ST8201-CS 881108 (2)DATE
ATTN:
PROJECT:
CONTRACTOR:
RE:
NOVEMBER
GINN, iNC., CON~ULliNb ENgINEErS
1710~ PRESTON
SUITE 1007
DALLAS, TEXAS 75248
~.~.OHNKARi:SRqJHERI~ P.'E. , RANDY FLEMING
DENTON TAP ROAD IMPROVEMENT FF(rJM B~L'I LiNE -I'0 SANDY LAKE
PROF'OSAL ({:)~127
L. H. LACY COMPANY
SUGGESTED FIELD CHANGE., ITEM 582.10., IRRIGATION CONNECTIONS
THE SIXTEEN (16) IRRIGATION CONNECTS SHOWN ON THE PLA~S ARE
MORE THAN REQUIRED TO DO THE JOB. I BELIEVE A 2" DIRECT TAP
IS AS BIO AS YOU CAN GO ON AN 8" WATER LINE. THIS BEING THE
CASE~ I SUGGEST THAT ONLY FOUR (4) EACH IRRIGATION CONNECTS
BE REQUIRED. THEY WOULD BE EVENLY SPACED AT APPRGXIMATELY
1400 FT. INTERVALS THE LENGTN OF THE JOB (STARTING ~
APPROXIMATELY A 700 FI'. DISTANCE FROM THE SOUTH END OF' THE
PRO~ECT). THIS ARRANGEMENT WOULD ALLOW TWO (2) OF THE
IRRIGATION CONNECTS TO ~UPPLY ONE ~I~ SPRIN:~LER SYSTEM TIME~
AND THE OTHER T~O (2) IRRIGATION CONNECTS WOULD SUPPLY ANOTHER
SPRINKLER SYSTEM TIMER. THIS WOULD KEEP THE MAXIMUM DISTANCE
TO T~E ~ARTHEST HEAD FROM A SUPPLY POINT AT 700 FEET~ WELL
~ITHIN REASON FOR THE DESIGN OF AN IR~GATION SYSTEM. THE
TIMERS COULD ~E PLACED AT AN AF'PROxiMA'I'~ ~ISSANCE Of 210O F~.
FROM E~THER END Of THE PROOECT~ TH1S WOULD KEEP THE M~XIMUM
IRRIGATION SYSTEM WI~ING DISTANCE TO THE FARTHEST SECTION
VALVE AT AN APPROXIMATE DISTANCE OF i~OOFT, THIS IS WELL
.WITHIN ANY DESIGN CRITERIA.
ADVANTAGES OF GOIN~ TO THE ABOVE ARE AS F8LLOWS:
TWELVE (12) EACH FEWER BACKFLOW PREVENTERS, AS REQUIRED
~Y LAea~ AS INSTALLED WITH SPRINKLER SYSTEM :~
52 TWELVE (12) EACH FEWER WATER METEF(S ]0 BE INSqALLED WIT'H
S~RINKLE~ SYSTEM ~ APPROXIMATELY $2000.OC~/EA.
4) TWELVE (12) EACH FEWER PLACES FOR ~ PO'I'ENTIAL LEAl( UNDEr.
PA~/I NG.
TH]S ~ROPEi~t-~L I~IE~IILI; REE~U)I,.~E ]HE t=EIL. L.OW)'N[~ WH!CH I~' ~'~ T~')c-OFF
W['I'I-t WI-IR] I~OULD BE REI..~UlREI~ BUF.:ING 'THE CONS"fRUETION OF "('HE
iRRIGATION SYSTEI~I:
TWO (2) EACH SLEEVES TO BRING EITHER POWER ]0 THE TIMERS
IF P'L/4CED iN ]'HE MEDIAN? OR ]HF_ SLEEVES WOULD 'BE REQUIRED
TO GET SECTION VALVF ~'.'If{INFJ TO THE MEDIAN IF THE TIMERS AF~E
PLACED BEHIND THE CURB ON THE OUTS1DE LANES. THESE [JAN
ON EITHER SIDE OF THE ROAD. PER CURRENT PLANCJ AND SPECS
THESE WOULD HAVE TO HAVE B[EN BOF{ED UNDEI~ THE ROAD iN
CONJUNCTION WITH THE IRRIGATION SYSTEM CO~JTF~ACT.
