13-1200R-001RESIDENTIAL SWIMMING POOL • NOTES
2010, 424.2 CHAPTER
RESIDENTI& SWIMMING POOLS SHALL COMPLY WITH R4101.17.1
THE •- OF RRIER SHALL BE AT LEAST 48 INCHES ABOVE GRADE -E. ON • OF
BARRIER WHICH FACES - • I I POOL THE NM" 7- CLEARANCE E7
GRADE AND THE BOTTOM OF - - E- SHALL BE 2 INCHES R • ON u OF R- ER
WHICH FACES FROM POOL WHERE THETOP OF POOL STRUCTURE IS ABOVE
GRADE - a- MAYBE AT GROUND LEVEL OR MOUNTED ON •- OFTHE POOL STRUL7URE WHERE
BARRIER IS MOUNTED ON •• OF POOL STRUCTURE, THE MAXIMUM - CLEARANCE
BETWEEN TIE TOP OFTHE POOL STRUCTURE AND THE BOTTOM OF THE BARRIER "UBE 4 INCHES
OPENINGS - - E- SHALL NOTALLOW OFA44NCH DIAMETER SPHERE
S• • BARRIERS r •♦ NOT HAVE OPENINGS SHALL NOT CONTAIN INDENTATIONS OR PROTRUSIONS
WHERE EXCEPT FOR NORMAL CONSTRUCTION TOLERANCES AND TOOLED MASONRYJOINTS,
-r E- IS COMPOSED OF • -r• • VERTICAL MEMBERS AND THE DISTANCE
BETWEENMiTt• • -
SHALL BE LOCATED ON THE SWIMMING POOL SIDE OF THE FENCE. SPACING BETWEEN VERTICAL M0vEERS
SHALL • roa• WIDTH. E- - • rr-• r • �-
MEMBERS, SPACING WITHIN THE CUTOUTS SHALL NOT EXCEED 144 INCHES IN WIDTH.
WHERE THE BARRIER IS COMPOSED OF HORIZONTALANDVERTICAL MEIVIBERS AND THE DISTANCE
BETWEEN THE TOPS OF •-a • NTAL MEMBERS IS 45 INCHES OR MORE, > VERTICAL E -ti SHALL NOT ray• • INCHES; WHERE THERE R DECORATIVE CUrOUTS WITHIN VERTICAL
MAXIMUM MEMBERS, SPACING WITHIN THE CUTOL)TS SHALL NOT EXCEED I-W4 M>IES IN WIDTH.
ri FOR « r CH SQUARE UNLESS THE FENCE
SITE PREPARATION
1.EXCAVATION SHALL REMOVE ALL GRASS. WEEDS, ROOTS, AND ANY DEBRIS..
2. EXISTING SOFT SILT AND ORGANIC SOIL LAYER SHALL BE REMOVED AND REPLACED WITH
STRUCTURAL FILL.
3. SAND AND LIME ROCK SOIL CAN BE STOCKEDPILED AND USED AS BACKFILL.
4. ONCE THE ORGANIC LAYER HAS BEEN REMOVED, THE DEMUCKED SURFACE SHALL BE
COMPACTED.
5. FILL THEM IN LIFTS NOT EXEEDING 12 INCHES IN LOOSE THICKNESS.
6. EACH LIFT SHALL BE THOROUGHLY COMPACTED WITH VIBRATORY COMPACTION
EQUIPMENT.
7. FILL SHALL CONSIST OF CLEAR SAND AND LIME STONE OR GRAVEL. FILL MATERIAL SHALL
HAVE A MAXIMUM PARTICLE SIZE OF 3" AND NO MORE THAN 10 % PASSING THE No. 200
SIEVE.
SOIL STATEMENT;
FOUNDATION SYSTEM HAS BEEN DESIGNED USING A PRESUMPTIVE LOAD - BEARING
CAPACITY OF 2000 PSF. THE SOIL COMPOSITION AT THE SITE CONSISTS OF LIMEROCK MIXED
WITH SANDY MATERIAL. AT THE TIME OF CONSTRUCTION AND AFTER THE GROUND HAS BEEN
BROKEN A LETTER WILL BE SUBMITTED TO THE BUILDING OFFICIAL ATTESTING THAT A
REGISTER PROFESSIONAL ENGINEER OR ARCHITECT HAS OBSERVED THE SITE AND THE SOIL
CONDITIONS ARE SIMILAR TO THOSE UPON WHICH THE DESIGN WAS BASED.
