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Home My WebLink About16055 - Allura at Tiffany Park (2) C_Original Redline Comments_170426.pdf This is a PDF package created by Bluebeam Revu and may contain both PDF and non-PDF files. In order to fully utilize the PDF package interface for accessing files, download and install Bluebeam Revu. Download now C_Response_Letter_Barghausen_170426.pdf April 26, 2017 ELECTRONIC DELIVERY VIA NEWFORMA Ann Fowler Development Engineering City of Renton Community and Economic Development 1055 South Grady Way Renton, WA 98057 RE: Revised Early Clear and Grade Plans Plat of Allura at Tiffany Park City of Renton File No. LUA13-001572 BCE Job No. 16055 Dear Ann: On behalf of MainVue WA LLC, we are resubmitting the Revised Early Clear and Grade Plans and SWPPP for the Plat of Allura at Tiffany Park. Enclosed are the following documents and drawings for your review: 1. One (1) electronic copy of the revised Early Clear and Grade drawings which include grading, TESC, tree retention, retaining wall, and wetland mitigation plans prepared by Barghausen Consulting Engineers, Inc. dated April 26, 2017 2. One (1) electronic copy of the final Construction SWPPP prepared by Barghausen Consulting Engineers, Inc. dated April 26, 2017 3. Original plan set redlined by the City of Renton, with comment responses for the Early Clear and Grade drawings dated April 14, 2017 Please review and contact me if you have any questions or need additional information. Thank you. Sincerely, Barry J. Talkington, P.E. Project Engineer BJT/ns/mf 16055c.019.doc enc: As Noted cc: Barbara Yarington, MainVue WA LLC Thomas A. Barghausen, Barghausen Consulting Engineers, Inc. Rob Gonia, Barghausen Consulting Engineers, Inc. CIVIL ENGINEERING, LAND PLANNING, SURVEYING 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES  TUMWATER, WA  KLAMATH FALLS, OR  LONG BEACH, CA  ROSEVILLE, CA  SAN DIEGO, CA www.barghausen.com P_Civil_Grading_Plans_170426.pdfLayout1 ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ Earth Solutions NWLLC EarthSolutionsNWLLC GeotechnicalEngineering,ConstructionMonitoring Sheet No. Proj.No. Drwn.By CheckedBy Date DateRevisions andEnvironmentalSciences Lock&LoadWallDesignandNo tes RESERVEATTIFFANYPARK Renton,Washington 3633 10/29/2014 KDH KDH LK1 DESIGNNOTES Reference: Barghausen Consulting Engineers, Inc., Site Plans, Dated October 8, 2014 Associated Earth Sciences, Inc., Subsurface Exploration, Geologic Hazard, and Limited Geotechnical Engineering Report, Dated September 28, 2012 The following design assumptions were used: Internal angle of friction for reinforced soil = 32 degrees (design only - see Materials Note “F”) Unit weight of reinforced soil = 125 pcf Maximum wall height = 18.67 feet Batter of wall = 1H : 10V Surcharges (WhereApplicable) =3000 plf Footing Strip Load 250 psf Uniform Soil Load 100 psf Traffic Live Load TECHNICALSPECIFICATIONS FORMECHANICALLYSTABILIZEDLOCK&LOAD RETAINING WALLS GENERAL A. The work involves the supply and installation of soil-reinforced retaining walls.The Concrete Panels and Counterforts will consist of Lock & Load Stone. Counterfort and Geogrid are the types of soil reinforcement.The work will include, but is not limited to: A-1 excavation to the grades shown on the civil drawings A-2 supply and installation of geogrid reinforcement A-3 supply and installation of drainage fill and piping A-4 supply and installation of segmental Lock & Load Stones A-5 supply and installation of retained and reinforced soil fill B. The walls shall be installed on undisturbed Native Soils or Structural Fill as appropriate. MATERIALS A. Concrete Panels and Counterforts are locked together to form a “Stone”.The retaining walls have been designed on the basis of Lock & Load Retaining Wall “Stones”. “Stones” are to be purchased from a licensed Lock & Load manufacturer. The Lock & Load trademark on each pallet identifies Lock & Load products. B. Information on the purchase of Lock & Load products can be obtained through: Lock & Load Retaining Walls Ltd. Tel. (877) 901-9990 Website: www.lock-load.com C. Geogrid - Structural geogrid reinforcement shall consist of Synteen SF-55 or Synteen SF-80, or an alternative as approved by the Geotechncial Engineer with a minimum long-term design strength of 2,740 lbs/ft and 4,137 lbs/ft, respectively. D. Drainage Fill - Drainage Fill placed around and above the perforated drainage pipe shall consist of round or angular 3/4 inch to 1 inch “clean” rock. E. Face Gravel - 3/4 inch clean crushed rock or approved equivalent by the Geotechnical Engineer. F. Reinforced and Retained Backfill - Suitable granular material approved by the Geotechnical Engineer. Fines shall not exceed 25 percent. G. Leveling Course -The Leveling Course shall consist of angular, crushed aggregate with maximum size of 3/4 inch.The Leveling Course Fill may be single size or may be wellgraded containing a maximum of 5% passing the #200 sieve. EXECUTION A. Contractor shall excavate to the lines and grades shown on the construction drawings. The Geotechnical Engineer should observe the excavation prior to the placement of the leveling material or fill soils. B. Over-excavation of deleterious soils or rock shall be replaced with material meeting the specifications described in Materials Section “F” above and compacted to 95% ofASTM D1557 (Modified Proctor) within 2% of optimum moisture content of the soil. C. The first course of concrete Lock & Load “Stones” shall be placed on the Leveling Course and the alignment and level shall be checked. D. “Stones” shall be placed with the top of the panel level and parallel to the wall face. The Counterfort Base shall be installed horizontal and perpendicular to the face of the retaining wall. E. Geogrid shall be oriented with the highest strength axis perpendicular to the wall alignment. F. Geogrid reinforcement shall be placed at the levels and to the lengths shown on the drawings beginning at the back of the Lock & Load Panels. G. The geogrid shall be laid horizontally in the direction perpendicular to the face of the retaining wall.The geogrid shall be pulled taut, free of wrinkles, and anchored prior to backfill placement on the geogrid. H. The geogrid reinforcement shall be continuous throughout respective embedment lengths. Spliced connection between shorter pieces of geogrid is not permitted. I. The drainage pipe discharge points shall be connected to approved discharge. J. Reinforced and Retained Backfill shall be placed, spread, and compacted in such a manner that minimizes the development of slack in the geogrid. K. Reinforced and Retained Backfill shall be placed and compacted in lifts not to exceed 8 inches where hand-compaction equipment is used and not more than 12 inches where heavy compaction equipment is used. Compaction should occur over the tail of the Counterfort prior to areas away from the retaining wall. Hand-operated vibratory plate compaction equipment (700 lbs. to 1,000 lbs.) shall be used to compact face gravel at wall face. L. Reinforced and Retained Backfill shall be compacted to 95% of the maximum density as determined byASTM D1557 (Modified Proctor) or equivalent.The moisture content of the backfill material prior to and during compaction shall be uniformly distributed throughout each layer and shall be within 2 percentage points of the optimum moisture content. M. Hand-operated compaction equipment (700 lbs. to 1,000 lbs.) shall be used within 26 inches of the front face of the concrete facing. N. Tracked construction equipment shall not be operated directly upon the geogrid reinforcement.Aminimum fill thickness of 6 inches is required prior to operation of tracked vehicles over the geogrid. O. Rubber tired equipment may pass over the geogrid reinforcement at speeds less than 10 mph. Sudden braking and sharp turning shall be avoided. P. At the end of each day of operation, the contractor shall slope the last lift of reinforced backfill away from the wall units to direct runoff away from the wall face. The contractor shall not allow surface runoff from adjacent areas to enter the wall construction site. NOTES 1. Wall alignment and heights to be established by contractor / surveyor. 2. Geotechnical Engineer to confirm Keyway stability, support characteristics, and overall global stability prior to construction. 3. Fences will be installed on top of all walls. Such fencing may include temporary safety fencing (chain link or equal) until permanent fences are installed. Permanent fences shall be no greater than six feet in height above the top of the wall and may be either solid wood, vinyl-clad chain link, or such other type as determined by the owner. GEOGRIDSCHEDULE Wall* Height (feet) Layers 1 2 3 4 5 6 7 8 9 10 4.00 5.33 6.67 8.00 9.33 10.67 12.00 13.33 14.67 16.00 17.33 18.67 A - - - - - - - - A A - - - - - - - A A - - - - - - - AAA- -----AAA- -----AAAA-----BAAA-----BAAAA----BAAAA----BBAAAA---BBAAAA---B B A A A A A - - GEOGRID: A = Synteen SF-55 B = Synteen SF-80 Geogrid Length (feet) 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 # of Panels 3 4 5 6 7 8 9 10 11 12 13 14 22" 16" 32" Outline of Connecting LoopFRONT VIEW 6.75" TOPVIEW Connecting Loop 6.75" 4.5" 1.6" 16" 1.25" 3.75" SIDE VIEW Poly Fiber Reinforced 1 1/2" fiber (4 lbs./yard) 6,000 psi concrete CastingTolerance NOTES: 1. Installation to be completed in accordance with manufacturer’s specifications. 2. Do not scale from drawings. LOCK&LOADPANEL NOT -TO - SCALE L LO OC CK K+ +L LO OA AD D L LO OC CK K+ +L LO OA AD D TOPVIEW SIDE VIEW FRONT FRONT BACK BACK NOTES: 1. Installation to be completed in accordance with manufacturer’s specifications. 2. Do not scale from drawings. LOCK&LOADCOUNTERFORT NOT -TO - SCALE REINFORCEMENT BAR BENDING DETAIL PICTORIALVIEW 6" 27" 3" 7.65" 4" 27" 6.75" 20.4" 90 80 90 1.6" 4.4" Finish Grade at Wall Face 16" (Min.) Wall Height H = 18.67' (Max.) TYPICALWALLSECTION NOT -TO - SCALE 2.67' (typ.) 4" Perforated Drainpipe Surround with 1 cf of Washed Rock per lineal foot of Pipe Reinforced Soil Retained Soils Retained Soils 4" - 6" Crushed Rock Leveling Course Geogrid Reinforcement (See Geogrid Schedule) 18" of Well-Compacted 3/4" Clean Crushed Rock Geogrid Layer 1 Geogrid Layer 2 Geogrid Layer 3 Geogrid Layer 4 (etc.) 6' - 0" (Max.) Fence (By Others) 2 1 24" (Min.)