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HomeMy WebLinkAboutPacket, DRC PLANNER 9/29/2021AGENDA DEVELOPMENT REVIEW COMMITTEE DEVELOPMENT SERVICES DEPARTMENT 225 FIFTH STREET Conference Room 616/ MS Teams Staff Review,• Tuesday, October12, 2021 9,•00-10,•00am, 1. Subdivision Tentative 811-21-000254-TYP2 811-19-000108-PROJ Vern Benson Assessor's Map: 17-02-33-41 TL: 1704 Address: 5642 A Street Existing Use: residential Applicant submitted plans for 5 -lot residential subdivision Planner: Andy Limbird Meeting: Tuesday, October 12, 2021 9:00 — 10:00 virtual meeting via Microsoft Teams The Complete DRC Packet for this meeting is available online for you to review or print out from the laserfiche website: htto://www.si)ringfield-or.gov/weblink8/browse.asi)x SITE T1 VICINITY MAP 811-21-000254-TYP2 Subdivision Tentative 17-02-33-41 TL 1704 5642 A Street Vern Benson City of Springfield Development & Public Works 225 Fifth Street Springfield, OR 97477 Land Division Tentative Plan Partition, Subdivision SPRINGIFIll w Application ,❑ Partition Tentative Pre -Submittal: ❑ Subdivision Tentative Pre -Submittal: Partition Tentative Submittal: Subdivision Tentative Submittal: Required Project Information (Applicant., complete this section) Applicant Name: Vern Benson Phone: 541-688-8977 Compan Fax: Address: CAC NYt C1 Applicant's Rep.: Eric Favreau Phone: 541-556-4425 Company: Favreau Engineering Fax: Address: 2206 Country Haven Dr, Eugene 97408 Property Owner: Vern Benson Phone: 541-688-8977 Company: Fax: Address: QJ0 ffiAN '1.40 ASSESSOR'S MAP NO: 17-02-33-41 TAX LOT NO(S): 01704 Property Address: 5642 A St Size of Property: 0.64 Acres © S uare Feet ❑ Proposed Name of Subdivision: 5Doves Description of If you are filling In this form by hand, please attach your proposal description to this application. Proposal: 5 lot single family subdivision with common driveway Existing Use: Single family dwelling # of Lots/Parcels: 5 Total acreage of parcels/ allowable density: 0.64 Propod # Dwellseunits 5 Signatures: Please si n and print your name and date in thea Required Project Information (City Intake Staff., Associated Applications: ro riate box on the next a e. complete this section) Signs: Pre -Sub Case No.: Date: Reviewed by: Case No. a k�-- C/7— Date:al 4.V Reviewed b Application Fee::$ �3� Technical Fee: $ qs w Posta a Fee: $ TOTAL FEES: r 12 • 2a 1 PROJECT NUMBER: Revised 1/7/14 kl 1 of 10 DEVELOPMENT AND PUBLIC WORKS SPRINGFIELD 225 FIFTH STREET �ORE60N SPRINGFIELD. OR 97477 PHONE. 541.726.3753 FAX: 541726.1021 wwmspdogfield-0r.gov STORMWATER MANAGEMENT SYSTEM SCOPE OF WORK ----------------------- (Arca Man, this line fa$ed nutty Applicant) ---------------------- ._________—_—_____ (Please return to Clayton McRachern @ City ofSpringlield Development and Public Works; Fax # 736-101 # 736-1036), emaibemeeachern@spring/ield-or.gov Project Name: Applicant: Assessors Parcel #: Date: Land Use(s): Phone #: Project Size (Acres): Fax #: Approx. Impervious Area: Email: Project Description (Include a copy of Assessor's map): Drainage Proposal (Public connection(s), discharge location(s), etc. Attach additional sheet(s) if necessary: Proposed Stormwater Best Management Practices: _____—__ (Area below this line 011ed out by the City a d Returned m the Applicant) -----------�-��- (At a minimum, all boxes checked by the City on the front and back of this sheet shall be submitted for an application to be complete f r submittal, although other requirements may be necessay) Drainage