SW3171201_Plansheet - Set_20180827

Sand Filter Maintenance Tasks and Schedule

TASK

SCHEDULE
Street sweep parking lot Quarterly
Trash removal Monthly
Inspect outlet for obstructions Monthly
Inspect for clogging Monthly
Inspect inlet grates Monthly
Skim sand media Yearly
Pump oil and grit from sedimentation
chamber
Yearly or at 50% full
Replace sand media As needed (expect 3 years)
BMP Storage Volume Provided:
Elevation Surface Area Storage Total Storage
(ft) (sf) (cf) (cf)
720.5 Bottom of Stone
721.5 Top of Stone/Bottom of Sand
724.0 Top of Sand Filter/ Bottom of Extended Dry Detention Pond
724.0 3,600 00Bottom of Pond
726.0 5,600 9,200 9,200
728.0 7,800 13,400 22,600
730.0 10,300 18,100 40,700 Top of Embankment
SHWTE and groundwater @ 708.71' per Summit Geo Report letter dated 11-14-17
BMP Storage Volume Provided:
Elevation Surface Area Storage Total Storage
(ft) (sf) (cf) (cf)
724.5 Bottom of Stone
725.5 Top of Stone/Bottom of Sand
728.0 Top of Sand Filter/ Bottom of Extended Dry Detention Pond
728.0 5,300 00Bottom of Pond
730.0 13,500 18,800 18,800
732.0 17,100 30,600 49,400
734.0 20,900 38,000 87,400 Top of Embankment
SHWTE and groundwater @ 719.73' per Summit Geo Report letter dated 11-14-17
BMP Storage Volume Provided:
Elevation Surface Area Storage Total Storage
(ft) (sf) (cf) (cf)
729.5 Bottom of Stone - Provide liner per geo recommendation
730.5 Top of Stone/Bottom of Sand
733.0 Top of Sand Filter/ Bottom of Extended Dry Detention Pond
733.0 6,700 00Bottom of Pond
734.0 7,800 7,250 7,250
736.0 10,100 17,900 25,150
737.5 12,000 16,575 41,725 Top of Embankment
SHWTE and groundwater @ 733.86' per Summit Geo Report letter dated 11-14-17
No Anchor Block Required No Anchor Block RequiredNo Anchor Block Required

Wet Pond Maintenance Tasks and Schedule

TASK

SCHEDULE
Forebay inspection and cleanout Monthly inspection. Remove sediment
every 7 years or whenever the sediment
volume exceeds 50% of storage volume
Volume measurement Yearly – Dredging needed every 20 years or
when 25% of permanent pool volume has
been lost
Bank mowing and inspection / stabilization
of eroded areas
Monthly
Outlet / inlet inspection and cleanout Monthly
Unwanted vegetation and trash removal Monthly
Visual inspection of water quality Monthly
Inspect / exercise all mechanical devices,
valves, etc
Yearly
Inspect for structural damage, leaks, etc Yearly
Rodent management As needed
Security As needed
BMP Pond Storage Volume Provided:
Stage Surface Area Incremental Storage Total Storage
(ft) (sf) (cf) (cf) Notes
716.0 2,000 0 0 Bottom of Pond
718.0 11,300 13,300 13,300
720.0 13,200 24,500 37,800
722.0 15,200 28,400 66,200
722.5 (Perm. W.S.) 18,000 8,300 74,500 Top of Perm. Pool
722.5 (Perm. W.S.) 18,000 0 0 Bottom of Temp. Pool
723.0 21,400 9,850 9,850
724.0 23,500 22,450 32,300
724.5 24,600 12,025 44,325
726.0 27,900 39,375 83,700
728.0 32,400 60,300 144,000
729.0 34,800 33,600 177,600
729.5 36,200 17,750 195,350 Top of Embankment
SHWTE and groundwater @ 722.28' per Summit Geo Report letter dated 11-14-17
BMP Storage Volume Provided:
Elevation Surface Area Storage Total Storage
(ft) (sf) (cf) (cf)
753.0 50 00Bottom of Pond
754.0 5,000 2,525 2,525
756.0 7,000 12,000 14,525
758.0 23,100 30,100 44,625
760.0 58,300 81,400 126,025 Top of Embankment
No Anchor Block Required
No Anchor Block Required