LEGAL DESCRIPTION:
36 54 40 MAP OF LARKINS PINES PB 24 -20 LOT 18 & N1/2 LOT 17
BLK 3 LOT SIZE 75.000 X 140 OR 27674 -1626 041101
ACCORDINGTO THE PLAT THEREOF AS RECORDED IN PLAT
BOOK , PAGE OF THE PUBLIC_ RECORDS OF MIAMI DADE
COUNTY, FLORIDA.
LEGEND
BARRIER SCHEDULE BARRIER DESCRIPTION
RESIDENTIAL SWIMMING POOLS
SHALL COMPLY WITH * � ALARM ALL WINDOWS AND DOORS
F.B.C.R4101.17.1 THROUGH R4101.17.1. C.L.F 6' HIGH AROUND PROPERTY
O DECK BY OTHERS
UNLESS THERE IS AN EXISTING FENCE
( COMPL YING WI TH F.B.R.C. 2010, 4242 CHAPTER 41.)
A _ q
# 8 C.U. _APPROVED
SOLID FOR 7:P.ECT
B BURIAL -�
# 8 SOLID C.U. r -
18" MIN. TO 24" _ 'A C �-- ( n ^
MAX. FROM I
CONTOUR OF POOL A- _ -SPLIT B'--? La _A
POOL 360 B STEEL B
REBAR APPROVED
DEGREES WITH 4 CLAMP
EQUAL BONDING STEEL
POINTS TO THE
POOL STEEL 6 g
DEPTH MIN.
#8
B
A # 8 C.U.
SAME LEVEL ,-SOLID
& TRENCH AS SUPLY
& RETURN WATER PIPE POOL
TO PUMP EQUIP.
ALTERNATE DESIGN EQUAL TO THE
EQUIPOTENTIAL BONDING GRID REQUIREMENTS
OF THE 2010 EDITION N.E.C. 680.26 (C)
�3 NEW SWIMMING POOL & SPA
EXIST. 6' HIGH WALL .- 1AFTrq. dN TI-IWAI fNA fam
+(1)#6GIN3/4 "C
PROVIDED WITH SLATS FASTENED AT THE TOP OR BOTTOM WHICH REDUCE THE OPENINGS TO NO MORE
FLOW
THAN 1-N4INC HES.
1 SET(3- #3 THWN Cu)
HP
WHERE THE BARRIER IS COMPOSED OF DIAGONAL MEMBERS, THE MAXIMUM OPENING FORMED BY THE
SIZES
LENGTH
DIAGONAL MEMBERS SHALL BE NO MORE THAN 1-&4 INCHES.
115 9Pm
11"
° ACCESS GATES SHALL COMPLY WITH THE REQUIREMENTS OF R4101.17.1 THROUGH R4101.17.1.8 AND
-VENT IS DESIGNED TO EVACUATE
EXISTING SERVICE 1 SET(3- #1/0 THWN Cu)
SHALL BE EQUIPPED TO ACOOW"ATE A LO(NNG DEVIC,'E. PEDESTRIAN ACCESS GATES SHALL OPEN
A NON- MECHANICAL VENT SYSTEM THAT
WILL LIMIT THE TRANSMISSION OF
OUTWARD AWAY FROM THE POOL AND SHALL BE SELF - CLOSING AND HAVE A SELF- LATCHING DEVICE.
