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HomeMy WebLinkAboutFPA2024-00001 FPA2024-00002 - FPA Storm Water Plan - 4/1/2024 FPAzo�y-ooc�ol Construction Stormwater Pollution Prevention Plan Manke Family Resources 3500 E Johns Prairie Road Parcel No. 32009-09-02000 Mason County, Washington April 1, 2024 Project#24030 Prepared For: Manke Family Resources, LLC PO Box 1302 Shelton, Washington 98584 (360) 427-8726 Prepared By: Envirotech Engineering PO Box 984 Belfair, Washington 98528 Phone: 360-275-9374 v:asyy 43015 Ff. ltiTER �—. 4/1/24 TABLE OF CONTENTS 1.0 INTRODUCTION.................................................................................................................................1 PROJECTDESCRIPTION............................................................................................................................... 1 EXISTINGSITE CONDITIONS....................................................................................................................... 1 OFFSITE DRAINAGE TO THE PROPERTY PRIMARILY ORIGINATES FROM THE NORTH,EAST,AND WEST. EROSION WAS NOT OBSERVED ON THE PROPERTY....................................................................................... 1 ADJACENTAREAS...................................................................................................................................... 1 CRITICALAREAS........................................................................................................................................2 SOILS..........................................................................................................................................................2 EROSIONPROBLEM AREAS.........................................................................................................................2 CONSTRUCTIONPHASING...........................................................................................................................2 CONSTRUCTIONSCHEDULE........................................................................................................................3 ENGINEERINGCALCULATIONS...................................................................................................................3 2.0 SPECIFIC CONSTRUCTION SWPPP ITEMS.................................................................................4 2.1 ELEMENT I-PRESERVE VEGETATION/MARK CLEARING LIMITS........................................................4 2.2 ELEMENT 2-ESTABLISH CONSTRUCTION ACCESS...............................................................................4 2.3 ELEMENT 3-CONTROL FLOW RATES..................................................................................................4 2.4 ELEMENT 4-INSTALL SEDIMENT CONTROLS.......................................................................................4 2.5 ELEMENT 5-STABILIZE SOILS.............................................................................................................5 2.6 ELEMENT 6-PROTECT SLOPES............................................................................................................5 2.7 ELEMENT 7-PROTECT DRAIN INLETS..................................................................................................5 2.8 ELEMENT 8-STABILIZE CHANNELS AND OUTLETS..............................................................................5 2.9 ELEMENT 9-CONTROL POLLUTANTS..................................................................................................5 2.10 ELEMENT 10-CONTROL DEWATERING..............................................................................................6 2.11 ELEMENT 11-MAINTAIN BMP'5.......................................................................................................6 2.12 ELEMENT 12-MANAGE THE PROJECT...............................................................................................7 2.13 ELEMENT 13-PROTECT LOW IMPACT DEVELOPMENT BMP'S..........................................................7 1.0 Introduction Envirotech Engineering (Envirotech) has completed this construction stormwater pollution prevention plan (SWPPP) in conjunction with the stormwater management plan for a property located at 3500 Johns Prairie Road (Parcel 32009-09-02000) in Shelton, Mason County, Washington. Best Management Practices (BMP's) selected for this project includes a stabilized construction entrance and silt fencing. It is our opinion that these selected BMP's adequate for preventing significant construction stormwater pollution from leaving the project site,and meets the intent of the Stormwater Manual. The following 13 items have been addressed per the prevailing Stormwater Manual. Project Description Information pertaining to the development of this project was provided by the proponent of the property. The proposed development is expected to consist of land clearing in support of future mining activities.. The project is not expected to create any new impervious surface. See the accompanying stormwater management plans for an illustration of current and proposed site features. Existing Site Conditions The property is accessed from E Johns Prairie Road an existing paved roadway in unincorporated Mason County. The Project is currently undeveloped, with clearing on-site. Vegetation is typical of the Pacific Northwest. E State Route 3 extends to east of the property. Beyond the property, rural residential and industrial development exists. Maximum sloping grades within 300 feet of the proposed development area with a vertical relief in excess of at least 10 feet were observed to be 42% on the property, with slopes exceeding 60% beyond. Erosion