Study Type (EDSPM Section 4.03.2): (Note UH may be substituted for Rational Method) ❑ Small Site Study — (use Rational Method for calculations) ❑ Mid -Level Development Study —(use Unit Hydrograph Method for calculations) ❑ Full Drainage Development Study—(use Unit Hydrograph Method for calculations) Environmental Considerations: ❑ Wellhead Zone: ❑ Hillside Development: ❑ Wetland/Riparian: ❑ Floodway/Floodplain: ❑ Soil Type: ❑ Other .Jurisdictions Downstream Analysis: ❑ N/A ❑ Flow line for starting water surface elevation: ❑ Design HGL to use for starting water surface elevation: ❑ Manhole/Juncrion to take analysis to: Return to Clayton McEachern @ City of Springfield, email: cmceachem@springlield-or,gov, FAX: (541) 736-1021 COMPLETE STUDY ITEMS roromci uao omy: * Based upan the information provided on the front ofahi.s sheet, the following represents a minimum of amat is needed for an application to be complete for submittal with respect to drainage; however, this list should not be used in lieu of the Spring odor Development Code (SDC) or the Chic s Engineering Design Manual. Compliance with these requirements doer not constitute site approval; Additional site speck information may be required. Note.' Upon scoping sheet submittal, ensure completed fm -m has been signed in the space provided below: Interim Design Standards/Water uafi (EDSPM Chapter 3) Req'd N/A ❑ ❑ All non building rooftop (NBR) impervious surfaces shall be pre-treated (e.g. multi-chamhered catchbasm w/oil filtration media) for stormwater quality. Additionally, a minimum of 50 % of the NBR impervious surface shall be treated by vegetated methods. Where required, vegetative stormwatce design shall be consistent with design standards (EDSPM Section 3.02), set forth in Chapter 2 of the Eugene Stornwater Management Manual. n❑ For new NBR impervious area less than 15,000 square feet, a simplified design approach may be followed as specified by the Eugene Stmmwater Management Manual (Sec2A.1). ❑ ❑ if a stortmwater treatment swale is proposed, submit caleulatons/specifieztims for sizing, velocity, Dow, side slopes, bottom slope, and seed mix consistent with City of Springfield or Eugene's Samore ater. Management Manual. Water Quality calculations m required in Section 3.03.1 of the EDSPM. ❑ ❑ All building rooftop mounted equipment, or other fluid containing equipment located outside of the building, shall be mrovided with secondary containment it, wcath er resistant endmsnre. U U Drainage study prepared by a Professional Civil Engineer licensed in the state of Oregon. ❑ n A complete drainage study, as required in EDSPM Section 4.03.1, including a hydrological study map. ❑ D Calculations showing system capacity for a 2 -year storm event and overflow effects of a 25 -year storm event. The time of concentration (Tc) shall be determined using a 10 basins. U U A downstream drainage analysis as described in EDSPM Section 4.03A.C. On-site drainage shall be governed by the Oregon Plumbing Specialty Code (OPSC). ❑ F1 Elevations of the HGL and flow lines for both city and private systems where applicable. ❑ [:] Design of Sturm Systems (EDSPM Section 4.04). ❑ ❑ Flow lines, slopes, rho elevations, pipe type and sizes clearly indicated on the plan set. Minimum pipe cover shall be 18 inches for reinforced pipe and 36 inches for plain concrete and plastic pipe materials, or proper engineering calculations shall be provided when less. The cover shall be sufficient to support an 80,000 Ib load without failure of the pipe structure. RMaturing's "n" values for pipes shall be consistent with Table 4-1 of the EDSP. All storm pipes shall be designed to achieve a minimum velocit¢nf three f31 feet mer second at (1.5 nine. fill hosed an Tahla. 