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HomeMy WebLinkAboutReport 2Saddlebrook Traffic Context ,""_, 6OUfl!:v ~ry ).( I!'oul)t.lln Peak .. "-Urban Growth Nail Ufl4l ;V IflClOf9O"!!tad ~a -o Uik!!§ ~od large Riyarli ;./ 1I1f!!i!ffili Ler U Tribal ~nQIi P'!fcelli o Parl!li ~OQ' 6oIor Aarli!llIhQIQ!! (@inl 2008 e~Qf ~rli\1 P~ (!~Ifll c 1ft) i.e fI t II./7'rtI4NCE I "v Z TO -A. King County Saddlebrook Tr me Cont xt t""_1 ~~fY x MgunYlfll!liI~1 " Yrh1n gr9W!!l N@~ YIW! )/ 1!l!i~9!!f tad ~@!J o ~jI@1i ~fld ~r91 ~v@!'! ;V JtrllilM [j lrj~! yf\dl IJ fll I o l!i!rl!~ go, 60!9f AIlnlll!lJgtgt Itinl ~I!O' 60!~ ~rli!Il!~ IUlol - ~tc/f (W7t.ANCC't A/ ~J~ f).. SCJicbL )(. 81)$ 5' toP J KInsI County Saddl brook Tr ffle Cont xt -I Ilounty ~ry I - x ttIoooYlln J!Uk~ " Y~n ij rQ'lllth Afl!~ bill!! jo/ 1IlIj0000fatad Arl!a o y~.§ lind LIIrG!! fljV8f§ j./ IItraarn5 YlIf!IM o Trj~1 yf\d§ Ptr"1 15 o l!~rII § CffJ t.CH EWJ.t,££ 3 ~goll §9!9f ~rI@1 PIjgg (!lIn) r. AI 5£C>t'T· ! 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Bernardo, Surface Water Utility Engineer, x7248 Saddlebrook Plat-ADS BayFilter™ Adjustment 2012-04 SUBJECT: The City of Renton Surface Water Utility has completed review of the adjustment request from. DR Strong Consultant Engineer for the Saddle brook Plat in accordance with City adopted 2009 King County'Surface Water Design Manual (KCSWDM) and City Amendments to the 2009 KCSWDM. Our review of the information leads us to understand that the applicant's engineering is requesting an adjustment from the 2009 King County Surface Water Design Manual to core requirement #8), Water Quality. Our review of the information provided by the applicant engineer on October 16, 2012, provides the following findings: 1. The proposed project has not completed the process prelimimiryplat approval or SEPA review. 2. The site is located in two existing parcels (3664500260 and 3664500261) with a total area of 4.36 acres. Parcels are situated atop a ridge and discharges runoff into two sub-basins. An adjustment to Core Requirement 111, Discharge at the Natural Location was approved in December 11, 2012 allowing the project to collect much of the runoff from the project site (4.36 acres) and direct it to a single combined detention and water quality facility located in the west portion of the site. The adjustment request proposes to use the BayFilter'· System for Basic Water Quality treatment. The Washington State Department of Ecology has approved the BayFilter'· System for General Use Level Designation for Basic Water Quality treatment. Based on th~ information provided in the adjustment request, the BayFilter'· System for Basic Water Quality Treatment is approved with the following conditions: 1. The water quality design flow shall be as follows, whichever is applicable: a. Downstream offlow control facility: The full2-year pre-developed allowable rate release rate from the flow control facility. ---------------------------------------------------------- Ms. Henninger Page 2 013 October 31, 2012 2. The Storm Filter system shall be sized as described in the BayFilter'" Technical and Design Manual, and the designer shall select the result yielding the larger number of cartridges. 3. Pre-settling shall be provided per Section 6.5.1 of the 2009 KCSWDM, General Requirements for Media Filtration Facilities. 4. BayFilter'" systems shall be installed in such a manner that the flows exceeding the design flow rates are bypassed around the Bayfilter Water Quality treatment facility. An external bypass to handle flow exceeding the facility design sh'all be provided. 5. The following maximum flow rates per cartridge system is limited to the following: a. BayFilter Cartridge (BFC) Cartridge maximum flow rate of 0.7 gpm/sf. i. 30 gpm (0.067 cfs) per cartridge (43 sf filter area). ii. 26 inches in diameter and approximately 28.75 inches tall. 6. Media combinations for the BayFilter'· cartridges are limited to Silica Sand, Perlite, Zeolite, and Activated Alumina. All filters are limited to the 19" vertical component to the spiral filter layers. 