36C24119R0104-0005014.pdf

PDF 3 MB Posted Sep 5, 2019

Attached to: 631-17-002 Exterior Site Improvements
Solicitation number: 36C24119R0104
Issued by: Department of Veterans Affairs Veterans Health Administration Veterans Integrated Service Network 1

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S D

DMH51

RIM:323.4

DMH50

RIM:322.5

CB204

TG:322.5WQU-2

CDS 2020-5

WATER QUALITY UNIT

RIM:321.8

WQU-1

CDS 2015-4

WATER QUALITY UNIT

RIM:320.5

CB201

TG:321.7

CB200

TG:321.7

OCS-1

TG:317.2

CB208

TG:316.7

CB207

TG:316.75

FES51

INV. 316.00

FES50

INV. 316.00

18" HDPE

12"

HDPE

12" HDPE

18" HDPE

12" HDPE

8" PVC

18" HDPE

" H

30'

LEVEL SPREADER

[9.1m]

0+00

1+00

2+00

3+00

4+00

4+40

0+00

1+00

1+91

0+00

1+00

1+72

HEALING GARDEN

BIORETENTION BASIN 'A'

BOTTOM ELEV.= 316.00

BERM ELEV. = 318.00

8" NON-PERFORATED PVC PIPE

20' LONG 10' WIDE

EMERGENCY OVERFLOW

ELEV.=317.5

6" PERFORATED PVC PIPE

UNDERDRAIN ELEV.=313.50

BOTTOM OF STONE BED ELEV.=313.00

LS 1

30' LONG LEVEL SPREADER

(INCLUDING OUTFALL STILLING BASIN)

INV IN=310.0

(REFER TO DETAIL)

RIP RAP

APRON (TYP.)

REFER TO DETAIL SHEETS FOR

ADDITIONAL INFORMATION FOR

THE LEVEL SPREADER, BERM,

OUTLET CONTROL STRUCTURE,

FLARED END SECTIONS, RIPRAP,

EMERGENCY SPILLWAY, BASIN SECTION

& CONSTRUCTION GUIDELINES

STONE BED & PERFORATED PIPE

SHALL EXTEND UNDER THE RAISED

PAVER PATIO AREA

RIP RAP

APRON (TYP.)

CONSTRUCT LEVEL SPREADER

AT LEVEL GRADE TO ENSURE

EVEN DISTRIBUTION OF

STORMWATER DISCHARGE

(ADJUST GRADE AS NECESSARY)

90' [27.4m]

100' [30.5m]

293.8'

[89.5m]

299.6'

[91.3m]

298.4'

[90.9m]

55' [16.8m]

10' [3.1m]

20' [6.1m]

10' [3m]

40' [12.2m]

10' [3m]

(TYP.)

CROSS SECTION 'B'

CROSS SECTION 'A'

HEALING GARDEN BIORETENTION BASIN 'A' PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

1.6

3.1

3.9

4.0

3.8

4.4

5.0

4.5

2.4

0.1

0+00

8.1

6.0

1+00

9.0

6.0

2+00

6.0

3+00

6.0

9.3

4+00 4+40

PROPOSED

GRADE

EXISTING

GRADE

PROPOSED

6' WIDE ADA

ACCESSIBLE

CONC WALK

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

PROPOSED

STONE

PAVER

PATIO

PROPOSED

6' WIDE ADA

ACCESSIBLE

CONC WALK

8" PVC

STA. 2+21.85

INV. 313.50

BASIN 'A' - CROSS SECTION - B PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

9.7

2.7

6.1

9.0

0.1

0+00

7.6

8.7

1+00

2.1

2.4

1+70

PROPOSED

GRADE EXISTING

GRADE

PROPOSED

6' WIDE ADA

ACCESSIBLE

CONC

WALK

12" HDPE

STA. 0+58.41

INV. 312.93

C B2

:31 6.7

.47

:31

3.0

PROPOSED

STONE

PAVER

PATIO

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

BASIN 'A' - CROSS SECTION - A PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