AS DIRECTED BY FPL + (1) #6 G IN 314"C
W
GATES OTHER THAN PEDESTRIAN ACCESS GATES SHALL HAVE A SELF- LATCHING DEVICE. WHERE THE
RELEASE MECHANISM OF THE SELF - LATCHING DEVICE IS LOCATED LESS THAN 54 INCHES FROM THE
BOTTOM OF THE GATE, THE RSEASE MECHANISM SHALL BE LOCATED ON THE POOL SIDE OF THE GATE AT
LEAST 3 INCHES BELOW THE TOP OF THE GATE, AND THE GATE AND BARRIER SHALL HAVE NO OPENING
GREATER THAN 1)2 INCH WITHIN 18 INCHES OF THE RELEASE MECHANISM
125 AMPS
WHERE A WALL OF A DWELLING SERVES AS PART OF THE BARRIER, ONE OF THE FOLLOWING SHALL
APPLY;
a
1. ALL DOORS WITH DRECTACCESS TO THE POOL THROUGH THAT WALL SHALL BE EQUIPPED WITH AN
MACHINE 1201240V
ALARM WHICH PRODUCES AN AUDIBLE WARNING WHEN THE DOOR AND ITS SCREEN ARE OPENED. THE
ALARM SHALL SOUND CONTINUOUSLY FOR A MINIMUM OF 30 SECONDS IMMEDIATELY AFTER THE DOOR IS
` 1 PHASE
125E . EXISTING. NEW NEW 3 WIRES
r
CD
OPENED AND BE CAPABLE OF BEING HEARD THROUGHOUT THE HOUSE DURING NORMAL. HOUSEHOLD
ACTIVITIES. THE ALARM SHALL AUTOMATICALLY RESET UNDER ALL CONDITIONS. THE ALARM SHALL. BE
N
EQUIPPED WITH A MANUAL. MEANS TO TEMPORARILY DEACTIVATE THE ALARM FOR A SINGLE OPENING.,
10�.q
SUCH DEACTIVATION SHALL LAST NO MORE THAN 15 SECONDS. THE DEACTIVATION SWITCH SHALL. BE
EXIST. 6'1
LOCATED AT LEAST 54 INCHES ABOVE THE THRESHOLD OF THE DOOR
WOOD FE
O
2 OTHER MEANS OF PROTECTION, SUCH AS SELF - CLOSING DOORS WITH SELF - LATCHING DEVICES OR
DOORS WITH POSITIVE MECHANICAL LATCHING LOOKING DEVICES INSTALLED A MINIMUM 54 INCHES ABOVE
�
Z to
THE TI RESHOLD, WHICH ARE APPROVED BY THE ADMINISTRATIVE AUTHORITY, SHALL BE ACCEPTED
1201240V 120/240V
WHERE AN ABOVEGROUND POOH- STRUCTURE IS USED AS A BARRIER OR WHERE THE BARRIER IS
MOUNTED ON TOP OF THE POOL STRUCTURE, AND THE MEANS OF ACCESS IS A LADDER OR STEPS, THE
z # 12 THHN (P & N) 75 W
DISC /PANEL 1 PHASE 1 PHASE 12a1 2V 1 12 #IN
LADDER OR STEPS EITHER SHALL BE CAPABLE OF BEING SECURED, LOCKED OR REMOVED TO PREVENT
ACCESS, OR THE LADDER OR STEPS SHALL_ BE SURROUNDED BY BARRIER WHAT MEETS THE
W (L
REQUIREMENTS OF R4101.17.1.1 THROUGH R4101.17.1.10 WHEN THE LADDER OR STEPS ARE SECURED,
1 PHASE
LIGHT
LOCKED OR REMOVED, ANY OPENING CREATED SHALL NOTALLOW THE PASSAGE OF A4 INCH DIAMETER
SPHERE
3WIRES
g It
INDOOR SWIMMING POOLS. ALL WALLS SURROUNDING INDOOR SWIMMING POOLS SHALL COMPLY WITH
R4101.17.19
PRO H BITED LOCATIONS. BARRIERS SHALL BE LOCATED SO AS TO PROHIBIT PERMANEM STRUCTURES,
1 #12THHN G o JB 75W
\BY
EQUIPMENT OR SIMILAR OBJECTS FROM BEING USED TO CLIMB THE BARRIERS.
CONTRACTOR SHALL. VERIFIED ALL DIMENSIONS AND CONDITIONS ON THE DRAWING AT THE JOB SITE
1 #21N 1" C w 1!2' COLD SPA COLOR
\y'
�
REPORTING ANY INCANSISTENCI(TO THEARC HITECTIENGINEER PRIORTO ANY CHANGE REQUIERED,
OTHERWISE THE CONTRACTOR SHALL BEAR FULL RESPONSIBILITY OF SUCH CHANGES AND ANY
REQUEED REVISION TO THE PLAN,
POOL GENERAL NOTES.
