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HomeMy WebLinkAboutSR_ERC_Hazen_565_Zone_Reservoir_CUP_070326STAFF REPORT City of Renton Department of Planning / Building / Public Works ENVIRONMENTAL REVIEW COMMITTEE REPORT A. BACKGROUND ERC MEETING DATE Project Name: Applicant/Contact: File Number: Project Manager: Project Description: Project Location: Exist. Bldg. Area gsf." Site Area: RECOMMENDA TION: Project Location Map March 26, 2007 Hazen 565 Zone Reservoir Tom Malphrus, City of Renton 1055 S Grady Way, Renton, WA 98055 LUA-07-021, CU-H, V-H, ECF Jill K. Ding, Senior Planner The applicant is requesting Hearing Examiner Conditional Use Permit approval, a Height Variance, and Environmental (SEPA) Review for the construction of a 1.17 million gallon water reservoir on a 9.3 acre parcel located within the Residential - 8 (R-8) dwelling unit per acre zoning designation. The proposed reservoir will have a diameter of 80 feet and a height of 128 feet. A variance is requested to exceed the maximum height of 30 feet permitted in the R-8 zone. Honey Creek (a class 4 stream), wetlands, and steep slopes are located on the project site. All work would be outside of the required critical areas and their buffers. The project site would be screened from surrounding properties through the retention of existing trees and the installation of new landscaping. Access to the site is proposed off of SE 112th Street. (Project description continued on page 2). South of NE Sunset Blvd, west of 142"" Avenue SE (parcel no. 032305-9061) N/Z 406,850 square feet Proposed New Bldg. Area: 1.17 million gallon reservoir Total Building Area gsf: 1.17 million gallon reservoir Staff recommends that the Environmental Review Committee issue a Determination of Non-Significance (ONS). LUA07-021ercrpldoc PROJECT DESCRIPTION CONTINUED: The proposed reservoir would provide additional potable water storage in the City of Renton water supply system's 565-pressure zone. Currently the system has 750,000 gallons of storage capacity in the 565- pressure zone. The proposed reservoir will add an additional 1.17 million gallons of storage to this zone. Water stored in the reservoir will be available for fire fighting and commercial, industrial, and domestic consumption. The proposed reservoir will be a steel, stand pipe style water reservoir. The proposed reservoir will provided the following benefits to the City of Renton: 1. Increase system reliability by providing a second reservoir in the 565-pressure zone. 2. Increase volume of storage in the 565-pressure zone to meet equalizing fire and standby storage requirements in accordance with Department of Heath Water System Design Standards. 3. Provide the ability to remove either of the reservoirs from service for inspection or maintenance without interrupting or reducing the level of service to customers in the zone. 4. Improve water pressure in several areas within the 565-pressure zone. 5. Provide additional storage to meet higher water demands in the 565-pressure zone in the future. A reservoir overHow pond will be constructed to handle overflow from the reservoir. The pond will also act as a stormwater detention pond for the minimal amount of stormwater anticipated to be generated from the proposed impervious surfaces. B. RECOMMENDA TION Based on analysis of probable impacts from the proposal, staff recommends that the Responsible Officials make the following Environmental Determination: DETERMINA TION OF XX NON-SIGNIFICANCE XX Issue DNS with 14 da A eal Period. Issue DNS with 15 day Comment Period with Concurrent 14 day Appeal Period. C. ENVIRONMENTAL IMPACTS DETERMINA TlON OF NON -SIGNIFICANCE -MITIGA TED. Issue DNS-M with 14 da A eal Period. Issue DNS-M with 15 day Comment Period with Concurrent 14 day Appeal Period. In compliance with RCW 43.21 C. 240, the foJ/owing project environmental review addresses only those project impacts that are not adequately addressed under existing development standards and environmental regulations. 1. Earth Impacts: The topography of the portion of the project site located to the south of Honey Creek slopes down towards the north at an approximate grade of 7 percent. The topography of the portion of the project site located north of Honey Creek slopes down towards the south at an approximate slope of 8 percent. The slopes are the greatest near Honey Creek. Some localized slopes in excess of 40 percent are located near the creek; however the majority of the slopes in this area fall within the 15 to 25 percent range. Slopes that range from 25 to 39.9 percent qualify as sensitive slopes and slopes that exceed 40 percent qualify as protected slopes. No development is permitted on protected slope areas. The proposed water reservoir would be located in excess of 350 feet from the protected slope area. The topography in the immediate vicinity of the proposed water reservoir is relatively flat with an approximate slope of 4 percent. A Geotechnical Report prepared by GeoEngineers dated October 15, 2004 was submitted with the project