8.3

0.7

3.6

6.6

7.9

0+00

8.1

8.9

1+00

0.0

1.7

1+70

PROPOSED

GRADE

EXISTING

GRADE

PROPOSED

CONCRETE

STAIRS

W/HANDRAILS

PROPOSED

STONE

PAVER

PATIO

PROPOSED

6' WIDE ADA

ACCESSIBLE

CONC WALK

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

PROPOSED

6' WIDE ADA

ACCESSIBLE

CONC WALK

C B2

:31 6.7

.36

:31

3.0

Know what's below.

before you dig.Call

Feet

0 30 60

PLAN VIEW

SCALE: 1"=30'

STORMWATER BASIN INFILTRATION SURFACE

MAJOR CONTOUR (5')

MAJOR CONTOUR (1')

STORM SEWER PIPE

STORM SEWER STRUCTURES

SUBSURFACE STONE BED

SITE SYMBOL - IMPROVEMENTS

FEET

BASIN BOTTOM

ELEV.=316.00

FABRICATED TRASH GRATE

(BOLTED TO STRUCTURE)

T/G=317.20

FINISHED GRADE

(SEE PLAN)

8" CRUSHED STONE

OUTLET PIPE TO

LEVEL SPREADER (LS-1)

18" HDPE

INV.=311.50

4'x4' BOX

UNCOMPACTED

IN-SITU SOIL

18" FILTER MEDIA

(EXTEND TO TOW OF SLOPE)

BOTTOM OF FILTER MEDIA=314.50

BOTTOM OF BASIN=316.00

6" PERFORATED PVC PIPE

(PER AASHTO M252)

PERFORATED PIPE INV.=313.50

(SEE PLAN FOR LAYOUT)

2"-3" PEA STONE CHOKER

COURSE (#8 OR #9)

BOTTOM OF STONE=314.25

TOP OF STONE=314.50

WALKWAY

TOP OF BERM=318.00

FILTER FABRIC AROUND

UNDERDRAIN GRAVEL BED

(TOP, BOTTOM AND SIDES)

UNDERDRAIN GRAVEL BED

(#57 WASHED STONE)

(GRAVEL SHALL EXTEND

UNDER ENTIRE FILTER MEDIA)

BOTTOM OF STONE=313.00

TOP OF STONE=314.25

(ADDITIONAL STONE REQUIRED

AS FILL WHEN EXISTING GRADE

IS BELOW THE BOTTOM OF

STONE ELEVATION - SHALL BE FREE

DRAINING GRAVEL PER MADOT M1.04.1)

EXISTING

GRADE

BIORETENTION BASIN NOTES

1. CONTRACTOR SHALL PERFORM ALL WORK IN ACCORDANCE WITH THE STORMWATER POLLUTION PREVENTION

PLAN (SWPPP) PREPARED FOR THE PROJECT.

2. THE CONSTRUCTION OF THE TEMPORARY SEDIMENT TRAP AND BIORETENTION BASIN SHALL BE OVERSEEN BY THE

DESIGN ENGINEER OR AN APPROVED REPRESENTATIVE.

3. PRIOR TO STARTING ANY WORK ON THE SITE, THE CONTRACTOR SHALL NOTIFY THE OWNER AND SHALL INSTALL

EROSION CONTROL MEASURES AS SHOWN ON THE APPROVED PLANS. THE BIORETENTION BASIN AREA SHALL BE

UTILIZED AS A TEMPORARY SEDIMENT TRAP DURING THE CONSTRUCTION OF UP GRADIENT IMPROVEMENTS.

INITIAL EXCAVATION SHALL BE PERFORMED EARLY ON TO CONSTRUCT TEMPORARY SEDIMENT TRAP. INITIAL

EXCAVATION SHALL NOT BE CARRIED TO WITHIN ONE (1) FOOT OF THE FINAL BOTTOM ELEVATION. THE TOPSOIL

LAYER SHALL BE STRIPED AND REMOVED. IF THE STRIPING OF TOPSOIL BRINGS THE TEMPORARY SEDIMENT TRAP

TO WITHIN ONE (1) FOOT OF THE FINAL BOTTOM ELEVATION OF THE INFILTRATION ELEVATION, OVEREXCAVATION

DURING THE CONVERSION OF THE BIORETENTION BASIN SHALL OCCUR, UTILIZING FREE DRAINING GRAVEL AS FIL.