7. Vaults used for the BayFilter'" System shall conform to the "Materials" and "Structural Stability" requirements specified in Section 5.3.3 of the 2009 KCWDM for detention vaults. 8. The BayFilter'· system must be installed in an area that is accessible to maintenance equipment. The maintenance of a BayFilter'· system requires a vacuum truck as well as the removal and replacement of the filter cartridges. The manhole covers, and/or access hatches ofthe BayFilter'· System must be placed in locations that can be easily reached by such a vehicle. 9. Access Requirements: a. Access consistent with City confined entry policy must be provided by either removable panels or other City approved accesses to allow for removal and . replacement of the BayFilter cartridges. Approved access details for the Storm Filter system may be used as example and are available in Reference Section 7C of the 2009 KCSWDM. b. Removable panels, if used, shall be at grade, have stainless steel lifting eyes, and weigh no more than 5 tons per panel. c. Access to the inflow and outlet cells must also be provided. d. Ladder access is required when vault height exceeds 4 feet. e. Structures and access covers shall be designed for HS20 traffic loading. f. Removable panel access for vault shall not be located within the street pavement section. 10. Installation of a BayFilter'· system shall follow the manufacturer's recommended procedures. H:\File 5ys\SWP ~ Surface Water Projects\SWP-27 -Surface Water Projects (CIP)\27-3129 Renton Stormwater Manual\ADJUSTMENTS\2012\2012-4 Sattlebrook Plat-bayfitter.doc\HBah ..... Ms. Henninger Page 3 of 3 October 31,2012 11. The Bay Filter'· system shall be inspected every six (6) months during the 2-year maintenance defect bond period following completion of construction and plat recording .. The owner is responsible for the maintenance of the Bay Filter'· system during the 2-year defect bod period. The City will maintain the facility after the two year maintenance and defect bond period expires. 12. When BayFilter exhibits flows below design levels, the system should be inspected and maintained as soon as practical. Replacing a Bay Filter cartridge should be considered at or above the level of the 4" collector pipes to the manifold. Maintenance procedures can be found in the BayFilter System Technical and Design Manual. The maintenance process comprises the removal and replacement of each BayFilter cartridge and the cleaning of the vault or manhole with a vacuum truck. 13. This is a conceptual approval for using the Bay Filter for Basic Water Quality Treatment. Further analysis and design calculations shall be included in the TIR for final approval. 14. The approval of this adjustment to use the BayFilter System for the Saddlebrook Plat does not authorize the use of the BayFilter System on future projects without prior approval from the City of Renton. 15.' The BayFilter system shall be installed in accordance with the approved drawings and shall not be located within City right-of-way or easements. Please note that the approval of this adjustment does not relieve the applicant from other city, state, or federal requirements. If you have any questions about this adjustment, please contact Hebe C. Bernardo or me. Attachments cc: Lys Hornsby, P.E., Utility Systems Director Kayren Kittrick, Development Engineering Supervisor Richard Marshal, Surface Water and,Water Maintenance Manager Vanessa Dolbee, Planner File H:\File Sys\SWP -Surface Water Projects\SWP-27 -Surface Water Projects (CIP)\27-3129 Renton $tormwater Manual\ADJUSTMENTS\2012\2012-4 Sattlebrook Plat-bayfilter.doc\HBah .' ~. r 1 I ... . . !EXIHIXBXT 20 ~@ cQJ cQJ 0 ®CQ) [[@@ll\ ~[[®DDmmD[(u@[[W ~D@~ PijJlb~k Hearing Vanessa IDol beep Senior [?