was not observed on the property. Adjacent Areas The area of land that contributes stormwater runoff to the proposed development areas of the property is generally non existant. The natural drainage from the property is directed to the southeast edge of the property. Runoff is intercepted by an existing roadway ditch along E state Route 3, eventually draining into Oakland Bay. Envirotech Engineering SWPPP PO Box 984 page I Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 Critical Areas Other than the aforementioned moderate slopes located on the property, critical areas were not observed within the vicinity of the project. This project is not anticipated to disturb any critical area. Soils Information on infiltration rates and soil conditions pertaining to the Project was accomplished by Envirotech. Selected information pertaining to the drainage aspect of the project is provided below. The following subsurface conditions are estimated descriptions of the Project subgrade utilizing information from the depth of penetration at all testing, sampling, observed and investigated locations. Soils for this project were described utilizing the Unified Soil Classification System (USCS). Using the USCS in conjunction with estimated relative densities and other anticipated engineering properties of the soil, susceptibility for potential landslides, erosion and seismic hazards may be assessed. Soils within the upper 180 feet are mostly sand and gravel. See the Geotechnical Report for specific details. According to the "Soil Survey of Mason County," by the United States Department of Agriculture, Soil Conservation Service(SCS), the site soils are described as Grove gravelly sandy loam with 30%-45%slopes. According to the USDA Textural Classification System,the site soils are a loamy sand. Based on the fines content, erodibility of the site soils is considered to be medium. Based on the fines content and fraction of clay within the fines content, settleability of the site soils is expected to be fast. Permeability is expected to be moderate for this site due significance of moderate density,and fine-grained soils. According to the Critical Aquifer recharge Areas Map for Mason County, the site is within a Category II Aquifer Recharge Area. Erosion Problem Areas There are no identified or mapped erosion hazard areas for this property. The soil characteristics provide a low to moderate erodibility factor. Construction Phasing Construction phasing for this project is not expected. Upon finishing the clearing, mining of the soils is expected to occur. Envirotech Engineering SWPPP PO Box 984 page 2 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 Construction Schedule Construction of the project may occur as early as June 2024. Wet season erosion control is not likely required for this project. However, wet season construction constraints are not necessary for critical areas. Engineering Calculations Standard sediment ponds and traps were not utilized for this project. However, sedimentation due to construction runoff is anticipated to be retained on site. Significant diversions and waterways were not utilized for this project. Silt fencing is deemed adequate for this project, and calculations are not required for this erosion control. Envirotech Engineering SWPPP PO Box 984 page 3 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 2.0 Specific Construction SWPPP Items The following 13 items have been addressed per the prevailing Stormwater Manual. 2.1 Element 1 -Preserve Vegetation/Mark Clearing Limits Before beginning land disturbing activities, including clearing and grading, clearing limits, sensitive areas and their buffers shall be clearly delineated on-site.This includes delineating trees that are to be preserved within the construction area. Construction activities are not permitted beyond the designated clearing limits without prior approval. Retain the duff layer, native top soil, and natural vegetation in an undisturbed state to the maximum degree practicable. 2.2 Element 2-Establish Construction Access Construction access is designated as the ingress/ egress connecting to E Johns Prairie Road. Existing mining construction entrances may be utilized. One construction access is allowed for this project. Stabilize the construction access with rock per the stormwater plans in order to minimize tracking of sediments off-site. If the stabilized construction entrance proves ineffective, locate wheel wash or tire baths on-site.If sediment is tracked off-site,clean the affected roadway thoroughly at the end of each day, and more frequent as necessary. Remove sediments by any means necessary, and transport the sediment to a controlled sediment disposal area. After sediment removal, conduct street washing, and control wash water by pumping back on-site, or otherwise prevent it from discharging into systems tributary to waters of the State. 2.3 Element 3-Control Flow Rates At all times, flow rates shall be controlled for this project. Natural drainage patterns shall be protected as much as possible during construction, and concentrated flow should not be permitted, unless directed to an engineered drainage facility. Protect downstream waterways and properties from associated discharge of turbid waters. 