4. FOLLOWING CONSTRUCTION AND STABILIZATION OF THE UP GRADIENT PARKING IMPROVEMENTS, FINAL

CONSTRUCTION OF THE BIORETENTION MAY PROCEED. DURING CONSTRUCTION OF THE BIORETENTION BASIN, THE

INFILTRATION SURFACE OF THE BIORETENTION BASIN SHALL BE PROTECTED FROM SEDIMENTATION AND SOIL

COMPACTION. EXISTING SUBGRADE WITHIN BASIN SHALL NOT BE COMPACTED OR SUBJECT TO CONSTRUCTION

EQUIPMENT TRAFFIC. CONTRACTOR SHALL ENSURE NO CONSTRUCTION EQUIPMENT SHALL BE PERMITTED TO RUN

OVER EXCAVATED SUBGRADE, STONE AND INFILTRATION SURFACE AND/OR MEDIA.

5. EXCAVATION OF INFILTRATION AREAS SHALL BE COMPLETED FROM THE PERIMETER OF THE BASIN WHERE

POSSIBLE TO AVOID COMPACTION BY EQUIPMENT TRAFFICKING. WORK SHALL BE PERFORMED IN PHASES TO

ELIMINATE EQUIPMENT TRAFFICKING. COMPLETE EXCAVATION AND INSTALLATION OF PROPOSED MATERIALS IN

LENGTHS THAT EQUIPMENT CAN REACH WITHOUT HAVING TO WORK ON EXCAVATED SURFACE.

6. AFTER EXCAVATION OF BASIN TO INFILTRATION ELEVATION, SCARIFY EXISTING SOIL SURFACE. WHERE EROSION

OF SUBGRADE HAS CAUSED ACCUMULATION OF FINE MATERIALS AND/OR SURFACE PONDING IN THE GRADED

BOTTOM, THIS MATERIAL SHALL BE REMOVED AND THE UNDERLYING SOILS SCARIFIED TO A MINIMUM DEPTH OF SIX

(6) INCHES.

7. HALT EXCAVATION AND NOTIFY ENGINEER IMMEDIATELY IF EVIDENCE OF SINKHOLE ACTIVITY IS ENCOUNTERED

WITHIN INFILTRATION AREA.

8. INSTALL STONE BED AND PERFORATED UNDERDRAIN PIPE. WRAP UNDERDRAIN WITH FILTER FABRIC PRIOR TO

BACKFILLING. UNDERDRAIN PIPE SHALL HAVE 3/8" PERFORATIONS SPACED AT SIX (6) INCH CENTERS, MIN. FOUR (4)

HOLES PER ROW, MAX. SPACING OF UNDERDRAIN PPE IS TEN (10) FEET ON CENTER. THE STONE BED AND

PERFORATED UNDERDRAIN PIPE SHALL EXTEND UNDER THE RAISED PAVER PATIO AREA. ANY PORTION OF THE

BASIN WHERE EXISTING GRADE IS LOWER THAN THE ELEVATION OF THE PERFORATED PIPE, FREE DRAINING

GRAVEL SHALL BE USED AS FILL MATERIAL. AFTER INSTALLATION OF STONE BED, PERFORATED PIPE AND FILTER

FABRIC, INSTALL PEA STONE CHOKER COURSE.

9. BACKFILL BIORETENTION BASIN WITH SPECIFIED SOIL MIX. OVERFILLING IS RECOMMENDED TO ACCOUNT FOR

SETTLEMENT. LIGHT HAND TAMPING IS ACCEPTABLE IF NECESSARY. BOTTOM OF INFILTRATION AREA SHALL BE AT

LEVEL GRADE TO PROMOTE EVEN INFILTRATION ACROSS THE ENTIRE SURFACE. THE INFILTRATION AREA AND

PLANT GROWTH AREAS SHALL BE LOOSE AND FRIABLE, HIGH IN ORGANIC MATTER AND COMPLETED WITHOUT

COMPACTION FROM HEAVY EQUIPMENT. THE SOIL ADJACENT TO AND UNDER THE PAVER PATIO AREA SHALL NOT

BE SPECIFIED SOIL MIX, RATHER THIS AREA SHALL BE BACKFILLED AND COMPACTED SOIL FOR PURPOSES OF

STRUCTURAL SUPPORT OF THE PAVER PATIO.