~all1ner November, 13 2012 RENT~ AHEAD OF THE CURVE Brief Description • Located at 13430 & 13426 156th Avenue SE (aka Vesta Ave N E) • 4.35 acre site located within the RLD Comp Plan designation and the R-4 zoning classification. , .~" - [ID[JD@lf [Q)@~~[JD[p)liD@[fi) ,_ "..,. ..... "',""" ' .... 'VfIIn.:HWr' ~ ,.. ~'loC. ~ C. Jr.,.. .. ') ~ c .... ,...-· ... __ . ...... -j \MI j~i'~ i' e·G I ~·W'*: t I //.. i~ .. u" .,. ... "1'= = q .... " -\.. .." ... "'~ , . 0 -0 ./ " · I ., .. , ... -. '\ ... '':':'' ,// 6 ' .A..~ " t .--l - . \_ .......... ; ... ",.._. I , . .i{ _ ............. -....... - • .8U u .... _. ---1!JfLr-~' , ..... / ... ~ ........ .. /3 .' 12 _( 13 ..... _u. ,. ....... <. \. ..,.,..., "t' ~itlt: \\.. .,...... 4 J !, .......... t·unu.u .. , .... j . I I \'" W' -"~·-.~'1I1 . i t="~ .. 1IL,_ ... '-"._u_. ...... .~ I -... . %.... -I .:r":'::'~_'.---... .... ..... cpr -" ~ o o 14 lots (one stormwater tract) at a density of 3.86 dulac Ranging in lot size from 9,400 SF to 11,737 o The site currently is occupied by a SFR, mobile home and out buildings. The site has been used for live stock/horse pasture historically _.1:-.J,; ~/'(IIiArjliii':MriI_"-"'._"'-' '_.M~ ,~ !2f'J'T !IIlQ!' 0 _ .... -... = All structures would be removed ... .......--...... ....,. ...... _---....-... Exhibit 3 'RENTON AI-lEAD OF THE CURVE [IDCFO@lf [Q)@~~CFD~~D@01l o The site is primary ,------------'I/F:urv.;'/4 ..... SE;rnC71OH;;;;-'i7t4. mrOIlHSHlPiiN<UiP"E2J'7i'H. RARN;Vc1'~'55 <.fiW.~.M_:------pa stu re with 48 ":.1. EXHIBIT 4 ~ REN~ AHEAO OF THE CURVE i existing significant trees o 8 determined by the applicants Arborist to be dead and/or dangerous I 0 11 are in new .i roadways I i 0 8 proposed to be I . d retame o No critical areas' ------------------------------, .. [lli[f'O@lr [Q)@~~[f'O[p)~O@Ol) ~@Ol)~D o Access to all lots would be provided along a new public road identified herein as {(Road A". Road A would provide a connection between Vesta Avenue NE and Yakima Avenue NE. o The proposed lot size width and depth of all lots would be consistent with the R-4 Zone development standards. o Street trees are proposed along all frontages. RENTON IHIEAD OF THE. CURVE r [lli[f'D@q [W@~~[f'D~~D@[{i) ~@O'U~D o On October 15, 2012, the ERe issued a DNS-M which included 4 mitigation measures related to Geotechnical Recommendations and parks, traffic, and fire impact fees. A 14-day appeal period commenced on October 19, 2012 and ended on November 2, 2012. No appeals were filed. o No public comments or agency comments were received. RENT~ AHEAD OF THE CURVI~ r----- I [l)u@O-ODlJUDITU@uW [PO@~ &ITU@OW~O~ o The proposal is consistent with relevant Comprehensive Plan land Use and Community Design Element policies. o The proposal is compliant with all relevant zoning regulations if all conditions of approval are complied with: o The applicant has elected to utilize the impervious surface credit to meet minimum Flow Control BMP requirements per the KCSWDM; impervious area would be reduced to 45%/lot and shall be recorded .-=--- on the face of the plat. O~~~'" ---~~~ RENTON ~~N'tQ~ AHE/\D OF THE CURVE RENT~ AHEAD OF THE CURVE -- [p[?@O-OOlil)DU1l@)[?S'j [PD@)~ &U1l@)DS'j~D~ CG@U1l~D f. .~M lj-- EXHIBIT 6 4 .. .., .... F7ntfi_e ff td'rllo; U""_ The applicant submit a landscape plan depicting: o Street Trees -Along all frontages o 10 foot wide onsite landscape strips along all frontages. o o No trees are proposed in the onsite landscape strips along all frontages No shrubs are proposed in the on- site landscape strip along Road A Staff recommends approval of eliminating the requirement for trees in the on-site landscape strips along all frontages, the requirement for a mixture of shrubs and ground cover would still be required 1-., -1 . -WD"®OOfrullOO'U<IDfrW WO<ID~ &O'U<IDOW~D~ cg;©ITD~D o City's Urban Forester recommending that a