EX. CURB INLET ST5 TOP= 42.64' EX. MODIFIED … Plan...Pier 5 Pier 7 Pier 8 Pier 9 Pier 10 Pier 11 Pier 12 Pier 13 Pier 14 Pier 15 Pier 16 Pier 6 DUNCAN AVE. LESLIE AVE. BENCH 12"

0+00 0+50 1+00 1+50

40

42

44

46

38

36

PROP. 149.91' - 8" Ø SDR 26 PVC PIPE @ 1.67%

0+

00

EX.

INV

. O

UT

= 3

9.9

6'

PRO

P. IN

V.

IN=

40

.20

'

EX.

MO

DIF

IED

CU

RB IN

LET

ST

5T

OP=

42

.69

'

0+

39

.48

8"

TEE

W/

4X8

RED

UC

ER F

OR

UN

DER

DR

AIN

CO

NN

ECT

ION

INV

. =

40

.82

'

1+

40

.48

22

.5° BEN

D &

4"

CLE

AN

OU

TIN

V.

= 4

2.2

3'

1+

66

.19

INV

. O

UT

= 4

2.7

0'

PRO

P. 1

8"

PED

RN

D G

RA

TE

INLE

T

PRO

P. 1

8"

PVC

MA

NH

OLE

NYLO

PLA

ST O

R E

QU

IVT

OP=

45

.00

'

40

42

44

46

38

36

EX.

CU

RB IN

LET

ST

5T

OP=

42

.64

'PR

OP.

16

.28

' - 1

5"

Ø R

CP

@ 3

.93

%

EX.

INV

. O

UT

= 3

8.6

2'

EX./

PRO

P. IN

V.

IN=

39

.32

'

0+

16

.28

1+

57

.49

CO

NN

.U

ND

ERD

RA

IN

0+

06

.50

CO

NN

.U

ND

ERD

RA

IN

REM

OV

E EX

. 1

2"

RC

PC

OR

E D

RIL

L &

GR

OU

T 1

8"

CO

NN

.

CO

RE D

RILL &

FLEXIB

LE BO

OT

2+00

0+

02

.50

CO

NN

.U

ND

ERD

RA

IN

0+

07

.70

CO

NN

.U

ND

ERD

RA

IN

0+

03

.75

45

° BEN

D

0+

17

.50

CO

NN

.U

ND

ERD

RA

IN

0+

87

.58

CO

NN

.U

ND

ERD

RA

IN

1+

34

.98

CO

NN

.U

ND

ERD

RA

IN

DUNCAN AVE.

LESLIE AV

E.

YM

CA

PARK

ING

LOT

EX. C

ON

CRET

E WA

LK

BENC

H

EX. 4' CONCRETE WALK

EX. CONCRETE WALK

12"

EX. FH16"

WVWV WV

WV

26"

2"

6"

4"4"

12"

6"

8"

4"

24"4"

5" 3"

10"12"

4"

WMWMWM

EX. GAS VALVEWM

10"10"

10"2"

36"

28"

18"

10"

6"

10"5"

10" 10"10"

30"

10"

18"

15"

10"

10"

12"12"

24"

6"

6"

6"

6"

3"

3"

38"

6"4"

4"

SHRUB

10"

3"

4" 6"3"

4"

4"

8"

10"

5"

6"

2X4"

6"

4"

8"

10"

6"

12"

6"

4"

EX. IRRIGATION VALVE

5"8"

6"

6"

6"

6"

10"

3"

5"5"

12"

18"

16"WV

WV

4"

12"

5"

WV

6"

8"4"

8"

IPF

47

47

48

47

46

46

46

45

44

43

4241

43

44

45

46

44

44

45

47

44

4746

45

44

47

46

44

45

43

44

244.45' - EX. 10" SAN SWR @0.5% (CITY OF ALEXANDRIA)

EX. SAN. MHTOP= 43.61'

INV. IN (N)=32.65'INV. IN (E)=32.41INV. OUT=32.41'

INV. IN (N)=31.53'INV. IN (E)=31.21

EX. STM MHTOP= 42.44'INV. IN= 33.28'INV. OUT= 33.26'

EX. STM MH ST2TOP= 42.43'

INV. IN (N)= 33.29'INV. IN (E)= 34.59'INV. OUT= 33.17'

EX. CURB INLET ST4TOP= 42.64'

INV. IN = 39.32'INV. OUT= 38.62'

16.28' - EX. 12" RCPSTM SWR @ 3.93%

100.87' - EX. 27" STM SWR @0.36% (CITY OF ALEXANDRIA)

ST1

INV. IN (N)= 33.89'INV. IN (E)= 32.81'INV. OUT= 32.85'

