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HomeMy WebLinkAboutComments PWE 6/11/2008 Memorandum City of Springfield Date: To: June 11, 2008 Steve Hopkins, Urban Planner I A(, Date R~ceived' '-ll \ { Eric Walter, Civil Engineer Planner: SH 0- I I?RC2008-00036, Springfield Fire Station #16 From: Subject: I have reviewed the materials provided witp the subject application. The recommended fmdings and conditions outlined below are provided for your use in preparing the land-use decision. SANITARY SEWER Finding: Section 4.3-105.A of the SDC requires that sanitary sewers shall be installed to serve each new development and to connect developments to existing mains. Additionally, installation of sanitary sewers shall provide sufficient access for maintenance activities. Finding: Section 4.3-105.C of the SDC requires that proposed sewer systems shall include design consideration of additional development within the area as projected by the Metro Plan. Finding: Pursuant to Chapter 3.03.4.A of the City's Engineering Design Standards and Procedures Manual and Section 4.4 of Portland's Stormwater Management Manual, solid waste storage areas shall b.e covered and hydraulically isolated from potential stormwater runoff, and directed to the sanitary sewer system. Finding: The applicant is proposing to connect building with a new 8" lateral to an existing 8" sanitary sewer pipe running through the property as located approximately 140 ft. south of the northerly property line and is running east-west inside a public utility easement. Finding: The site utility plan submitted does not appear to indicate a'proposed sanitary sewer connection from the proposed building to the existing sanitary sewer. Condition: The applicant is proposing to connect a new building with a new 8" lateral to the existing 8" sanitary sewer pipe running through the property as indicated in above . . fmding; however, the plans do not indicate a connection to the building. Prior to final site plan approval, the applicant shall clearly show on plans a clear connection from building to the proposed 8" lateral. , STORMW A TER MANAGEMENT Finding: Section 4.3-110.8 of the SDC requires that the Approval Authority shall grant development approval only where adequate public and/or private stormwater management systems provisions have been made as determined by the Public Works Director,' consistent with the Engineering Design Standards and Procedures Manual (EDSPM). Finding: Section 4.3-110.D of the SDC requires that run-off from a development shall be directed to an approved stormwater management system with sufficient capacity to accept the discharge. Finding: Section 4.3-IIO.E of the SDC requires new developments to employ drainage managemen(pnictic~s}Whici[1mnimize the amount and rate of surface water run-off into "iere~i;;g-;treams, 'aha whit1\{Jj~omote water quality. Finding: To comply with Sections 4.3-IIO.D & E, stormwater runoff from the site will be directed into one vegetative infiltration swale and one vegetative infiltration basin and water quality catch-basins prior to discharge into the public system. The public system is located in 68th Place to the west and in Main Street to the north. The north infiltration basin will be primarily used for reduciitg storm water runoff to the public system and the south infiltration bio swale will be used primarily for storm water quality. Finding: The applicant"proposes one connection to Main Street, which is a drainage system owned by ODOT. The applicant will be required to obtain necessary approval and permits from ODOT for work proposed in Main St. including storm system modifications. Finding: The existing public stormwater system located in Main Street, to which the applicant proposes a connection, does have limited capacity. Preliminary modeling results from the City's updated Stormwater Master Plan identifY a capacity constraint in the public system downstream of the site. Finding: The applicant has turned in hydrologic storm water calculations for the post- developed 25-year storm event. However, peak flow rates for the existing condition were not identified in the drainage study. Storm water calculations for the existing site conditions will be needed to verifY the existing capacity demands from this site to the existing storm water system. The proposed results will be reviewed with the existing in order to determine development impacts. ' Finding: Due to the identified downstream capacity constraint, the infiltration systems proposed will be required to limit post-developed runoff to existing peak flow rates. Infiltration tests and geotechnical field test data showing compliance with EDSPM for the infiltration basins has not been submitted. / Finding: Federal and Oregon Department of Environmentai Quality (ODEQ) rules require the City's MS4 plan address six "Minimum Control Measures." Minimum Control Measure 5, "Post-Construction Stormwater Management for New Development