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Home My WebLink AboutApplication APPLICANT 5/4/2022DEVELOPMENT AND PUBLIC WORKS SPRINGFIELD 225 FIFTH STREET O REGON SPRINGFIELD, OR 97477 PHONE: 541.726.3753 FAX 541.726.1021 www.springfieldorgov STORMWATER MANAGEMENT SYSTEM SCOPE OF WORK -------------------------- (Area below this fine filed out by Applicant) ----- ---- ----- (Please return to Clayton McEachern @ City of Springfield Development and Public Works, F=# 736-1011, Phone # 736-1036), email.cmceachem@springfieldor.gov Project Name: Willamette Valley Oregon Temple Applicant: Shawn Salatino Assessors Parcel #: 1806-551, -569, -577, & -585 Date: 4/29/2022 Land Use(s): Commercial Development Phone #: 503-983-7906 Project Size (Acres): 10.2 Fax #: Na Approx. Impervious Area: 3.6 acres Email: shawn.salatino@kpff.com Project Description (Include a copy of Assessor's map): construction of a new 23,500 sf Temple Building. Site improvements include new parking stalls and drive aisles, pedestrian sidewalks, landscaped areas, covered bike parking, and two standalone buildings to the north of the site. The project also includes the consolidation of the above-mentioned parcels and a re -plat of the site. Drainage Proposal (Public connection(s), discharge location(s), etc. Attach additional sheet(s) if necessary: Stormwater runoff will drain away from the temple in all directions and be collected via a series of roof leaders, catch basins, trench drains and area drains. Public connections will be made on the west and east sides of the property to existing stormwater latera Mechanical treatment only allowed for pre treatment requirement. approved drop in catch basin filters are ok, on a site this big it might make more sense for long term maintenance cost to install a water quality manhole such as contech CDs or similar if there is a good concentration point to install one. Proposed Stormwater Best Management Practices: Water quality requirements will be met via City approved proprietary mechanical treatment technologies and a proposed rain garden facility. There is a regional detention facility located just north of the project site and no additional detention is proposed. although detention isn't required, the facilities should be optimized for infiltration, and this can result in a sizable storm wet — (Area below this line filed out by the City and Returned to the Applicant) - (At a minimum, all boxes checked by the City on the front and back ofthis sheet shall be submitted or an application to be complete for submittal, althou h other requirements may be necessary) Drainage Study Type (EDSPM Section 4.03.21: (Note. UH may be substituted for Rational Method) ❑ Small Site Study — (use Rational Method for calculations) ❑ Mid -Level Development Study — (use Unit Hydrogtaph Method for calculations) ❑✓ Full Drainage Development Study — (use Unit Hydrograph Method for calculations) Environmental Considerations: ❑✓ Wellhead Zone: within 1 -year and 5 -year ❑ Hillside Development: thin ❑ Wetland/Riparian: thio 0 Floodway/Floodplain: zone AE ❑✓ Soil Type: 26-chehalis silty clay loam, group B ❑ Other Jurisdictions n/a Downstream Analysis: ❑✓ N/A ❑ Flow line for starting water surface elevation: ❑ Design HGL to use for starting water surface elevation: ❑ Manhole/Junction to take analysis to: Return to Clayton McEachern @ City of Springfield, email., cmceachem@springfield-o ,goy, FAX: (541) 736-1021 COMPLETE STUDY ITEMS Fm Off al Uae Only: * Based upon the information provided on the front of this sheet, the following represents a minimum of what is neededfor an application to be complete far submittal with respect to drainage; however, this list should not be used in lieu ofthe Springfield Development Code (SDC) or the City's Engineering Design Manual. Compliance with these requirements does not constitute site approval; Additional site specific information may be required. Note: Upon stuping sheet submittal, ensure completed form has been signed in the space provided below: IInterim Design Standards(Water Quality (EDSPM Chapter 3) Req'd N/A All non -building rooftop (NBR) impervious surfaces shall be pre-treated (e.g. multi-chambered catchbasin w/oil filtration media) for sto rnwater quality. Additionally, a minimum of 50% of the NBR impervious surface shall be treated by vegetated methods. Where required, vegetative stormwater design shall be consistent with design standards (EDSPM Section 3.02), set forth in Chapter 2 of the Eugene Ston water Management Manual. ❑ For new NBR impervious area less than 15,000 square feet, a simplified design approach may be followed as specified by the Eugene Stormwater Management Manual (Sec2A.1). ❑ If a stormwater treatment swale is proposed, submit calculations/specifications for sizing, velocity, flow, side slopes, bottom slope, and seed mix consistent with City of Springfield or Eugene's Stormwater Management Manual. Water Quality calculations as 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 1�71/ Drainage study prepared by a Professional Civil Engineer licensed in the state of Oregon. i1/1' ❑ A complete drainage study, as required in EDSPM Section 4.03.1, including a hydrological study map. Calculations showing system capacity for a 2 -year storm event and overflow effects of a 25 -year storm event. F7 The time of concentration (Tc) shall be determined using a 10 minute start time for developed basins. iT U Existing and proposed contours, located at one foot interval. Include spot elevations and site grades showing how site i drains. ❑ Private moemwater easements shall be clearly depicted on plans when private stonnwater flows from one property to another. Drywalls shall not receive mnoff from any surface w/o being treated by one or more BMPs, with the exception of residential building roofs (EDSP Section 3.03.4.A). Additional provisions apply to this as required by the DEQ. Refer to the website: htm://www.deg.state.or.us/wg/uic/uie.htm for more information. 1/1 Detention ponds shall be designed to limit runoff to pre -development rates for the 2 through 25 -year storm events. % *This jurn, shall be included as an attachment, inside the front cover, of the storm"Wer study. "IMPORTANT: ENGINEER PLEASE READ BELOWAND SIGNl As the engineer of record, I hereby certify the above required items me complete and included with the submitted stormwater study and plan set. Signature 7/f^-Z� Date 5/4/22 Form Version 5: Jane 2015 A downstream drainage analysis as described in EDSPM Section 4.03.4.C. On-site drainage shall be governed by the Oregon Plumbing Specialty Code (OPSC). Elevations of the HGL and flow lines for both city and private systems where applicable. E] Design of Storm Systems (EDSPM Section 4.04). 1/1 . ❑ Flow lines, slopes, rim elevations, pipe type and sizes clearly indicated on the plan set. J�[J( F] 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 lb load without failure of the pipe structure. r� ( o❑ Manning's "n" values for pipes shall be consistent with Table 4-1 of the EDSP. All storm pipes shall be designed to iT U Existing and proposed contours, located at one foot interval. Include spot elevations and site grades showing how site i drains. ❑ Private moemwater easements shall be clearly depicted on plans when private stonnwater flows from one property to another. Drywalls shall not receive mnoff from any surface w/o being treated by one or more BMPs, with the exception of residential building roofs (EDSP Section 3.03.4.A). Additional provisions apply to this as required by the DEQ. Refer to the website: htm://www.deg.state.or.us/wg/uic/uie.htm for more information. 1/1 Detention ponds shall be designed to limit runoff to pre -development rates for the 2 through 25 -year storm events. % *This jurn, shall be included as an attachment, inside the front cover, of the storm"Wer study. "IMPORTANT: ENGINEER PLEASE READ BELOWAND SIGNl As the engineer of record, I hereby certify the above required items me complete and included with the submitted stormwater study and plan set. Signature 7/f^-Z� Date 5/4/22 Form Version 5: Jane 2015