SIXTEEN i1~) EACH SLEEVES FROM MEDIAN ]'0 MEDIAN (APPROX.
1~00 LF)~ TO GET POWEE~ AND PIPING TO SECTIONS. THESE CAN
GO ON EITHER SIDE OF ]'HE ROAD. PER CURRENT PLANS AND SPECS
THESE ~OULD HAVE TO HAVE BEEN BORED UNDER ,THE ROAD IN
CONJUNCTION NITH THE IRRIGATION SYSTEM CONTRACT.
ATTACHED:
THE MINIMUM COST SAVINGS BY USING THIS PROPOSAL IS AS FOLLOWS:
(12~ EA CONNECTS ~ SbS~.oO/EA
SLEEVES ~ $ 5.50/LF
REDUCTION OF TWELVE
..BORING OF 1700L~ OF
TOTAL
$5950.00
$[~582.00
I SUBMIT THIS PROPOSAL AS LICENSED IRRICATOR 50~0 IN THE STATE
OF TEXAS.
DAVID M.. SNYDER~ P.E.
PRO~ECT MANASER
SCHEMATIC
FACTORS
~RRJ~ATION FACTORS
A QUICK 1AKE-GFF YIELDS THE FOLLOWING:
THE~E IS APPROXIMATELY 118,000 SOUARE FEEl' OF GRASS MEDIAN
THERE IS AF'PROXIMATELY 1~0 LF OF' TOTAL DISTANCE ~ETNEE~ MEDIAN NOSES
USED THE FOLLOWING FACTORS TO SIZE SYSTEM:
A 2" PVC IRR]GATION SYSTEM MAINLINE WILL SUPPLY APPROXIMATELY 55 - &O GPM
WITHOUT EXCEEDING A 5 TO 7 FOOT PER SECOND VELOCITY SI'ANDARD:
USED 4 GPM/FULL CIRCLE 15" E~ADIUS HEAD AS A DESIGN S]ANDAE~D
USED 50% 0~ THE RADIUS AS THE OVERLAP CRITERIA
USED 50 GPM/CIRCUIT AS A MAXIMUM CIRCUIT SIZE
USING THE ABOVE THE FOLLOWING INITIAL DESIGN INFORMATION WAS DERIVED:
118~000 SF TO BE WATERED/555 SF/~U~L CIRCLE HEAD = 554 FULL CIRCLE HEADS
5~4 FULL CIRCLE HEADS X ~ GPM/HEAD = 15~& GPM TOTAL SYSTEM
155~ GPM/50 GPM/C!RCUI'I = 27 C1RCOITS
ASSUME 2 EA 12 STATION TIMERS:
155~ GPM/24 STATIONS = 55 GPM/STATION
THE MOST ECONOMICAL IRRIGATION SET-UP WOULD BE TWO SEPERATE SYSTEMS TO WATER
ALL OF ]ME MEDIAN AREA. MAXIMt~M ~IPE SiZE 1~ SYSTEM WOULD BE 2". USE TWO
(2) EACH 2" IRRIGATION CONNECTS PER SYSTEM TO MINIMIZE H~AD LOSS. MINIMUM
OPERATING PRESSURE Al' FARTHEST HEAD 25 PSI.
GINN, INC.
December 22, 1988
CONSULTING ENGINEERS
Mr. David M. Snyder, P.E.
L. H. Lacy Company
10888 Shady Trail
P.O. Box 541297
Dallas, Texas 75354-1297
Re: Denton Tap Road Improvements from Belt Line Road to Sandy
Lake Road - Field Change No. 13
Dear Mr. Snyder:
Earlier today I hand delivered six sets of the revised Drawings
in the accompanying Drawing List reflecting the redesign of the
irrigation connections and the addition of irrigation sleeves for
future irrigation piping, power and control wiring between
medians and the outside back of curb at the locations indicated.