4-1 as me11 U U Existing and proposed contours, located at one foot interval. Include spot elevations and site grades showing how site drains. ❑ El Private somm ate, casements shall be clearly depicted on plans when private stonnwater flows from one property to another. Drywells shall not receive runoff from any surface w/o being treated by one or more BMPs, with die exception of residential building roofs (EDSP Section 3.03.4.A). Additional provisions apply to this as required by the DEQ. Refer to thewebsite: hfty/Hwww.deu.state.or.us/wl/uiduie.htm for more information. Detention ponds shall be designed to limit runoff to pre -development rates for the 2 through 25 -year storm events. *This form shall be included as an aflaehmeng inside the front cover, afthe stormwater study. *IMPORTANT: ENGLNEER PLEASE READ BELOwAND SIGKt As the engineer of record, i hereby certify the above required items are complete and included with the submitted stonnwater study and plan set. Signature Date Form Version 5: Jume 2015 Famau Engineering FUR E U 2206 Eugene, R 97408 (541) 556-4425 5 DOVES SUBDIVISION July 26, 2021 Assessor's Map: 17-02-33-41 Tax Lot 1704 Applicants: Vern Benson 940 Hwy. 99 North Eugene, OR 97402 Applicant's Representative: Favreau Engineering, LLC 2206 Country Haven Dr. Eugene, OR 97408 541-556-4425 Attn: Eric Favreau LAND USE REQUEST The applicant proposes to divide the subject 0.64 -acre property to create 5lots and to provide all necessary infrastructure to support the development. The proposed residential use and density (7.8 net dwelling units/acre) are consistentwith the existing Low Density Residential (LDR) zoning and the City's standards for development in the LDR zoning district, where a maximum of 10 dwelling units/acre is permitted. Duplex dwellings may be permitted only on corner lots in the LDR district, so no duplexes are permitted. The proposal does not include any public street creation, only the urbanization of the north side of A St along the frontage of the development site, which will be permitted through the PIP process. SITE AND SURROUNDING CHARACTERISTICS The site is within an established Springfield residential neighborhood. The property is located on the north side of A Street between 56' St. and 57' St. The northern, easterly and westerly property lines of the proposed subdivision abut residential neighborhoods. The mapped soil series is #32 -Coburg - Urban Land Complex. 5.12-125 Tentative Plan Criteria The Director shall approve or approve with conditions a Tentative Plan application upon determining that all applicable criteria have been satisfied. If conditions cannot be attached to satisfy the approval criteria, the Director shall deny the application. In the case of Partitions that involve the donation of land to a public agency, the Director maywaive any approval criteria upon determining the particular criterion can be addressed as part of a future development application. Page 1 of 4 Famau Engineering FUR E U 2206 CountaWn Or ugenery R 97408 (541) 556-4425 A The request conforms to the provisions of this Code pertaining to lot/parcel size and dimensions. Response: The proposed lots fronting the east -west streets meet the 4,500 sq. ft. minimum lot size and the 45 -foot street frontage requirements established by