2.4 Element 4-Install Sediment Controls Sediment discharges from the project site must be minimized. Sediment controls deemed adequate for this project is temporary silt fencing, and shall be located downslope from all disturbed areas. If sediment control is not working as intended, additional controls such as sediment traps, hay bales,filters,or other standard controls will be necessary. Envirotech Engineering SWPPP PO Box 984 page 4 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 2.5 Element 5-Stabilize Soils Soil stabilization is not necessary for this project. Temporary seeding and permanent soil stabilization requirements are provided in the erosion control section of the design drawings. Always minimize the area of exposed soils during construction, including disturbance on steep slopes. In addition, soil compaction should be minimized, and topsoil preserved as much as possible. Soils shall not remain exposed and unworked for more than 7 days during the dry season (May 1 —September 30),and more than 2 days during the wet season(October 1 —April 30). 2.6 Element 6-Protect Slopes Slopes are not expected to be protected for this project. 2.7 Element 7-Protect Drain Inlets There are no existing drain inlets close to the project that would be influenced by the construction.Newly installed catch basins and other inlets, shall be protected from runoff siltation via silt fence inlet barriers, inserts, or other appropriate means. Clean or remove and replace inlet protection devices when sediment has filled one-third of the available storage (unless a different standard is specified by the product manufacturer). 2.8 Element 8-Stabilize Channels and Outlets There are no Channels of Outlets planned for this project. 2.9 Element 9-Control Pollutants Pollution generated from construction must be controlled at all times. Control of pollutants other than sediments includes the following: • All pollutants other than sediments shall be handled and disposed of in a manner that does not cause contamination of stormwater. • Cover, containment and protection from vandalism shall be provided for all chemicals, liquid products,petroleum products,and non-inert wastes present on the project site. • Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed on-site using temporary plastic placed beneath and,if raining,over the vehicle. Envirotech Engineering SWPPP PO Box 984 page 5 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 • Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system or to the sanitary sewer,if available. • 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 rates and procedures shall be followed. 2.10 Element 10-Control Dewatering Although dewatering will not be likely for this project, special provisions are required to be followed when dewatering. The outlet for dewatering shall be located in a position as to prevent sediments and pollution from leaving the site.This may be accomplished by pumping water into a sedimentation pond,or other standard control. 2.11 Element 11 -Maintain BMP's All BMP's must be inspected and maintained in order to assure continued performance of their intended function. Remove all temporary erosion and sediment control BMP's within 30 days after achieving final site stabilization or after the temporary BMP's are no longer needed. Inspection and maintenance for this project includes the following: Stabilized Construction Entrance The stabilized construction entrance shall be inspected at reasonable increments. Increased usage of the construction entrance warrants more frequent inspections. Additional rock shall be added periodically to maintain proper function of the pad. Permanent Vegetation Permanent vegetation shall initially be inspected regularly to insure establishment and healthy growth. Once established, vegetation may need to be periodically fertilized for continuous growth.Vegetation shall be re-established in areas,if necessary. While active construction is in process, all temporary erosion and sediment control facilities shall be inspected and immediately maintained if necessary per the requirements provided above. In the event that construction activities are discontinued for at least 4 consecutive days, the owner shall be responsible for the inspection, and immediate maintenance if necessary, of all temporary erosion and sediment control facilities immediately after storm events, and at least once every 7 days. In addition to the aforementioned inspection and maintenance schedule, the owner shall install additional erosion and sediment control facilities if proposed erosion and sediment control measures prove to be inadequate. Envirotech Engineering SWPPP PO Box 984 page 6 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 2.12 Element 12-Manage the Project Inspection, maintenance, and financial liability of all temporary/ permanent erosion and sedimentation control facilities shall ultimately be the responsibility of the current property owner. All construction facilities and BMP's shall be assured continued performance of their intended function. Since more than 1 acre is planned to be disturbed, a Certified Erosion and Sediment Control Lead (CESCL) may be required. Currently, the designated manager for this project is: Manke Family Resources,LLC PO Box 1302 Shelton,Washington 98584 (360)427-8726 2.13 Element 13—Protect Low Impact Development BMP's Prevent compaction of vegetated flow paths delineated for this project, and other low impact development BMP's that may be associated with this project. This should be done by excluding construction equipment and foot traffic. Envirotech Engineering SWPPP PO Box 984 page 7 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 NOTE:ENTRANCE TO MINE 11UPP PRUPFRTY ENTRANCE TO RR All,f W l N V N'A)N;t LyR�TIN STARAUZED CONSTRUCTION ENTRANCE.SEE DFTAIIA. 1^N S1111, akland lIOT IN mm•nbylel!1 � �370s� .',�r' / ,v N ICIMTY MAP N.T.S. / HXISTINO ROAD TO RR IISSDRDR ua.sL uese'xvrrox LOOGINO Ie)el nl'us uP wN NOIlauwe•Itu+slaavAtcANtu xw.ao - r /�1�� T " )) ARR 7 S "-DI EHd IANNOT Bd 'VI ! / DISPHRSION CANNOT DE A<MIE1'ED NIDnlx)arss / , i' ��; Iser nNlADAI Jf00F LIMITS UP LIX)OMG AREA �- IlnTlns:NAww / / _lOM MMHW RL'FTdR i+ SOIL LOG: A TEL: 6ISO'BROWN POORLY ORADED GRAVELS AND SAND(OP,SP) / PULLDQIPFRMONWIIRRE)RO'FLOW PJJIL IIK PRnPRKTYIR%F IMnLF. 