2.13 (0.422-0.642) (0.501-0.762) (0.633-0.970)1 (0.746-1.15)1(0.886-1.47)1(0.992-1.71) (1.09-1.98) (1.17-2.29) (1.30-2.71) (1.39-3.03) 15-min0.630 0.748 0.949 1.13 1.38 I 1.59 1.80 2.03 2.35 2.60 (0.515-0.783) (0.610-0.929) (0.772-1.18) (0.909-1.41) (1.08-1.79)1 (1.21-2.08) (1.32-2.42) (1.43-2.79) (1.58-3.31) (1.70-3.69) 30-min 0.891 I 1.07 1.36 1.62 2.00 2.30 2.61 2.94 3.40 3.77 1 (0.729-1.11) 1 (0.870-1.32) (1.11-1.70) (1.31-2.03) 1 (1.56-2.59) (1.75-3.01) (1.92-3.50) (2.07-4.05) (2.29-4.79) (2.48-5.36) 60-min 1.16 1.39 1.78 2.16 2.70 3.17 3.67 4.21 4.99 5.61 1 (0.950-1.44), (1.13-1.72) (1.45-2.22) (1.742.69) (2.13-3.54) (2.42-4.19) (2.70-4.95) (2.96-5.82) (3.36-7.05) (3.66-7.98) 2-hr 1.43 1 1.70 2.21 2.68 3.41 4.04 4.73 5.48 1 6.67 7.46 (1.18-1.77) 1 (1.40-2.10) (1.81-2.73) (2.18-3.33) (2.71-4.46) (3.12-5.32) (3.51-6.36) (3.89-7.54)J (4.47-9.25) (4.90-10.5) 3-hr1.60 I 1.89 2.46 3.00 I 3.87 4.63 I 5.48 6.41 I 7.78 8.91 (1.32-1.96) 1 (1.56-2.33) (2.02-3.03) (2.45-3.71) 1 (3.10-5.07) (3.60-6.10)1 (4.09-7.36) (4_58_8.82)I (5.33-10.9) (5.89-12.5) 1.88 1 2.21 2.86 3.51 4.66 I 5.49 6.53 7.69 9.41 10.8 l 6-hr (1.56-2.29) 1 (1.83-2.70) (2.36-3.50) (2.88-4.311) (3.69-5.96)1 (4.30-7.20) (4.92-8.74) (5.54-10.5) (6.49-13_2) [(7.21-15.1)J 2.13 I 2.63 3.27 3.98 5.09 6.06 I 7.11 1 8.28 1 9.9711.4 12-hr (1.78-2.58) (2.11-3.06) (2.72-3.97) , (3.29-4.86) (4.12-8.56) (4.76-7.85)1 (5.38-9.41)I (5.99:11.2) ! (6.92-13.8) (7.62-15.8) 24-hr 2.49 I 2.86 I 3.68 I 4.29 6.41 6.39 7.49 8.71 ! 10.5 12.0 I (2.09-3.00) i (2.40-3.45) 1 (2.99-4.32) 1 (3.56-5.19) (4.41-6.92) (5.06-8.23) (5.71-9.85) (6.35-11.7)1 (7.34-14.4) (8.09-16.511 2.90 I 3.25 3.94 4.63 1 5.76 6.76 I 7.88 9.13 11.0 12.5 2-day (2.45-3.46) 1 (2.74-3.88) (3.31-4.72) (3.87-5.57) 1_(4.74-7.32) (5.39-8.64)1 (6.05-10.3) (8.72-12.2J (7.75-15.0) (8.53-17.1)I 3.17 I 3.52 I 4.23 4.936.06 7.07 I 8.20 9.47 11.3 12.9 3-day (2.68-3.76) 1 (2.98-4.19) 1 (3.56-5.04) (4.13-5.90) 1 (5.00-7.66) (5.68-9.00)I (6.33-10.7) (7.00-12.6) (8.03-15.4) (8.82-17.5) 3.37 3.76 4.50 5.22 6.38 7.40 1 8.52 9.78 1 11.6 13.1 4-day (2.87-4.00) I (3.19-4.46) 1l(3.80-5.35) (4.39-8.23) (5.27-8.01) (5.93-9.36)1 (6.59-11.0) (7.24-12.9) (8.25-15.7) (9.02-17.8) 7-day 3.88 I 4.38 I 5.27 6.09 7.31 I 8.34 I 9.44 I 10.6 12.3 13.7 (3.31-4.57)J (3.745.16) 1 (4.48-6.23) (5.14-7.22) (6.02-9.04) (6.69-10.4)J (7.31-12.1)j (7.89-13.9)I (8.78-16.5) (9.46-18.5) 4.37 1 4.95 6.96 6.83 8.11 I 9.16 I 10.2 11.4 13.0 14.2 10-day 1 (3.74513) 1 (4.24-5.82) (5.08-7.01) (5.79-8.08) (6.67-9.93)1 (7.34-11.3)il (7.93-13.0) (8.45-14.8) (9.26-17.3) I(9.87-19.1) 20-day ( 5.94 I 6.67 I 7.86 I 8.86 10.3 11.3 I 12.4 13.5 I 15.0 16.1 (5.12-6.92)J (5.74-7.77) 1 (6.74-9.19) I (7.56-10.4) 1 (8.45-12.4) (9.13-13.8)1 (9.67-15.5) (10.1-17.3) (10.8-19.7) (11.3-21.6) ' 7.33 1 8.19 9.56 10.7 I 12.2 13.3 1 14.6 I 16.6 17.0 I 18.1 30-day 1 (6.34-8.50) 1L(7.07-9.50) (8.23-11.1) (9.14-12.5) (10.1-14.6) (10.8-16.2)i (11.3-17.9)1 (11.7-19.8) (12.3-22.2) (12.7-24.1) I 9.13 10.2 11.9 r 13.2 l 14.9 16.2 17.4 18.5 19.9 20.9 46-day 1 (7.93-10.5) (8.84-11.8) (10.2-13.7) 1 (11.3-15.3) 1 (12.3-17.7) (13.1-19.5)1 (13.6-21.4) (13.9-23.4) (14.4-25.8)J[<14.88-27.7) It. 10.7 1 12.0 I 13.915 5 1 17.4 1 18.8 I 20.1 ( 21.2 22.6 23.5 60-day i 0.30-12.3). 