and Redevelopment," applies to the proposed development. . Finding: Minimum Control Measure 5 requires the City of Springfield to develop, implement and enforce' a program to ensure the reduction of pollutants in stormwater runoff to the MEP. The City must also develop and implement strategies that include a combination of structural or non-structural Best Management Practices (BMPs) appropriated for the community. Finding: Minimum Control Measure 5 requires the City of Springfield use an ordinance or other regulatory mechanism to address post construction runoff from new and re- development projects to the extent' allowable under State law. Regulatory mechanisms used by the City-include the Springfield Development Code (SDC), the City's Engineering Design Standards and Procedures Manual (EDSPM) and the future StoTmwater Facilities . Master Plan (SFMP). Finding: As required in Section 4.3-] I O.E of the SDC, "a development shall be required to employ drainage management practices approved by the Public Works Director and consistent with Metro Plan policies and the Engineering Design Standards and Procedures Manual." Finding: Section 3.02 ofthe City's EDSPMstates the Public Works Department will accept, as interim design standards for stormwater quality, water quality facilities designed pursuant to the policies and procedures of either the City of Portland (BES), or the Clean Water Services (CWS). Finding.- Section 3.03.3.B of the City's EDSPM states all public and private development and redevelopment projects shall employ a system of one or more post-developed BMPs that in combination are designed to achieve at least a 70 percent reduction in the total suspended solids in the runoffgenerated by that development. Section 3.03.4.E of the ,manual requires a minimum of 50 percent of the non-building rooftop impervious area on a site shall be treated for storm water quality improvement using vegetative methods. Finding: To_myet the requirements of the City's MS4 permit, the Springfield Development Code, and the City's EDSPM, the applicant has proposed one private vegetative water quality infiltration swale and'one infiltration basin. An "erosion control" seed mix did not appear to be included on plans for both systems, The seed mix application rates have not been specified. Finding: The vegetation proposed for use in the swales will serve as the primary pollutant removal mechanism for the stormwater runoff, and will remove suspended solids and pollutants through the-processes of sedimentation and 'filtration. Satisfactory pollutant removal will occur only when the vegetation has been' fully established. ' Condition: Prior final site plan approval, the applicant Will be required to qbtain'necessary , approval and permits from ODOT for all work proposed along Main Street including storm water system modifications. . ' . . Condition: Prior to final site plan approval, the applicant shall submit complete storm water calculations addressing the following requirements: Storm water calc\llations showing the p~ak flow rates for the existing condition 25-year storm event shall be submitted, The ilPplicant shall ensure that post-develilped peak flow rates do not exceed existing peak flo\v rates. Condition: Prior to final site plan approval, additional supporting documentation will need to be submitted for the proposed infiltration swale and basin design. This documentation will need to address the following: Submit complete geotechnical field test data and supporting documentation showing compliance with EDSPM and Portland Design Manual requirements for infiltration basin design and testing. Storm water calculations shall clearly reference the testing reports and calculations shall show conformance'with the geoteclmical reports and data and EDSPM. Condition: Prior to approval of the final site plan, the applicant shall provide an operations and maintenance plan to the City for 'review to ensure the long-term maintenance and operation ofthe proposed infiltration basins and storm water quality catch basin. The plan should designate maintenance responsibility for operating and maintaining the system. Condition: Prior to [mal site plan approval, the applicant shall submit a proposed erosion control seed mix for ,both private vegetative water quality infiltration swale and basin. The seed mix shall meet the requirements of the City's interim design standards as required in Section 3.02 of the EDSPM. The City of Portland stormwater management manual may be referenced for design. Condition: To ensure a fully functioning water quality system and me'et objectives of Springfield's MS4 permit, the Springfield Development Code and the EDSPM, the proposed private vegetative water quality infiltration swale and basin shall be fuliy vegetated with all vegetation species established prior to approval of Final Occupancy. Alternatively, if this condition cannot be met, the applicant shall provide and maintain