EX. TENNIS COURTS

EX. BOLLARDS

SHRUB

SHRUB

45

EX. WATER METER

EX. IRRIGATON BOX

EX. BASEBALL FIELD

EX. ELEC. MH

EX. STADIUM LIGHT

EX. SCOREBOARD

EX. CHAINLINK FENCE

EX. 3' CHAINLINK FENCE

EX. GAS VALVE

23.28' - EX. 27" RCP STM SWR @ -0.1% (CITY)

31.90' - EX. 12" RCP STM SWR @ 12.63% (CITY)

EX. UTILITY BOW LIDTOP= 45.60'

EX. NO PARKING SIGN

EX. MHTOP= 45.08'

EX IRRIGATION CNTRL

EX. ELEC. BOX

EX. STADIUM LIGHT

EX. TIMBER RETAINING WALL

EX. STADIUM LIGHT

EX. ELEC. BOX

EX. ADA RAMP

EX. ADA RAMP

EX. ADA RAMP

EX. IRRIGATION VALVE

APPR

OX. LO

C. EX

. 12" W

ATER

MA

IN (V

A A

M W

ATER

)

EX. CURB INLET ST5TOP= 42.69'

INV. OUT= 39.96'

EX. WOODCHIP PLAY AREA

APPROX. LOC EX. GAS LINE (WASH GAS)

46

45

46

47

45

46

47

+42.29+42.51 +43.01

+43.03

+43.31

43.66 +

+43.94 +44.10

+44.52

47

47

+47.04

46

BM#1 SAN MH

TOP= 43.61'

BM#2 SAN MH

TOP= 40.51'

PROP. BMP SIGN

PROP. BMP SIGN

PROP. BMP SIGN

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/OC/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

C/O

PROP. WATER FOUNTAIN DRYWELLSEE DETAIL 3 ON SHEET L-508PROP. 9' 3" SDR 26 PVC PIPE

CONN. UNDERDRAINTO 8" PIPE

C/O

PROP. BMP SIGN

C/O

S

teps

First step for clim

bers

Transfer platform

Transfer support loop

49" H Platform

Pier 1

Pier 2

P

ier 3

8

9

Pier 4 P

ier 5

Pier 7

Pier 8

Pier 9

Pier 10

Pier 11

P

ier 12

Pier 13

Pier 14

Pier 15

Pier 16

Pier 6

DUNCAN AVE.

LESLIE AV

E.

BENC

H

12"

EX. FH16"

WVWV WV

WV

26"

2"

6"

4"4"

12"

6"

8"

4"

24"4"

5" 3"

12"

4"

WMWMWM

EX. GAS VALVEWM

10"

10"2"

36"

28"

18"

10"

6"

10"5"

10" 10"10"

30"

10"

18"

24"

6"

6"

6"

6"

3"

3"

38"

6"4"

4"

SHRUB

10"

3"

4" 6"3"

4"

4"

8"

10"

5"

6"

2X4"

6"

4"

8"

10"

6"

12"

6"

4"

EX. IRRIGATION VALVE

5"8"

6"

6"

6"

6"

10"

3"

5"5"

12"

18"

16"WV

WV

4"

12"

5"

WV

6"

8"4"

8"

47

48

47

46

46

45

44

43

4241

43

44

45

46

44

44

45

47

44

4746

45

44

47

46

44

45

43

44

244.45' - EX. 10" SAN SWR @0.5% (CITY OF ALEXANDRIA)

EX. SAN. MHTOP= 43.61'

INV. IN (N)=32.65'INV. IN (E)=32.41INV. OUT=32.41'

INV. IN (N)=31.53'INV. IN (E)=31.21INV. OUT=31.06'

EX. STM MHTOP= 42.44'INV. IN= 33.28'INV. OUT= 33.26'

EX. STM MH ST2TOP= 42.43'

INV. IN (N)= 33.29'INV. IN (E)= 34.59'INV. OUT= 33.17'

EX. CURB INLET ST4TOP= 42.64'

INV. IN = 39.32'INV. OUT= 38.62'

16.28' - EX. 12" RCPSTM SWR @ 3.93%

100.87' - EX. 27" STM SWR @0.36% (CITY OF ALEXANDRIA)

ST1

INV. IN (N)= 33.89'INV. IN (E)= 32.81'INV. OUT= 32.85'

EX. TENNIS COURTS

SHRUB

SHRUB

45

EX. WATER METER

EX. BASEBALL FIELD

EX. GAS VALVE

23.28' - EX. 27" RCP STM SWR @ -0.1% (CITY)