larger sized tree be provided in place of the flowering pear trees along Road A. o 30 % of trees are required to be retained. The project contained a Arborist Report and tree retention worksheet. There appears to be an error in the provided Arborist report in determining the number of trees located on the subject site and located in the proposed right-of-way improvement area. To reconcile the error the applicant would be required to provide four replacement trees at 2-inch caliper. RENTON AHEAD OF THE CURVE ~'-" [P[I®DODiJi)Ouu@[JW lPD@U &uu@DW~D~ ~@UU~D o The following street improvements would be required: o Vesta Ave NE shall be a 5-foot bike lane, curb 17 feet from centerline of ROW, and an 8-foot planter strip and a 5-foot sidewalk. o Yakima Ave NE shall be 32 feet of pavement to allow for parking on both sides, curb 16 feet from centerline of ROW, then an 8-foot planter strip and a 5-foot sidewalk. o The new internal street shall connect to both Vesta Ave NE and Yakima Ave NE and shall have a 26-foot pavement section, allowing parking on one side, an 8- foot planter, and a 5-foot sidewalk in a 52-foot ___ d_edicated right-of-way. RE.NT~ AHE/\D OF TI-IE CURVE -1 · .... .... . 1 W[f@DDUlFODO'U@}[f'W wD@}~ &O'U@DW~D~ ~@O'U~D o The properties surrounding the subject site are single- family residences and are designated R-4 on the City's and zoning map o The proposal is similar to existing development patterns o However, the applicant has proposed to develop a storm drainage tract, Tract A, in the southwest corner of the site. o To increase compatibility with the neighborhood staff recommends a condition of approval that the applicant provide screening landscaping on the outside of the fence (if a fence is proposed) or along the perimeter of Tract A. RENT~ AHEAD OF THE CURVE r-----1 - &w@D-O@[Q)DDD~W @1f ~01J[Q)D~ ~@~WD~@~ o Police and Fire Prevention staff indicate that sufficient resources exist to furnish services to the proposed development. o It is anticipated that the Renton School District can accommodate any.additional students generated by this proposal at the following schools: Maplewood Elementary, McKnight Middle School and Hazen High School. o Water service will be provided by Water District #90. A water availability certificate will be required to be submitted to the City. o Extension of an 8-inch sewer main in the new roadways will be required. There is an existing 8" sewer main in Vesta Avenue NE and in Yakima Avenue NE. -REN~ AHEAD 01: THE CURVE iQ~W@D:O@[Q)DDD~~ @\f ~lliJ[Q)D~ ~@[[WD~@~ o The applicant submitted a Preliminary Drainage Report prepared by D.R. Strong Consulting Engineers. o An on-site a storm detention/water quality pond is propose. o The detention/water quality pond has been designed per the 2009 King County Surface Water Design Manual as amended by the City of Renton. o The applicant requested an adjustment to the requirement to discharge stormwater to one detention facility instead of the required two. o An approval of this request was granted by th.e City of Renton Surface Water Utility Supervisor on August 16, ~_ 2012, subject to seven conditions. O~~~& ~~ ~~~ RENTON ~~~ AIiEAD OF THE CURVE N 1------- -'~' -&w@oD@[0DDD~W @IJ ~QJJ[0D~ ~@[f'WD~@~ o Following the application for Preliminary Plat approval, the applicant requested a second adjustment to water quality, to utilize a BayFilter System for Basic Water Quality treatment. DOE has approved the system. o An approval of this request was granted by the City of Renton Surface Water Utility Supervisor on October 31, 2012, subject to 15 conditions. o Staff recommends· Condition #6 be amended to recognize the second adjustment request and its associated 15 conditions. RENT~ AHEAD OF THE CURVE --_. . 1 ,-' ~®~@OlfUOlfi)®OlJ@]~~D@OlJ o Staff recommends approva~ of the Saddlebrook PreUmmnary P~at~ subject to 6 conditions of approval. RENTON AHEAD OF THE CURVE ,