36C24119R0104-0005014.pdf

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631-17-002 Exterior Site Improvements
Solicitation number
36C24119R0104
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S

D

SD

S

D

S

D

S

D

S

D

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

18" HDPE

18" HDPE

12"

HDPE

12" HDPE

12" HDPE

18" HDPE

12" HDPE

8" PVC

18" HDPE

" H

DP

E

" H

DP

E

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

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

TG

:31 6.7

ST

A:

0+

.47

IN

V.

O

UT

: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

TG

:31 6.7

ST

A:

0+

.36

IN

V.

O

UT

:31

3.0

Know what's below.

before you dig.Call

R

Feet

0 30 60

PLAN VIEW

SCALE: 1"=30'

STORMWATER BASIN INFILTRATION SURFACE

MAJOR CONTOUR (5')

SD

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)

6"

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

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text three inches = one foot

AutoCAD SHX Text 6"

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text 6"

AutoCAD SHX Text one and one half inches = one foot

AutoCAD SHX Text one inch = one foot

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AutoCAD SHX Text 6"

AutoCAD SHX Text 6"

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AutoCAD SHX Text

AutoCAD SHX Text three quarters inch = one foot

AutoCAD SHX Text one half inch = one foot

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AutoCAD SHX Text three eighths inch = one foot

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AutoCAD SHX Text one quarter inch = one foot

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VA FORM 08-6231

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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

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AutoCAD SHX Text 631-17-002

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VAPAHCS PLANNING AND ENGINEERING

AutoCAD SHX Text DANIEL J WITCZAK CIVIL No. 53668

AutoCAD SHX Text C

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AutoCAD SHX Text Bioretention Basin 'A' Plan

AutoCAD SHX Text

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AutoCAD SHX Text Exterior Site Improvements

AutoCAD SHX Text 100% Review Plans

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CS166

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BIORETENTION BASIN 'A'

AutoCAD SHX Text

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NTS

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OUTLET CONTROL STRUCTURE (OCS- 1)

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NTS

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BIORETENTION BASIN 'A' CROSS SECTION

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NTS

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BIORETENTION BASIN 'A' SPILLWAY

WETLANDS

(REGULATED)

COLLAPSED

TUNNEL

CULVERT

INSTALL

GUIDERAIL

(60 LF)

DMH56

RIM:349.4 12

" H

DP

E

S

D

S

D

S

D

S

D

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

S

D 12" HDPE

FES5

INV. 333.00

S

D

S

D

12" HDPE

LE

VE

L S

PR

EA

DE

R [9

.1m

0+

1+

2+

2+

0+00

1+00

1+69

0+00

1+00

1+46

BIORETENTION BASIN 'B'

BOTTOM ELEV.=334.00

BERM ELEV. =337.00

S

D

DMH55

RIM:346.2

S

D

CB212 - NO SUMP

TG:341.1

S

D

S

D

S

D

12" HDPE

S

D

" H

DP

E

CB211

TG:339.5

S

D

" 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

S

D

8" PVC

S

D

S

D

S

D

DMH74

RIM:347.3

12" HDPE

S

D

DMH73

RIM:348.7

WQU-4

CDS 2020-5

WATER QUALITY UNIT

RIM:341.0

18" HDPE

18" HDPE

S

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

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

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

R

Feet

0 30 60

PLAN VIEW

SCALE: 1"=30'

STORMWATER BASIN INFILTRATION SURFACE

MAJOR CONTOUR (5')

SD

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)

6"

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.

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.

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VA FORM 08-6231

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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

AutoCAD SHX Text

AutoCAD SHX Text

VAPAHCS PLANNING AND ENGINEERING

AutoCAD SHX Text DANIEL J WITCZAK CIVIL No. 53668

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AutoCAD SHX Text Bioretention Basin 'B' Plan

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CS167

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BIORETENTION BASIN 'B'

AutoCAD SHX Text

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NTS

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OUTLET CONTROL STRUCTURE (OCS- 2)

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NTS

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BIORETENTION BASIN 'B' CROSS SECTION

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%%USECTION A-A

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NTS

BIORETENTION BASIN 'B' SPILLWAY

GV

S

GV

S

W V

SMH30

SMH9

SMH8

SMH4

GRAVEL BASIN ACCESS

ABANDONED SEWER LINE

SMHABANDONED

CONC SW

S

S

S

WV

WV

WV

WV

D

D

D

D

ST

CB096

CB009

CB114

DMH029

DMH

CB012

CB011

FRONT HILL ROAD

STORMWATER BASIN

EMERGENCY

SPILLWAY

ELEV=339.70

STORMWATER

DIVERSION

CHANNEL

STORMWATER

RIPRAP CHANNEL

OUTLET CONTROL

STRUCTURE

(TOP OF CONC.

AVG. ELEV.=338.20)

24" HDPE

(SECONDARY

OUTLET)

SEDIMENT

FOREBAY

RIPRAP INLET

STORMWATER

DIVERSION

CHANNEL

24" HDPE

(PRIMARY OUTLET)

INV.=335.00

RIPRAP INLET

DMH

DMH

INV

RELOCATED

TREELINE

CB225

TG:335.6

CB012

TG:334.36

12" HDPE

CB011

TG:333.74

S

D

S

D

S

D

S

D

DMH62

RIM:343.9

24" H

DPE

24" H

DPE

SD

S D

S D

SD

36" HDPEDMH67

RIM:347.9

36" HDPE

S

D

S

D

S

D

S

D

24" HDPE

FES-ED-1

INV. 335.00

FES-ED-2

INV. 335.00

FES-ED-3

INV. 335.00

Know what's below.

before you dig.Call

R

Feet

0 30 60

PLAN VIEW

SCALE: 1"=30'

STORMWATER BASIN INFILTRATION SURFACE

MAJOR CONTOUR (5')

SD

MAJOR CONTOUR (1')

STORM SEWER PIPE

STORM SEWER STRUCTURES

SUBSURFACE STONE BED

SITE SYMBOL - IMPROVEMENTS

FEET

EXISTING INFILTRATION BASIN CROSS SECTION

CATTAILS

REPAIRED INFILTRATION BASIN CROSS SECTION

ENGINEERED SOIL MIX

(VARIABLE DEPTH)

INFILTRATION

BASIN SEED MIX

INFILTRATION BASIN NOTES

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

PLAN (SWPPP) PREPARED FOR THE PROJECT.