10. THE SOIL MIX FOR BIORETENTION BASINS SHALL BE A MIXTURE OF SAND (40%), COMPOST (30-40%) AND TOPSOIL

(20-30%). THE SOIL MIX MUST BE UNIFORM, FREE OF STONES, STUMPS, ROOTS OR SIMILAR OBJECTS LARGER THAN

TWO (2) INCHES. CLAY CONTENT SHOULD NOT EXCEED 5%. SOIL pH SHOULD GENERALLY BE BETWEEN 5.5-6.5, A

RANGE THAT IS OPTIMAL FOR MICROBIAL ACTIVITY AND ABSORPTION OF NITROGEN, PHOSPHORUS AND OTHER

POLLUTANTS. USE SOILS WITH MINIMUM 5% ORGANIC CONTENT AND MAXIMUM 500-PPM SOLUBLE SALTS. THE SAND

COMPONENT SHALL BE GRAVELLY SAND THAT MEETS ASTM D422. THE TOPSOIL COMPONENT SHALL BE A SANDY

LOAM, LOAMY SAND OR LOAM TEXTURE. THE COMPOST COMPONENT MUST BE PROCESSED FROM YARD WASTE IN

ACCORDANCE WITH MASSDEP GUIDELINES. THE COMPOST SHALL NOT CONTAIN BIOSOLIDS.

SIEVE NO. PERCENT BY WEIGHT PASSING

2-INCH 100

INCH 70-100

INCH 50-80

40 15-40

200 0-3

11. PRESOAK PLANTING SOIL PRIOR TO PLANTING VEGETATION TO AID IN SETTLEMENT. SEED BIORETENTION BASIN

ACCORDING TO LANDSCAPE PLAN. ALL PLANT MATERIAL SHALL BE TOLERANT OF INUNDATION AND DROUGHT

CONDITIONS. NATIVE PLANT MATERIALS ARE REQUIRED.

12. LEVEL SPREADER SHALL BE INSTALLED PER DETAIL.

13. PERFORM MAINTENANCE IN ACCORDANCE WITH THE POST CONSTRUCTION OPERATION AND MAINTENANCE PLAN.

14. THE BIORETENTION BASIN SHALL NOT BE USED FOR SNOW STORAGE.

BERM SHALL HAVE IMPERVIOUS

BARRIER OR BE CONSTRUCTED

USING IMPERVIOUS SOIL PER

MASS HIGHWAY SPEC

INSTALL PERMANENT EROSION CONTROL MATTING NAG-C350 (OR EQUIVALENT)

WITH STAPLE PATTERN D, PER MANUFACTURER'S SPECIFICATIONS, OVER 4" LOAM

ACROSS CREST. INSTALL 9" DEPTH MODIFIED RIP-RAP M2.02.4 OVER 3" DEPTH 3/4" STONE

OVER FILTER FABRIC ON BACK SLOPE OF BERM EMERGENCY SPILLWAY AREA.

EMERGENCY

SPILLWAY

12" HDPE

(BOTH SIDES)

INV.=312.50

8" PVC (NON-PERFORATED)

INV.=313.50

REFER TO BERM DETAIL FOR

FURTHER INFORMATION RELATED

TO MATERIAL, DISCHARGE PIPE,

ANTI-SEEP COLLAR &

CONSTRUCTION GUIDELINES

20'

COMPACTED SUBGRADE

SPILLWAY ELEV.=317.50

BERM ELEV.=318.00

30 LF CONC. CURB (18" DEEP)

(TOP CURB ELEV.=317.50) WALKWAY ALONG BASIN BERM

(MUST BE ADA ACCESSIBLE

40'