SDC. Lot 1 shall take access via an existing driveway to A Street. Lots 2 — 5 shall share a common driveway off of A Street. B. The zoning is consistent with the Metro Plan diagram and/or applicable Refinement Plan diagram, Plan District map, and Conceptual Development Plan. Response: The property is zoned Low Density Residential (LDR). The Metro Plan diagram for the subject property is LDR. C. Capacity requirements of public and private facilities, including but not limited to, water and electricity; sanitary sewer and stormwater management facilities; and streets and traffic safety controls shall not be exceeded and the public improvements shall be available to serve the site at the time of development, unless otherwise provided for by this Code and other applicable regulations. The Public Works Director or a utility provider shall determine capacity issues. Response: a. Water: The proposed development is within the Springfield city limits and will receive water service from the Springfield Utility Board (SUB). There is an existing 8" waterline in A Street. b. Wastewater: There is an existing 18" wastewater line in A St. which will service the entire subdivision. c. Storm Drain: There is an existing storm drain ditch on the north side of A Street. The developer is proposing to improve this ditch to accommodate for additional runoff created by thewidening of A St. The proposed common drivewaywill have a treatment swale on the west side and overflow into this drainage ditch on the north side of A St. Each lot will provide a soakage trench to accommodate all new structures. The soakage trenches for each lot have been designed and calculations for the soakage trenches and the treatment swale have been provided. d. Streets. The applicant is proposing to widen A St to a full paving width of 28 feet. In order to eliminate the creation of a concentrated flow, the applicant is not proposing curb and gutter, since there is no formal stormwater system in the vicinity of the development site. No curb and gutter exists on the north side of A St between 56' and 57' . The applicant is also proposing setback sidewalk along the development frontage, consistent with the City's requirements. Page 2 of 4 Favreau Engineering Count FUR E U 2206 Eugene, R 97408 (541) 556-4425 D. The proposed land division shall comply with all applicable public and private design and construction standards contained in this Code and other applicable regulations. Response: See Response to part C. E. Physical features, including, but not limited to: steep slopes with unstable soil or geologic conditions; areas with susceptibility of flooding; significant clusters of trees and shrubs; watercourses shown on the WQLW Map and their associated riparian areas; other riparian areas and wetlands specified in Section 4.3-117; rock outcroppings; open spaces; and areas of historic and/or archaeological significance, as may be specified in Section 3.3-900 or ORS 97.740-760, 358.905555 and 390.235-240, shall be protected as specified in this Code or in State or Federal law. Response: The Metro Area General Plan, Water Quality Limited Watercourse Map, State Designated Wetlands Map, Hydric Soils Map, Wellhead Protection Zone Map, FEMA Maps, and the list of Historic landmark sites have been consulted and there are no features needing to be protected or preserved on this site. If any artifacts are found during construction, there are state laws that could apply, ORS 97.740, ORS 358.905, ORS 390.235. If human remains are