1. SWIMMING POOL WAS DESIGNED ACCORDING TO 1 AND ANSMSPI-8, ANSMSPI-6
2 REINFORCING BARS TO BE NEW BILLET GRADE CONFORMING TO ASTM A•615. GRADE 60
dj> ��'�
3. POOL BUILDER TO FOLLOW FLOTATION ANALYSIS AS INDICATED.
125
4. ALL POOL PIPING TO BE PVC SCHEDULE 40 AND BEAR THE NFS APPROVAL
E. P1
5. DISPOSAL OF POOL WATER WITHIN LOT LINES AND SUCH POUNDING SHALL NOT PERSIST FOR MORE
PAN
THAN ONE HOUR DISCHARGE
6. WATER SU'PLYAND DISPOSAL SHALL BE INSTALLED IN AWAY SO THA THERE IS NOT CROSS
O: 21 Z
w;
CONNECTION WITH A DOMESTIC WATER SUPPLY OR WATER DISPOSAL SYSTEM.
`4�
5 in
7, GRATE AT MAIN DRAIN SHALL HAVE A FREE AREA FOUR TIMES THE AREA OF SUCTION LINE
D��y�```
- &I-IALRN41) LINT STRAINERS SHALL HAVE REMOVAL SCREEN WITH A FREE AREATHREE TIMES THE
AREA OF THE SUCTION LINE (4'UTA MIN.}
9. ALL FLOOR & WALLS OF PO(7. TO BE PNEUMATICALL.YAPPLIED CONC. WITH A MIN. 28 DAY COMPRESSIVE
STRENGTH OF 3000 P.S.I.
10. ALL POOL PIPING TO BE SCHEDULE 40 PVC NON THREADED NSF PIPE WITH SOLVENT WELD JOINT'S.
11. IN ALL CASES, THE POOL CONTRACTOR SHALL TAKE ALL PRECAUTIONS TO PROTECT EXISTING
STRUCTURES FROM FA ARE BY SHEATHING WNDIOR SHORING, OR OTHER METHODS AS REQUIRED. THE
DESIGN ENGINEER ACCEPTS NO RESPONSIBILITY FOR THE SAFETY OF EXISTING STRUCTURES.
12 THE DESIGN ENGINEER ASSUMES NO RESPONSIBILITY FOR POOL CONSTRUCTION IN EASEMENT OR
REQUIRED SETBACKAREAS. PLAT PLANS NOT PREPARED FROM LEGAL SURVEYS OF THE EXISTING LOT
AND RESIDENCE ARE SO INDICATED. POOL CONTRACTOR SHALL VERIFYALL DIMENSIONS IN THE FEW
AND ESTABLISH LOT LINES. IF NECESSARY, POOL CONTRACTORANDIOR OWNER SHALL VERIFYSHOWN
AND ALL DIMENSIONS PRIOR TO CONSTRUCTION.
13. DO NOT DRAIN POOL UNDER HIGH GROUNDWATER OR STORM CONDITIONS.
14. TEMPERATURE OF SPA WATER SHALL BESET SO THAT MAXIMUM WATER TEMPERATURE DOLES NOT
EXCEED 102 DEGREES FAHRENHETT.
EXIST. 6' WOI
ELECTRICAL NOTES.
FENCE
S ELF -CLOS I N(
1. INSTALL WIRING AND DEVICES AS INDICATED IN POOL ELECTRICAL SCHEMATIC DIAGRAM. INSTALL
SELF- LATCHII
DISCONNECT SWITCH AT MOTOR IF NOT WITHIN 5(1' OF FUSED SWITCH AT SERVICE POINT. ELECTRICAL.
GA
LIGHT CONNECTION TO COMPLY WITH NEC 660 -1575 ART. 680.
2 ALL METALLIC PARTS OF THE WATER STRUCTURE, INCLUDING CONDUITS, PIPING SYSTEM,
REINFORCING STEEL OF THE POOL SHELL, COPING STONES, DECK, FIXTURE HOUSING, LADDERS AND
THEIR SUPPORTS SHALL BE BONDED TO A COMMON BONDING GRID AND GROUNDED TO A COMMON
GROUND B=26(C)]. BOUNDING CONDUCTORS SHAW- NOT BE SMALLER THAN A#8 COPPER WIRE
3. NO RECEPTACLES SHALL BE INSTALL WITHIN 10 OF DISTANCE OF WATER EDGE
4. ALL DISCONNECTING MEANS [ARTICLE 404] AND SWITCHES MUST BE LOCATED AT LEAST5 FT.
HORIZONTALLY FROM THE INSIDE WALLS OF A POOL UNLESS SEPARATED FROM THE POOL BY A SOLID
FENCE, WALL, OR OTHER PERMANENT BARRIER 168022(C)]
SITE PREPARATION
1.EXCAVATION SHALL REMOVE ALL GRASS. WEEDS, ROOTS, AND ANY DEBRIS..
