VGLZ182007_-_Soil_Erosion_Notes_-_12-14-2017.ppt

Soil Erosion Notes For Grounds Maintenance Selfridge Air National Guard Base, Michigan

LAND DISTURBING ACTIVITIES

LAND DISTURBING ACTIVITIES ASSOCIATED WITH THIS PROJECT WILL INCLUDE CUTTING TOPSOIL AND SUBSURFACE EARTH TO INSTALL ~1500 LINEAR FEET OF WATERLINE PIPE. EXCESS SOILS FROM BASE STOCKPILES WILL BE BROUGHT TO THE SITE AS FILL AND AS NECESSARY WILL BE USED TO GET DESIRED SLOPES TO ACHIEVE PROPER DRAINAGE. TOTAL LAND DISTURBANCE IS ANTICIPATED TO BE LESS THAN ONE ACRE. >500 FT FROM LAKE ST. CLAIR OR ANY WATERS OF THE STATE OF MICHIGAN.

PROJECT-SPECIFIC SEDIMENT CONTROL MEASURES AND MAINTENANCE

BUFFER STRIPS –

PROPOSED PLACEMENT OF SILT FENCES AND VEGETATIVE BUFFERS IS BASED ON ESTIMATED DIMENSIONS. ACTUAL PLACEMENT OF SILT FENCES AND VEGETATIVE BUFFERS WILL BE DETERMINED IN THE FIELD PRIOR TO CONSTRUCTION ACTIVITIES. SILT FENCES SHALL BE USED FOR AREAS OF SLOW FLOW LESS THAN 24 FEET IN LENGTH SLOPING DOWNSTREAM FROM CONSTRUCTION ACTIVITIES TO DRAINAGE DITCHES. VEGETATIVE BUFFERS MAY BE USED FOR AREAS OF FLOW 24 FEET IN LENGTH OR GREATER SLOPING DOWNSTREAM FROM CONSTRUCTION ACTIVITIES TO DRAINAGE DITCHES THAT MEET THE APPROPRIATE LAND SLOPE PERCENT CRITERIA (REFER TO THE TABLE BELOW) THE LENGTH OF THE AREA OF FLOW THAT IS NECESSARY FOR VEGETATIVE BUFFER USE IS DEPENDENT ON THE LAND’S SLOPE. SILT FENCES SHALL BE USED FOR AREAS OF FLOW THAT FAIL TO MEET VEGETATIVE BUFFER LAND SLOPE PERCENT CRITERIA

- FOR SLOPED THAT EXCEED 20% CONSULT NRCS TECHNICAL SPECIALIST FOR DESIGN GUIDANCE.

WHERE BUFFER STRIPS CAN NOT BE MAINTAINED AS IDENTIFIED ON THE PLANS OR WHERE THESE BUFFERS ARE DETERMINED TO BE INEFFECTIVE ADDITIONAL CONTROLS WILL NEED TO BE USED TO ADDRESS SOIL EROSION

TRACKING - THROUGHOUT THE CONSTRUCTION PERIOD, ALL MUD/SILT TRACKED ONTO ROADWAYS FROM THE SITE SHALL BE IMMEDIATELY REMOVED.

SOIL STOCK PILES – ALL STOCKPILED SOILS SHALL BE MAINTAINED TO PREVENT SOIL EROSION FROM LEAVING THE SITE. IF STOCK PILES WILL BE ON SITE FOR MORE THAN 30 DAYS, THE STOCK PILE MUST BE SEEDED, AND SILT FENCE MUST BE INSTALLED AROUND THE PERIMETER OF THE STOCK PILE, UNLESS ANOTHER METHOD FOR CONTROL IS SPECIFIED ON THE PLANS OR MODIFICATIONS TO THE PLANS APPROVED BY THE MACOMB COUNTY SOIL EROSION OFFICE.