31.90' - EX. 12" RCP STM SWR @ 12.63% (CITY)

EX. IRRIGATION VALVE

APPR

OX. LO

C. EX

. 12" W

ATER

MA

IN (V

A A

M W

ATER

)

EX. CURB INLET ST5TOP= 42.69'

INV. OUT= 39.96'

EX. WOODCHIP PLAY AREA

APPROX. LOC EX. GAS LINE (WASH GAS)

+42.29+42.51 +43.01

+43.03

+43.31

43.66 +

+43.94 +44.10

+44.52

+47.04

BM#1 SAN MH

TOP= 43.61'

BM#2 SAN MH

TOP= 40.51'

PROP. BMP SIGN

PROP. BMP SIGN

PROP. BMP SIGN

PROP. WATER FOUNTAIN DRYWELLSEE DETAIL 3 ON SHEET L-508PROP. 9' 3" SDR 26 PVC PIPE

CONN. UNDERDRAINTO 8" PIPE

PROP. BMP SIGN

S

teps

First step for clim

bers

Transfer platform

Transfer support loop

49" H

Platform

Pier 1

P

ier 2

Pier 3

8

9

Pier 4

P

ier 5

Pier 7

Pier 8

Pier 9

Pier 10

Pier 11

P

ier 12

Pier 13

Pier 14

Pier 15

Pier 16

P

ier 6

DUNCAN AVE.

LESLIE AV

E.

YM

CA

PARK

ING

LOT

EX. C

ON

CRET

E WA

LK

BENC

H

EX. 4' CONCRETE WALK

EX. CONCRETE WALK

12"

16"

26"

2"

6"

4"4"

12"

6"

4"

24"

3"

EX. GAS VALVE

2"

36"

28"

18"

10"

6"

10"5"

10" 10"10"

30"

10"

18"

24"

6"

6"

6"

6"

3"

3"

38"

6"4"

4"

SHRUB

10"

3"

4" 6"3"

4"

4"

8"

10"

5"

6"

2X4"

6"

4"

8"

10"

6"

12"

6"

4"

5"8"

6"

6"

10"

3"

5"5"

12"

18"

16"

4"

12"

5"

6"

8"4"

8"

IPF

45

44

43

42

43

44

45

44

45

47

44

4746

45

44

47

46

44

45

43

44

244.45' - EX. 10" SAN SWR @0.5% (CITY OF ALEXANDRIA)

EX. SAN. MHTOP= 43.61'

INV. IN (N)=32.65'INV. IN (E)=32.41INV. OUT=32.41'

EX. STM MHTOP= 42.44'INV. IN= 33.28'INV. OUT= 33.26'

EX. STM MH ST2TOP= 42.43'

INV. IN (N)= 33.29'INV. IN (E)= 34.59'INV. OUT= 33.17'

16.28' - EX. 12" RCPSTM SWR @ 3.93%

100.87' - EX. 27" STM SWR @0.36% (CITY OF ALEXANDRIA)

SHRUB

SHRUB

45

EX. IRRIGATON BOX

EX. BASEBALL FIELD

EX. ELEC. MH

EX. STADIUM LIGHT

EX. SCOREBOARD

EX. CHAINLINK FENCE

EX. 3' CHAINLINK FENCE

EX. GAS VALVE

23.28' - EX. 27" RCP STM SWR @ -0.1% (CITY)

31.90' - EX. 12" RCP STM SWR @ 12.63% (CITY)

EX. UTILITY BOW LIDTOP= 45.60'

EX. NO PARKING SIGN

EX. MHTOP= 45.08'

EX IRRIGATION CNTRL

EX. ELEC. BOX

EX. STADIUM LIGHT

EX. TIMBER RETAINING WALL

EX. STADIUM LIGHT

EX. ELEC. BOX

EX. ADA RAMP

EX. ADA RAMP

EX. ADA RAMP

EX. CURB INLET ST5TOP= 42.69'

INV. OUT= 39.96'

EX. WOODCHIP PLAY AREA

APPROX. LOC EX. GAS LINE (WASH GAS)

46

45

46

47

45

4647

+42.29+42.51 +43.01

+43.03

+43.31

43.66 +

+43.94 +44.10

+44.52

47

47

+47.04

46

BM#1 SAN MH

TOP= 43.61'

PROP. BMP SIGN

PROP. BMP SIGN

PROP. BMP SIGN

PROP. WATER FOUNTAIN DRYWELLSEE DETAIL 3 ON SHEET L-508PROP. 9' 3" SDR 26 PVC PIPE

CONN. UNDERDRAINTO 8" PIPE

PROP. BMP SIGN

S

teps

First step for clim

bers

Transfer platform

Transfer support loop

49" H Platform

Pier 1

P

ier 2

Pier 3

8

9

P

ier 4 Pier 5

P

ier 7

Pier 8

Pier 9

Pier 10

Pier 11

Pier 12

Pier 13

Pier 14

P

ier 15

Pier 16

P

ier 6

Simp

sonP

laygr

ound

-bas

erev

unde

rdra

intoc

ity_jl

edits

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0726

18.dw

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SOLIC

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ION

NO.:

FILE

NAM

E:

DWN

BY:

CKD

BY:

DESI

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BY:

DESC

RIPT

ION

D

C

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MARK

APPR

.