2. EXISTING SOFT SILT AND ORGANIC SOIL LAYER SHALL BE REMOVED AND REPLACED WITH
STRUCTURAL FILL.
3. SAND AND LIME ROCK SOIL CAN BE STOCKEDPILED AND USED AS BACKFILL.
4. ONCE THE ORGANIC LAYER HAS BEEN REMOVED, THE DEMUCKED SURFACE SHALL BE
COMPACTED.
5. FILL THEM IN LIFTS NOT EXEEDING 12 INCHES IN LOOSE THICKNESS.
6. EACH LIFT SHALL BE THOROUGHLY COMPACTED WITH VIBRATORY COMPACTION
EQUIPMENT.
7. FILL SHALL CONSIST OF CLEAR SAND AND LIME STONE OR GRAVEL. FILL MATERIAL SHALL
HAVE A MAXIMUM PARTICLE SIZE OF 3" AND NO MORE THAN 10 % PASSING THE No. 200
SIEVE.
SOIL STATEMENT;
FOUNDATION SYSTEM HAS BEEN DESIGNED USING A PRESUMPTIVE LOAD - BEARING
CAPACITY OF 2000 PSF. THE SOIL COMPOSITION AT THE SITE CONSISTS OF LIMEROCK MIXED
WITH SANDY MATERIAL. AT THE TIME OF CONSTRUCTION AND AFTER THE GROUND HAS BEEN
BROKEN A LETTER WILL BE SUBMITTED TO THE BUILDING OFFICIAL ATTESTING THAT A
REGISTER PROFESSIONAL ENGINEER OR ARCHITECT HAS OBSERVED THE SITE AND THE SOIL
CONDITIONS ARE SIMILAR TO THOSE UPON WHICH THE DESIGN WAS BASED.
LEGAL DESCRIPTION:
36 54 40 MAP OF LARKINS PINES PB 24 -20 LOT 18 & N1/2 LOT 17
BLK 3 LOT SIZE 75.000 X 140 OR 27674 -1626 041101
ACCORDINGTO THE PLAT THEREOF AS RECORDED IN PLAT
BOOK , PAGE OF THE PUBLIC_ RECORDS OF MIAMI DADE
COUNTY, FLORIDA.
LEGEND
BARRIER SCHEDULE BARRIER DESCRIPTION
RESIDENTIAL SWIMMING POOLS
SHALL COMPLY WITH * � ALARM ALL WINDOWS AND DOORS
F.B.C.R4101.17.1 THROUGH R4101.17.1. C.L.F 6' HIGH AROUND PROPERTY
O DECK BY OTHERS
UNLESS THERE IS AN EXISTING FENCE
( COMPL YING WI TH F.B.R.C. 2010, 4242 CHAPTER 41.)
A _ q
# 8 C.U. _APPROVED
SOLID FOR 7:P.ECT
B BURIAL -�
# 8 SOLID C.U. r -
18" MIN. TO 24" _ 'A C �-- ( n ^
MAX. FROM I
CONTOUR OF POOL A- _ -SPLIT B'--? La _A
POOL 360 B STEEL B
REBAR APPROVED
DEGREES WITH 4 CLAMP
EQUAL BONDING STEEL
POINTS TO THE
POOL STEEL 6 g
DEPTH MIN.
#8
B
A # 8 C.U.
SAME LEVEL ,-SOLID
& TRENCH AS SUPLY
& RETURN WATER PIPE POOL
TO PUMP EQUIP.