* STONE BED & PERFORATED PIPE

SHALL EXTEND UNDER THE RAISED

PAVER PATIO AREA

AutoCAD SHX Text Drawing Title

AutoCAD SHX Text Approved: Project Director

AutoCAD SHX Text Project Title

AutoCAD SHX Text Date

AutoCAD SHX Text Location

AutoCAD SHX Text Checked

AutoCAD SHX Text Building Number

AutoCAD SHX Text Project Number

AutoCAD SHX Text Drawing Number

AutoCAD SHX Text Drawn

AutoCAD SHX Text Dwg. of

AutoCAD SHX Text Revisions:

AutoCAD SHX Text Date

AutoCAD SHX Text

CONSULTANTS:

AutoCAD SHX Text

ARCHITECT/ENGINEERS:

AutoCAD SHX Text one eighth inch = one foot

AutoCAD SHX Text

AutoCAD SHX Text three inches = one foot

AutoCAD SHX Text 6"

AutoCAD SHX Text

AutoCAD SHX Text 6"

AutoCAD SHX Text one and one half inches = one foot

AutoCAD SHX Text one inch = one foot

AutoCAD SHX Text

AutoCAD SHX Text 6"

AutoCAD SHX Text

AutoCAD SHX Text three quarters inch = one foot

AutoCAD SHX Text one half inch = one foot

AutoCAD SHX Text

AutoCAD SHX Text three eighths inch = one foot

AutoCAD SHX Text

AutoCAD SHX Text one quarter inch = one foot

AutoCAD SHX Text

VA FORM 08-6231

AutoCAD SHX Text

AutoCAD SHX Text F

AutoCAD SHX Text E

AutoCAD SHX Text D

AutoCAD SHX Text C

AutoCAD SHX Text B

AutoCAD SHX Text A

AutoCAD SHX Text

AutoCAD SHX Text Office of Construction and Facilities Management

AutoCAD SHX Text

DANIEL J. WITCZAK, P.E.

AutoCAD SHX Text

MA# 53668

AutoCAD SHX Text 9/27/2018

AutoCAD SHX Text Witczak

AutoCAD SHX Text Peters

AutoCAD SHX Text VA Medical Center Northampton

AutoCAD SHX Text Leeds, MA

AutoCAD SHX Text

AutoCAD SHX Text 631-17-002

AutoCAD SHX Text

VAPAHCS PLANNING AND ENGINEERING

AutoCAD SHX Text DANIEL J WITCZAK CIVIL No. 53668

AutoCAD SHX Text C

AutoCAD SHX Text O

AutoCAD SHX Text M

AutoCAD SHX Text O

AutoCAD SHX Text N

AutoCAD SHX Text W

AutoCAD SHX Text E

AutoCAD SHX Text A

AutoCAD SHX Text L

AutoCAD SHX Text T

AutoCAD SHX Text H

AutoCAD SHX Text O

AutoCAD SHX Text F

AutoCAD SHX Text M

AutoCAD SHX Text A

AutoCAD SHX Text S

AutoCAD SHX Text A

AutoCAD SHX Text C

AutoCAD SHX Text H

AutoCAD SHX Text U

AutoCAD SHX Text S

AutoCAD SHX Text E

AutoCAD SHX Text T

AutoCAD SHX Text S

AutoCAD SHX Text P

AutoCAD SHX Text R

AutoCAD SHX Text O

AutoCAD SHX Text F

AutoCAD SHX Text E

AutoCAD SHX Text S

AutoCAD SHX Text I

AutoCAD SHX Text O

AutoCAD SHX Text N

AutoCAD SHX Text A

AutoCAD SHX Text L

AutoCAD SHX Text E

AutoCAD SHX Text N

AutoCAD SHX Text G

AutoCAD SHX Text I

AutoCAD SHX Text N

AutoCAD SHX Text E

AutoCAD SHX Text R

AutoCAD SHX Text E

AutoCAD SHX Text G

AutoCAD SHX Text I

AutoCAD SHX Text S

AutoCAD SHX Text T

AutoCAD SHX Text E

AutoCAD SHX Text R

AutoCAD SHX Text E

AutoCAD SHX Text D

AutoCAD SHX Text

AutoCAD SHX Text Bioretention Basin 'A' Plan

AutoCAD SHX Text

AutoCAD SHX Text Exterior Site Improvements

AutoCAD SHX Text 100% Review Plans

AutoCAD SHX Text

CS166

AutoCAD SHX Text

BIORETENTION BASIN 'A'