* NOTE: WallToe cover shall be 24" (Min.) for 2H:1V Sloping Condition in Front of Wall * NOTE: Geotechnical Engineer shall evaluate the need for Supplementary Drainage behind the Reinforcement Zone during Construction. 5' (Min.) Footing Setback Drainage Blanket (As Necessary per Geotechnical Engineer) 1 10 Reinforced Soil Mirafi 140N Filter Fabric (If Necessary per Geotechnical Engineer) Traffic Surcharge (WhereApplicable) Uniform Soil Surcharge (WhereApplicable)2H:1V (Max.) Slope Behind Wall 2 15' (Min.) Footing Setback Traffic Surcharge (WhereApplicable) Uniform Soil Surcharge (WhereApplicable)2H:1V (Max.) Slope Behind Wall Finish Grade at Wall Face 16" (Min.) Wall Height H = 6' (Max.) GRAVITYWALLCONDITION H=6' (MAX.) NOT -TO - SCALE 4" Perforated Drainpipe Surround with 1 cf of Washed Rock per lineal foot of Pipe Retained Soils 4" Crushed Rock Leveling Course 18" of Well-Compacted 3/4" Clean Crushed Rock 6' - 0" Max. Fence (By Others) NOTE: Geotechnical Engineer shall evaluate the need for Supplementary Drainage behind the Reinforcement Zone during Construction. Drainage Blanket (As Necessary per Geotechnical Engineer) Structural Fill or Competent Cut 1 10 R-3923_ _ _ TED-40-3923 OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OSOS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OS OSOS OS CORYLUS CORNUTA WESTERN HAZELNUT CORNUS STOLONIFERA RED TWIG DOGWOOD VINE MAPLE, 2 STEMS MINIMUM DOUGLAS FIR, UNCLIPPED OCEAN SPRAY ACER CIRCINATUM PSEUDOTSUGA MENZIESII SHRUBS HOLODISCUS DISCOLOR NUTKA ROSEROSA NUTKANA PLANT SCHEDULE WESTERN RED CEDARTHUJA PLICATA TREES SNOWBERRYSYMPHORICARPOS ALBUS MIN. SIZE 4' 5-6' 4-5' 24-36'' 24-36'' 24-36'' 24-36'' 18-24'' 54 69 87 20 50 116 8 24 THE PROJECT ECOLOGIST WILL OBSERVE SITE PREPARATION, GRADING AND PLANTING PHASES. CONSTRUCTION OVERSIGHT WILL BE PROVIDED FOR THE REMOVAL OF INVASIVES, NON-NATIVE PLANTS AND THE PROTECTION OF EXISTING VEGETATION TO REMAIN. EXISTING TREE ON SITE TO REMAIN. SPACINGCOMMON NAMEBOTANICAL NAMEQUANTITY SALMONBERRYRUBUS SPECTABLIS 18-24''125 5' 6' 6' 5' 4' 5' O.C. O.C. O.C. O.C. O.C. O.C. MINIMUM SIZE CONTAINER FOR SHRUBS IS 1 GAL, FOR TREES MINIMUM CONTAINER SIZE IS 2 GAL. PLANTINGS ARE NOT TO BE EXCESSIVELY ROOT BOUND NOTES: AS SHOWN AS SHOWNAS SHOWN NEIL BUCHANAN 206-522-2334 GHA LANDSCAPE ARCHITECTS PLANTING DESIGN BY: WETLAND/FOREST ECOLOGIST 206-772-6514 GARY SCHULZ OREGON GRAPEMAHONIA AQUIFOLIUM 24-36''121 6' O.C. TREE PROTECTION FENCE, SEE LANDSCAPE PLANS #..74##66+((#0;2#4- (+.'%1&' This MITIGATION PLAN is diagrammatic, all dimensions are approximate and must be field verified. 1'' = 20'-0'' 1 OS OS OS OS OS OS OS OS OS OS OS OS OSOS OS OS OS CORYLUS CORNUTA WESTERN HAZELNUT CORNUS STOLONIFERA RED TWIG DOGWOOD VINE MAPLE, 2 STEMS MINIMUM DOUGLAS FIR, UNCLIPPED OCEAN SPRAY ACER CIRCINATUM PSEUDOTSUGA MENZIESII SHRUBS HOLODISCUS DISCOLOR NUTKA ROSEROSA NUTKANA PLANT SCHEDULE WESTERN RED CEDARTHUJA PLICATA TREES SNOWBERRYSYMPHORICARPOS ALBUS MIN. SIZE 4' 5-6' 4-5' 24-36'' 24-36'' 24-36'' 24-36'' 18-24'' 54 69 87 20 50 116 8 24 THE PROJECT ECOLOGIST WILL OBSERVE SITE PREPARATION, GRADING AND PLANTING PHASES. CONSTRUCTION OVERSIGHT WILL BE PROVIDED FOR THE REMOVAL OF INVASIVES, NON-NATIVE PLANTS AND THE PROTECTION OF EXISTING VEGETATION TO REMAIN. EXISTING TREE ON SITE TO REMAIN. SPACINGCOMMON NAMEBOTANICAL NAMEQUANTITY SALMONBERRYRUBUS SPECTABLIS 18-24''125 5' 6' 6' 5' 4' 5' O.C. O.C. O.C. O.C. O.C. O.C. MINIMUM SIZE CONTAINER FOR SHRUBS IS 1 GAL, FOR TREES MINIMUM CONTAINER SIZE IS 2 GAL. PLANTINGS ARE NOT TO BE EXCESSIVELY ROOT BOUND NOTES: AS SHOWN AS SHOWNAS SHOWN NEIL BUCHANAN 206-522-2334 GHA LANDSCAPE ARCHITECTS PLANTING DESIGN BY: WETLAND/FOREST ECOLOGIST 206-772-6514 GARY SCHULZ OREGON GRAPEMAHONIA AQUIFOLIUM 24-36''121 6' O.C. TREE PROTECTION FENCE, SEE LANDSCAPE PLANS #..74##66+((#0;2#4- (+.'%1&' This MITIGATION PLAN is diagrammatic, all dimensions are approximate and must be field verified. 1'' = 20'-0'' 1'' = 20'-0'' 1 1'' = 20'-0'' 2 OS CORYLUS CORNUTA WESTERN HAZELNUT CORNUS STOLONIFERA RED TWIG DOGWOOD VINE MAPLE, 2 STEMS MINIMUM DOUGLAS FIR, UNCLIPPED OCEAN SPRAY ACER CIRCINATUM PSEUDOTSUGA MENZIESII SHRUBS HOLODISCUS DISCOLOR NUTKA ROSEROSA NUTKANA PLANT SCHEDULE WESTERN RED CEDARTHUJA PLICATA TREES SNOWBERRYSYMPHORICARPOS ALBUS MIN. SIZE 4' 5-6' 4-5' 24-36'' 24-36'' 24-36'' 24-36'' 18-24'' 54 69 87 20 50 116 8 24 THE PROJECT ECOLOGIST WILL OBSERVE SITE PREPARATION, GRADING AND PLANTING PHASES. CONSTRUCTION OVERSIGHT WILL BE PROVIDED FOR THE REMOVAL OF INVASIVES, NON-NATIVE PLANTS AND THE PROTECTION OF EXISTING VEGETATION TO REMAIN. EXISTING TREE ON SITE TO REMAIN. SPACINGCOMMON NAMEBOTANICAL NAMEQUANTITY SALMONBERRYRUBUS SPECTABLIS 18-24''125 5' 6' 6' 5' 4' 5' O.C. O.C. O.C. O.C. O.C. O.C. MINIMUM SIZE CONTAINER FOR SHRUBS IS 1 GAL, FOR TREES MINIMUM CONTAINER SIZE IS 2 GAL. PLANTINGS ARE NOT TO BE EXCESSIVELY ROOT BOUND NOTES: AS SHOWN AS SHOWNAS SHOWN NEIL BUCHANAN 206-522-2334 GHA LANDSCAPE ARCHITECTS PLANTING DESIGN BY: WETLAND/FOREST ECOLOGIST 206-772-6514 GARY SCHULZ OREGON GRAPEMAHONIA AQUIFOLIUM 24-36''121 6' O.C. TREE PROTECTION FENCE, SEE LANDSCAPE PLANS #..74##66+((#0;2#4- (+.'%1&' This MITIGATION PLAN is diagrammatic, all dimensions are approximate and must be field verified. 1'' = 20'-0'' 1 #..74##66+((#0;2#4- (+.'%1&' This MITIGATION PLAN is diagrammatic, all dimensions are approximate and must be field verified. FOLD BACK OR REMOVE TOP 1/3 OR BURPLAP IF B&B PLANT SHRUB PLANTING DETAIL THAN ROOTBALL FOR SHRUBS AND 8'' WIDER THAN ROOTBALL FOR GROUNDCOVERS DEPTH TO BE SAME AS ROOTBALL OR 12'' SECTION TO BE 12'' WIDER WHICH EVER IS GREATER PLANTING HOLE SET AT 1/2'' HIGHER THAN GROWN IN NURSERY FIRM BACKFILL IN PLACE AND WATER IN WELL N.T.S. EXISTING SOIL, DEEPLY SCARIFY AT SIDES OF KEEP MULCH 1-2'' AWAY FROM STEM BARK MULCH PER SPECIFICATIONS BACKFILL WITH AMENDED NATIVE SOIL AND FERTILIZER PER SPECIFICATIONS PLANT POCKET OF PLANT TOP OF ROOT CROWN FORM 2'' WATER BASIN (SEE NOTES REGARDING STAKING OF TREES) 3 TIMES ROOTBALL DIAMETER PLANTING HOLE 1'' WIDE SOFT RUBBER CHAIN LOCK TREE TIE WRAP AROUND EACH STAKE AND TREE PEEL BURLAP BACK FROM TOP 1/3 OF ROOTBALL SET AT 1/2'' HIGHER THAN GRADE AS GROWN IN NURSERY FIRM BACKFILL IN PLACE AND WATER IN WELL FORM 2'' WATERING BASIN AROUND TREE STAKE OUTSIDE OF ROOTBALL BACKFILL PER PLANT NOTES TREE PLANTING/STAKING DETAIL EXISTING SOIL 2'' DIA. STAKES LAYER OF MULCH SECTION 4'-0" N.T.S. R_SWPPP_170426.pdfMicrosoft Word - 16055.021.doc Construction Stormwater General Permit Stormwater Pollution Prevention Plan (SWPPP) for Allura at Tiffany Park Prepared for: The Washington State Department of Ecology Northwest Region, Bellevue Permittee / Owner Developer Operator / Contractor Mainvue WA, LLC Mainvue WA, LLC To be Determined S.E. 18th Street and 124th Pl S.E. Renton, WA Certified Erosion and Sediment Control Lead (CESCL) Name Organization Contact Phone Number Luke Thornton Barghausen Consulting Engineers, Inc. Office: (425) 251-6222 24-Hour: (206) 743-2328 SWPPP Prepared By Name Organization Contact Phone Number Barry Talkington Barghausen Consulting Engineers, Inc. (425) 251-6222 SWPPP Preparation Date April 26, 2017 Project Construction Dates Activity / Phase Start Date End Date To be Determined May 1, 2017 December 31, 2020 P a g e | 1 16055.021.doc Table of Contents 1 Project Information ........................................................ ......................................................... 4 1.1 Existing Conditions ......................................................................................................... 5 1.2 Proposed Construction Activities .................................................................................... 6 2 Construction Stormwater Best Management Practices (BMPs) ............................................ 8 2.1 The 12 Elements ............................................................................................................ 8 2.1.1 Element 1: Preserve Vegetation / Mark Clearing Limits .......................................... 8 2.1.2 Element 2: Establish Construction Access .................................................... .......... 9 2.1.3 Element 3: Control Flow Rates .............................................................................. 10 2.1.4 Element 4: Install Sediment Controls ......................... ........................................... 11 2.1.5 Element 5: Stabilize Soils ...................................................................................... 12 2.1.6 Element 6: Protect Slopes ..................................................................................... 14 2.1.7 Element 7: Protect Drain Inlets ..................................................... ......................... 15 2.1.8 Element 8: Stabilize Channels and Outlets ........................................................... 16 2.1.9 Element 9: Control Pollutants ....................... ......................................................... 17 2.1.10 Element 10: Control Dewatering ........................................................................... 24 2.1.11 Element 11: Maintain BMPs .................................................................................. 25 2.1.12 Element 12: Manage the Project ................................................ ........................... 26 3 Pollution Prevention Team ................................................................................................... 29 4 Monitoring and Sampling Requirements .............................................................................. 30 4.1 Site Inspection ................................................................................... ........................... 30 4.2 Stormwater Quality Sampling ....................................................................................... 30 4.2.1 Turbidity Sampling .................... ............................................................................. 30 4.2.2 pH Sampling .................................................................................................... ...... 