Fig 5.4 Construction Sequence 6.15.23

Figure 5.4
CONSTRUCTION SEQUENCE:
GENERAL NOTES:
1. ALL EQUIPMENT AND MATERIALS NECESSARY TO COMPLETE THE PROJECT SHALL BE MOBILIZED TO THE SITE BEFORE WORK BEGINS ON THE STREAMS.
2. SILT FENCE SHALL BE INSTALLED ALONG EDGE OF EXISTING WETLAND BOUNDARY, OUTSIDE OF LOD.
3. A PUMP -AROUND FLOW DIVERSION SHALL BE USED TO DIVERT FLOW AROUND WORK AREAS. THE PUMP -AROUND SHALL BE REMOVED FROM THE STREAM IN ADVANCE OF ANY STORM THAT WOULD EXCEED THE CAPACITY OF THE
PUMP(S). (SEE FIGURE 5.3)
4. STREAM BANKS MUST BE STABILIZED WITH SEED, MULCH AND MATTING WITHIN 24 HOURS OF REACHING FINAL GRADES. (SEE FIGURE 5.3)
5. ALL GRADED AREAS STEEPER THAN 3:1 MUST BE STABILIZED WITH SEED AND MULCH WITHIN 7 DAYS OF REACHING FINAL GRADES. ALL OTHER AREAS MUST BE STABILIZED WITHIN 14 DAYS OF REACHING FINAL GRADES
6. ALL EQUIPMENT SHALL BE CLEANED PRIOR TO MOBILIZATION AND SHALL BE MAINTAINED TO BE FREE OF LEAKS.
7. FUELING SHALL BE PERFORMED IN A CONTAINED AREA AT LEAST 200 FEET FROM FLOWING WATER.
MOBILIZATION AND SITE PREPARATION:
8. MOBILIZE EQUIPMENT AND MATERIALS TO THE SITE. CLEAR AND GRUB ACCESS PATH TO STREAM RELOCATION SITE, AS PER FIGURE 5.5. LOCATE LIMITS OF DISTURBANCE. (SURVEYING TO BE PROVIDED BY OWNER.)
9. MONITOR HAUL ROAD FOR SOIL LOSS ON A DAILY BASIS AND MAINTAIN ROAD AND GRADE OR STABILIZE WITH STONE AS NEEDED TO PREVENT SOIL LOSS.
STREAM RELOCATION:
10. CONSTRUCT SANDBAG/STONE DIVERSION BARRIERS TO INTERCEPT FLOW FROM STREAM ABOVE S1.
11. INSTALL PUMP -AROUND TO CAPTURE FLOW FROM STREAM ABOVE S1 AND DISCHARGE IT DOWNSTREAM OF S1.
12. USE TEMPORARY CULVERT TO CROSS THE STREAM TO BE RELOCATED, IF NEEDED.
13 EXCAVATE THE RELOCATED STREAM CHANNEL PER FIGURES 5.1 - 5.3, PLACING EXCAVATED SOIL WITHIN W3, S1, OR UPLAND AREAS. PROTECT EXCAVATED SOIL BY EROSION CONTROL MEASURES, AS NEEDED.
14. EXCAVATED CHANNEL SHOULD VARY IN DEPTH FROM 1.5' FROM TOP OF BANK IN RUNS (STRAIGHT SECTIONS) TO 2.5' IN POOLS (BENDS), SMOOTHING TRANSITIONS BETWEEN POOLS AND RUNS. COMPACT NEWLY FORMED STREAM BED.
15. SEED, MULCH AND PLACE MATTING OVER CONSTRUCTED STREAM BANKS.
16. FILL IN UPSTREAM END OF S1 WITH EXCAVATED WETLAND SOILS AND COMPACT TO PRE -CONSTRUCTION GRADE.
17. REMOVE PUMP AROUND SETUP TO DIRECT FLOW TOWARDS NEW STREAM CHANNEL ALINGMENT.
18. PLACE REMAINING EXCAVATED WETLAND SOILS INTO S1 AREA, SMOOTH TO PRE-CONSTURCITON GRADE. STABILIZE THE RECONCSTRUCTED WETLAND AREA WITH NATIVE WETLAND SEED MIX AND MATTING, PER FIGURE 5.4.
DEMOBILIZATION:
19. RIP, SEED AND MULCH HAUL ROAD AND STAGING AREAS, IF REMAINING EARTHWORK FOR DEVELOPMENT IS NOT CONCURRENT.
20. REMOVE TRASH AND DEBRIS FROM DISTURBED AREAS.
21 REMOVE CONSTRUCTION ENTRANCE/EXIT AND SILT FENCE(S)M, IF REMAINING EARTHWORK FOR DEVELOPMENT IS NOT CONCURRENT.
PLANTING/BIOENGINEERING:
22. NATIVE LIVE STAKES SHALL BE INSTALLED DURING THE DORMANT SEASON, GENERALLY DECEMBER THROUGH MARCH.