121_010D_SL_closure_post_closure_plan_April_2016_REV9.pdf

DECEMBER 2010 REVISED AUGUST 2012

CLOSURE AND POST CLOSURE CARE PLAN

FORT GORDON

SOLID WASTE PERMIT NUMBER: 121-010D(SL)

17TH STREET LANDFILL AND C&D ANNEX

RICHMOND COUNTY, GEORGIA

(REVISED JUNE 2013)

(REVISED APRIL 2016)

Channel

Pipe Outlet to Well-defined

9"

Section AA

A

Plan

A

No Well-defined Channel

Pipe Outlet to Flat Area-

A

13 ft

Plan

A

Section AA

9"

13 FT

Figure 6-24.3 - RIPRAP Outlet Protection (Modified From VA SWCC)

Filter non-woven geotextile

(Mirafi 180N or equal)

Filter non-woven geotextile

(Mirafi 180N or equal)

NOTES:

1. FULL FLOW CHARACTERISTICS:

FLOW RATE (Q) = 11.61 CFS

VELOCITY (V) = 11.97 FPS

TAILWATER (Tw) = <0.5 DIA.

2. APRON DIMENSIONS:

LENGTH (La) = 11 FT

HEADWALL WIDTH (W1) = 6 FT

DOWNSTREAM WIDTH (W2) = 13 FT

AVERAGE STONE DIA. (d50) = 6 INCHES

STONE DEPTH (D) = 9 INCHES

Channel

Pipe Outlet to Well-defined

9"

Section AA

A

Plan

A

No Well-defined Channel

Pipe Outlet to Flat Area-

A

13 ft

Plan

A

Section AA

9"

13 ft

Filter non-woven geotextile

(Mirafi 180N or equal)

Filter non-woven geotextile

(Mirafi 180N or equal)

NOTES:

1. FULL FLOW CHARACTERISTICS:

FLOW RATE (Q) = 3.99 CFS

VELOCITY (V) = 8.39 FPS

TAILWATER (Tw) = >0.5 DIA.

2. APRON DIMENSIONS:

LENGTH (La) = 11 FT

HEADWALL WIDTH (W1) = 6 FT

DOWNSTREAM WIDTH (W2) = 13 FT

AVERAGE STONE DIA. (d50) = 6 INCHES

STONE DEPTH (D) = 9 INCHES

Diversion diversion pipe outlet corrugated

Stabilized stakes dike

3:1

Diversion

Hold-down

Level section

4' min

Plastic

Min. 10' spacing

Top of

Inlet Detail

Outlet Pipe

1.5' min

3:1

0.5' min fill (island) hand-compacted

Top of

4' min

1' min channel ground

Natural

Channel

Pipe Outlet to Well-defined

9"

Section AA

A

Plan

A

No Well-defined Channel

Pipe Outlet to Flat Area-

A

13 ft

Plan

A

24"

6 ft

Section AA

9"

13 ft

Filter non-woven geotextile

(Mirafi 180N or equal)

Filter non-woven geotextile

(Mirafi 180N or equal)

NOTES:

1. FULL FLOW CHARACTERISTICS:

FLOW RATE (Q) = 13.34 CFS

VELOCITY (V) = 10.7 FPS

TAILWATER (Tw) = >0.5 DIA.

2. APRON DIMENSIONS:

LENGTH (La) = 11 FT

HEADWALL WIDTH (W1) = 6 FT

DOWNSTREAM WIDTH (W2) = 13 FT

AVERAGE STONE DIA. (d50) =6 INCHES

STONE DEPTH (D) = 9 INCHES

24"

6 ft

24"

6 ft

TABLE #1

NOTES:

- AREAS WITHOUT FINAL COVER THAT WILL BE EXPOSED FOR MORE THAN 3 MONTHS WILL BE PLANTED WITH

TEMPORARY GRASS

- SEEDING RATES ARE BASED ON 100% PURE LIVE SEED SCHEDULES FROM THE MANUAL FOR EROSION AND

SEDIMENT CONTROL IN GEORGIA

- A TEMPORARY COVER SHOULD BE USED WHEN PLANTING UNHULLED BERMUDA GRASS AND PENSACOLA

BAHIAGRASS

ANNUAL RYEGRASS

TEMPORARY SEEDING

FESCUE

BERMUDA GRASS-UNHULLED

BERMUDA GRASS-HULLED

PERMANENT SEEDING

PLANTINGCOVER (INCHES)PER ACRESEEDING

PENSACOLA BAHIAGRASS

BROWNTOP MILLET

VEGETATION PLAN

DATE OFDEPTH OFPOUNDS

0.25 - 0.5

0.25 - 0.5

0.25 - 0.5

0.25 - 0.5

0.25 - 0.5

0.25 - 0.5

YEAR ROUND

3/1 - 7/1

10/1 - 3/1

8/15 - 11/1

4/1 - 7/15

8/1 - 4/15

FERTILIZER REQUIREMENTS

SPECIES

BERMUDA GRASS-HULLED

SECOND

MAINTENANCE

NOTES:

A SPLIT THE APPLICATION WHEN HIGH RATES ARE USED

B APPLY WHEN PLANT GROW TO HEIGHT OF 2 TO 4 INCHES

C APPLY IN THE SPRING AFTER SEEDING

N-P-K = NITROGEN-PHOSPHORUS-POTASH

TABLE #2

RATERATEN-P-KYEAR

TOP-DRESSINGEQUIVALENT

NITROGEN ANALYSIS OR

10-10-10

6-12-12

FIRST

6-12-12

50-100

1.500 50-100

A

MAINTENANCE

SECOND

BERMUDA GRASS-UNHULLED FIRST

6-12-12

10-10-10

6-12-12

400 30

50-100

1.500 50-100

A,C

MAINTENANCE

SECOND

PENSACOLA BAHIAGRASS FIRST

6-12-12

10-10-10

6-12-12

400 30

50-100

1.500 50-100

B

MAINTENANCE

SECOND

FESCUE FIRST

6-12-12

10-10-10

6-12-12

400 30

50-100

1.500 50-100

A

CLOSURE/POST CLOSURE PLAN

ANNUAL POST-CLOSURE CARE COST ESTIMATE

(PRE-ESTABLISHED VEGETATION)

1.

2.

3.

4.

NOTES:

MOBILIZATION LS 1 $36,000 $36,000

EARTHWORK CY 60,000 $8 $480,000

TOPSOIL CY 16,000 $16 $256,000

MATTING AND SEEDING SF 525,000 $0.26 $136,500

NOTES:

CLOSURE COST ESTIMATE

ASSUME TWO (2) FOOT MATERIAL WILL BE OBTAINED WITHIN A FIVE MILE RADIUS

ALL UNIT PRICES INCLUDE INSURANCE COSTS

ALL COSTS ARE IN 2016 DOLLARS

CLOSURE COSTS WILL BE ADJUSTED FOR INFLATION EVERY YEAR.

1.

2.

3.

ASSUMES THE DISTURBANCE OF A CUMULATIVE AREA OF 0.25 ACRES/YEAR.

ASSUMES A MOBILIZATION FEE OF $250.

ASSUMES SEMI-ANNUAL SAMPLING OF SIX SURFACE MONITORING LOCATIONS AND 16

GROUNDWATER MONITORING WELLS.

ASSUMES QUARTERLY METHANE MONITORING AT NINETEEN LOCATIONS.

ROUTINE INSPECTIONS/REPAIRS: ASSUME THE REPLACEMENT OF 0.25 ACRES OF TOPSOIL AND

CLAY MATERIAL ONCE A YEAR.

CUTTING VEGETATION AT LEAST 2 TIMES PER YEAR.

ALL COSTS ARE IN 2016 DOLLARS.

4.

6.

BMPs LS 1 $80,000

$80,000

METHANE MONITORING PROBES EA 17 $34,000

METHANE VENTS LVF 630

$120

$75,600

ENGINEERING AND CLOSURE CERT (10%) LS 1

$113,930

$113,930

SUB-TOTAL $1,255,230

SUB-TOTAL X 15% CONTINGENCY = TOTAL $188,285

TOTAL $1,443,515

7.

$2,000

GROUNDWATER MONITORING WELLS EA 9

$4,800

$43,200

ITEM UNITS QUANTITY UNIT PRICE TOTAL

REPAIR 5 ACRES OF SOIL COVER YEARLY YR 5 $20,000 $100,000

ROUTINE EROSION CONTROL YR $5,000 $150,000

MOWING 2 TIMES / YEAR YR $2,000 $60,000

SURFACE WATER MONITORING $25,000 $75,000

WATER QUALITY REPORTS

$5,000

$150,000

METHANE MONITORING $240,000

TOTAL $2,085,000

AVERAGE YEARLY COST $69,500

$8,000

ITEM UNITS QUANTITY UNIT PRICE TOTAL

MAINTENANCE

FINAL COVER REPAIR YRS 1-5

REPAIR 1 ACRE OF SOIL COVER YEARLY YR 25 $5,000 $125,000

FINAL COVER REPAIR YRS 6-30

SED POND CLEANOUT EVERY YEAR LS 30 $4,500 $135,000

SURFACE WATER MANAGEMENT

GROUNDWATER MONITORING $35,000 $1,050,000

MONITORING

YR

YR

YR

YR

5.

NSA FACILITY

5'-0"

MIN. 3'-0"