ALTERNATE DESIGN EQUAL TO THE
EQUIPOTENTIAL BONDING GRID REQUIREMENTS
OF THE 2010 EDITION N.E.C. 680.26 (C)
�3 NEW SWIMMING POOL & SPA
EXIST. 6' HIGH WALL .- 1AFTrq. dN TI-IWAI fNA fam
+(1)#6GIN3/4 "C
FLOW
VENT
1 SET(3- #3 THWN Cu)
HP
RATE
SIZES
LENGTH
+(1)#8GIN3/4 "C
115 9Pm
11"
. _ -62LF
-VENT IS DESIGNED TO EVACUATE
EXISTING SERVICE 1 SET(3- #1/0 THWN Cu)
E-
A NON- MECHANICAL VENT SYSTEM THAT
WILL LIMIT THE TRANSMISSION OF
SUCTION AT THE OUTLET TO A MAXIMUM
AS DIRECTED BY FPL + (1) #6 G IN 314"C
W
125 AMPS
sALr DISC./PANEL
a
MACHINE 1201240V
WQ
` 1 PHASE
125E . EXISTING. NEW NEW 3 WIRES
r
CD
PANEL A. PANEL C.
PANEL B.
N
10�.q
METER 2 # 12 THHN (P) OOL PUMP
125 AMPS 100 AMPS X20A TIMER 1 # 1z THHN G VARIABLE SPEED
1
❑
O
. DISC./PANEL DISC./PANEL
IN 1/2' COLD 3 HP, 230V
�/
�
Z to
1201240V 120/240V
z # 12 THHN (P & N) 75 W
DISC /PANEL 1 PHASE 1 PHASE 12a1 2V 1 12 #IN
3 WIRES 3 WIRES BX 15A SW TR NSWF
a 1/2" COLD ° dB COLOR
W (L
1 PHASE
LIGHT
Z
3WIRES
g It
z #1zrHHN(PaN)
1 #12THHN G o JB 75W
\BY
1 #21N 1" C w 1!2' COLD SPA COLOR
\y'
�
LIGHT
OTHERS
ONNECTED TO BUILDING FOOTING o GFI RECEPTACLE WET NICHE
10' MIN 20' MAX APPROVED FLEXIBLE
rF SERVICE REINFORCING BAR BONDED TO c FROM WATERLINE CORD b (1)#8 (G)
,'E (3- #4/0 THWN Cu) A 3/4" COPPER WATER PIPE IN 1'COND
dj> ��'�
1SET 3- #1/0 THWN Cu �`����.••
( ) STUB-OUT
IN 2" C(UNDERGROUND) - ?:
Q.
•'•;�y
o.
EXISTING ELECTRICAL RISER DIAGRAM- TYPICAL SCHEMATIC CONNECTION DETAIL v
S.•
o. W►= o
W �.
N.T.S. Z : p
A. ALL POOL ELECTRICAL WORK SHALL COMPLY WITH NEC. i 3 Z •.
-�
O: 21 Z
w;
B. NO OVERHEAD ELECTRICAL WIRING SHALL BE LOCATED WITHIN 10' OF POOL'S Jr
'�,���,'
`4�
5 in
WATER EDGE UNLESS IT 18' OR HIGHER. -•
D��y�```
C. GROUND ALL BOXES, LIGTHS, MOTORS, LADDERS, ETC WITH #8 GROUND WIRE.
D. DECK AROUND POOL REQUIRE (4) EQUAL SIDES BONDED WITHIN 3' OF THE RIM.
E. ALL SWIMMING POOL PUMPS REQUIRE GFCI BREAKERS AS PER NEC 680.228
F. COMPLY WITH NEC 680.22
G. COMPLY WITH FBC E 403.9
PRESSURE GAUGE & CARTRIDGE FILTER
_ PRESSURE RELIEF VALVE ' 320 S.F.
MER
POOL PUMP
VARIABLE SPEED %�f��
3 HP, 230V �
W/ HAIR & LINT
STRAINER
/ 1
VENT PIPE MAX. LENGTH
FLOW
VENT
MAX
HP
RATE
SIZES
LENGTH
3
115 9Pm
11"
. _ -62LF
-VENT IS DESIGNED TO EVACUATE
SUCTION IN 3 SEC. OR LESS PER FBC424
-THIS SAFETY VACUUM RELIEF SYSTEM IS
A NON- MECHANICAL VENT SYSTEM THAT
WILL LIMIT THE TRANSMISSION OF
SUCTION AT THE OUTLET TO A MAXIMUM
OF 4.5" OF MERCURY.
rrrrllltt �
Z
C') 8
W Z5
r5.uu-
�
�Z
SW 61 AVE
SITE PLAN. scale 1 " =20'