This work is to be accomplished in accordance with the existing
unit prices in the Contract with the exception of the 4" Schedule
40 PVC Conduit which will be installed as Pay Item 618.3 at the
unit price of $3.73 per lineal foot as proposed in your November
28, 1988 letter, copy attached. Please insert the revised
Drawings transmitted herewith in your construction sets and
remove their previous counterparts from the project site.
n se? f~J~~tabulation, this Field Change
estlma.ted~cr~as. ~e Estimated Contract Price by
Payment will~a~on the actual quantities of
~installed.
If you have any questions please call me.
Sincerely,
ohn C. Karlsruher, P.E.
attachments
cc ,'
Randy Fleming
j378 (j378fc11)
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
S~ee~
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DItAWXNG LXST
DE~ON TAP ROAD LMPROVE~ENT8
FROM BELT LXNE ROAD TO 8AHDY ~ ROAD
FIELD CHA~GE NO. 13
Sheet Index and Sllmmary Of
Quantities
Sta. 90+00 to 95+00
Sta. 95+00 to 100+00
Sta. 100+00 to 105+00
Sta. 105+00 to 110+00
Drainage
Drainage
Drainage
Drainage
Drainage Sta.
Drainage Sta.
Drainage Sta.
Drainage Sta.
Drainage Sta.
Drainage Sta.
Drainage Sta.
Drainage Sra.
Drainage sra.
Drainage Sta.
Drainage Sta.
110+00 to 113+50
113+50 to 118+00
120+00 to 125+00
125+00 to 130+34.29
130+34.29 to 136+00
136+00 to 140+00
140+00 to 145+00
145+00 to 150+00
150+00 to 155+71.31
155+71.31 to 160+00
160+00 to 162+02
Revision
No.
4
1
1
4
4
1
1
3
3
3
2
2
2
2
2
1
T~BUL~t.T'rON - FZELD CN,~I~GE NO. 13
XTF~ UNZT C~XNGE ZN CHANGE ZN
NO. DEBCP, ZPTZON PRZCE QU'A~TZTY COBT
582.10 Irrigation $636.00 (8) ea
connection
($5,088.00)
618.2 3# PVC conduit $ 3.00 89 if $ 267.00
(Sch. 40)
618.3 4"PVC conduit $ 3.73 1,457 if $5,434.61
(sch. 40)
TOTAL CHANGE IN ESTIMATED CONTRACT PRICE $ 636.61
D[:fllili',l iF~,P I~l;Jill) I"I(UM I.q:L I L ti',fl:! l,'lJ ~:~NI,)'/ LA'll::.£1,
l)l::l.ili, ll'.l, I~.~l:~ I(kl~:il/, I..I.((~P1 ~;~I'~U',' L_K~I<.~CL Iii l)l~:.'J~l,'Jf, ffd'"' .', ' '
UIJN Iltl41: I'0|1= L. H. L.AI2Y [:I'JIgPANY
'rHU Pt<LI2E '1'0 Uff;~ :;{" COf-'P[{I.'t }:tJl( THE I:l[.4t.]%'E r~£]:.El~fd:=rJC£:.l.) I1EHS
LJL;JNk; I'HE DE'fAIL ~,SHEEI' 9.~ (.iF lO:d, AND 5.6 III- 56 FOR THE'
I(ESPECI XVE ["t'(OJEI':'IS) L./-tLiEL[.:D iJ:(li(ll:J/~l'lON ~[::J:~gli.;E FOF{ MEDIANS,,
1) NO SCHEDULE qO PVC SLEEVE~ 2" COPPEF,.' 10 BE ~LII:(IED DIt'~ECI'.