32 5 Discharges to 303(d) or Total Maximum Daily Load (TMDL) Waterbodies ......................... 33 5.1 303(d) Listed Waterbodies ............................................................ ............................... 33 5.2 TMDL Waterbodies ....................................................................................................... 33 6 Reporting and Record Keeping ........................................................................................... 34 6.1 Record Keeping ............................................................................ ................................ 34 6.1.1 Site Log Book ........................................................................................................ 34 6.1.2 Records Retention ................................................................................................. 34 6.1.3 Updating the SWPPP ........................................................................ .................... 34 6.2 Reporting ...................................................................................................................... 35 6.2.1 Discharge Monitoring Reports ............................................................................... 35 6.2.2 Notification of Noncompliance ....................................................................... ........ 35 P a g e | 2 16055.021.doc List of Tables Table 1 – Summary of Site Pollutant Constituents .................................................................. 6 Table 2 – Pollutants .................................................................................................................. 17 Table 3 – pH-Modifying Sources ...................................... ....................................................... 23 Table 4 – Dewatering BMPs ..................................................................................................... 24 Table 5 – Management .............................................................................................................. 26 Table 6 – BMP Implementation Schedule ...................... ......................................................... 27 Table 7 – Team Information ..................................................................................................... 29 Table 8 – Turbidity Sampling Method ..................................................................................... 30 Table 9 – pH Sampling Method ......................................... ....................................................... 32 List of Appendices Appendix/Glossary A. Site Map B. BMP Detail C. Correspondence D. Site Inspection Form E. Construction Stormwater General Permit (CSWGP) F. 303(d) List Waterbodies / TMDL Waterbodies Information G. Contaminated Site Information H. Engineering Calculations P a g e | 3 16055.021.doc List of Acronyms and Abbreviations Acronym / Abbreviation Explanation 303(d) Section of the Clean Water Act pertaining to Impaired Waterbodies BFO Bellingham Field Office of the Department of Ecology BMP(s) Best Management Practice(s) CESCL Certified Erosion and Sediment Control Lead CO2 Carbon Dioxide CRO Central Regional Office of the Department of Ecology CSWGP Construction Stormwater General Permit CWA Clean Water Act DMR Discharge Monitoring Report DO Dissolved Oxygen Ecology Washington State Department of Ecology EPA United States Environmental Protection Agency ERO Eastern Regional Office of the Department of Ecology ERTS Environmental Report Tracking System ESC Erosion and Sediment Control GULD General Use Level Designation NPDES National Pollutant Discharge Elimination System NTU Nephelometric Turbidity Units NWRO Northwest Regional Office of the Department of Ecology pH Power of Hydrogen RCW Revised Code of Washington SPCC Spill Prevention, Control, and Countermeasure su Standard Units SWMMEW Stormwater Management Manual for Eastern Washington SWMMWW Stormwater Management Manual for Western Washington SWPPP Stormwater Pollution Prevention Plan TESC Temporary Erosion and Sediment Control SWRO Southwest Regional Office of the Department of Ecology TMDL Total Maximum Daily Load VFO Vancouver Field Office of the Department of Ecology WAC Washington Administrative Code WSDOT Washington Department of Transportation WWHM Western Washington Hydrology Model Tab 1.0 P a g e | 4 16055.021.doc 1 Project Information This Stormwater Pollution Prevention Plan (SWPPP) has been prepared per the requirements of the Washington State NPDES Construction Stormwater General Permit Conditions of Approval for the Allura at Tiffany park project in The City of Renton, Washington. The proposed Plat of Reserve at Tiffany Park is a single-family residential project consisting of 94 lots zoned R8. The project is 21.66 acres in size containing four tax parcels (212305-9044, 212305-9051, 212305-9054, and 212305-9061). The site is located at the dead end of S.E. 18th Street near the intersection of Monroe Avenue S.E. in a portion of Section 21, Township 23 North, Range 5 East, W.M., in the City of Renton. The site is polygonal in shape and ties into two existing road stubs. The first is located in the northwest corner of the site at the dead-end of S.E. 18th Street. The second road stub is located to the southwest of the site on the southern side of the Cedar River Pipeline at the dead-end of 124th Place S.E. These road stubs are to be tied into and will be extended into the site to provide public access and circulation. This site is undeveloped and is currently zoned R8; with a majority of the site being composed of second-growth forest. The elevations of the site range from 456 to 398. There are four wetlands located on site; three of them are Category 2, with one Category 3. The site is entirely surrounded by existing single family residences. Along the east property line is the Mercer Island Pipe Line R/W. Along the south boundary is the Cedar River Pipeline R/W. Access to the site from 124th Place S.E required the developer to an access easement through the Cedar River Pipeline R/W. On-site soils are mapped as mostly Alderwood, with a small portion along the southern boundary mapped as Arents. Please refer to the Soils Map in this section. All drainage calculations were modeled as till soils. The project will be constructing roadways consisting of curb and gutter, sidewalk, and street trees. The site will tie into the existing roads at the dead-ends of S.E. 18th Street and 124th Place S.E. All roads for this project have been designed to be 26 feet wide, with an 8-foot planter strip at the back of curb and a 5-foot sidewalk (both sides). Overall the proposed public right-of-way is to be 53 feet in width. The topography on site is gentle and rolling. The site generally slopes from east to west from elevation 456 to 398. The project will be mass graded with cuts and fills balanced on-site. The wetland areas will remain undisturbed along with portions of their buffers. Buffer averaging is proposed. Other portions of the site will remain undisturbed in an effort to preserve as many existing trees as possible. The drainage facilities are required to meet the requirements of the 2009 King County Surface Water Design Manual (KCSWDM) and the 2010 City of Renton Amendments to the KCSWDM. The drainage design shall meet at a minimum the Conservation Flow Control and Basic Water Quality Treatment. The drainage facility located in Tract A is a detention pond sized for Level 2 Flow Control. Water quality will be met by the use of a StormFilter for this project. The project will be discharging the drainage from the pond to the existing drainage system within S.E. 18th Street near the intersection of Lake Youngs Way SE. P a g e | 5 16055.021.doc Construction activities will include demolition, clearing & grading, roadwork, detention vault construction, StormFilter installation, stormwater conveyance installation, utilities installation, foundation excavation, home construction, driveway & patio construction, and landscaping. Construction is scheduled to begin on May 1, 2017 and estimated to be completed on December 31, 2022. The purpose of this SWPPP is to describe the proposed construction activities and all temporary and permanent erosion and sediment control (TESC) measures, pollution prevention measures, inspection/monitoring activities, and recordkeeping that will be implemented during the proposed construction project. The objectives of the SWPPP are to: 1. Implement Best Management Practices (BMPs) to prevent erosion and sediment, and to identify, reduce, eliminate or prevent stormwater contamination and water pollution from construction activity. 2. Prevent violations of surface water quality, ground water quality, or sediment management standards. 