2. THE ENGINEER SHALL BE NOTIFIED PRIOR TO EXCAVATION OF THE EXISTING BASIN. THE ENGINEER OR AN

APPROVED REPRESENTATIVE SHALL BE ON-SITE DURING THE REPAIR OF THE BASIN.

3. THE EXISTING OUTLET CONTROL STRUCTURE SHALL BE RESET TO BE 0.3 FEET HIGHER, TO MATCH PREVIOUSLY

APPROVED BASIN DESIGN.

4. EXCAVATE BOTTOM OF EXISTING BASIN TO REMOVE THE TOP LAYER OF LOAM, WHICH IS APPROXIMATELY SIX (6)

INCHES IN DEPTH.

5. CONTINUE TO EXCAVATE BOTTOM OF EXISTING BASIN TO REMOVE ALL COMPACTED MATERIAL, WHICH WILL VARY

IN DEPTH. EXCAVATION OF INFILTRATION AREAS SHALL BE COMPLETED IN PHASES TO ELIMINATE EQUIPMENT

TRAFFICKING AND TO AVOID COMPACTION OF NEWLY EXPOSED SUBGRADE MATERIAL. HALT EXCAVATION AND

NOTIFY ENGINEER IMMEDIATELY IF EVIDENCE OF SINKHOLE ACTIVITY IS ENCOUNTERED WITHIN INFILTRATION

AREA.

6. AFTER EXCAVATION OF COMPACTED MATERIAL, 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. THE AREA OF REMOVED MATERIAL DURING EXCAVATION SHALL BE REPLACED WITH AN ENGINEERED MIX TO AN

ELEVATION SIX (6) INCHES BELOW THE EXISTING 24" HDPE DISCHARGE PIPE. 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.

8. THE SOIL MIX FOR THE INFILTRATION BASIN 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

3/4 INCH 70-100

1/4 INCH 50-80

40 15-40

200 0-3

9. PRESOAK PLANTING SOIL PRIOR TO PLANTING VEGETATION TO AID IN SETTLEMENT. SEED INFILTRATION BASIN

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

CONDITIONS. NATIVE PLANT MATERIALS ARE REQUIRED.

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

SEED MIX D - BIORETENTION & INFILTRATION BASIN BOTTOM

% OF

MIX LATIN NAME COMMON NAME CULTIVAR/

ECOTYPE

2.0 ASCLEPIAS INCARNATA SWAMP MILKWEED PA

2.0 ASTER NOVAE-ANGLIAE NEW ENGLAND ASTER PA

3.0 CHAMAECRISTA FASCICULATA PARTRIDGE PEA PA

3.0 COREOPSIS LANCEOLATA LANCE LEAF COREOPSIS ANY

20.0 ELYMUS VIRGINICUS VIRGINIA WILDRYE PA

2.0 HELIOPSIS HELIANTHOIDES OX-EYE SUNFLOWER PA

0.5 JUNCUS TENUIS PATH RUSH PA

0.7 MONARDA FISTULOSA WILD BERGAMOT

FIG(PA)

25.0 PANICUM ANCEPS BEAKED PANICGRASS MD

8.0 PANICUM RIGIDULUM REDTOP PANICGRASS PA

0.4 PYCNANTHEMUM TENUIFOLIUM NARROW LEAVED MOUNTAIN MINT PA

3.0 RUDBECKIA HIRTA BLACK EYED SUSAN ANY

25.4 SCHIZACHYRIUM SCOPARIUM LITTLE BLUSTEM CAMPER

4.0 VERBENA HASTATA BLUE VERVAIN PA

1.0 VERNONIA NPVEBORACENSIS NEW YORK IRONWEED PA

100 TOTAL

APPLY THIS MIX AT 20 LBS PER ACRE WITH 30 LBS PER ACRE OF GRAIN RYE AS A COVER CROP. BE SURE TO

TRIM THE MEADOW TO EIGHT (8) INCHES HEIGHT WHENEVER GRAIN RYE REACHES 18 TO 24 INCHES HEIGHT.

6"± LOAM

SANDY LOAM

(TO BE SCARIFIED AND REMAIN)

SANDY LOAM

(SEVERLY COMPACTED, TO BE EXCAVATED - VARIABLE DEPTH)

SANDY LOAM

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VA FORM 08-6231

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AutoCAD SHX Text Office of Construction and Facilities Management

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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

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VAPAHCS PLANNING AND ENGINEERING

AutoCAD SHX Text DANIEL J WITCZAK CIVIL No. 53668

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AutoCAD SHX Text Existing Detention Basin Plan

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10_Basin_Details_Plan-CS166 Bioretention Basin 'A' Plan
Sheets and Views
10_Basin_Details_Plan-CS166 Bioretention Basin 'A' Plan
10_Basin_Details_Plan-CS167 Bioretention Basin 'B' Plan
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10_Basin_Details_Plan-CS167 Bioretention Basin 'B' Plan
10_Basin_Details_Plan-CS168 Existing Detention Basin Plan
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10_Basin_Details_Plan-CS168 Existing Detention Basin Plan

File details come from the government source that posted it. Updated .