PFd]JECT 2~, '? 8
I'IIEM 5~:2. 1¢) IF'3"{IliiA'I' 10N CONNEI'2'I
liE. lq '~ '"
.,B~.. 4 :tJ~lk]l::iA'l' ION CL)NN~:=C'I
'IHE F'RI:L.'E FI,,JR 4" f:'VrJ UI3NI,)iJ% I' FI)l< E~I I-HE~ P~gdECI'
General Contractors' /"'- '- ~d~-~_
214/357-0146
'Quality Conslructto~ Io~ over 65 Yeats'
t-'ROJEC l' HANAGER :.
10888 Shady Trail '.
P.O. Box 5412g?
Dallas, Texas 75354-1297
DATE:
TO:
ATTN:
PROJECT:
CONTRACTOR:
RE:
NOVEMBER
17103 PRESTON ROAD
SUITE 100~ L.B-.118
DALLAS~ TEXAS 7524B
~OHN'KARLSRUHE~? P.E., RANDY FLEMING
DENTON TAP ROAD IMP~OVEMEN'[ FROM 8~L]' LiNE ~'0 SANDY LAKE
PROPOSAL (0012)
L. H. LACY COMPANY
SUGGESTED FIELD CHANGE, ITEM 582. lO, IRRIGATION CONNECTIONS
THE SIXTEEN (l&> IRRIGATION CONNECTS SHOWN ON THE PLA~S ARE
MORE THAN ~EQUIRED TO DO THE JOB. I BELIEVE A 2" DIRECT TAP
IS AS BIG AS YOU CAN GO ON AN 8" WATER LINE. THIS BEING THE
CASE~ I SUGGEST THAT ONLY FOUR (4) EACH IRRIGATION CONNECTS
BE REQUIRED. THEY WOULD BE EVENLY SPACED AT APPrOXIMAtELY
1400 FT. INTERVALS THE LENGTH OF THE JOB (STARTING ~
APPROXIMATELY A 700 FT. DISTANCE FROM THE SOUTH END OF THE
PRG~ECT). THIS ARRANGEMENT WOULD ALLOW TWO ~2) OF THE
IRRIGATIO~ CONNECT~ ]'[! ~UPPLY O~E ~I~ SPrinKLER ~¥STEM T!MER~
AND THE OTHER T~O (2) IRRIGATION CONNECTS WOUCD SUPPLY ANOTHER
SPRINKLER SYSTEM TIMER. THIS WOULD KEEP THE MAXIMUM DISTANCE
TO T~E FARTHEST HEAD FROM A SUPPLY POINT AT 700 FEET, WELL
WITHIN REASON FOR ]'HE DESIGN OF AN IRRIGATION SYSTEM. THE
'TIMERS COULD BE PLACED AT AN APPROXIMATE DIS~ANCE OF 2100 F~.
FROM EITHER END 0~ THE PROJEC~ THIS WOULD KEEP THE M~XIMUM
IRRIGATION SYSTEM WI~ING DISTANCE TO THE FARTHEST SECTION
VALVE AT AN APPROXIMATE DISTANCE OF i~OOFT~ THIS iS WELL
.WSTHIN ANY DESIGN CRITEriA.
THE ADVANTAGES OF GOIN~ TO THE ADOVE ARE AS FOLLOWS:
1WELVE ~!2> E~lCH FEWER MAINLIN~ TAPS D 555~.00/EA
TWELVE (12) EACH F£WER BACKFLOW PREVENTERS., AS REQUIRED
BY LA~, AS I~STALCED ~ITH SPRINKLER SYSTEM 8
TWELVE (12) EACH FEWER WATER METERS ]'0 BE INSTALLED WIIH
SPR~NKL~ SY~T~ ~ APP~OX!MATE£Y $2000~00/EA.
.TWELVE (12) EACH FEWE~ PLACES FOR ~ POTENTIAL LEto( UNDER
PA~2ING.