SITE RESTORATION–

DUE TO CLOSE PROXIMITY OF THE EXCAVATION NEAR RUNWAYS AND TAXIWAYS, HYDROSEEDING MAY BE UTILIZED. THE APPROPRIATE TACKIFIER, ACCORDING TO MANUFACTURER SPECIFICATIONS, TO SUFFICIENTLY ADHERE ENDOPHYTIC FESCUE SEED TO THE EXPOSED SOIL AND NOT BECOME A FOREIGN OBJECT DEBRIS (FOD) HAZARD. WEATHER CONDITIONS (HIGH WINDS, PRECIPITATION EVENTS, ETC) SHOULD BE OBSERVED TO DETERMINE THE IDEAL CONDITIONS FOR HYDROSEEDING LOCATIONS NEAR AIRCRAFT PAVEMENTS. MULCH MATTING MAY BE UTILIZED ON EXPOSES SOIL WITH ENDOPHYTIC FESCUE SEED AWAY FROM AIRCRAFT PAVEMENTS.

DEWATERING–

DEWATERING ACTIVITIES SHALL BE COMPLETED “IN THE DRY” (AS OPPOSED TO UNDER WET CONDITIONS). ANY DEWATERING OF GROUNDWATER OR SURFACE WATER INFILTRATION INTO EXCAVATION CAVITIES DURING CONSTRUCTION ACTIVITIES SHALL BE DISCHARGED IN ADJACENT, STABILIZED VEGETATED (GRASSY) AREAS THROUGH A FILTER SOCK/DEWATERING BAG, AND ALLOWED TO INFILTRATE INTO THE SURFACE VEGETATION AND SOILS. THE FILTER SOCK/DEWATERING BAG SHALL BE PERIODICALLY MONITORED FOR FOULING OR IMPROPER OPERATIONS, AND CHANGED AS REQUIRED (WHEN THE FILTER SOCK/DEWATERING BAG IS APPROXIMATELY HALF FULL OF SEDIMENT). DISCHARGED WATER MUST NOT NEGATIVELY IMPACT SURFACE VEGETATION OR SOILS CAUSING ADDITIONAL SOIL EROSION AND SEDIMENT TRANSPORT (SCOURING). DEWATERED DISCHARGES INTO STORM WATER CATCH BASINS OR STORM WATER CONVEYANCE PATHWAYS (DRAINS OR DITCHES) SHALL NOT OCCUR, AND DEWATERED SILTS/SEDIMENTS/SANDS MUST REMAIN ON-SITE AND NOT CAUSE EROSION OR CARRY SEDIMENTS OFF-SITE.

ANY ADJACENT STORM WATER SEWER SYSTEM CATCH BASINS SHALL HAVE PROPER SILT SACKS IN-PLACE PRIOR TO SOIL DISTURBANCE ACTIVITIES. INLET FILTERS SHALL BE INSPECTED WEEKLY UNDER NORMAL CONDITIONS, WITHIN 24 HOURS OF A RAIN EVENT, AND DAILY DURING A PROLONGED RAIN EVENT. BUILDUP OF SEDIMENT AND DEBRIS SHALL BE REMOVED PROMPTLY. IF FABRIC DECOMPOSES OR BECOMES INEFFECTIVE PRIOR TO END OF EXPECTED USABLE LIFE AND THE BARRIER IS STILL REQUIRED, THE FABRIC SHALL BE REPLACED PROMPTLY. SILT SACKS WILL REMAIN IN-PLACE UNTIL SOIL DISTURBED AREAS ARE RESTORED.

SOIL EROSION AND SEDIMENTATION CONTROL MEASURES

ALL EROSION AND SEDIMENTATION CONTROL WORK SHALL CONFORM TO STANDARDS AND SPECIFICATIONS OF THE MACOMB COUNTY OFFICE OF PUBLIC WORKS IN ACCORDANCE WITH PART 91, SOIL EROSION AND SEDIMENT CONTROL, OF THE NATURAL RESOURCE AND ENVIRONMENTAL PROTECTION ACT, 1994 PA 451 AS AMENDED.

ALL APPLICABLE SOIL EROSION AND SEDIMENTATION CONTROL MEASURES WILL BE INSTALLED PRIOR TO OR IN CONJUNCTION WITH THE START OF CONSTRUCTION AND WILL REMAIN IN EFFECT UNTIL AREAS ARE STABILIZED.