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CALL BEFORE YOU DIG! SHEET DATE: 4/1/24 CALL I IR--1 REVISED BY: .-I YCO-1 CONTROL MANKE DEVELOPMENT-UNIT 1 MANKE FAMILY RESGURCES.i ENVIROTECH EEIGINEEILING 4 EROSION CO PRO BOX 1302 P.o,BOx 914 F DATE: DRAINAGE AND EROSION/SEDIMENT SHELTON.WASHINGTON 1115. BELFAIR,WASHINGTON"528 PHONE:(30)4274n6 PHONE:(360)27SM74 4 REVISED BY: TORWIALLEFERSHICTRIDELCON CONTROL PLAN DATE: JENGINEER: STATEN P.E. NUM. REVISION BY DATE is FPI�?�24-�C�oo i Drainage Report Manke Family Resources 3500 E Johns Prairie Road, Shelton Parcel No. 32009-09-02000 Mason County, Washington April 1, 2024 Project#24030 Prepared For: Manke Family Resources, LLC PO Box 1302 Shelton, Washington 98584 (360) 427-8726 Prepared By: Envirotech Engineering PO Box 984 Belfair, Washington 98528 Phone: 360-275-9374 CLYDF Sp \\ASy��n'l��y S 43045 ss�C).\A0�C 4/1/24 TABLE OF CONTENTS 1.0 PROJECT DESCRIPTION.................................................................................................................. 1 2.0 EXISTING CONDITIONS...................................................................................................................2 2.1 TOPOGRAPHY.....................................................................................................................................2 2.2 SURFACE DRAINAGE..........................................................................................................................2 2.3 SUBSURFACE CONDITIONS.................................................................................................................2 2.3.1 SUBSURFACE CONDITIONS..............................................................................................................2 2.3.2 GROUNDWATER...............................................................................................................................3 3.1 DEVELOPED SITE DRAINAGE CONDITIONS.......................................................................................4 3.2 DOWNSTREAM ANALYSIS...................................................................................................................4 3.2.1 TRIBUTARY DRAINAGE AREA.........................................................................................................4 3.2.2 DOWNSTREAM DISCHARGE.............................................................................................................4 3.2.3 DOWNSTREAM EROSION AND WATER QUALITY............................................................................4 3.2.4 DOWNSTREAM CONCLUSIONS........................................................................................................4 3.3 HYDROLOGY AND HYDRAULIC ANALYSIS/DESIGN..........................................................................5 3.4 FULL DISPERSION.........................................................................................................................5 3.5 BRUSH BARRIER............................................................................................................................5 4.0 INSPECTION AND MAINTENANCE...............................................................................................6 4.1 INSPECTION AND MAINTENANCE SCHEDULE....................................................................................6 4.2 INSPECTION AND MAINTENANCE RESPONSIBILITY...........................................................................6 5.0 CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS......................................................8 6.0 PROJECT ENGINEER'S CERTIFICATION...................................................................................9 Appendices Appendix A—Site Map Appendix B—Pollution Source BMP 1.0 PROJECT DESCRIPTION Envirotech Engineering (Envirotech) has completed this drainage report in conjunction with the stotmwater management plan for a property located at 3500 Johns Prairie Road(Parcel 32009-09- 02000) in Shelton, Mason County, Washington.See the Vicinity Map below for a general indication of the Project location. Information pertaining to the development of this project was provided by the proponent of the property. The proposed development is expected to consist of land clearing in support of future mining activities. The project is not expected to create any new impervious surface. See the accompanying stormwater management plans for an illustration of current and proposed site features. - v`' - MCEWEN PRAIRIE C��obsrt'i F, Project -71 F�tf 6 vakland Bay a rlle 1 HammersL lnkt -J VALLEY ACII Credh Vicinity Map from Mason County Website Envirotech Engineering Drainage Report PO Box 984 page 1 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 2.0 EXISTING CONDITIONS The property is accessed from E Johns Prairie Road an existing paved roadway in unincorporated Mason County. The Project is currently undeveloped, with clearing on-site. Vegetation is typical of the Pacific Northwest. E State Route 3 extends to east of the property. Beyond the property, rural residential and industrial development exists. 2.1 Topography Maximum sloping grades within 300 feet of the proposed development area with a vertical relief in excess of at least 10 feet were observed to be 42% on the property, with slopes exceeding 60% beyond. 