The URL can be used to link to this page

Home My WebLink AboutMPDES SWPPP Admin 6.18_F2/23/2019 1 BMP BREAKDOWN SECTION 6 CATEGORIES OF BMPS Design BMPs Pre-construction site planning and development to reduce erosion potential Procedural BMPs On-site handling methods and specific management Physical BMPs Erosion and Sediment Control DESIGN BMPS •MINIMIZE DISTURBANCE (FOOT PRINT) OF PROJECT. •MAXIMIZE INTEGRATION OF EXISTING LAND CONTOURS. •MINIMIZE LENGTH AND GRADIENT OF SLOPES. •ACCOUNT FOR BOTH ONSITE AND OFFSITE STORMWATERDURING CONSTRUCTION. DESIGN BMPS BMPS THAT SAVE YOU THE MOST MONEY! •ENGINEERS •CONTINGENCY SEDIMENT CONTROL PLAN •SITE PLANS •MINIMIZE DISTURBANCE •VEGETATION CLEARING AND PRESERVATION •UTILIZE NATURAL CONTOURS •TAKE PLACE BEFORE ANY WORK IS DONE ON SITE GRADING AND EXCAVATION GRADE TO YOUR ADVANTAGE HYDROEXCAVATION PROCEDURAL BMPS •TIME MAJOR SOIL DISTURBANCE FOR DRY SEASON •COMPLETE PROJECT IN PHASES •INTEGRATE EROSION CONTROL AND CONSTRUCTION SCHEDULES (THEY DON’T HAVE TO CONFLICT) Should be incorporated early in planning phases and throughout construction 1 2 3 4 5 6 2/23/2019 2 PROCEDURAL BMPS •PRE-CONSTRUCTION KICKOFF •EDUCATION •COMMON SENSE •DON’T MAKE A MESS! •PHASING AND TIMING •CLEAN UP AFTER YOURSELF! •SWEEPING •COMMUNICATION SCHEDULING FOOTBALL ANALOGY Playbook Starters Special Teams =SWPPP =Everyday onsite staff =Contracted services and vendors MATERIALS ON HAND DUST CONTROL Uncontaminated or potable water used to control dust. Minimize the amount of dust control water used. 7 8 9 10 11 12 2/23/2019 3 PHYSICAL BMPS •IMPLEMENTATION OF EROSION & SEDIMENT CONTROL PRACTICES TO THE SOIL (SECTIONS 4 AND 5). •MUST BE A SUPPLEMENT TO AND NOT A REPLACEMENT FOR DESIGN & PROCEDURAL BMPS. MAINTAIN BMPS •Purchase •Installation •Maintenance •Disposal BMP $ = EVERY BMP HAS A MAINTENANCE ELEMENT •Consider the cost •Remove all temporary BMPs at time of NOT unless bio/photo degradable Straw Blanket Wattle Gravel Filter Berm Sed Fence Straw Mulch What-Where-When? Seeding Slide courtesy of Alex Zimmerman The Right Thing In The Right Place At The Right Time EROSION CONTROL VS. SEDIMENT CONTROL •EROSION CONTROL –PREVENTION OR MINIMIZATION OF SOIL EROSION PRIMARY METHOD •SEDIMENT CONTROL –RECAPTURE ERODED SOIL BEFORE IT LEAVES THE CONSTRUCTION SITE. BACKUP OR SECONDARY METHOD PHYSICAL BMPS •SOURCE CONTROL •REDUCE EROSION •STABILIZE SOILS •SETTLE OUT SEDIMENTS •CREATE/MAINTAIN CONSTRUCTION SITE BOUNDARIES •MANAGE DISTURBED SOILS ON-SITE •RUNOFF CONVEYANCE •CONTROL FLOW OF WATER ON-SITE •ALLOW SEDIMENTS TO SETTLE •MANAGE WATER LEAVING SITE •TREATMENT •PASSIVE AND ACTIVE BMPS WORK TO… •SOAK IT IN (MULCH & SEED) •SPREAD IT AROUND (SHEET-FLOW) •SLOW IT DOWN (ROUGHENED SURFACE & CHECK DAMS) •SIFT IT OUT (PERIMETER BARRIERS) •SETTLE IT OUT (TRAPS & BASINS) 13 14 15 16 17 18 2/23/2019 4 PRESERVING NATURAL VEGETATION BUFFER ZONES HIGH VISIBILITY PLASTIC OR METAL FENCE STABILIZED CONSTRUCTION ENTRANCE RUMBLE PADS WHEEL WASH 19 20 21 22 23 24 2/23/2019 5 PROPRIETARY ENTRANCES ROAD/PARKING AREA STABILIZATION STABILIZE SOILS UNSTABILIZEDSTORAGE AREA STABILIZED STORAGE AREA EROSION PREVENTION – COVERING BMPS & WILDLIFE MANY TYPES OF COVERING BMPS •REDUCE EROSION BY STABILIZING EXPOSED SOILS IN DISTURBED AREAS •PROVIDES IMMEDIATE TEMPORARYOR PERMANENT PROTECTION FROM EROSION. STOCKPILE MANAGEMENT 25 26 27 28 29 30 2/23/2019 6 TEMPORARY AND PERMANENT SEEDING NOT ALL “HYDROSEED” PRODUCTS ARE EQUAL WHAT IS YOUR FUNCTIONAL OBJECTIVE? •RE-VEGETATION •EROSION CONTROL