3. During the construction phase prevent adverse water quality impacts including, impacts of beneficial uses of the receiving water by controlling peak flow rates and volumes of stormwater runoff at the Permittee's outfalls and downstream of the outfalls. This SWPPP was prepared using the Ecology SWPPP Template downloaded from the Ecology website on January 1, 2016. The Template has been revised to incorporate all items in the General NPDES Permit as well as provide more project specific BMPs that will be utilized onsite. This SWPPP was prepared based on the requirements set forth in the Construction Stormwater General Permit, Stormwater Management Manual for Western Washington (SWMMWW 2012). The site project information for the site is summarized below. Project/Site Name: Allura at Tiffany Park Street/Location: the dead end of S.E. 18th Street near the intersection of Monroe Avenue S.E. City: Renton State: WA Zip code: 98058 Subdivision: Tiffany Park Receiving waterbody: Ginger Creek 1.1 Existing Conditions As previously mentioned, the total site area is approximately 21.66 acres in size. The site is currently unoccupied with no existing structures on site. The site is mostly composed of second-growth forest. The site generally slopes from east to west from elevation 456 to 398. There are four wetlands located on site; three of them are Category 2, with one Category 3. Based on the USDA Soils Map the site and surrounding area consist of Alderwood soils. The site is entirely surrounded by existing single family residences. Along the east property line is the Mercer Island Pipe Line R/W. Along the south boundary is the Cedar River Pipeline R/W. Generally, surface water runoff for the site flows in an westerly direction. In order to maintain existing site hydrology a detention vault will be used to control flow rates. Runoff will be treated for water quality by a StormFilter and released to the existing storm system at Lake Youngs Way S.E. the existing 18-inch concrete pipe turns south and conveys stormwater to the entrance of Tiffany Park Elementary. At this point runoff enters a detention system underneath the parking lot of the school and is discharged into a 60-inch diameter trunk line which P a g e | 6 16055.021.doc eventually discharged to the Headwaters of Ginger Creek. A site vicinity map is provided in Appendix A. The following summarizes the details of the existing site conditions: Total acreage: 21.66 Disturbed acreage: 18.06 Existing structures: None Landscape topography: Forested / Vegetated Drainage patterns: Runoff flows in an westerly fassion to the neighbouring properties Existing Vegetation: Alderwood Soils w/ regional trees and shrubs Critical Areas (wetlands, streams, high erosion risk, steep or difficult to stabilize slopes): Three Category 2 Wetlands and one Category 3 Wetland List of known impairments for 303(d) listed or Total Maximum Daily Load (TMDL) for the receiving waterbody: None Table 1 includes a list of suspected and/or known contaminants associated with the construction activity. Table 1 – Summary of Site Pollutant Constituents Constituent (Pollutant) Location Depth Concentration N/A N/A N/A N/A 1.2 Proposed Construction Activities The site will be cleared according to the T.E.S.C. and Grading Plans. The permanent stormwater facility will be built according to the Road and Drainage Plans. The proposed development includes site development and eventual home construction of 94 residential lots for single family residences and roadways. A system of pipes and catch basins will be installed to convey stormwater runoff from the developed site and any onsite contributing basin areas to the Detention and Water Quality facility located in Tract A. The facility in this tract has been design to provide the required water quality and detain the storm water for a 100-year storm event. The site will be constructed in two phases, the Site Development Phase and the Vertical Construction Phase. The site development construction phase includes the following activities: Clearing & Grubbing, Demolition, Sediment Pond, Mass Grading/Site Grading, Infrastructure (utilities, curb and gutter, sidewalks, drives, etc.), and paving operations. P a g e | 7 16055.021.doc Lot areas with flat pads are being created for the vertical construction phase to take place upon. The vertical construction phase includes the following activities: Landscape and Irrigation, Home Construction/Vertical, and Final Stabilization. The proposed residences will be located on Lots 1 through 94. Each lot will have an accompanying driveway, patio, walkways, and typical residential landscaping. In the developed condition stormwater runoff will be routed the onsite detention pond in Tract A. The facility in this tract has been design to provide the required water quality and detention rates for a 100-year storm event. In the developed condition the site will be mostly developed. All nonimpervious surfaces will be vegetated with a variety of local shrubs and grass. Contaminated Site Information: There are no activities that will result in the contamination of soil and or groundwater planned for the site during clearing, grading, and/or the construction of the single family residences. Tab 2.0 P a g e | 8 16055.021.doc 2 Construction Stormwater Best Management Practices (BMPs) The following sections describe BMPs that will be utilized during the construction of the project. Alternate BMPs for the 12 BMP Elements may be implemented on a need by need basis, should the 12 Elements below be deemed ineffective or inappropriate during the construction to satisfy the requirements set forth in the General NPDES Permit. To avoid potential erosion and sediment control issues that may cause violation(s) of the NPDES Construction Stormwater permit, the Certified Erosion and Sediment Control Lead will promptly initiate the implementation of one or more alternate BMPs after the first sign that existing BMPs are ineffective or failing. The SWPPP is a living document reflecting current conditions and changes throughout the life of the project. These changes may be informal (i.e., hand-written notes and deletions). Update the SWPPP when the CESCL has noted a deficiency in BMPs or deviation from original design. 2.1 The 12 Elements 2.1.1 Element 1: Preserve Vegetation / Mark Clearing Limits 18.06 acres of the site are to be developed and mass graded to balance cut and fills. To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of construction will be clearly marked before land-disturbing activities begin. Trees that are to be preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the field and on the plans. In general, natural vegetation and native top shall be retained in an undisturbed state to the maximum extent possible. The BMP relevant to marking the clearing limits that will be applied for this project include the following: List and describe BMPs: • High Visibility Fence (BMP C103) Install colored orange fence to protect areas that are not to be disturbed, and mark trees to be preserved. • Silt Fence (BMP C233) Silt fencing shall be used to control sediment flow offsite throughout the construction process. Installation Schedules: All BMPs to preserve vegetation and mark clearing limits are to be installed prior to clearing and grading Inspection and Maintenance plan: All fencing is to be inspected at the end of each day's work and repaired if found to noncompliant with BMP specifications P a g e | 9 16055.021.doc Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.2 Element 2: Establish Construction Access Construction access or activities occurring on unpaved areas shall be minimized, yet where necessary, access points shall be stabilized to minimize the tracking of sediment onto public roads. Street sweeping and street cleaning shall be employed where necessary to prevent sediment from entering state waters. All wash wastewater shall be controlled onsite. The specific BMPs related to establishing construction access hat will be used on this project are as follows: List and describe BMPs: • Stabilized Construction Entrance (BMP C105) One quarry spall construction entrance will be placed at the dead end of 124th PL SE, near the proposed entrance to the site. This stabilized construction entrance will be used to minimize the amount of sediment transported off site onto the existing roadway by construction traffic. • Construction Road/Parking Area Stabilization (BMP C107) Proposed roads shall be stabilized immediately after grading to reduce erosion by construction traffic or surface water runoff. During vertical construction, apply quarry spall base on drive approaches for buildings lot/pad access or in other high traffic areas such as material equipment storage and concrete washout areas. • Concrete Washout Area (BMP C154) Conduct washout off-site, or perform on-site concrete washout in a designated area. This is done to prevent pollutants from entering surface or ground water If sediment is tracked off site, clean the affected roadway thoroughly at the end of each day or more frequently, as necessary. Remove sediment from roads by shoveling, sweeping, or pickup and transport of the sediment to a controlled sediment disposal area. Conduct street washing only after sediment removal in accordance with special condition S9.D.2.d. Control street wash wastewater by pumping back on site or otherwise preventing it from discharging off site into catch basins, stormwater conveyance systems, creek, or rivers that connect to waters of the State. Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. P a g e | 10 16055.021.doc Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.3 Element 3: Control Flow Rates In order to protect the properties and waterways downstream of the project site, stormwater discharges from the site will be controlled. The Specific BMPs for the flow control that shall be used on this project include the following: Will you construct stormwater retention and/or detention facilities? Yes No Will you use permanent infiltration ponds or other low impact development (example: rain gardens, bio-retention, porous pavement) to control flow during construction? Yes No List and describe BMPs: • Temporary Sediment Pond (BMP C241) The contractor shall size and constructed temporary sediment ponds located on the proposed lots 2-3, 74-75 and 92-93, or other approved locations. A temporary outfall shall discharge runoff to the existing closed drainage system located within SE 18th Street and used during construction to mitigate onside runoff. The permanent drainage facility may be used once it is completed The project site is located west of the Cascade Mountain Crest. As a result, the project must comply with the Minimum Requirement 7 (Ecology 2012). Minimum Requirement 7 states that projects must provide flow control to reduce the impacts of stormwater runoff from impervious surfaces and land cover conversions. Essentially, discharge rates of stormwater from the site will be controlled where increases in impervious area or soil compaction during construction could lead to downstream erosion, or where necessary to meet local agency stormwater discharge requirements (e.g. discharge to combined sewer systems). Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead P a g e | 11 16055.021.doc 2.1.4 Element 4: Install Sediment Controls All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal BMP before leaving the construction site or prior to being discharge to a detention facility. The specific BMPs to be used for controlling sediment on this project are as follows: List and describe BMPs: • Silt Fence (BMP C233) During site development phase, silt fence will be used along the downhill perimeter of the project to prevent sediment from leaving the site. During the homebuilding phase, sediment control will not be necessary on all lots prior to disturbance, as many are flat with well established grass cover. Temporary stabilized lots with slope, or less well established grass cover will be inspected during wet weather conditions and, if required, silt fence may be used as a sediment control. Before removing vegetation on the lots, silt fence will be installed as a sediment control behind curb. • Storm Drain Inlet Protection (BMP C220) Catch basins and storm drain inlets within the project boundary and downstream will have an approved from of inlet protection installed. This will prevent coarse sediment from entering the drainage system prior to permanent stabilization of the disturbed draining area. In additions, sediment will be removed from paved areas in and adjacent to construction work areas manually or using a mechanical sweepers, as needed to minimize tracking of sediments on vehicle tires away from the site and to minimize the transmission of sediments from adjacent streets in runoff The following BMPs will be implemented as end-of-pipe sediment controls as required to meet permitted turbidity limits in the sit discharge(s). Prior to the implementation of these methods, sediment sources and erosion control and soil stabilization BMP efforts will be maximized to reduce the need for end-of-pipe sediment controls. • Temporary Sediment Pond (BMP C241) • Construction Stormwater Filtration (BMP C251) • Construction Stormwater Chemical Treatment (BMP C250) (Implemented only with prior written approval from Ecology.) P a g e | 12 16055.021.doc Implement BMP C250/251 above end-of-pipe measures only if sediment sources and erosion control and soil stabilization BMP efforts are not sufficient to reduce sedimentation. Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.5 Element 5: Stabilize Soils Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be used in this project are as follows: West of the Cascade Mountains Crest Season Dates Number of Days Soils Can be Left Exposed During the Dry Season May 1 – September 30 7 days During the Wet Season October 1 – April 30 2 days Soils must be stabilized at the end of the shift before a holiday or weekend if needed based on the weather forecast. Anticipated project dates: Start date: May 1, 2017 End date: December 31, 2022 Will you construct during the wet season? Yes No List and describe BMPs: • Temporary and Permanent Seeding (BMP C120) Following final or fine grading activity in the rear and side yards, permanent seeding shall be placed on exposed soil to provide permanent erosion protection. • Mulching (BMP C121) During the site development phase, mulching will be used for areas that will be unworked for more than 2 days. Temporary seeding will be applied to areas that will be P a g e | 13 16055.021.doc unworked for more than 7 days. During the home building phase, the construction area will be significantly stabilized through well established grass cover. Proposed driveways will receive base course materials as described under Element #2 above. Areas cleared for building foundations or utility and irrigation placement will be temporarily stabilized by one of the following methods which are based on the period exposed soils are left unworked: o If exposed soils are left unworked for more than 7 days during the dry season and 2 days during the wet season but less than 30 days, mulching shall be applied. o If exposed soils are left unworked for more than 30 days, temporary or permanent seeding shall be applied. • Nets and Blankets (BMP C122) Once final or fine grading activity has been completed, install Jute Matting on slopes prior to planting. • Sodding (BMP C124) Following final or fine grading activity in the front yard, sod shall be placed on exposed soil to provide permanent and immediate erosion protection. • Plastic Covering (BMP C123) • Topsoiling (BMP C125) Utilize stockpile management during all phases of construction per BMP. Cover stockpiles with plastic covering to prevent erosion during rain events. • Wattles (BMP C235) Install wattles downslope of newly landscaped areas to control sediment runoff until stabilization. Cement or Calcium Chloride may be used for soil stabilization and dewatering. See section 4.2.2 for pH Sampling Requirements. The project site is located west of the Cascade Mountain Crest. As such, no soils shall remain exposed and unworked for more than 7 days during the dry season (May 1 to September 30) and 2 days during the wet season (October 1 to April 30). Regardless of the time of year, all soils shall be stabilized at the end of the shift before a holiday or weekend if needed based on weather forecasts. P a g e | 14 16055.021.doc Cut and fill slopes will be stabilized as soon as possible and soil stockpiles will be temporarily covered with plastic sheeting. All stockpiled soils shall be stabilized from erosion, protected with sediment trapping measures, and where possible, be located away from storm drain inlets, waterways, and drainage channels. Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.6 Element 6: Protect Slopes All cut and fill slopes will be designed, constructed, and protected in a manner that minimizes erosion. The following specific BMPs will be used to protect slopes for this project: West of the Cascade Mountains Crest Describe how slopes will be designed, constructed, and protected to minimize erosion. Temporary pipe slope drains must handle the peak 10-minute flow rate from a Type 1A, 10-year, 24-hour frequency storm for the developed condition. Alternatively, the 10-year, 1-hour flow rate predicted by an approved continuous runoff model, increased by a factor of 1.6, may be used. The hydrologic analysis must use the existing land cover condition for predicting flow rates from tributary areas outside the project limits. For tributary areas on the project site, the analysis must use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. If using the Western Washington Hydrology Model (WWHM) to predict flows, bare soil areas should be modeled as “landscaped area”. Describe how you will reduce scouring within constructed channels that are cut down a slope. Will steep slopes be present at the site during construction? Yes No List and describe BMPs: • Temporary and Permanent Seeding (BMP C120) P a g e | 15 16055.021.doc The site is moderately sloped (less than 15%). Sloping areas will be treated as described under Element 5 above. Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.7 Element 7: Protect Drain Inlets Drain inlets will be protected using the following BMP methods: Describe how you will protect all operable storm drain inlets so that stormwater runoff does not enter the stormwater conveyance system. Describe how you will remove sediment that enters the stormwater conveyance system (i.e., filtration, treatment, etc.). Keep in mind inlet protection may function well for coarse sediment but is less effective in filtering finer particles and dissolved constituents. Inlet protection is the last component of a treatment train and protection of drain inlets include additional sediment and erosion control measures. Inlet protection devices will be cleaned (or removed and replaced), when sediment has filled the device by one third (1/3) or as specified by the manufacturer. Inlets will be inspected weekly at a minimum and daily during storm events. List and describe BMPs: • Storm Drain Inlet Protection (BMP C220) Prior to construction, storm drain inlet protection will be utilized on all catch basins in the roadway along the frontage of any areas receiving stormwater from construction activities within the permitted area. Install inlet protection once permanent storm drain inlets on site are constructed. Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead P a g e | 16 16055.021.doc 2.1.8 Element 8: Stabilize Channels and Outlets Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural drainage point, efforts will be made to prevent downstream erosion. The specific BMPs for channel and outlet stabilization that shall be used on this project include: Describe how you will prevent downstream erosion where site runoff is to be conveyed in channels, discharged to a stream or, discharged to a natural drainage point. West of the Cascade Mountains Crest On-site conveyance channels must handle the peak 10-minute flow rate from a Type 1A, 10-year, 24-hour frequency storm for the developed condition. Alternatively, the 10-year, 1-hour flow rate predicted by an approved continuous runoff model, increased by a factor of 1.6, may be used. The hydrologic analysis must use the existing land cover condition for predicting flow rates from tributary areas outside the project limits. For tributary areas on the project site, the analysis must use the temporary or permanent project land cover condition, whichever will produce the highest flow rates. If using the WWHM to predict flows, bare soil areas should be modeled as “landscaped area”. Provide stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent stream banks, slopes, and downstream reaches, will be installed at the outlets of all conveyance systems. List and describe BMPs: • Interceptor Dike and Swale (BMP C200) During the site development phase, interceptor dikes and swales shall be constructed down slope and on site of the construction site to convey stormwater to an erosion control facility. • Check Dams (BMP C207) Check dams shall be used to reduce the velocity and energy of concentrated flow in swales or ditches. • Outlet Protection (BMP C209) Outlet protection will be constructed at the outlet location of the storm drainage piping to prevent erosion. P a g e | 17 16055.021.doc Installation Schedules: Installation schedule to be determined by the General Contractor Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead 2.1.9 Element 9: Control Pollutants All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. The following pollutants are anticipated to be present on-site: Table 2 – Pollutants Pollutant (List pollutants and source, if applicable) Installation of sediment and erosion controls Installation