2.2 Surface Drainage The natural drainage from the property is directed to the southeast edge of the property. Runoff is intercepted by an existing roadway ditch along E state Route 3, eventually draining into Oakland Bay. 2.3 Subsurface Conditions Information on infiltration rates and soil conditions pertaining to the Project was accomplished by Envirotech. Selected information pertaining to the drainage aspect of the project is provided below. The following subsurface conditions are estimated descriptions of the Project subgrade utilizing information from the depth of penetration at all testing, sampling, observed and investigated locations. Soils for this project were described utilizing the Unified Soil Classification System (USCS). Using the USCS in conjunction with estimated relative densities and other anticipated engineering properties of the soil, susceptibility for potential landslides, erosion and seismic hazards may be assessed. 2.3.1 Subsurface Conditions Soils within the upper 180 feet are mostly sand and gravel. See the Geotechnical Report for specific details. Expanded and specific subsurface descriptions, other than what is provided in this section,are provided within the Geotechnical Report. According to the "Soil Survey of Mason County," by the United States Department of Agriculture, Soil Conservation Service (SCS), the site soils are described as Grove gravelly sandy loam with 30% -45% slopes. According to the USDA Textural Classification System,the site soils are a loamy sand. Based on the fines content,erodibility of the site soils is considered to be medium. Based on the fines content and fraction of clay within the fines content, settleability of the site Envirotech Engineering Drainage Report PO Box 984 page 2 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 soils is expected to be fast. Permeability is expected to be moderate for this site due significance of moderate density,and fine-grained soils. 2.3.2 Groundwater From the water well report(s)and knowledge of the general area, permanent groundwater is at least 100 feet below the current ground surface. 4 Project LZ ;�. Aeriall Soils Map from USDA NRCS Website Envirotech Engineering Drainage Report PO Box 984 page 3 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 3.0 HYDROLOGIC/HYDRAULIC INFORMATION 3.1 Developed Site Drainage Conditions The project is not expected to create any new impervious surface. Best Management Practices (BMPs) for this project includes full dispersion and brush barriers. Natural drainage patterns are to be maintained to the maximum extents practicable. 3.2 Downstream Analysis This project has been analyzed as a Level 1 Downstream Drainage Analysis in accordance with the prevailing Western Washington Stormwater Drainage Manual. 3.2.1 Tributary Drainage Area The upslope watershed is non existent as the area of land modification is at the crest. 3.2.2 Downstream Discharge The natural drainage from the property is directed to the east end of the property. The water travels by sheet flow to a drainage ditch located along E State Route 3, eventually draining into Oakland Bay. 3.2.3 Downstream Erosion and Water Quality FEMA mapping, and other documentation do not reveal flooding or erosion hazards on the property. Water quality within the project watershed is not known to have major issues. Ordinary pollution caused by residences, industrial and roadways are pollution contributors in the area. Off-site mitigation is not deemed necessary for this Project. This is based on the scale of the proposed Project,and on-site mitigation design. 3.2.4 Downstream Conclusions Existing mild sloping green areas appear to have sufficient vegetation and pollution removal qualities for the pollution generating surfaces. The proposed drainage design encourages sheet flow dispersal for the runoff. It is our opinion that with proper maintenance and care of the proposed drainage facility, the proposed development will not constitute measurable runoff to offsite properties. Envirotech Engineering Drainage Report PO Box 984 page 4 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 3.3 Hydrology and Hydraulic Analysis/Design The Stormwater Management Manual for Western Washington (SMMWW) was used to calculate all stormwater management facilities. 3.4 Full Dispersion Storm water runoff from the west to south will be directed to a downhill beyond the clearing area. A minimum of 100 feet of naturally vegetation shall be maintained beyond the logging area. 3.5 Brush Barrier Per SMMWW, BMP C231, Brush Barrier, shall be installed along the southeast portion of the clearing where a 100 foot vegetated flowpath is not viable. The barrier shall be a minimum of five feet wide, be a minimum of two feet in height, and have no more than six inch diameter woody debris.It is acceptable to use existing materials from the logging. Envirotech Engineering Drainage Report PO Box 984 page 5 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 4.0 INSPECTION AND MAINTENANCE Erosion and sediment control measures that may be necessary for this project includes: • Temporary stabilized construction entrance,located at the entrance at the mine. • Permanent Vegetation The following subsections provide details regarding inspection and maintenance schedule, inspection and maintenance responsibility,and an engineer's inspection report. Stabilized Construction Entrance The stabilized construction entrance shall be inspected at reasonable increments. Increased usage of the construction entrance warrants more frequent inspections. Additional rock shall be added periodically to maintain proper function of the pad. Permanent Vegetation Permanent vegetation shall initially be inspected regularly to insure establishment and healthy growth. Once established, vegetation may need to be periodically fertilized for continuous growth.Vegetation shall be re-established in areas,if necessary. 