ALL VEHICLE DRIVERS WILL BE INSTRUCTED TO CLEAN SOIL/MATERIALS FROM TIRES WHEN LEAVING THE SITE AND ENTERING ROAD.

INSPECTION SHALL BE MADE AS SPECIFIED ON THE PLANS TO DETERMINE THE EFFECTIVENESS OF EROSION AND SEDIMENT CONTROL WORK, AND ANY NECESSARY REPAIRS SHALL BE MADE WITHOUT DELAY.

EROSION AND SEDIMENTATION FROM WORK ON THIS SITE SHALL BE CONTAINED ON THE SITE AND NOT ALLOWED TO COLLECT ON ANY OFF SITE AREAS OR IN WATERWAYS. WATERWAYS INCLUDE BOTH MAN-MADE OPEN DITCHES, STREAMS, STORM DRAINS, LAKES AND PONDS.

THE CONTRACTOR SHALL APPLY TEMPORARY EROSION AND SEDIMENTATION CONTROL MEASURES AS REQUIRED AND AS DIRECTED ON THESE PLANS. TEMPORARY MEASURES WILL BE REMOVED AS SOON AS PERMANENT STABILIZATION OF SLOPES, DITCHES AND OTHER EARTH CHANGES HAVE BEEN ACCOMPLISHED.

DUST CONTROL MEASURES WILL INCLUDE WETTING OF UN-ESTABLISHED SOILS AS NECESSARY.

AN ESTABLISHED VEGETATIVE BUFFER STRIPS WILL BE MAINTAINED AROUND THE PERIMETER OF THE DISTURBED AREA AT ALL TIMES TO NATURALLY FILTER AS MUCH SEDIMENT AS POSSIBLE. AREAS AROUND WETLANDS WILL REQUIRE A 100-150 FOOT BUFFER STRIP.

PERMANENT SOIL EROSION CONTROL MEASURES FOR ALL SLOPES, CHANNELS, DITCHES OR ANY DISTURBED LAND AREA SHALL BE COMPLETED WITHIN 5 CALENDAR DAYS AFTER FINAL GRADING. WHEN IT IS NOT POSSIBLE TO PERMANENTLY STABILIZE A DISTURBED AREA AFTER AN EARTH CHANGE HAS BEEN COMPLETED OR WHERE SIGNIFICANT EARTH CHANGE ACTIVITY CEASES, TEMPORARY SOIL EROSION CONTROL MEASURES SHALL BE IMPLEMENTED IMMEDIATELY. ALL TEMPORARY SOIL EROSION CONTROL MEASURES SHALL BE MAINTAINED UNTIL PERMANENT SOIL EROSION CONTROL MEASURES ARE IMPLEMENTED.

WHENEVER THE COMPLETION DATE FALLS DURING A DORMANT SEASON, ADDITIONAL CONTROLS MAY BE NECESSARY. WITHIN 5 DAYS AFTER THE BEGINNING OF THE NEXT GROWING SEASON, GRASS WILL BE PLANTED.

NPDES & MACOMB COUNTY PERMIT COMPLIANCE REQUIRES WEEKLY INSPECTIONS BY A CERTIFIED STORM WATER MANAGEMENT OPERATOR AS WELL AS PERIODIC INSPECTIONS WITHIN 24 HOURS OF PRECIPITATION. THESE INSPECTIONS MAY RESULT IN RECOMMENDATIONS FOR ROUTINE MAINTENANCE OF THE SOIL EROSION CONTROL DEVICES, AS WELL AS FURTHER MAINTENANCE AS OUTLINED BELOW.

SOIL EROSION SEQUENCE OF OPERATION

SEC 1A - CATCH BASIN IN PAVED AREA

SEC 1B – CATCH BASIN IN PAVED AREA

SILT BAG/SACK IN CATCH BASINS– SEE DETAIL SEC 1A &1B

THE SILT BAG MAINTENANCE SCHEDULE (UTILIZED IN LIEU OF SILT FENCE BOX POTENTIAL FOD CONCERNS):