1 (10.4-13.8) 1 (12.1-16.1)NL(13.3-17.9) 1l(14.4-20.5) l(15.2-22.5)1 (15.7-24.6)![(16.00-26 7)� (18.4-29.2) (16.7-31.1) I Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS). Numbers in parenthesis are PF estinetes at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for a given duration and average recurrence interval)w ill be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not checked against probable maximum precipitation(PNP)estimates and may be higher than currently valid PNP values. Please refer to NOAA Atlas 14 document for=renfornstion. ____ Back to Top Appendix B Existing Conditions 2-Year Summary Private Property Subcat' Reach -ons Link Routing Diagram for Existing Conditions J Prepared by Demarc, Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Existing Conditions MSE 24-hr 3 2-Year Rainfall=2.86" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 2 Time span=0.00-72.00 hrs,dt=0.01 hrs,7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=16,140 sf 14.69%Impervious Runoff Depth=0.65' Tc=7.0 min CN=61/98 Runoff=0.32 cfs 879 cf Total Runoff Area=16,140 sf Runoff Volume=879 cf Average Runoff Depth=0.65" 85.31%Pervious=13,768 sf 14.69%Impervious=2,371 sf Existing Conditions MSE 24-hr 3 2-Year Rainfall=2.86" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 3 Summary for Subcatchment 1: Private Property Runoff = 0.32 cfs @ 12.15 hrs, Volume= 879 cf, Depth= 0.65" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/lmperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 2-Year Rainfall=2.86" Area(sf) CN Description 13,768 61 >75%Grass cover,Good,HSG B 2,371 98 Roofs,HSG B 16,140 66 Weighted Average 13,768 61 85.31%Pervious Area 2,371 98 14.69%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph 0.36 ■Runoff 0.34 0.32 cfs 0.32 MSE 24-hr-3 0.3= 0.26= 2-Year Rainfall=2.86" 0.24= Runoff Area=16,140 sf 0.221 - Runoff Volume=879 cf 0.2 0.18= Runoff Depth=0.65" Tc=7.0 m i n CN=61/98 0.12 0.08 0.06; 0.04 0.0211 0 . 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Appendix C Existing Conditions 10-Year Summary Existing Conditions MSE 24-hr 3 10-Year Rainfall=4.29" Prepared by Demarc Printed 11/16/2022 HydroCAD&10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Page 4 Time span=0.00-72.00 hrs,dt=0.01 hrs,7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=16,140 sf 14.69%Impervious Runoff Depth=1.42" Tc=7.0 min CN=61/98 Runoff=0.83 cfs 1,907 cf Total Runoff Area=16,140 sf Runoff Volume=1,907 cf Average Runoff Depth=1.42" 85.31%Pervious=13,768 sf 14.69%Impervious=2,371 sf Existing Conditions MSE 24-hr 3 10-Year Rainfall=4.29" Prepared by Demarc Printed 11/16/2022 HydroCAD©10.10-5a sin 09313 ©2020 HydroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 1: Private Property Runoff = 0.83 cfs @ 12.15 hrs, Volume= 1,907 cf, Depth= 1.42" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 10-Year Rainfall=4.29" Area(sf) CN Description 13,768 61 >75%Grass cover,Good,HSG B 2,371 98 Roofs,HSG B 16,140 66 Weighted Average 13,768 61 85.31%Pervious Area 2,371 98 14.69%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph 0.9 Runoff 0.83 cfs 0.85= 0.83 MSE 24-hr 3 0.75 10-Year Rainfall=4.29" 0.7' 0.65= I Runoff Area=16,140 sf • Runoff Volume=1 907 cf 0.55: , 0.5T: Runoff Depth=1.42" c 0.45_ 0.4_ Tc=7.0 min 0.35= CN=61/98 0.31, 0.25 0.23. 