4.1 Inspection and Maintenance Schedule While active construction is in process, all temporary erosion and sediment control facilities shall be inspected and immediately maintained if necessary per the requirements provided above. In the event that construction activities are discontinued for at least 4 consecutive days, the owner shall be responsible for the inspection, and immediate maintenance if necessary, of all temporary erosion and sediment control facilities immediately after storm events, and at least once every 7 days. In addition to the aforementioned inspection and maintenance schedule, the owner shall install additional erosion and sediment control facilities if proposed erosion and sediment control measures prove to be inadequate. For permanent facilities, an Operation and Maintenance Manual should be required for this project. 4.2 Inspection and Maintenance Responsibility Inspection, maintenance, and financial liability of all temporary/ permanent erosion and sedimentation control facilities shall ultimately be the responsibility of the property owner. Currently,the property owner is: Manke Family Resources,LLC PO Box 1302 Shelton,Washington 98584 (360)427-8726 Envirotech Engineering Drainage Report PO Box 984 page 6 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 An operation and maintenance covenant is usually required to cover all stormwater facilities. Performance bonding, or other appropriate instrument, shall be required for this project to ensure compliance with the standards presented in this report. Furthermore, the owner may need to retain an Erosion and Spill Control (ESC) Lead for construction observation and oversight of the project if required by the County to ensure compliance with the ESC components of the approved Drainage and Erosion/ Sediment Control Plans. Envirotech Engineering Drainage Report PO Box 984 page 7 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 5.0 CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS Upon completion of this project and future development of the lot, this project is not expected to generate any pollutants other than sediments. However, potential source of pollutants may occur from spills, leaks, excessive usage, ordinary usage, or vandalism of several pollutants including the following: • Fuel • Oil • Solvent • Degreaser • Dust • Pesticide • Herbacide • Fertilizer • Other Chemicals The aforementioned pollutants are not expected to be currently on-site. The potential sources may be released into the stormwater due to development of the facilities, and/or future use of the facilities. Control of pollutants other than sediments include the following: • All pollutants other than sediments shall be handled and disposed of in a manner that does not cause contamination of stormwater. • Cover, containment and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and non-inert wastes present on the project site. • Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic system drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any discharge or spill incident. Emergency repairs may be performed on-site using temporary plastic placed beneath and,if raining,over the vehicle. • Wheel wash or tire bath wastewater shall be discharged to a separate on-site treatment system or to the sanitary sewer,if available. • 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 rates and procedures shall be followed. See the Best Management Practices for this development that should be adhered to after construction is complete. Envirotech Engineering Drainage Report PO Box 984 page 8 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 6.0 PROJECT ENGINEER'S CERTIFICATION I hereby state that this drainage plan has been prepared by me or under my supervision and meets the standard of care and expertise which is usual and customary in this community for professional engineers. Please contact Michael Staten at 360-275-9374 if you have any questions, comments, or require additional information. Sincerely, Envirotech En meering Ft CLYDF S 0 Ats���t T��Z 43045 FCIsrenN �SS/ONALENG` 4/1/24 Michael Staten, P.E. Project Director Envirotech Engineering Drainage Report PO Box 984 page 9 Parcel 32009-09-02000 Belfair,Washington 98528 Mason County,Washington Ph. 360-275-9374 April 1,2024 APPENDIX A SITE MAP EXISTING ROAD TU HE USED FOR LOGGING \� V BRUSH BARRIER WHERE FULL DISPERSION CANNOT BE ACHIEVED (SF.E DETAILS) LIMITS OF LOGGING AREA 2W MHHW BUFFER i i FULL DISPERSION WHERE IW FLOW PATH ON PROPERTY IS AVAILABLE STABILIZED CONS'PRL'CTION ENTRANCE 10 PROPERTY LINE SETBACK REQUIRED PRIOR TO LEAVING PROPERTY,SEE DETAILS&NOTES. '�-- APPROXIMATE MHHW AND TOE OF SLOPE 1/ n,9 1 / APPENDIX B POLLUTION SOURCE BMP S407 BMPs for Dust Control at Disturbed Land Areas and Unpaved Roadways and Parking Lots Description of Pollutant Sources:Dust can cause air and water pollution problems particularly at demolition sites and in and areas where reduced rainfall exposes soil particles to transport by air. Pollutant Control Approach:Minimize dust generation and apply environmentally friendly and government approved dust suppressant chemicals,if necessary. Applicable Operational BMPs: • Sprinkle or wet down soil or dust with water as long as it does not result in a wastewater discharge. • Use only local and/or state government approved dust suppressant chemicals such as those listed in Ecology Publication#96-433, Terhniuues for Dust Prevention and Suppression. • Avoid excessive and repeated applications of dust suppressant chemicals.Time the application of dust suppressants to avoid or minimize their