application. Four borings were conducted on the project site. The report identified 1 to 1 Yo feet of forest duff and topsoil containing significant amounts of organic material at the surface in each of the borings. The surficial forest duff and topsoil was typically underlain by approximately 15 to 20 feet of medium stiff to hard silt and clay containing occasional thin sand lenses in borings 1, 2, and 4. In boring 3 layers of silt and clay with interbedded layers of silty sand extended down to about 33 feet below the surface. The silt and clay was typically underlain by dense to very dense sand with variable silt content and occasional layers of silt and gravel. Borings 1-3 were terminated in very dense silty sand at depths in excess of 40 feet and boring 4 terminated in a layer of very stiff silt at a depth of 41 feet. Project Location Map LUA07-021ercrptdoc City of Renton P/B/PW Department Mt Olivet Power Generation Faci/it REPORT AUGUST 21, 2006 )mental Review Committee Staff Report LUA-06-083, SA-H, ECF, V-H Page 3 or5 The report concluded that the project site could adequately accommodate the proposed development and provided recommendations regarding earthquake engineering, earthwork, shallow foundations, deep foundations, and drainage, Mitigation Measures: The recommendations provided in the submitted Geotechnical Report are self mitigating, no further mitigation is recommended. Nexus: N/A 2, Water -Stormwater Impacts: A Technical Information Report prepared by RH2 Engineers, dated Winter 2007 was submitted with the project application. According to the report the existing surface water runoff sheet flows across the site into Honey Creek. The submitted TIR was prepared in accordance with the 2005 King County Surface Water Design Manual. The proposed method of surface water runoff control is a stormwater pond. The proposed pond's capacity is 46,200 cubic feet before an overflow device in the control structure is used within the pond. The pond storage used to meet the minimum stormwater requirements is approximately 16,300 cubic feet for the 50-year design event. This leaves approximately 29,900 cubic feet of storage available in the pond for a reservoir overflow even that could occur during the 50-year design storm, Staff from the City's plan review section have reviewed the report and note that the report was prepared in compliance with the 2005 King County Surface Water Design Manual. Mitigation Measures: The proposal to design control runoff from the project site in accordance with the 2005 King County Surface Water Design Manual would result in a higher level of runoff control than required by the adopted 1990 King County Surface Water Design Manual. The proposal to utilize a higher requirement for stormwater runoff control is self mitigating, therefore no further mitigation is recommended. Nexus: N/A 3, Water -StreamiWetlands Impacts: A Wetland and Stream Reconnaissance Report prepared by RH2 Engineering, dated February 2007 was submitted with the project application. The report identifies a Class 4 stream (Honey Creek), and a Category 2 wetland. A class 4 stream requires a 35-foot buffer and a category 2 wetland requires a 50-foot buffer. No work is proposed within 400 feet of the wetland or stream buffers. Mitigation Measures: None recommended Nexus: N/A 4. Plants The subject site is largely forested. The construction of the proposed reservoir would result in the removal of 84 trees or 30 percent from the project site. Mitigation: No further mitigation is recommended Nexus: N/A E. COMMENTS OF REVIEWING DEPARTMENTS The proposal has been circulated to City Departmental/DivisIonal Reviewers for their review. Where applicable, these comments have been incorporated into the text of this report as Mitigation Measures and/or Notes to Applicant, 1.-Copies of al/ Review Comments are contained In the Official File. __ Copies of al/ Review Comments are attached to this report. Environmental Determination Appeal Process Appeals of the environmental determination must be filed in writing on or before 5:00 PM April 16,2007. Appeals must be filed in writing together with the required $75.00 application fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98055. Appeals to the Examiner are governed by City of Renton Municipal Code Section 4-8-110.B. Additional information regarding the appeal process may be obtained from the Renton City Clerk's Office, (425) 430-6510. LUA07·021ercrpt.doc City of Renton PIB/PW Department Mt. Olivet Power Generation Facilit REPORT AUGUST 21, 2006 Advisory Notes to Applicant: .mental Review Committee Staff Report LUA-06-083, SA-H, ECF, V-H Page 4 or5 The following notes are supplemental information provided in conjunction with the environmental determination. Because these notes are provided as information only, they are not subject to the appeal process for environmental determinations. Planning 1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless otherwise approved by the Development Services Division. 