AutoCAD SHX Text

NTS

AutoCAD SHX Text

OUTLET CONTROL STRUCTURE (OCS- 1)

AutoCAD SHX Text

NTS

AutoCAD SHX Text

BIORETENTION BASIN 'A' CROSS SECTION

AutoCAD SHX Text

NTS

AutoCAD SHX Text

BIORETENTION BASIN 'A' SPILLWAY

WETLANDS

(REGULATED)

COLLAPSED

TUNNEL

CULVERT

INSTALL

GUIDERAIL

(60 LF)

DMH56

RIM:349.4 12

" H

18" HDPE

FES3

INV. 334.00

18" HDPE

DMH54

RIM:341.3

12" HDPE

18" HDPE

CB214

TG:346.412" HDPE

CB213

TG:341.4

12" HDPE

OCS-2

TG:336.0

24" HDPE

FES4

INV. 332.50

D 12" HDPE

FES5

INV. 333.00

12" HDPE

L S

R [9

.1m

0+00

1+00

1+69

0+00

1+00

1+46

BIORETENTION BASIN 'B'

BOTTOM ELEV.=334.00

BERM ELEV. =337.00

DMH55

RIM:346.2

CB212 - NO SUMP

TG:341.1

12" HDPE

" H

CB211

TG:339.5

" H

DPE

LS 3

30' LONG LEVEL SPREADER

INCLUDING OUTFALL STILLING BASIN

INV=327.0

(REFER TO DETAIL)

20' LONG 10' WIDE

EMERGENCY OVERFLOW

ELEV.=336.5

6" PERFORATED PVC PIPE

UNDERDRAIN ELEV.=331.50

BOTTOM OF STONE BED ELEV.=331.00

CB220

TG:334.6

12"

HDPE

8" PVC

DMH74

RIM:347.3

12" HDPE

DMH73

RIM:348.7

WQU-4

CDS 2020-5

WATER QUALITY UNIT

RIM:341.0

18" HDPE

DFES4-A

INV. 332.50

RIP RAP

APRON (TYP.)

RIP RAP

APRON (TYP.)

REFER TO DETAIL SHEETS FOR

ADDITIONAL INFORMATION FOR

THE LEVEL SPREADER, BERM,

OUTLET CONTROL STRUCTURE,

FLARED END SECTIONS, RIPRAP,

EMERGENCY SPILLWAY, BASIN SECTION

& CONSTRUCTION GUIDELINES

CONSTRUCT LEVEL SPREADER

AT LEVEL GRADE TO ENSURE

EVEN DISTRIBUTION OF

STORMWATER DISCHARGE

(ADJUST GRADE AS NECESSARY)

1.7

[34 m]

7.9

[39 m]

4.1

[43

.9m

0.4

[48

.9m ] 17

6.5

[53 .8m

8'[2.4m](TYP.)

CROSS SECTION 'A'

CROSS SECTION 'B'

BIORETENTION BASIN 'B' PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

3.2

3.7

2.7

2.9

3.3

4.4

4.8

4.5

0+00

4.5

4.0

1+00

4.0

2+00

5.6

2+65

8" PVC

STA. 1+20.94

INV. 331.50

PROPOSED

GRADE

EXISTING

GRADE

10' [3m]

BERM

10' [3m]

BERM

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

BASIN 'B' CROSS SECTION -A PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

8.1

1.7

5.4

9.0

0.3

0+00

4.0

1+00

5.3

5.7

1+69

PROPOSED

GRADE

EXISTING

GRADE

10' [3m]

BERM

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

BASIN 'B' CROSS SECTION -B PROFILE

HORIZONTAL SCALE: 1'=30"

VERTICAL SCALE: 1'=3"

6.3

9.8

3.6

6.8

0+00

7.0

4.0

1+00

2.2

1+47

PROPOSED

GRADE

EXISTING

GRADE

10' [3m]

BERM

PROPOSED

6" PERFORATED PVC

PIPE UNDERDRAIN

W/STONE BED

Know what's below.

before you dig.Call

Feet

0 30 60

PLAN VIEW

SCALE: 1"=30'