DATE

:

FILE

NUM

BER:

SIZE

:

SUBM

ITTE

D BY

:

PLOT

SCA

LE:

PLOT

DAT

E:

DATE

CONT

RACT

NO.

:

SHEETIDENTIFICATION

CITY

OF

ALEX

ANDR

IAVI

RGIN

IA

NOT

FOR

CONS

TRUC

TION

SIMP

SON

PLAY

GROU

ND +

PAS

SIVE

LAW

N RE

NOVA

TION

421 E

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ROE

AVEN

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05 JU

LY 20

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D

LA

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R/K

LE

IN

LA

ND

SC

AP

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RC

HIT

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, P

C

81

5 N

orth

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oya

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tre

et., S

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SHEET 11 OF 31

07/05

/2017

ALEX

ANDR

IA, V

A 22

301

KES

L/KLA

EBL

L/KLA

DOMINION

SURVEYORS INC.

8808-H Pear Tree Village Court

Alexandria, Virginia 22309

Phone: (703) 619-6555

Facsimile: (703) 799-6412

Goquinn@DominionSurveyors.com

Approved Date Director of Transportation and Environmental Services

Director of Recreation, Parks and Cultural ActivitiesApproved Date

STORM SEWER PROFILESCALE: 1" = 20' HORZ

1" = 2' VERT

DRAINAGE AREA MAP - POST DEVELOPMENTSCALE: 1" = 40'

D.A. TO PROP GRATE INLETA= 0.64 ACRESC= 0.30Q2= 1.25 CFSQ10= 1.73 CFS

D.A. TO ST5A= 0.72 ACRESC= 0.37Q2= 1.73 CFSQ10= 2.40 CFS

D.A. TO CURB INLET ST4A= 0.99 ACRESC= 0.48Q2= 3.08 CFSQ10= 4.28 CFS

D.A. TO STR #2A= 1.58 ACRESC= 0.33Q2= 3.39 CFSQ10= 4.69 CFS

D.A. TO CURB INLET #1A= 0.80 ACRESC= 0.56Q2= 2.91 CFSQ10= 4.03 CFS

DRAINAGE AREA MAP - PRE DEVELOPMENTSCALE: 1" = 40'

SWM/BMP NARRATIVETHIS PROJECT PROPOSES THE RENOVATION OF A 1.17 ACRE PORTION OF SIMPSON PARK. THEEXISTING STONE DUST PATH WILL BE REMOVED, THE AREA REGRADED IN PLACES AND MULTIPLEDIFFERENT PLAY SURFACES WILL BE ADDDED. ALL THE SURFACES WILL BE PERVIOUS WITH ASTONE BASE/UNDERDRAIN AS REQUIRED. A PERVIOUS PAVER WALK WILL BE USED AS ASTRUCTURAL BMP TO MEET SWM REQUIREMENTS. THE SITE MEETS VRRM REQUIREMENTS BYREDUCING THE CN NUMBER FROM 82 IN THE PREDEVELOPED CONDITION TO 81 IN THE POSTDEVELOPED CONDITION.

USING THE RATIONAL METHOD, FOR THE STORM SEWER DESIGN, THE TEN YEAR RUNOFF TO THETHE EXISTING STORM SEWER IS REDUCED FROM 8.94 CFS TO 8.41 CFS.

OUTFALL NARRATIVETHIS PROJECT PROPOSES THE RENOVATION OF A 1.17 ACRE PORTION OF SIMPSON PARK. THEEXISTING STONE DUST PATH WILL BE REMOVED, THE AREA REGRADED IN PLACES AND MULTIPLEDIFFERENT PLAY SURFACES WILL BE ADDED. THE PIPE BETWEEN STR 5 AND STR 4 IS NOTADEQUATE IN THE EXISTING CONDITION AND SHALL BE REPLACED.