~ , ,~Al~ .... F
'[HIS ~ROPOSAL ~OLJLI'~ RE[~I.!)~E' THE F'OL~L.EJW]N~ t,J.~.~[..H I~ A ~ ~ '
WiTH WHAT WOULD i.~E RE~!U1REI} DU~ING THE CONSIRUCT1ON OF THE
~R~ ~AT'I ON SYSTE~I:
l)
TWO (2) EACH SLEEVES TO BRING EITHER POWER TO THE TIMERS
Il= I~LACED 1N ]'HE MEDIAN, OR ]HE SLEEVES WOULD 'BE REQUIRED
TO GET SECTION VALVE V:IF~INO 'JO THE MEDIAN IF: TI.iL TIMERS
PLACED BEHIND THE ~URB ON THE OUTS1DE LANES. THESE CAN
ON EITHE~ SIDE OF THE F~OAD. PER CURRENT PLANS AND
THESE WOU~D HAVE TO HAVE B~EN BOF~ED UNDEf~ THE ROAD
CON~UN~TION WITH THE ISRIGATION SYSTEM CON~F~ACT.
SIXTEEN i16) EACH SLEEVES FROM MEDIAN 9'0 MEDIAN CAPPROX.
1600 LF'), TO GET POWE~ AND PIPING TO SECTIONS, THESE CAN
GO ON EITHEF( SIDE OF ]'HE ROAD. PER CURRENT PLANS AND SPECS
THESE WOULD HAVE TO HAVE BEEN BORED UNDER ~HE ROAD IN
CONOUNCTION WITH THE IRRIGATION SYSTEM CONTRACT.
ATTACHED:
THE MINIMUM COST SAVINGS BY USING THIS PROPOSAL IS AS FOLLOWS:
~EDUCT!ON OF TWELVE (12) EA CONNECTS ~ Sb56.00/EA
.BORING OF 1700L.~ OF SLEEVES
~ $ 5.50/LF'.. $5950.00
TOTAL
I SUBMIT TH.a rF~,~D~,~.~- AS ~_.C~.N~E,~ IRRIGATOD~ 50~,0 I[4 THE STATE
OF TEXAS.
DAVID M.. SNYDER~ P.E.
PRO~CT MANAGER
SCHEMATIC
FACTORS
A QUICK "TAKE--OFF YiE~-DS ]'HE FOLLOWING:
THEF~E IS APPF~OXIMATELY 118.000 SQUARE FEET OF SRASS MEDIAN
THO"RE Icj API'RO~,IMAT'PLY l~L~O LF OF TOTAL L'IS'IANCE BETk.~EE~.* ME!)iAF.~ NOSES
USED THE FOLLOWING ~ACTORS TO SIZE SYSTEM:
A 2" PVC IRRIGATION SYSTEM MAINLINE I~ILL SUPPLY APPROXIMA-fELY 55 - ~0 GPM
WITHOUT EXCEEDING A 5 TO 7 FOOT PER SECOND VELOCITY S"TANDAF','D:
USED 4 GPM/FULL CIRCLE I5' RADIUS HEAD AS A DESIGN S]ANDAF~D
USED 50% I]~ THE RADIUS AS THE OVERLAP CRITERIA
USED 50 GPM/CIRCUIT AS A MAXIMUM CIRCUIT SIZE
USING THE ABOVE THE FOLLOWING INITIAL DESIGN INFORMATION WAS DERIVED:
118,000 SF TO BE WATERED/555 SF/FULL CIRCLE HEAD = 554 ~ULL CIRCLE ~]EADS
5~4 FULL CIRCLE HEADS X 4 GPM/HEAD
155& GPM/50 GPM/CIROUI]
ASSUME 2 EA 12 S~ATI~N TIMERS:
155~ GPM/24 STATIONS
= 1556 GPM TOTAL SYSTEM
= 27 C1RCL~ITS
= 55 GPM/STATION
THE MOST ECONOMICAL IRRIGATION SEI-UP WOULD BE TWO SEPERATE SYSTEMS TO WATER
~LL OF 1HE MEDIAN A~EA. MAXIM~ ~iPE SiZE 1N S¥STE~iWOULD BE 2~'. USE TWO
(2) EACH 2" IRRIGATION CONNECTS PER SYSTEM TO MINIMIZE H~AD LOSS. MINIMUM
OPERATING PRESSURE AT FARTHEST HEAD 25 PSI.