discovered during construction, it is a Class "C' felony to proceed under ORS 97.740. The site is relatively level and does not contain any waterways. Criterion 6 is met. Physical features, including but not limited to significant clusters of trees and shrubs, watercourses shown on the WQLW Map and their associated riparian areas, wetlands, rock outcroppings, and historic features have been evaluated and protected as required by this Code. F. Parking areas and ingress -egress points have been designed to: facilitate vehicular traffic, bicycle and pedestrian safety to avoid congestion; provide connectivity within the development area and to adjacent residential areas, transit stops, neighborhood activity centers, and commercial, industrial and public areas; minimize driveways on arterial and collector streets as specified in this Code or other applicable regulations and comply with the ODOT access management standards for State highways. Response: The applicant proposes to construct a common driveway as described in section C above. G. Development of any remainder of the property under the same ownership can be accomplished as specified in this Code. Response: There is no other adjoining property underthe same ownership that can be developed Page 3 of 4 Favreau Engineering Count FUR E U 2206 Eugene, R 97408 (541) 556-4425 H. Adjacent land can be developed or is provided access that will allow its development as specified in this Code. Response: Approval of the proposed subdivision will not impede development of adjacent land. I. Where the Partition of property that is outside of the city limits but within the City's urbanizable area and no concurrent annexation application is submitted, the standards specified below shall also apply. Response: This does not apply Page 4 of 4 Favreau Engineering 6 Country Haven Dr FURS U �a Eugene, OR 97409 (541) 556-4425 5 DOVES SUBDIVISION DRAINAGE STUDY May 7, 2021 The subject site is identified on County Assessors Maps as 17-02-33-41 TL 01704. It is located on the north side of A St between 561h and 57th St. A mobile home currently sits in the northeast corner of the site and is proposed to remain. The site is relatively flat and portions of the site drain to the south into an existing open channel on the north side of A St. The existing channel contains culverts at driveway crossings. The common driveway will be directed to a proposed filtration rain garden. The proposed rain garden has been sized per the City of Eugene Stormwater SIM form (see attached) and the design is shown on the plans. All lots will provide individual treatment of stormwater runoff. The sizing of these facilities will be determined during the building permit process. CONCLUSION Based on the attached calculations, the proposed drainage system has been sized appropriately. PRop ' AG 1 N E °�ss�0 2 ir C SO �° P rz,z° J F�Rra; tt/a/a FINISH GRADE N e. DRAIN ROCK WRAPPED IN FILTER FABRIC, NOT BOTFOM D $ D LENGTH =IT .•1 CATCH I WIDTH =9' SCB1236-L SOAKAGE TRENCH NOTES: 1. SOAKAGE TRENCH = 12'X 9'X TOR EQUIVALENT SQUARE FOOTAGE. 2. TOTAL IMPERVIOUS AREA DRAINED = 1,800 SQUARE FEET. 3. SEE THE CITY OF EUGENE STORMWATER MANAGEMENT MANUAL FOR ADDITIONAL INFORMATION. 4. FILTER FABRIC MUST BE ONE OF THE FOLLOWING TYPES/BRANDS: LINQ 125EX; LINO TYPAR3201; TNS E040; TNS R035; TNS R040; TNS R042; AMOCO 4535; MARAFI 140NL. 5. DRAINAGE ROCK SHALL BE A MINIMUM 2 1/2" TO 1 1/2" DRAIN ROCK. 6. THE PIPE WITHIN THE TRENCH SHALL EITHER BE PCV D2729 OR HDPE LEACH FIELD PIPE. 7. THE TRENCH BOTTOM IS TO BE INSTALLED LEVEL IN ALL DIRECTIONS. 