THE PROJECT AREA DISCHARGES TO THE EXISTING STORM SEWER WITHIN DUNCAN AVE. 0.99ACRES DRAINS TO DUNCAN AVE AND THEN ALONG THE GUTTER TO STORM STRUCTURE ST4.ST 4 DRAINS TO A MANHOLE THE CONNECTS TO A STORM SEWER WITH A SEWER SHED OFAPPROXIMATELY 19 ACRES TO THE NORTH. ST2 CONNECTS DOWNSTREAM TO STR1 VIA A 27"PIPE. STR 1 RECEIVES RUNOFF FROM 0.5 ACRES TO THE NORTH AND THEN DISCHARGES 450'TO THE WEST THROUGH A 27" INCH PIPE WITH AN ASSUMED SLOPE EQUAL THAT OF THE PIPEBETWEEN STR 2 AND STR 1.

THE RUNOFF FROM THE PARK HAS BEEN REDUCED. BY 0.53 CFS FOR A TEN YEAR STORM. THEEXISTING PIPE WAS ANALYZED FOR THE DOWNSTREAM 3 RUNS (150 FEET DOWNSTREAM OF THESTR2 WHICH SERVES A WATERSHED MORE THE 90% OF THE PROJECT WATERSHED. BASED UPONTHE RECORD SOURCES AND THE SURVEY PERFORMED BY THE CITY OF ALEXANDRIA, IT IS MYOPINION THAT THE EXISTING STORM SEWER MEETS THE ADEQUATE OUTFALL REQUIREMENTS OFTHE CITY OF ALEXANDRIA AND THIS PROJECT WILL NOT RESULT IN ADVERSE IMPACT ON THEDRAINAGE OF THE DOWNSTREAM DRAINAGE. THE RESULTING DISCHARGE DOES NOT CAUSEFLOODING OF THE DRAINAGE SYSTEM AND DOES NOT RESULT IN EROSIVE VELOCITIES TO THEEXISTING STORM SEWER.

THE ANALYSIS OF THE PROPOSED PARK DOES NOT INCLUDE THE DETENTION/SLOWING OF THERUNOFF THAT WILL OCCUR WITH THE PROPOSED PERVIOUS SURFACES, PEAK RUNOFF RATESFROM THE SITE WILL BE LOWER THAN THOSE SHOWN.

STORM SEWER CALCULATIONS - EXISTING OUTFALLSTORM SEWER CALCULATIONS - PROPOSED

CITY

OF ALEXANDRIA

VIRGINIA

DRAINAGE AREA IMPERVIOUS PERVIOUS TOTAL

SITE AREA (SF) 6229 44736 50965

ON-SITE TREATED (SF) 5445 0 5445

OFFSITE TREATED (SF)

TOTAL TREATED (SF) 5445

ANY ON-SITE DISCONNECTED BYA VEGETATED BUFFER (25 FT)

TOTAL ONSITE TREATED ORDISCONNECTED

5445

PROJECT DESCRIPTION

DEVELOPMENT OR REDEVELOPMENT

BMP TYPE

AREA TREATEDBY BMP (ACRES)

IMPERVIOUS AREATREATED BY BMP

(ACRES)

BMPEFFICIENCY

PERMEABLE PAVEMNT 0.1250 0.1250 25

MISCELLANEOUS

TOTAL WQV TREATED: YES NODETENTION ON SITE: YES NO

PROJECT IS WITHIN WHICH WATERSHED? TIMBER BRANCH/HOOFS RUNPROJECT DISCHARGES TO WHICH BODY OF WATER? CAMERON RUN

THIS PROJECT INVOLVES THE RENOVATION OF A PORTION OF SIMPSON PARK. THEPROPOSED PAVERS EXCEED THE WQV REQUIREMENT FOR THIS SITE.

WATER QUALITY DEFAULT VOLUMETOTAL IMPERVIOUS AREA= 6229 SQUARE FEET (0.143ACRES)

WQV= 6229 x 12" (0.0417')= 259.75 CF TOTAL

VOLUME PROVIDE IN PERMEABLE PAVER BASEIMPERVIOUS AREA TREATED: 5,453 SF (227.4 CF)AREA OF PERVIOUS PAVERS5,179 X 0.5 X 0.4= 1,036 CF

ST

OR

MW

AT

ER

M

AN

AG

EM

EN

T D

AT

A

C-006

BMP MAP - POST DEVELOPMENTSCALE: 1" = 40'

- D.A. TO PERMEABLE PAVERS - 5453 SF (0.125 AC)

- D.A. UNCONTORLLED - 45,520 SF (1.045 AC)

1. RES

PON

D C

ITY C

OM

MEN

TS

DA

TED

1/2

3/1

72/2

2/1

7

0000

0539

1612

51-0

0