2. Commercial, multi-family, new single family and other nonresidential construction activities shall be restricted to the hours between seven o'clock (7:00) a.m. and eight o'clock (8:00) p.m., Monday through Friday. Work on Saturdays shall be restricted to the hours between nine o'clock (9:00) a.m. and eight o'clock (8:00) p.m. No work shall be permitted on Sundays. 3. Within thirty (30) days of completion of grading work, the applicant shall hydroseed or plant an appropriate ground cover over any portion of the site that is graded or cleared of vegetation and where no further construction work will occur within ninety (90) days. Alternative measures such as mUlch, sodding, or plastic covering as specified in the current King County Surface Water Management Design Manual as adopted by the City of Renton may be proposed between the dates of November 1st and March 31st of each year. The Development Services Division's approval of this work is required prior to final inspection and approval of the permit. Fire 1. Fire department access roadways are required, roadway is a minimum 20 feet in width with a turning radius of 45 feet outside and 25 feet inside. Plan Review -Water 1. All fire hydrants must be capable of delivering a minimum of 1 ,000 GPM. Plan Review -Surface Water 1. Note that any reservoir discharge to the waters of the State (Honey Creek) as a result of either an emergency overfow conditions or as planned maintenance shall be dechlorinated. Plan Review -Transportation 1. Per City of Renton code the project shall install curb, gutter and sidewalks and provide full pavement width per the standards and street lighting along the full frontage of the parcel being developed in Sunset Blvd. 2. Per code the project shall install cub, gutter, sidewalk and street lights in NE 12th St. The project may apply to pay a fee in lieu of or apply for a waiver for these improvements in NE 12th St. The minimum fire department requirement still applies. 3. Additional 30 foot right-of-way dedication along Sunset Blvd right-of-way will be required to be dedicated as a requirement of this project. The existing 60 ' right-of-way on Sunset at this location does not meet the requirements for a principal arterial. The resulting 90' (60' existing plus the 30' new dedication) will match the existing right-of-way along the south side of Sunset Blvd east of Hoquiam. Because the north side of Sunset is currently developed up to the north right-of-way line, the future widening of Sunset to 5 lanes that is planned by WSDOT will have to occur to the south within the ultimate 90' right-of-way. 4. All new electrical, phone and cable services and lines must be undergrounded. Construction of these franchise utilities must be inspected and approved by a City of Renton public works inspector prior to final inspection approval. Plan Review -Aquifer 1. The site is located in Aquifer Protection Zone 2 and may be subject to additional requirements per City code. Constructed secondary containment may be required if more than 20 gallons of regulated hazardous materials will be present at the new facility (RMC 4-3-050H2d(i)), A fill source statement (RMC 4-4-060L4) is required if more than 100 cubic yards of fill material will be imported to the project site. Construction Activity Standards (RMC 4-4-030C7) shall be followed if during construction, more than 20 gallons of hazardous materials will be stored on site or vehicles will be fueled on site. Surface Water Management Standards (RMC 4-6-030E2 and 3)-- Biofilters, stormwater conveyance, and water quality ponds may require a groundwater protection liner. Impervious surfaces shall be provided for areas subject to vehicular use or storage of chemicals. This is not intended to be a complete list of the APA reqUirements nor does this information substitute for the full ordinance, it is only intended to guide the applicant to the City of Renton code book. Plan Review -General 1. Submit a conceptual utility plan with the formal application. If you have any questions call me at 430-7298. LUA07 -021 ercrpt.doc City of Renton PIBfPW Department Mt Olivet Power Generation Facili REPORT AUGUST 21, 2006 lmenial Review Committee Staff Report LUA-06-083, SA-H, ECF, V-H Page 5015 2. All required utility, drainage and street improvements will require separate plan submittals prepared according to City of Renton drafting standards by a licensed Civil Engineer. 3. All plans shall be tied to a minimum of two of the City's current horizontal and vertical control plan. 4. Permit application must include an itemized cost estimate for these improvements. The fee for review and inspection of these improvements is 5% of the first $100,000 of the estimated construction costs; 4% of anything over $100,000 but less than $200,000, and 3% of anything over $200,000. Half of the fee must be paid upon application for building and construction permits, and the remainder when the permits are issued. There may be additional fees for water service related expenses. See Drafting Standards. LUA07 -021 ercrpl.doc -~ ® ® @ ® ® t C~ W lL . ~ f