wash-off by rainfall or human activity such as irrigation. • Apply stormw•ater containment to prevent the conveyance of sediment into storm drains or receiving waters. Votunre 1V-.Source Con1m1 B,t1Ps August 2Al2 2-15 • Ecology prohibits the use of motor oil for dust control- Take care when using lignin derivatives and other high BOD chemicals in areas susceptible to contaminating surface water or ground water. • Consult with Ecology and the local permitting authority on discharge permit requirements if the dust suppression process results in a wastewater discharge to the ground,ground water,storm drain,or surface hater. Recommended Additional Operational BMPs for Roadways and Other Trafficked Areas: • Consider limiting use of off-road recreational vehicles on dust generating land. • Consider graveling or paving unpaved permanent roads and other trafficked areas at municipal, commercial,and industrial areas. • Consider paving or stabilizing shoulders of paved roads with gravel, vegetation,or local government approved chemicals. • Encourage use of alternate paved routes,if available. • Vacuum sweep fine dirt and skid control materials from paved roads soon after winter weather ends or when needed. • Consider using pre-washed traction sand to reduce dust emissions. Additional Recommended Operational BMPs for Dust Generating Areas: • Prepare a dust control plan.helpful references include: Control of Open Fugitive Dust Sources(EPA-450/3-88-088),and Fugitive Dust Background Document and Technical Information Document for Best Available Control Measures(EPA-450!2-92-004). • Limit exposure of soil(dust source)as much as feasible. • Stabilize dust-generating soil by growing and maintaining vegetation, mulching,topsoiling,andlor applying stone,sand, or gavel. • Apply windbreaks in the soil such as trees,board fences, tarp curtains, bales of hay,etc. S411 BMPs for Landscaping and Lawn/Vegetation Management Description of Pollutant Sources:Landscaping can include grading,soil transfer,vegetation removal,pesticide and fertilizer applications,and watering.Stormwater contaminants include toxic organic compounds, heavy metals,oils,total suspended solids,coliform bacteria, fertilizers, and pesticides. Lawn and vegetation management can include control of objectionable weeds,insects,mold,bacteria,and other pests with pesticides. Examples include weed control on golf course lawns,access roads,and utility corridors and during landscaping.sap stain and insect control on lumber and logs.rooftop moss removal.killing nuisance rodents. fungicide application to patio decks,and residential lawmfplant care. It is possible to release toxic pesticides such as pentachlorophenol,carbamates,and organometallics to the environment by leaching and dripping from treated parts,container leaks,product misuse,and outside storage of pesticide contaminated materials and equipment.Poor management of the Volume 1V-Source C(Mtlrol BMPs--August 2012 _'-21 S413 BMPs for Log Sorting and Handling I)escription of Pollutant Sources: Log yards are paved or unpaved areas where logs are transferred,sorted,debarked,cut,and stored to prepare them for shipment or for the production of dimensional lumber,plywood, chips,poles,or other products. Log yards are generally maintained at sawmills,shipping pans,and pulp mills_Typical pollutants include oil and grease,BOD,settleable solids,total suspended solids(including soil),high and low pH,heavy metals,pesticides,wood-haled debris,and leachate The following are pollutant sources: • Log storage,rollout,sorting,scaling,and cutting areas • Log and liquid loading areas • Log sprinkling • Debarking, hark bin and conveyor areas • Bark,ash,sawdust and wood debris piles,and solid wastes • Metal salvage areas • Truck,rail,ship,stacker,and loader access areas • Log trucks,stackers,loaders,forklifts,and other heavy equipment • Maintenance shops and parking areas • Cleaning areas for vehicles,parts,and equipment • Storage and handling areas for hydraulic oils,lubricants,fuels,paints. liquid wastes,and other liquid materials • Pesticide usage for log preservation and surface protection • Application of herbicides for weed control • Contaminated soil resulting from leaks or spills of fluids Ecology's Baseline General Permit Requirements: Industries with log yards are required to obtain coverage under the Industrial Stormwater General Permit for discharges of stormwater associated with industrial activities.The permit requires preparation and on-site retention of an Industrial Stormwater Pollution Prevention Plan i plume IV-Srurrce Cibnlml B,btPs Augw; 2012 2-31 (SWPPP). Required and recommended operational,structural source control, and treatment BMPs are presented in detail in Ecology's Guidance Document: hrdu-vtrial Stormtrater General Permit h►rnlemenlation Manual far Lne Yard_v, Publication # 04-10-031. Ecology recommends that all log yard facilities obtain a copy of this document. S416 BMPs for Maintenance of Roadside Ditches Dcscription of Pollutant Sources: Common road debris including eroded soil,oils,vegetative particles,and heavy metals can be sources of stormwater pollutants. Pollutant Control Approach: Maintain roadside ditches to preserve the condition and capacity for which they were originally constructed,and to minimize bare or thinly vegetated ground surfaces.Maintenance practices should provide for erosion and sediment control(Refer to BMP Landwapine and Lau-n11'e.L-elation -Wanaeement). Volume 1V-Source Conlml BMP.r-August 7012 1-35 Applicable Operational BMPs: • Inspect roadside ditches regularly to identitj sediment accumulation and localized erasion. • Clean ditches on a regular basis,as needed. Keep ditches