0.15 0.05= 0' 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Appendix D Existing Conditions 100-Year Summary Existing Conditions MSE 24-hr 3 100-Year Rainfall=7.49" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 6 Time span=0.00-72.00 hrs,dt=0.01 hrs,7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=16,140 sf 14.69%Impervious Runoff Depth=3.68" Tc=7.0 min CN=61/98 Runoff=2.31 cfs 4,945 cf Total Runoff Area=16,140 sf Runoff Volume=4,945 cf Average Runoff Depth=3.68" 85.31%Pervious=13,768 sf 14.69%Impervious=2,371 sf Existing Conditions MSE 24-hr 3 100-Year Rainfall=7.49" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a sin 09313 ©2020 HydroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 1: Private Property Runoff = 2.31 cfs© 12.14 hrs, Volume= 4,945 cf, Depth= 3.68" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 100-Year Rainfall=7.49" Area(sf) CN Description 13,768 61 >75%Grass cover,Good,HSG B 2,371 98 Roofs,HSG B 16,140 66 Weighted Average 13,768 61 85.31%Pervious Area 2,371 98 14.69%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph / LL- 2.31 2.31 cfs MSE 24-hr 3 2_ 100-Year Rainfall=7.49" Runoff Area=16,140 sf Runoff Volume=4,945 cf - Runoff Depth=3.68" LL Tc=7.0 min 1 CN=61/98 0 . 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Appendix E Proposed Conditions 2-Year Summary 111 0 Private Property Street Subcat' Reach and Link Routing Diagram for Proposed Conditions / Prepared by Demarc, Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ®2020 HydroCAD Software Solutions LLC Proposed Conditions MSE 24-hr 3 2-Year Rain fall=2.86" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 9 Time span=0.00-72.00 hrs,dt=0.01 hrs,7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=9,805 sf 27.41%Impervious Runoff Depth=0.95" Tc=7.0 min CN=61/98 Runoff=0.30 cfs 775 of Subcatchment2:Street Runoff Area=6,335 sf 42.48%Impervious Runoff Depth=1.30" Tc=7.0 min CN=61/98 Runoff=0.28 cfs 685 cf Total Runoff Area=16,140 sf Runoff Volume=1,459 cf Average Runoff Depth=1.09" 66.67%Pervious=10,761 sf 33.33%Impervious=5,379 sf Proposed Conditions MSE 24-hr 3 2-Year Rainfall=2.86" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 10 Summary for Subcatchment 1: Private Property Runoff = 0.30 cfs @ 12.15 hrs, Volume= 775 cf, Depth= 0.95" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 2-Year Rainfall=2.86" Area(sf) CN Description 7,117 61 >75%Grass cover,Good,HSG B 308 98 Paved parking,HSG B 2,380 98 Roofs,HSG B 9,805 71 Weighted Average 7,117 61 72.59%Pervious Area 2,687 98 27.41%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (f/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph / L Runoff 0.32- 0.30 cfs 03- MSE 24-hr 3 0.28- 0.26- 2-Year Rainfall=2.86" 0.24- Runoff Area=9 805 sf 0.22 0.2- Runoff Volume=775 cf 0.18 0.16- Runoff Depth=0.95" c rc 0.14 Tc=7.0 min 0.12- 0.1- .120.,_ CN=61/98 0.08 0.06- 0.04- 0.02 .06-0.04=0.02 0- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Proposed Conditions MSE 24-hr 3 2-Year Rainfall=2.86" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Pace 11 Summary for Subcatchment 2:Street Runoff = 0.28 cfs t 12.14 hrs, Volume= 685 cf, Depth= 1.30" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 2-Year Rainfall=2.86" Area(sf) CN Description 3,644 61 >75%Grass cover,Good,HSG B 1,165 98 Paved parking,HSG B 1,526 98 Roofs,HSG B 6,335 77 Weighted Average 3,644 61 