STORMWATER BASIN INFILTRATION SURFACE

MAJOR CONTOUR (5')

MAJOR CONTOUR (1')

STORM SEWER PIPE

STORM SEWER STRUCTURES

SUBSURFACE STONE BED

SITE SYMBOL - IMPROVEMENTS

0 3

FEET

BASIN BOTTOM

ELEV.=334.00

FABRICATED TRASH GRATE

(BOLTED TO STRUCTURE)

T/G=336.00

FINISHED GRADE

(SEE PLAN)

8" CRUSHED STONE

OUTLET PIPE TO

LEVEL SPREADER (LS-3)

24" HDPE

INV.=331.00

4'x4' BOX

10'

UNCOMPACTED

IN-SITU SOIL

18" FILTER MEDIA

(EXTEND TO TOW OF SLOPE)

BOTTOM OF FILTER MEDIA=332.50

BOTTOM OF BASIN=334.00

6" PERFORATED PVC PIPE

(PER AASHTO M252)

PERFORATED PIPE INV.=331.50

(SEE PLAN FOR LAYOUT)

TOP OF BERM=337.00

2"-3" PEA STONE CHOKER

COURSE (#8 OR #9)

BOTTOM OF STONE=332.25

TOP OF STONE=332.50

FILTER FABRIC AROUND

UNDERDRAIN GRAVEL BED

(TOP, BOTTOM AND SIDES)

UNDERDRAIN GRAVEL BED

(#57 WASHED STONE)

(GRAVEL SHALL EXTEND

UNDER ENTIRE FILTER MEDIA)

BOTTOM OF STONE=331.00

TOP OF STONE=332.25

WALKWAY

BERM SHALL HAVE IMPERVIOUS

BARRIER OR BE CONSTRUCTED

USING IMPERVIOUS SOIL PER

MASS HIGHWAY SPEC

INSTALL PERMANENT EROSION CONTROL MATTING NAG-C350 (OR EQUIVALENT)

WITH STAPLE PATTERN D, PER MANUFACTURER'S SPECIFICATIONS, OVER 4" LOAM

ACROSS CREST. INSTALL 9" DEPTH MODIFIED RIP-RAP M2.02.4 OVER 3" DEPTH 3/4" STONE

OVER FILTER FABRIC ON BACK SLOPE OF BERM EMERGENCY SPILLWAY AREA.

EMERGENCY

SPILLWAY

12" HDPE

INV.=331.50

8" PVC (NON-PERFORATED)

INV.=331.50REFER TO BERM DETAIL FOR

FURTHER INFORMATION RELATED

TO MATERIAL, DISCHARGE PIPE,

ANTI-SEEP COLLAR &

CONSTRUCTION GUIDELINES

20'

COMPACTED SUBGRADE

6" FILTER STONE

12" RIPRAP (R-4)

SPILLWAY ELEV.=336.50

BERM ELEV.=337.00

22 LF CONC. CURB (18" DEEP)

(TOP CURB ELEV.=336.50)

NON-WOVEN GEOTEXTILE FABRIC

(MIRAFI FW300 OR EQUAL)

23'

BIORETENTION BASIN NOTES

1. CONTRACTOR SHALL PERFORM ALL WORK IN ACCORDANCE WITH THE STORMWATER POLLUTION PREVENTION

PLAN (SWPPP) PREPARED FOR THE PROJECT.

2. THE CONSTRUCTION OF THE TEMPORARY SEDIMENT TRAP AND BIORETENTION BASIN SHALL BE OVERSEEN BY THE

DESIGN ENGINEER OR AN APPROVED REPRESENTATIVE.

3. PRIOR TO STARTING ANY WORK ON THE SITE, THE CONTRACTOR SHALL NOTIFY THE OWNER AND SHALL INSTALL

EROSION CONTROL MEASURES AS SHOWN ON THE APPROVED PLANS. THE BIORETENTION BASIN AREA SHALL BE

UTILIZED AS A TEMPORARY SEDIMENT TRAP DURING THE CONSTRUCTION OF UP GRADIENT IMPROVEMENTS.