of stabilized exits Vehicle tracking Clearing and grubbing operations Grading operations Exposed soils and slopes Import/export operations Utility excavation operations Landscapeing operations Topsoil stripping and stockpiling Fine grading of home sites Vertical Construction Concrete List and describe BMPs: Housekeeping BMPs The following sections describe the controls, including storage practices to minimize exposure of the materials to stormwater as well as spill prevention and response practices. All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Vehicles, construction equipment, and/or petroleum product storage/dispensing: P a g e | 18 16055.021.doc • All vehicles, equipment, and petroleum product storage/dispensing areas will be inspected regularly to detect any leaks or spills, and to identify maintenance needs to prevent leaks or spills. Secondary containment such as drip pans will be placed under any leaking vehicles or equipment. All petroleum product storage containers will be placed in secondary containment (see spill prevention and control below). • On-site fueling tanks and petroleum product storage containers shall include secondary containment. • Spill prevention measures, such as drip pans, will be used when conducting maintenance and repair of vehicles or equipment or when vehicle/equipment leaks are observed. • In order to perform emergency repairs on site, temporary plastic will be placed beneath and, if raining, over the vehicle. • Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Chemical storage: • Any chemicals stored in the construction areas will conform to the appropriate source control BMPs listed in Volume IV of the Ecology stormwater manual. In Western WA, all chemicals shall have cover, containment, and protection provided on site, per BMP C153 for Material Delivery, Storage and Containment in SWMMWW 2012. • Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers’ recommendations for application procedures and rates shall be followed. Concrete and grout: • Process water and slurry resulting from concrete work will be prevented from entering the waters of the State by implementing Concrete Handling measures (BMP C151) and Sawcutting and Surfacing Pollution Prevention (BMP C152). Sanitary wastewater: • Proper sanitary and septic waste management are waste management and material pollution controls that prevent the discharge of pollutants to stormwater from sanitary and septic waste by providing convenient, well-maintained facilities, and arranging for regular service and disposal. Implement as follows: P a g e | 19 16055.021.doc o Facilities should be located away from drainage facilities, watercourses, and from traffic circulation. o Provide a sufficient quantity of facilities to accommodate the workforce. o Temporary sanitary facilities must be equipped with containment to prevent discharge of pollutants to the stormwater drainage system of the receiving water. o When subjected to high winds or risk of high winds, temporary sanitary facilities should be secured to prevent overturning. o Sanitary facilities should be located in a convenient location. o Sanitary or septic wastes should be treated or disposed of in accordance with state and local requirements. o Sanitary facilities should be maintained in good working order by a licensed service. Solid and Liquid Waste: • Solid and liquid waste generated during construction such as construction materials, contaminated materials, and waste materials from maintenance activities will be prevented from entering the waters of the State. Solid and liquid waste shall be handled in accordance with BMPs for Storage of Liquid, Food Waste, or Dangerous Waste Containers and BMPs for Loading and Unloading Areas for Liquid or Solid Materials. o Solid waste will be stored in secure, clearly marked containers. o Promptly contain and clean up solid and liquid pollutant leaks and spills including oils, solvents, fuels, and dust from manufacturing operations on any exposed soil, vegetation, or paved area. o Sweep paved material handling and storage areas regularly as needed, for the collection and disposal of dust and debris that could contaminate stormwater. Do not hose down pollutants from any area to the ground, storm drain, conveyance ditch, or receiving water unless necessary for dust control purposes to meet air quality regulations. Installation Schedules: The described BMPs will be implemented while all pollution generating materials are onsite. Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead Will maintenance, fueling, and/or repair of heavy equipment and vehicles occur on-site? Yes No If yes, describe spill prevention and control measures in place while conducting maintenance, fueling, and repair of heavy equipment and vehicles. P a g e | 20 16055.021.doc If yes, also provide the total volume of fuel on-site and capacity of the secondary containment for each fuel tank. Secondary containment structures shall be impervious. List and describe BMPs: Spill Prevention and Control BMPs Prevent or reduce the discharge of pollutants to drainage systems or watercourses from leaks and spills by reducing the chance for spills, stopping the source of spills, containing and cleaning up spills, properly disposing of spill materials, and training employees. This best management practice covers only spill prevention and control. However, Materials Delivery and Storage (BMP C153), also contains useful information, particularly on spill prevention. • To the extent that the work can be accomplished safely, spills of oil, petroleum products, and substances listed under 40 CFR parts 110,117, and 302, and sanitary and septic wastes should be contained and cleaned up immediately. • Store hazardous materials and wastes in covered containers and protect from vandalism. • Place a stockpile of spill cleanup materials where it will be readily accessible. • Train employees in spill prevention and cleanup. • Designate responsible individuals to oversee and enforce control measures. • Spills should be covered and protected from stormwater runon during rainfall to the extent that it doesn’t compromise cleanup activities. • Do not bury or wash spills with water. • Store and dispose of used clean up materials, contaminated materials, and recovered spill material that is no longer suitable for the intended purpose in conformance with the provisions in applicable BMPs. • Do not allow water used for cleaning and decontamination to enter storm drains or watercourses. Collect and dispose of contaminated water in accordance WSDOE regulations. • Contain water overflow or minor water spillage and do not allow it to discharge into drainage facilities or watercourses. • Place proper storage, cleanup, and spill reporting instructions for hazardous materials stored or used on the project site in an open, conspicuous, and accessible location. • Keep waste storage areas clean, well organized, and equipped with ample clean supplies as appropriate for the materials being stored. Perimeter controls, containment structures, covers, and liners should be repaired or replaced as needed to maintain proper function. Cleanup: • Clean up leaks and spills immediately. • Use a rag for small spills on paved surfaces, a damp mop for general cleanup, and absorbent material for larger spills. If the spilled material is hazardous, then the used P a g e | 21 16055.021.doc cleanup materials are also hazardous and must be sent to either a certified laundry (rags) or disposed of as hazardous waste. • Never hose down or bury dry material spills. Clean up as much of the material as possible and dispose of properly. • The spill kit should include, at a minimum: o 1-Water Resistant Nylon Bag o 3-Oil Absorbent Socks 3”x 4’ o 2-Oil Absorbent Socks 3”x 10’ o 12-Oil Absorbent Pads 17”x19” o 1-Pair Splash Resistant Goggles o 3-Pair Nitrile Gloves o 10-Disposable Bags with Ties o Instructions • Spill kits will be located in areas with a high potential for spills and deployed in a manner that allows rapid access and use by contractors. Some heavy equipment may have onboard spill kits for small spills. Spill control kits will be inspected and inventoried each construction season to confirm all required items are present. Spill control kits will be inventoried after each emergency event and restocked as needed. Minor Spills: • Minor spills typically involve small quantities of oil, gasoline, paint, etc. which can be controlled at the discovery of the spill. • Contain the spread of the spill. • Use absorbent materials on small spills rather than hosing down or burying the spill. • Notify the project foreman immediately • Recover spilled materials. • Clean the contaminated area and properly dispose of contaminated materials. • If the spill occurs on paved or impermeable surfaces, clean up using "dry" methods (absorbent materials, cat litter and/or rags). Contain the spill by encircling with absorbent materials and do not let the spill spread widely. • If the spill occurs in dirt areas, immediately contain the spill by constructing an earthen dike. Dig up and properly dispose of contaminated soil. • If the spill occurs during rain, cover spill with tarps or other material to prevent contaminating runoff. Semi-Significant Spills: • Semi-significant spills still can be controlled by the first responder along with the aid of other personnel such as laborers and the foreman, etc. This response may require the cessation of all other activities. Spills should be cleaned up immediately. P a g e | 22 16055.021.doc Significant/Hazardous Spills • For significant or hazardous spills that cannot be controlled by personnel in the immediate vicinity, the following steps should be taken: o Notify the local emergency response by dialing 911. In addition to 911, the contractor will notify the proper City or County officials. All emergency phone numbers will be posted at the construction site. o Contact your Supervisor and the Divisional Environmental Manager. For spills of federal reportable quantities, (examples are listed below) in conformance with the requirements in 40 CFR parts 110,119, and 302, the Division Environmental Manager (DEM) will notify the National Response Center at (800) 424-8802. The DEM will notify the Department of Ecology and any other applicable agencies. • The services of a spills contractor or a Haz-Mat team should be obtained immediately. Construction personnel should not attempt to clean up until the appropriate and qualified staffs have arrived at the job site. • Notification should first be made by telephone and followed up with a written report. Other agencies which may need to be consulted include, but are not limited to, the Public Works Department, the Coast Guard, the Highway Patrol, the City/County Police Department and Department of Ecology. • Federal regulations require that any significant oil spill into a water body or onto an adjoining shoreline be reported to the National Response Center (NRC) at 800-424-8802 (24 hours) Installation Schedules: The described BMPs will be implemented while all pollution generating materials are onsite. Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead Will wheel wash or tire bath system BMPs be used during construction? Yes No If yes, provide disposal methods for wastewater generated by BMPs. If discharging to the sanitary sewer, include the approval letter from your local sewer district under Correspondence in Appendix C. List and describe BMPs: • Wheel Wash (BMP C106) P a g e | 23 16055.021.doc Discharge wheel wash or tire bath wastewater to a separate on-site treatment system that prevents discharge to surface water, such as closed-loop recirculation or upland land application, or to the sanitary sewer with local sewer district approval. Installation Schedules: The described BMPs will be implemented while all pollution generating materials are onsite. Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. Responsible Staff: Certified Erosion and Sediment Control Lead Will pH-modifying sources be present on-site? Yes No If yes, check the source(s). Table 3 – pH-Modifying Sources None Bulk cement Cement kiln dust Fly ash Other cementitious materials New concrete washing or curing waters Waste streams generated from concrete grinding and sawing Exposed aggregate processes Dewatering concrete vaults Concrete pumping and mixer washout waters Recycled concrete Other (i.e., calcium lignosulfate) [please describe: ] Describe BMPs you will use to prevent pH-modifying sources from contaminating stormwater . List and describe BMPs: • pH Control for High pH Water (BMP C253) • High pH Neutralization using CO2 (BMP C252) (Implemented only after notifying the local Jurisdiction.) • Sawcutting and Surfacing Pollution Prevention Installation Schedules: The described BMPs will be implemented while all pollution generating materials are onsite. Inspection and Maintenance plan: Inspection and maintenance is to take place at the end of each day's work. P a g e | 24 16055.021.doc Responsible Staff: Certified Erosion and Sediment Control Lead Adjust pH of stormwater if outside the range of 6.5 to 8.5 su. Obtain written approval from Ecology before using chemical treatment with the exception of CO2 or dry ice to modify pH. Concrete trucks must not be washed out onto the ground, or into storm drains, open ditches, streets, or streams. Excess concrete must not be dumped on-site, except in designated concrete washout areas with appropriate BMPs installed. 2.1.10 Element 10: Control Dewatering There will be no dewatering as part of this construction project. Table 4 – Dewatering BMPs Infiltration Transport off-site in a vehicle (vacuum truck for legal disposal) Ecology-approved on-site chemical treatment or other suitable treatment technologies Sanitary or combined sewer discharge with local sewer district approval (last resort) Use of sedimentation bag with discharge to ditch or swale (small volumes of localized dewatering) List and describe BMPs: None Installation Schedules: None Inspection and Maintenance plan: None Responsible Staff: None P a g e | 25 16055.021.doc 2.1.11 Element 11: Maintain BMPs All temporary and permanent Erosion and Sediment Control (ESC) BMPs shall be maintained and repaired as needed to ensure continued performance of their intended function. Maintenance and repair shall be conducted in accordance with each particular BMP specification (see Volume II of the SWMMWW or Chapter 7 of the SWMMEW). Visual monitoring of all BMPs installed at the site will be conducted at least once every calendar week and within 24 hours of any stormwater or non-stormwater discharge from the site. If the site becomes inactive and is temporarily stabilized, the inspection frequency may be reduced to once every calendar month. All temporary ESC BMPs shall be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be stabilized on-site or removed. Disturbed soil resulting from removal of either BMPs or vegetation shall be permanently stabilized. Additionally, protection must be provided for all BMPs installed for the permanent control of stormwater from sediment and compaction. BMPs that are to remain in place following completion of construction shall be examined and restored to full operating condition. If sediment enters these BMPs during construction, the sediment shall be removed and the facility shall be returned to conditions specified in the construction documents. P a g e | 26 16055.021.doc 2.1.12 Element 12: Manage the Project The project will be managed based on the following principles: • Projects will be phased to the maximum extent practicable and seasonal work limitations will be taken into account. • Inspection and monitoring: o Inspection, maintenance and repair of all BMPs will occur as needed to ensure performance of their intended function. o Site inspections and monitoring will be conducted in accordance with Special Condition S4 of the CSWGP. Sampling locations are indicated on the Site Map. Sampling station(s) are located in accordance with applicable requirements of the CSWGP. • Maintain an updated SWPPP. o The SWPPP will be updated, maintained, and implemented in accordance with Special Conditions S3, S4, and S9 of the CSWGP. As site work progresses the SWPPP will be modified routinely to reflect changing site conditions. The SWPPP will be reviewed monthly to ensure the content is current. Table 5 – Management Design the project to fit the existing topography, soils, and drainage patterns Emphasize erosion control rather than sediment control Minimize the extent and duration of the area exposed Keep runoff velocities low Retain sediment on-site Thoroughly monitor site and maintain all ESC measures Schedule major earthwork during the dry season Other (please describe) P a g e | 27 16055.021.doc Optional: Fill out Table 6 by listing the BMP associated with specific construction activities. Identify the phase of the project (if applicable). To increase awareness of seasonal requirements, indicate if the activity falls within the wet or dry season. Table 6 – BMP Implementation Schedule Phase of Construction Project Stormwater BMPs Date Wet/Dry Season [Insert construction activity] [Insert BMP] [MM/DD/YYYY] [Insert Season] P a g e | 28 16055.021.doc Phase of Construction Project Stormwater BMPs Date Wet/Dry Season [Insert construction activity] [Insert BMP] [MM/DD/YYYY] [Insert Season] Tab 3.0 P a g e | 29 16055.021.doc 3 Pollution Prevention Team Table 7 – Team Information Title Name(s) Phone Number Certified Erosion and Sediment Control Lead (CESCL) Luke Thornton Certification: EF6151516 Expiration: 06/15/18 Office: 425-251-6222 24-Hour Cell: 206-743-2328 Resident Engineer Barry Talkington 425-251-6222 Emergency Ecology Contact To be determined N/A Emergency Permittee/ Owner Contact To be determined N/A Non-Emergency Owner Contact To be determined N/A Monitoring Personnel To be determined N/A Ecology Regional Office 3190 160th Ave SE, Bellevue, WA (425) 649-7000 Tab 4.0 P a g e | 30 16055.021.doc 4 Monitoring and Sampling Requirements Monitoring includes visual inspection, sampling for water quality parameters of concern, and documentation of the inspection and sampling findings in a site log book. A site log book will be maintained for all on-site construction activities and will include: • A record of the implementation of the SWPPP and other permit requirements • Site inspections • Stormwater sampling data The site log book must be maintained on-site within reasonable access to the site and be made available upon request to Ecology or the local jurisdiction. Numeric effluent limits may be required for certain discharges to 303(d) listed waterbodies. See CSWGP Special Condition S8 and Section 5 of this template. 4.1 Site Inspection Site inspections will be conducted at least once every calendar week and within 24 hours following any discharge from the site. For sites that are temporarily stabilized and inactive, the required frequency is reduced to once per calendar month. The discharge point(s) are indicated on the Site Map (see Appendix A) and in accordance with the applicable requirements of the CSWGP. 4.2 Stormwater Quality Sampling 4.2.1 Turbidity Sampling Requirements include calibrated turbidity meter or transparency tube to sample site discharges for compliance with the CSWGP. Sampling will be conducted at all discharge points at least once per calendar week. Method for sampling turbidity: Table 8 – Turbidity Sampling Method Turbidity Meter/Turbidimeter (required for disturbances 5 acres or greater in size) Transparency Tube (option for disturbances less than 1 acre and up to 5 acres in size) The benchmark for turbidity value is 25 nephelometric turbidity units (NTU) and a transparency less than 33 centimeters. If the discharge’s turbidity is 26 to 249 NTU or the transparency is less than 33 cm but equal to or greater than 6 cm, the following steps will be conducted: 1. Review the SWPPP for compliance with Special Condition S9. Make appropriate revisions within 7 days of the date the discharge exceeded the benchmark. P a g e | 31 16055.021.doc 2. Immediately begin the process to fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible. Address the problems within 10 days of the date the discharge exceeded the benchmark. If installation of necessary treatment BMPs is not feasible within 10 days, Ecology may approve additional time when the Permittee requests an extension within the initial 10-day response period. 