Category Appl. Rate (lbs/Acre)Installation Cost ($/sq.ft.)Functional Longevity % Effectiveness Dry Applied Straw 2,000 -3,000 $0.02-0.04 3-6 months (if in place)15 -40% Pelletized 1,500-2,500 $0.03-0.05 3 -6 months 40 -50% Base Hydraulic Mulch 1,500 -2,000 $0.03-0.06 < 3 months 50 -65% Terra-Matrix SMM 2,000 –3,500 $0.07–0.10 3-6 months 85 -90% Hydro-Blanket BFM 3,000 – 4,000 $0.09 -0.11 6 –12 months 90 -95% Flexterra FGM 3,000 –4,000 $0.11 -0.16 12 –18 months 99.9% CocoFlex ET-FGM 3,000 –4,000 $0.15 -0.20 18 –24 months 99.99 % Approximate Installation Costs LONGEVITY APPLICATION 31 32 33 34 35 36 2/23/2019 7 SOIL AMENDMENT DRYLAND RE VEGETATION BEFORE AFTER 6 MO THE VALUE OF SOIL TESTING •INCREASES SUCCESS RATE OF RE- VEGETATION BY 80%. •ALLOWS THE CORRECT SEED MIXES BASED ON ISSUES OR STRENGTH OF SOIL CHEMISTRY •CAN RESULT IN SUBSTANTIAL SAVINGS •VERY INEXPENSIVE OR FREE TO PERFORM WHAT TO KNOW •SOIL TEST •ACREAGE •ACCESS TO WATER •NO SEED OR SEED ($20/LB -$200/LB) •LONGEVITY •GERMINATION WINDOWS 37 38 39 40 41 42 2/23/2019 8 MULCHING STRAW MULCH COMPOST CATEGORIES OF COMPOST •SIZES •FINE •COARSE/ MEDIUM •“OVERS” •TYPES •GREEN •BROWN •BLACK Green:Nitrogen-Rich Material, microbes’ protein building block. HomeExamples:Kitchen Scraps, freshly fallen leaves/grass clippings, leafy weeds, hair (human and pets), coffee grounds, green garden trimmings.CommercialExamples:Landscaping wastes and yard waste carts Brown:Carbon-Rich Material feeds the microbes. Think of mature/processed/dried plant material.Home Examples:Old leaves (not fresh), cardboard, shredded newspaper, dried grass clippings, straw, paper towels, brown paper bags. Commercial Examples:Yard waste cart and restaurant wastes Black:Injecting a layer of microbes to speed the compost process.Home Examples:A shovel of garden soil, finished compost, composted animal manure.Commercial Examples:Biosolidincorporation COMPOST BLANKET IMPORTANT NOTES FOR MULCHING •SEEDING WINDOWS •SEED TYPE, MIX RATIO, MULCH BASE, FERTILIZER, BONDING AGENT, ETC. •THICKNESS –2 INCH MIN, INCREASE THICKNESS UNTIL 95% COVERED 43 44 45 46 47 48 2/23/2019 9 NETS AND BLANKETS INSTALLATION ROLLED EROSION CONTROL PRODUCTS Slope Channel JUTE MATTING 49 50 51 52 53 54 2/23/2019 10 TEMPORARY VS PERMANENT TEMPORARY •BIODEGRADES •EROSION PROTECTION ON SLOPES AND CHANNELS PERMANENT •MEDIA MAY BIODEGRADE BUT MESH REMAINS •PERMANENT SLOPE OR CHANNEL INTEGRITY •“GREENSCAPING” OR “SOFT INFRASTRUCTURE” •ALTERNATIVE TO CONCRETE REINFORCEMENTHow long does it need to last? How much thermal protection for the seed? Will there be sheer velocities over the face of the slope or in channel? TURF REINFORCEMENT MATS (TRM) PLASTIC COVERING PLASTIC SHEETING 55 56 57 58 59 60 2/23/2019 11 IMPORTANT NOTES FOR PLASTIC, MATS, NETS AND BLANKETS •KEEP MAT IN DIRECT CONTACT WITH SOIL SURFACE (STAPLES WORK WELL) •KEY IN AT THE TOP OF THE SLOPE •OVERLAP SIDE EDGES IF USING MULTIPLE SECTIONS •OVERLAP UP-SLOPE BLANKETS OVER DOWN-SLOPE (LIKE SHINGLES ON A ROOF) •ALWAYS PLACE MATS PARALLEL TO FLOW DIRECTION SODDING TOP SOILING Photo courtesy of Robert I. Carr, Ph.D., P.E.8 inches POLYACRYLAMIDE (PAM) SURFACE ROUGHENING https://www.youtube.com/watch?v=b8ojNgnNnkA SHEEPS-FOOT ROLLER 61 62 63 64 65 66 2/23/2019 12 GRADIENT TERRACES COMPLETION OF DAY 1 •END OF DAY 1 TOMORROW •CONVEYANCE •TREATMENT •CASE STUDIES •EXAM •EVALUATION •FIELD EXCERCISES WHAT TO BRING FOR FIELD DAY •GRUBBY CLOTHES •STURDY FOOTWEAR •GLOVES •RAIN GEAR •HAND SANITIZER WE ARE GOING TO GET DIRTY! 67 68 69