57.52%Pervious Area 2,691 98 42.48%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 2: Street Hydrograph 0.32 0.28 cfs G Runoff 0.26. MSE 24-hr 3 0.26 0.24= - 2-Year Rainfall=2.86" 0.22= Runoff Area=6,335 sf 0.2 Runoff Volume=685 cf Runoff Depth=1.30" 3 _ s 0.14 0.12 Tc=7.0 min 0,1-] CN=61/98 0.06 0.04 0.02 0 0 2 4 6 8 10 12 14 1618 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Appendix F Proposed Conditions 10-Year Summary Proposed Conditions MSE 24-hr 3 10-Year Rainfall=4.29" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 12 Time span=0.00-72.00 hrs,dt=0.01 hrs.7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=9,805 sf 27.41%Impervious Runoff Depth=1.81" Tc=7.0 min CN=61/98 Runoff=0.63 cfs 1,480 cf Subcatchment2:Street Runoff Area=6,335 sf 42.48%Impervious Runoff Depth=2.28" Tc=7.0 min CN=61/98 Runoff=0.51 cfs 1,202 of Total Runoff Area=16,140 sf Runoff Volume=2,682 cf Average Runoff Depth=1.99" 66.67%Pervious=10,761 sf 33.33%Impervious=5,379 sf Proposed Conditions MSE 24-hr 3 10-Year Rainfall=4.29" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 Cl)2020 HydroCAD Software Solutions LLC Paae 13 Summary for Subcatchment 1: Private Property Runoff = 0.63 cfs @ 12.15 hrs. Volume= 1,480 cf, Depth= 1.81" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 10-Year Rainfall=4.29" Area(sf) CN Description 7,117 61 >75%Grass cover,Good,HSG B 308 98 Paved parking,HSG B 2,380 98 Roofs,HSG B 9,805 71 Weighted Average 7,117 61 72.59%Pervious Area 2,687 98 27.41%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph 0.7- E Runoff 0.65 0.63 cfs MSE 24-hr 3 0.6- 0.55- 10-Year Rainfall=4.29" 0.5 Runoff Area=9,805 sf 0.45- 4 Runoff Volume=1,480 cf 0.4 Runoff Depth=1.81" 0.35- 0.3_ Tc=7.0 min 0.25- CN=61/98 0/- 0.15- 0.05: 0- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Proposed Conditions MSE 24-hr 3 10-Year Rainfall=4.29" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a sin 09313©2020 HydroCAD Software Solutions LLC Paae 14 Summary for Subcatchment 2:Street Runoff = 0.51 cfs @ 12.14 hrs, Volume= 1,202 cf, Depth= 2.28" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 10-Year Rainfall=4.29" Area(sf) CN Description 3,644 61 >75%Grass cover,Good,HSG B 1,165 98 Paved parking,HSG B 1,526 98 Roofs,HSG B 6,335 77 Weighted Average 3,644 61 57.52%Pervious Area 2,691 98 42.48%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 2:Street Hydrograph 0.55: 0.51 cfs L Runoff 0.5- MSE 24-hr 3 0.452 10-Year Rainfall=4.29" Runoff Area=6,335 sf 0.35_ Runoff Volume=1,202 cf ▪ 0.32 Runoff Depth=2.28" T.• 0.25= Tc=7.0 min 0.22 C N=61/98 0.15= • • 0.11 0.052 A 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Appendix G Proposed Conditions 100-Year Summary Proposed Conditions MSE 24-hr 3 100-Year Rainfall=7.49" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 15 Time span=0.00-72.00 hrs,dt=0.01 hrs,7201 points Runoff by SCS TR-20 method,UH=SCS,Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchmentl:Private Property Runoff Area=9,805 sf 27.41%Impervious Runoff Depth=4.21" Tc=7.0 min CN=61/98 Runoff=1.55 cfs 3,439 cf Subcatchment2:Street Runoff Area=6,335 sf 42.48%Impervious Runoff Depth=4.84" Tc=7.0 min CN=61/98 Runoff=1.12 cfs 2,555 cf Total Runoff Area=16,140 sf Runoff Volume=5,995 cf Average Runoff Depth=4.46" 66.67%Pervious=10,761 sf 33.33%Impervious=5,379 