8. BOTTOM OF FACILITY TO BE LOCATED WITHIN BAR RUN MATERIAL, WHICH WAS ENCOUNTERED APPROXIMATELY 4.5' DEEP DURING INFILTRATION TESTING. SOAKAGE TRENCH DESIGN FOR 5DOVES SUBDIVISION, SPRINGFIELD NO SCALE 5 DOVES SUBDIVISION SOAKAGE TRENCH DETAIL PR ��S���PDoarnE pFs`r�O w s � r O m 11 +c J.FAVBEP m� apVa DRAINAGE AREA = AVERAGE RUNOFF COEFFICIENT (C) _ LENGTH OF DRYWELL= WIDTH OF DRYWELL= DEPTH OF DRYWELL= VOID RATIO OF DRYWELL= AVERAGE PERMEABILITY OF SOIL = SURFACE AREA OF BOTTOM = SURFACE AREA OF SIDES = 1 , 1 EN�IVEER�IV� SOAKAGE TRENCH CALCULATIONS FOR 5 DOVES SUBDIVISION - EACH INDIVIDUAL LOT 1,800 SQ. FT.= 0.98 9 FEET 12 FEET 7 FEET 31% 2.00 INCHES/RR 108 SQ. FT. 294 SQ. FT. Favreau Engineering, LLC 2206 Country Haven Dr Eugene, OR 97408 (541)556-4425 0.041 ACRES See Infiftralion Report by: Attached OUTFLOW CAPACITY OF DRYWELL= 18.0 CU. FT./HR= 224 GALLONS PER MINUTE MAXIMUM STORAGE CAPACITY OF DRYWELL= 234.36 CU. FT. OF WATER DRYWELL VOLUME= 28.0 CUBIC YARDS 10YEAR TOTAL RECURRENCE RAINFALL TOTAL OUTFLOW DURATION DURATION RAINFALL DURING STORM EVENT FROM STORAGE OFSTORM OFSTORM INTENSITY STORM RUNOFF DRYWELL REQUIRED DRYWELL IN MINUTES IN HOURS IN/HR INCHES CU. FT. CU. FT. CU. FT. SIZING 5 0.0B 3.10 0.26 38 2 36 OK 10 0.17 2.10 0.35 51 3 48 OK 15 0.25 1.65 0.41 61 5 56 OK 20 0.33 1.40 0.47 69 6 63 OK 30 0.50 1.10 0.55 81 9 72 OK 60 1.00 0.70 0.70 103 18 85 OK 120 2.00 0.50 1.00 147 36 111 OK 180 3.00 0.44 1.32 194 54 140 OK 240 4.00 0.41 1.64 241 72 169 OK 360 6.00 0.36 2.16 318 10B 210 OK 480 8.00 0.32 2.56 376 144 232 OK 600 10.00 0.28 2.80 412 180 232 OK 720 12.00 0.25 3.00 441 216 225 OK 900 15.00 0.21 3.15 463 270 193 OK 1,080 18.00 0.20 3.60 529 324 205 OK 1,260 21.00 0.19 3.99 567 378 209 OK 1,440 24.00 0.18 4.32 635 432 203 OK �yED PROFS HG INFf `SS r. e7a77PE p �0y W rC�V OREGON 4 11 F FP• f2. �4 J 9fC 1. FAV PEP EXPR & 1213VZ Page 1 of 1 DRAINAGE AREA = AVERAGE RUNOFF COEFFICIENT (C) _ MAXIMUM DEPTH BOTTOM LENGTH OF FACILITY = BOTTOM WIDTH OF FACILITY= SIDE SLOPES = VOID RATIO = AVERAGE PERMEABILITY OF SOIL = SURFACE AREA OF BOTTOM = SURFACE AREA OF ZONE A = 1 , nnII//1 EN�NEERIVU FACILITY CALCULATIONS FOR 5 DOVES DRIVEWAY Favreau Engineering, LLC 2206 Country Haven Or Eugene, OR 97408 (541)556-4425 2,500 SQ. FT. = 0.057 ACRES 0.9B OSO FEET 50 FEET 3,5 FEET 3 FEET HORIZONTAL TO 1 FOOT VERTICAL 100% 2.00 INCHES/HR 175 SQ. FT. 345 SQ. FT. OUTFLOW CAPACITY OF FACILITY= 292 CU. FrJHR= 3.64 GALLONS PER MINUTE MAXIMUM STORAGE AT OVERFLOW= 130 CU. FT. OF WATER FACILITY VOLUME= 4.8 CUBIC YARDS 25 YEAR TOTAL RECURRENCE RAINFALL TOTAL OUTFLOW DURATION DURATION RAINFALL DURING STORM EVENT FROM STORAGE OFSTORM OFSTORM INTENSITY STORM RUNOFF FACILITY REQUIRED FACILITY IN MINUTES IN HOURS IN/HR INCHES CU. FT. CU. FT. CU. FT. SIZING 5 0.0B 3.45 0.29 59 3 55 OK 10 0.17 2.37 0.40 81 8 73 OK 15 0.25 1.90 0.4B 97 13 84 OK 20 0.33 1.56 0.52 106 17 89 OK 30 0.50 1.36 0.6B 139 29 110 OK 60 1.00 0.81 0.81 165 57 108 OK 120 2.00 0.56 1.12 229 115 114 OK 180 3.00 0.49 1.47 300 172 128 OK 240 4.00 0.44 1.76 359 230 130 OK 360 6.00 0.37 2.22 453 345 109 OK 480 8.00 0.34 2.72 555 459 96 OK 600 10.00 0.31 3.10 633 574 59 OK 720 12.00 0.28 3.36 686 689 EMPTY OK 900 15.00 0.25 3.75 766 861 EMPTY OK 1080 18.00 0.23 4.14 845 1,034 EMPTY OK 1260 21.00 0.22 4.62 943 1,206 EMPTY OK 1440 24.00 0.21 5.04 1,029 1,378 EMPTY OK *GIN N '-'qs 879T/PE H �b c� OREGON s �1 . F^. 12 , So o 9700. FAll't IEMWS 1213VM�1213VM Page 1 of 1