3. Document BMP implementation and maintenance in the site log book. If the turbidity exceeds 250 NTU or the transparency is 6 cm or less at any time, the following steps will be conducted: 1. Telephone the applicable Ecology Region’s Environmental Report Tracking System (ERTS) number within 24 hours. • Central Region (Benton, Chelan, Douglas, Kittitas, Klickitat, Okanogan, Yakima): (509) 575-2490 • Eastern Region (Adams, Asotin, Columbia, Ferry, Franklin, Garfield, Grant, Lincoln, Pend Oreille, Spokane, Stevens, Walla Walla, Whitman): (509) 329-3400 • Northwest Region (King, Kitsap, Island, San Juan, Skagit, Snohomish, Whatcom): (425) 649-7000 • Southwest Region (Clallam, Clark, Cowlitz, Grays Harbor, Jefferson, Lewis, Mason, Pacific, Pierce, Skamania, Thurston, Wahkiakum,): (360) 407-6300 2. Immediately begin the process to fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible. Address the problems within 10 days of the date the discharge exceeded the benchmark. If installation of necessary treatment BMPs is not feasible within 10 days, Ecology may approve additional time when the Permittee requests an extension within the initial 10-day response period 3. Document BMP implementation and maintenance in the site log book. 4. Continue to sample discharges daily until one of the following is true: • Turbidity is 25 NTU (or lower). • Transparency is 33 cm (or greater). • Compliance with the water quality limit for turbidity is achieved. o 1 - 5 NTU over background turbidity, if background is less than 50 NTU o 1% - 10% over background turbidity, if background is 50 NTU or greater • The discharge stops or is eliminated. P a g e | 32 16055.021.doc 4.2.2 pH Sampling pH monitoring is required for “Significant concrete work” (i.e., greater than 1000 cubic yards poured or recycled concrete over the life of the project). The use of engineered soils (soil amendments including but not limited to Portland cement-treated base [CTB], cement kiln dust [CKD] or fly ash) also requires pH monitoring. For significant concrete work, pH sampling will start the first day concrete is poured and continue until it is cured, typically three (3) weeks after the last pour. For engineered soils, pH sampling begins when engineered soils are first exposed to precipitation and continues until the area is fully stabilized. If the measured pH is 8.5 or greater, the following measures will be taken: 1. Prevent high pH water from entering storm sewer systems or surface water. 2. Adjust or neutralize the high pH water to the range of 6.5 to 8.5 su using appropriate technology such as carbon dioxide (CO2) sparging (liquid or dry ice). 3. Written approval will be obtained from Ecology prior to the use of chemical treatment other than CO2 sparging or dry ice. Method for sampling pH: Table 9 – pH Sampling Method pH meter pH test kit Wide range pH indicator paper Tab 5.0 P a g e | 33 16055.021.doc 5 Discharges to 303(d) or Total Maximum Daily Load (TMDL) Waterbodies 5.1 303(d) Listed Waterbodies Is the receiving water 303(d) (Category 5) listed for turbidity, fine sediment, phosphorus, or pH? Yes No List the impairment(s): If yes, discharges must comply with applicable effluent limitations in S8.C and S8.D of the CSWGP. 5.2 TMDL Waterbodies Waste Load Allocation for CWSGP discharges: Describe the method(s) for TMDL compliance: List and describe BMPs: Discharges to TMDL receiving waterbodies will meet in-stream water quality criteria at the point of discharge. The Construction Stormwater General Permit Proposed New Discharge to an Impaired Water Body form is included in Appendix F. Tab 6.0 P a g e | 34 16055.021.doc 6 Reporting and Record Keeping 6.1 Record Keeping 6.1.1 Site Log Book A site log book will be maintained for all on-site construction activities and will include: • A record of the implementation of the SWPPP and other permit requirements • Site inspections • Sample logs 6.1.2 Records Retention Records will be retained during the life of the project and for a minimum of three (3) years following the termination of permit coverage in accordance with Special Condition S5.C of the CSWGP. Permit documentation to be retained on-site: • CSWGP • Permit Coverage Letter • SWPPP • Site Log Book Permit documentation will be provided within 14 days of receipt of a written request from Ecology. A copy of the SWPPP or access to the SWPPP will be provided to the public when requested in writing in accordance with Special Condition S5.G.2.b of the CSWGP. 6.1.3 Updating the SWPPP The SWPPP will be modified if: • Found ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from the site. • There is a change in design, construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of the State. The SWPPP will be modified within seven (7) days if inspection(s) or investigation(s) determine additional or modified BMPs are necessary for compliance. An updated timeline for BMP implementation will be prepared. P a g e | 35 16055.021.doc 6.2 Reporting 6.2.1 Discharge Monitoring Reports Cumulative soil disturbance is one (1) acre or larger; therefore, Discharge Monitoring Reports (DMRs) will be submitted to Ecology monthly. If there was no discharge during a given monitoring period the DMR will be submitted as required, reporting “No Discharge”. The DMR due date is fifteen (15) days following the end of each calendar month. DMRs will be reported online through Ecology’s WQWebDMR System. To sign up for WQWebDMR go to: http://www.ecy.wa.gov/programs/wq/permits/paris/webdmr.html 6.2.2 Notification of Noncompliance If any of the terms and conditions of the permit is not met, and the resulting noncompliance may cause a threat to human health or the environment, the following actions will be taken: 1. Ecology will be immediately notified of the failure to comply by calling the applicable Regional office ERTS phone number (Regional office numbers listed below). 2. Immediate action will be taken to prevent the discharge/pollution or otherwise stop or correct the noncompliance. If applicable, sampling and analysis of any noncompliance will be repeated immediately and the results submitted to Ecology within five (5) days of becoming aware of the violation. 3. A detailed written report describing the noncompliance will be submitted to Ecology within five (5) days, unless requested earlier by Ecology. Specific information to be included in the noncompliance report is found in Special Condition S5.F.3 of the CSWGP. Anytime turbidity sampling indicates turbidity is 250 NTUs or greater, or water transparency is 6 cm or less, the Ecology Regional office will be notified by phone within 24 hours of analysis as required by Special Condition S5.A of the CSWGP. • Central Region at (509) 575-2490 for Benton, Chelan, Douglas, Kittitas, Klickitat, Okanogan, or Yakima County • Eastern Region at (509) 329-3400 for Adams, Asotin, Columbia, Ferry, Franklin, Garfield, Grant, Lincoln, Pend Oreille, Spokane, Stevens, Walla Walla, or Whitman County • Northwest Region at (425) 649-7000 for Island, King, Kitsap, San Juan, Skagit, Snohomish, or Whatcom County • Southwest Region at (360) 407-6300 for Clallam, Clark, Cowlitz, Grays Harbor, Jefferson, Lewis, Mason, Pacific, Pierce, Skamania, Thurston, or Wahkiakum P a g e | 36 16055.021.doc Include the following information: 1. Your name and / Phone number 2. Permit number 3. City / County of project 4. Sample results 5. Date / Time of call 6. Date / Time of sample 7. Project name In accordance with Special Condition S4.D.5.b of the CSWGP, the Ecology Regional office will be notified if chemical treatment other than CO2 sparging is planned for adjustment of high pH water. P a g e | 37 16055.021.doc Appendix/Glossary A. Site Map The site map must meet the requirements of Special Condition S9.E of the CSWGP B. BMP Detail Insert BMPs specification sheets here. Download BMPs from the Ecology Construction Stormwater website at: http://www.ecy.wa.gov/programs/wq/stormwat er/construction/index.html Select Resources and Guidance to find the links to the Stormwater Manuals. C. Correspondence Ecology EPA Local Government D. Site Inspection Form Create your own or download Ecology’s template: http://www.ecy.wa.gov/programs/wq/stormwater/construction/index.html Select Permit, Forms and Application to find the link to the Construction Stormwater Site Inspection Form. E. Construction Stormwater General Permit (CSWGP) Download the CSWGP: http://www.ecy.wa.gov/programs/wq/stormwater/construction/index.html F. 303(d) List Waterbodies / TMDL Waterbodies Information Proposed New Discharge to an Impaired Water Body form SWPPP Addendum addressing impairment G. Contaminated Site Information Administrative Order Sanitary Discharge Permit Soil Management Plan Soil and Groundwater Reports Maps and Figures Depicting Contamination H. Engineering Calculations ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ ALLURA AT TIFFANY PARK ALLURA AT TIFFANY PARKTED-40-3923 4/26/17 R-3923_ _ _ Transmittal - 16055-2017-0426.pdf Transmittal 18215 72nd Ave S, Kent, WA 98032 Page 1 of 2 PROJECT: Allura at Tiffany Park 016055 DATE: 4/26/2017 SUBJECT: 16055 - Allura at Tiffany Park - Revised Early Clear and Grade - Resubmittal TRANSMITTAL ID: 16055-2017-0426 PURPOSE: For your review and comment VIA: Info Exchange FROM NAME COMPANY EMAIL PHONE Rob Gonia 18215 72nd Ave S Kent WA 98032 United States Barghausen Consulting Engineers, Inc. rgonia@barghausen.com (425) 251-6222 TO NAME COMPANY EMAIL PHONE AFowler@Rentonwa.gov AFowler@Rentonwa.gov REMARKS: Ann, Please download the attached documents for review at your earliest convenience. Do not hesitate to contact me if you are having difficulty accessing them. Thank you, Rob Gonia, EIT|Design Engineer Barghausen Consulting Engineers Office: (425) 251-6222 | Fax: (425) 251-8782 Transmittal DATE: 4/26/2017 TRANSMITTAL ID: 16055-20170426 Page 2 of 2 DESCRIPTION OF CONTENTS QTY DATED TITLE NOTES 1 4/26/2017 C_Original Redline Comments_170426.pdf 1 4/26/2017 C_Response_Letter_Barghausen_170426.pdf 1 4/26/2017 P_Civil_Grading_Plans_170426.pdf 1 4/26/2017 R_SWPPP_170426.pdf COPIES: Barry Talkington (Barghausen Consulting Engineers, Inc.) Tom Barghausen (Barghausen Consulting Engineers, Inc.)