sf Proposed Conditions MSE 24-hr 3 100-Year Rainfall=7.49" Prepared by Demarc Printed 11/16/2022 HydroCAD®10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 1: Private Property Runoff = 1.55 cfs @ 12.14 hrs. Volume= 3,439 cf, Depth= 4.21" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/lmperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 100-Year Rainfall=7.49" Area(sf) CN Description 7,117 61 >75%Grass cover,Good,HSG B 308 98 Paved parking,HSG B 2,380 98 Roofs,HSG B 9,805 71 Weighted Average 7,117 61 72.59%Pervious Area 2,687 98 27.41%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1: Private Property Hydrograph D Runoff 1.55 cfs MSE 24-hr 3 100-Year Rainfall=7.49" Runoff Area=9,805 sf Runoff Volume=3,439 cf 1 Runoff Depth=4.21" Tc=7.0 min CN=61/98 0- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Proposed Conditions MSE 24-hr 3 100-Year Rainfall=7.49" Prepared by Demarc Printed 11/16/2022 HydroCAD©10.10-5a s/n 09313 ©2020 HydroCAD Software Solutions LLC Paae 17 Summary for Subcatchment 2:Street Runoff = 1.12 cfs @ 12.14 hrs, Volume= 2,555 cf, Depth= 4.84" Runoff by SCS TR-20 method,UH=SCS,Split Pervious/lmperv.,Time Span=0.00-72.00 hrs,dt=0.01 hrs MSE 24-hr 3 100-Year Rainfall=7.49" Area(sf) CN Description 3,644 61 >75%Grass cover,Good,HSG B 1,165 98 Paved parking,HSG B 1,526 98 Roofs,HSG B 6,335 77 Weighted Average 3,644 61 57.52%Pervious Area 2,691 98 42.48%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 2: Street Hydrograph z G Runoff 1.12 cfs MSE 24-hr 3 1- 100-Year Rainfall=7.49" Runoff Area=6,335 sf Runoff Volume=2,555 cf Runoff Depth=4.84" Tc=7.0 min CN=61/98 0 . 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 86 68 70 72 Time (hours) Appendix H Soils Data Soil Map—Washington County, Minnesota he 515E50 515870 515880 515990 515900 515910 45°Y 23'N _ :.: -: e t 45°Y 23"N $:s* sem. = m ":" a sJ '-. l.` #ak i . i... .. ,.. 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"tU44- itl, 4 - W F 62nd St N — _ i FC 1 ....,' ;,41::: § T-.: om` IF 4 . ,., . .s _..,,,,,,_..._ ,..„.... „.. .., ' [vua� nasi va id a is cable,. — d u �w 45°Y20'N i :r _ ,.. 45°2'20'N 515880 515370 5151 515330 51590D 515910 3 3 N ^o meters Map Sole:1:420 t premed on A portrait(8.5"x 11")stleei r e P8.), N 0 5 10 20 3) A0 20 40 83 120 Map projection:Web Mercator Came marinates:WC584 Edg tics:11TN Zee 1SN W(84 1_,17° Natural Resources Web Soil Survey 11/15/2022 Conservation Service National Cooperative Soil Survey Page 1 of 3 Map Unit Description:Urban land-Chetek complex,3 to 15 percent slopes--Washington County,Minnesota Washington County, Minnesota 858C—Urban land-Chetek complex, 3 to 15 percent slopes Map Unit Setting National map unit symbol: 1t96g Elevation: 800 to 1,950 feet Mean annual precipitation: 28 to 36 inches Mean annual air temperature: 39 to 48 degrees F Frost-free period: 120 to 170 days Farmland classification: Not prime farmland Map Unit Composition Urban land:65 percent Chetek and similar soils: 35 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Urban Land Setting Landform: Outwash plains Landform position(two-dimensional): Shoulder Down-slope shape: Convex Across-slope shape: Convex Interpretive groups Land capability classification (irrigated): None specified Forage suitability group: Not Suited (G090XN024MN) Other