INITIAL EXCAVATION SHALL BE PERFORMED EARLY ON TO CONSTRUCT TEMPORARY SEDIMENT TRAP. INITIAL

EXCAVATION SHALL NOT BE CARRIED TO WITHIN ONE (1) FOOT OF THE FINAL BOTTOM ELEVATION. THE TOPSOIL

LAYER SHALL BE STRIPED AND REMOVED. IF THE STRIPING OF TOPSOIL BRINGS THE TEMPORARY SEDIMENT TRAP

TO WITHIN ONE (1) FOOT OF THE FINAL BOTTOM ELEVATION OF THE INFILTRATION ELEVATION. OVEREXCAVATION

DURING THE CONVERSION OF THE BIORETENTION BASIN SHALL OCCUR, UTILIZING FREE DRAINING GRAVEL AS FILL.

4. FOLLOWING CONSTRUCTION AND STABILIZATION OF THE UP GRADIENT PARKING IMPROVEMENTS, FINAL

CONSTRUCTION OF THE BIORETENTION MAY PROCEED. DURING CONSTRUCTION OF THE BIORETENTION BASIN, THE

INFILTRATION SURFACE OF THE BIORETENTION BASIN SHALL BE PROTECTED FROM SEDIMENTATION AND SOIL

COMPACTION. EXISTING SUBGRADE WITHIN BASIN SHALL NOT BE COMPACTED OR SUBJECT TO CONSTRUCTION

EQUIPMENT TRAFFIC. CONTRACTOR SHALL ENSURE NO CONSTRUCTION EQUIPMENT SHALL BE PERMITTED TO RUN

OVER EXCAVATED SURFACE, STONE AND INFILTRATION SURFACE AND/OR MEDIA.

5. EXCAVATION OF INFILTRATION AREAS SHALL BE COMPLETED FROM THE PERIMETER OF THE BASIN WHERE

POSSIBLE TO AVOID COMPACTION BY EQUIPMENT TRAFFICKING. WORK SHALL BE PERFORMED IN PHASES TO

ELIMINATE EQUIPMENT TRAFFICKING. COMPLETE EXCAVATION AND INSTALLATION OF PROPOSED MATERIALS IN

LENGTHS THAT EQUIPMENT CAN REACH WITHOUT HAVING TO WORK ON EXCAVATED SURFACE.

6. AFTER EXCAVATION OF BASIN TO INFILTRATION ELEVATION, SCARIFY EXISTING SOIL SURFACE. WHERE EROSION

OF SUBGRADE HAS CAUSED ACCUMULATION OF FINE MATERIALS AND/OR SURFACE PONDING IN THE GRADED

BOTTOM, THIS MATERIAL SHALL BE REMOVED AND THE UNDERLYING SOILS SCARIFIED TO A MINIMUM DEPTH OF SIX

(6) INCHES.

7. HALT EXCAVATION AND NOTIFY ENGINEER IMMEDIATELY IF EVIDENCE OF SINKHOLE ACTIVITY IS ENCOUNTERED

WITHIN INFILTRATION AREA.

8. INSTALL STONE BED AND PERFORATED UNDERDRAIN PIPE. WRAP UNDERDRAIN WITH FILTER FABRIC PRIOR TO

BACKFILLING. UNDERDRAIN PIPE SHALL HAVE 3/8" PERFORATIONS SPACED AT SIX (6) INCH CENTERS, MIN. FOUR (4)

HOLES PER ROW, MAX. SPACING OF UNDERDRAIN PPE IS TEN (10) FEET ON CENTER.

9. BACKFILL BIORETENTION BASIN WITH SPECIFIED SOIL MIX. OVERFILLING IS RECOMMENDED TO ACCOUNT FOR

SETTLEMENT. LIGHT HAND TAMPING IS ACCEPTABLE IF NECESSARY. BOTTOM OF INFILTRATION AREA SHALL BE AT

LEVEL GRADE TO PROMOTE EVEN INFILTRATION ACROSS THE ENTIRE SURFACE. THE INFILTRATION AREA AND

PLANT GROWTH AREAS SHALL BE LOOSE AND FRIABLE, HIGH IN ORGANIC MATTER AND COMPLETED WITHOUT

COMPACTION FROM HEAVY EQUIPMENT.