additional interim erosion controVwater quality measures acceptable to the Public Works Departrnentthat will suffice until such time as the swale vegetation becomes fully established. . PUBLIC STREETS. SIDEWALKS & IMPROVEMENT AGREEMENTS Finding: Both 68th Place' and Main Street frontages are already improved. No further conditions regarding street improvements or improvement agreement will be needed. UTILITIES. EASEMENTS AND RIGHTS OF'W AY , Finding: Section 4.3-130.A of the .Springfield Development Code requires each development area to be provided with a water system having sufficientlysized mains and lesser lines to furnish adequate supply'to the development and sufficient access for maintenance. Springfield Utility Board coordinates the design of the water system within Springfield city limits. The plans do show proposed locations and size of water lines.' Finding: Sectidn 4.3-140:A of the SDC requires applicants proposing developments make arrangements' with the City and each utility provider for the dedication of utility easements necessary to fully service the development or land beyond the development area. The J11inimum width for public utilitY easements adjacent to street rights of ways shall be 7 . feet. The minimum width for all other public utility easements shall be 7 feet. The Public Works Director may require a larger easement to allow for adequate maintenance. Finding: The applicant has proposed a 7 foot public utility easements along the frontage of 68th Place and Main Street, satisfYing Section 4.3-140.A of the SDC. ' . . Finding: The applicant has shown an 8" public sanitary pipe running through property; however, the plans do not indicate the required easement. . Condtion: Prior to final site p'lan approval, plans shall be, submitted showing that the existing 8" public sanitary sewer is located within a 14.ft. min. public sanitary sewer easement. In addition, if this easement is not existing, properly located, and/or recorded, then all necessary recorded documents for a proposed easement shall be submitted for City review and approval. OTHER Finding: Details I and 2 as.located on plan sheet C6.2 does not appear to reference the specific geotechnical report sections and necessary detailed construction requirements for ensuring.tJ:1e pavement will meet the minimum 80,000lb fire truck loading:. -+cOlldtion: Prior to final site plan approval, the geotechnical engineer of record taking responsible charge of the structural pavement design shali submit a conformance letter to the City stating the construction details (by ref~rence) meet his or her' pavement design requirements for the 80,000 lb load requirements. ' , FEES AND PERMITS SYSTEMS DEVELOPMENT CHARGE: Pay applicable Systems Development Charges when building permits are issued for developments within the City limits or within the Springfield Urban Growth Boundary. (The cost relates to the amount of increase in impervious surface area, transportation trip rates, and plumbing fixture units. Some exceptions apply to Springfield Urban Growth areas.) [Springfield Code Chapter II, Article II J Systems Development Charges (SDC's) will apply to the 'construction of buildings and site improvements within the subject site. The Charges will be based upon the rates in effect at the time of permit submittal for buildings or site improvements on each portion or phase of the development. SANIT ARy'SEWER IN-LIEU-OF-ASSESSMENT CHARGE: Pay a Sanitary Sewer In-Lieu-of-Assessment charge in addition to the regular connection fees if the property or portions of the property being developed have not previously been assessed or otherwise participated in the cost of a public sanitary sewer. Contact the Engineering Division to determine if In-Lieu-of-Assessment charge is applicable. [Ord 5584] PUBLIC INFRASTRUCTURE FEES: It is the responsibility of the private developer to fund the public infrastructure. OTHER CITY PERMITS: Encroachment Permit or Sewer Hookup Permit (working within right-of-way or public easements) example: new tap to the public storm or sanitary sewer, or adjusting a manhole. [The current rate is $] 35 for processing plus applicable fees and deposits] Land & Drainage Alteration Permits (LDAP). [Contact the Springfield Public Works Department @ 726-5849 for appropriate applications/requirements] ADDITIONAL PERMITS/APPROVALS MAYBE NE(:~~~ARY: . Metropolitan Wastewater Management Commission (Pump station, sanitiry sewers 24 inches or larger) . Lane County Facilities Permit (If the project is within Lane County jurisdiction) . Railroad (Ifthe project crosses a railroad) . Orego'n Department of Transportation (If the project is ~thin ODOT jurisdiction) . Division of State Lands (Storm water discharge, wetlands) . Oregon Department of Environmental Quality (Erosion control (5 acres or greater), pump station, storm water discharge, wetlands) . U.S. Army Corps of Engineers (Storm wliter disch~ge, wetlands) -.) .-. . ~, , . , r