vegetative classification: Not Suited (G090XN024MN) Hydric soil rating: No Description of Chetek Setting Landform: Outwash plains Landform position(two-dimensional): Shoulder Down-slope shape: Convex Across-slope shape: Convex Parent material: Outwash Typical profile Ap-0 to 6 inches: sandy loam Bt- 6 to 18 inches: gravelly sandy loam 2C- 18 to 60 inches: gravelly coarse sand Properties and qualities Slope: 3 to 15 percent Depth to restrictive feature: More than 80 inches Drainage class: Somewhat excessively drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches USDA Natural Resources Web Soil Survey 11/15/2022 41111111 Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Urban land-Chetek complex,3 to 15 percent slopes—Washington County,Minnesota Frequency of flooding: None Frequency of ponding: None Available water supply, 0 to 60 inches: Low(about 3.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification(nonirrigated): 4e Hydrologic Soil Group: A Ecological site: F090AY021 WI -Dry Loamy Upland Forage suitability group: Sandy(G090XN022MN) Other vegetative classification: Sandy (G090XN022MN) Hydric soil rating: No Data Source Information Soil Survey Area: Washington County, Minnesota Survey Area Data: Version 18, Sep 6, 2022 zSDA Natural Resources Web Soil Survey 11/15/2022 MN Conservation Service National Cooperative Soil Survey Page 2 of 2 z? id(#k// m o QL i :`s (vZv XZv W'3 Pa zF' =: U F o N F ���•yc hl Fr O c i. w �✓ ,E'go ui = 5 .11 1 g Nr-o Xro "€1_; °Z ow =Et eT� �] F o f N'^g X of �„w N ID V57' IA vt a os § '�3 Zo o CL QO Y /I T o m �Z o v _ a dr-�s r-tosOQ g NrUJ y il ! 8 L! i „i; rg: N lit a e I!, i W ; iiS1 l' "! ; / g .fi i : :M1i ^ TaF i!t2! 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Stantec 733 Marquette Avenue Suite 1000,Minneapolis MN 55402-2309 November 30, 2022 File: 193800151 Attention: Mr. Eric Johnson City of Oak Park Heights 14168 Oak Park Blvd. Oak Park Height, MN 55082 Reference: 15222 62"d Street—Utility, Stormwater Review Dear Eric: We have reviewed the Lot Line Adjustment Plan (Utility Plan) dated 11-22-2022 and the Stormwater Management Plan dated 11-29-2022 the property at 15222 62"d Street. 1. The utility plan shows the proposed sewer service connecting to the existing water stub and the proposed water service connecting to the existing sewer stub for Parcel 2. The plan needs to be revised to show the sewer and water services connecting to the appropriate stubs. The contours and drainage features on the utility plan need to be updated to conform to the stormwater management plan design dated 11-29-2022. 2. The stormwater management plan and proposed drainage design is acceptable. Please note that the certificates of survey submitted for the individual lots will need to show grading details in conformance with the proposed drainage plan. If you have any questions or require further information, please do not hesitate to contact me. Regards, Stantec Consulting Services Inc. 4_)1/1 Lee M. Mann, PF MN,WI,CA Principal Phone: 612-712-2085 Lee.M a n n @sta ntec.co rn Attachments: Lot Line Adjustment Plan(Utility Plan), Stormwater Management Plan c. file Julie Hultman, Building Official Andrew Kegley, Director of Public Works Scott Richards, City Planner Kevin Sandstrom, City Attorney Design with community in mind