kee of rubbish and debris. • Vegetation in ditches-often prevent%erosion and cleanses runoff waters.Remove vegetation only when flow is blocked or excess sediments have accumulated.Conduct ditch maintenance(seeding• fertilizer application,harvesting)in late spring andi or early tall,where passible.This allows rr-establishment of'vegetative cover by the next wee season thereby minimizing erosion of the ditch as well as making the ditch et3ective as a biottlter. • In the area between the edge ofthe pavement and the bottom of the ditch,commonly known as the"bare earth zone;'use grass vegetation, wherrver possible. Establish vegetation from the edge of the pavement,ifpoe%sible,ar at least from the top of the slope of the ditch. • Maintain diversion ditches on top ofcut slopes constructed to prevent slope erosion by intercepting surlace drainage to retain their diversion shape and capability. • Do not leave ditch cleanings on the roadway surfaces_ Sweep,collect, and dispose of dirt and debris remaining on the pavement at the completion ol'ditch cleaning operations. • Consider screening madside ditch cleanings,not contaminated by %pill%or other releases and not associated with a stormwater treatment system such as a hioswale,to remove litter. Separate screenings into soil and vegetative matter(leaves,grass,ncedlcw.branches,ctc.) categories.Compost or dispose of the vegetative matter in a municip;d waste landfill.Consult with the jurisdictional health department to discuss use or disposal options iirr the soil portion_ For more in#bmmation,please sec Rer•otiiniendatirrns Jim-:Lfcaraberuenr qj Swee( if7stec,in Appendix IV G.of this volume. • Roadside ditch cleanings contaminated by spills or other releases known or suspected to contain dangerous waste must be handled 161lowing the Dativerous Waste Rceulatioxts Whanter 173 Y13 WAC1 If'testing dctermincw materials an not dangerous waste but contaminants are present,consult with the jurisdictional health department liir disposal options. • Examine culverts on a regular basis tier scour or sedimentation at the inlet and outlet.and repair as necessary.Give priority to those culverts conveying perennial and•'or salmon hearing%trearn%and culverts near streams in areas of high sediment load,such as those near subdivisions during construction. t islumr !t%-.4arrrr (rmdnl R•Nf§ 4ugiat 201_' '-36 FPA 201y-0000 Maintenance and Operation Manual (Temporary) Johns Prairie Mine Expansion — Unit 1 3500 E Johns Prairie Road Parcel No. 32009-09-02000 Mason County, Washington April 1, 2024 Project#24030 Prepared For: CLYDF ST Manke Family Resources, LLC -0 WA,SH -1 PO Box 1302 2 Shelton, Washington 98584 i443045 Prepared By: �,n��E'I STV' SS/O\,\LI o Envirotech Engineering, PLLC 4/1/24 PO Box 984 Belfair, Washington 98528 Phone: 360-275-9374 Introduction Envirotech Engineering, PLLC (Envirotech) has completed this maintenance manual for the Johns Prairie Mine Expansion — Unit 1 located at 3500 Johns Prairie Road (Parcel 32009-09-02000)in Shelton,Mason County,Washington Manual Purpose The purpose of this manual is to provide the property owner with a specific maintenance plan in order to ensure the continued proper operation of all stormwater management facilities associated with this project. Lack of maintenance could lead to local flooding, water damage, excess pollution, and/ or costly repairs or replacements of property or drainage systems. This manual is temporary for the clearing aspect of the project only. Once mining of the cleared area is completed, this manual is no longer valid. Maintenance Responsibilities Facility maintenance is ultimately the responsibility of the current property owner. At the time of completing the stormwater design, dated April 1, 2024, stormwater maintenance responsibility for this property belongs to: Manke Family Resources,LLC PO Box 1302 Shelton,Washington 98584 Maintenance Requirements The stormwater management facilities provided in Attachment A include provisions for inspection procedures and maintenance, when necessary. All stormwater facilities that were designed for are accounted for. Maintenance procedures for additional components are also provided, which consist of general practices for some of the selected drainage features for this development. Only applicable facilities and components per the stormwater design are required to be inspected and maintained. ATTACHMENT A No. 10-Filter Strips Maintenance Defect or Condition When Recommended Maintenance to Correct Component Problem Maintenance is Needed Problem (-4,11 fal Sediment Sediment depth exceeds 2 Remove sediment deposits,re-level so Accumulation on inches- slope is even and flows pass evenly through Grass strip Vegetation When the grass becomes Mow grass,control nuisance vegetation, excessively tall(greater such that flow not impeded.Grass should be than 10 inches),when mowed to a height between 3-4 inches, nuisance weeds and other vegetation starts to take over. Trash and Debris Trash and debris Remove trash and Debris from filter. Accumulation accumulated on the filter strip. Erosion/Scouring Eroded or scoured areas For ruts or bare areas less than 12 inches due to flow channelization, wide,repair the damaged area by filling with or higher flows crushed gravel.The grass will creep in over the rock in time If bare areas are large, generally greater than 12 inches wide,the filter strip should be re-graded and re- seeded For smaller bare areas,overseed when bare spots are evident F'uw;apreader Flow spreader uneven or Level the spreader and clean so that flows clogged so that flows are are spread evenly over entire filter width. not uniformly distributed through entire filter width.