ST8201-CS 881116 iNC.' -
GINN,
November 16, 1988
Mr. David M. Snyder, P.E.
L. H. Lacy Co.
CONSULTING ENGINEERS
P.O. BOX 541297 ~
~4~?~provements from Belt Line oad~
Lake Road, Coppell,-Texas.
D~er:
This letter~ r,
r is an z=~monuc t_ z-ur lctte~ oI October z8,
November 7, 8, and 11, copies of which are attached. Since all
of these letters deal with items related to the construction of
the subject project I felt it expedient to deal with them
together.
In regards to your October 28, 1988 letter concerning
installation of an additional 8" water valve in the existing
water line just south of Braewood; it is my understanding from
conversations with you and Randy Fleming that this will allow you
to isolate the water line to perform the necessary lowerings to
avoid conflicts with Storm Sewer line "B" without interrupting
service to McDonalds and other businesses. Under the
circumstances we will allow you to include this item under Field
Change No. 5.
We will allow you to reduce the number of supports for the
Sanitary Sewer Aerial Crossing extension at Grapevine Creek as
Field Change No. 6. We agree with your supporting documentation
of November 7, 1988 that the costs of additional utility work you
have had to perform more than offset the cost savings associated
with reducing the total number of piers for the crossing from 6
to 4. Therefore, in light of the foregoing and the fact that the
revised structure will be more resistant to trash accumulations
during flooding, we feel that a reduction in the price for this
item is not warranted.
We are consulting with our Landscape Architect regarding your
proposal of November 8, 1988 to revise the layout of the median
irrigation connections. If the Landscape Architect is in
agreement with your proposal, we will be happy to issue a Notice
of Field Change to cover the reduced scope of work.
17103 Proton Road · Suilc 100 · I,IIII8 · l)allas, Tcxas 75248 · Phone 214/2484900
In response to your November 8, 1988 letter asking for
clarification of the details and drawings depicting the
Irrigation Connections which are currently a part of this
project, we offer the following:
1. The Irrigation Connections shown on the Drainage Plan
and Profile sheets are labeled incorrectly.
2. The details shown on sheet 96 of 102 differ somewhat in
minor ways, but both clearly show that 2" type K copper
pipe must be used with a schedule 40 PVC sleeve. The
methods of connection to existing water mains are also
clearly shown.
3. In order to avoid further confusion, the detail labeled
,'PVC SLEEVE FOR MEDIAN IRRIGATION" shall be used for the
Irrigation Connections on this project.
Your letter of November 11, 1988, concerning the Storm Sewer
Lateral for the Storm Sewer Inlet at Station 90+00 is not very
explicit with regard to the situation you would like us to
address. Therefore I have been in contact with our Resident
Project Representative, Mr. Randy Fleming. In my conversation
with Mr. Fleming he informed me that you are proposing to avoid a
standard water line lowering, for which there are provisions in
the Contract. Mr. Fleming has explained that under the scenario
you meant to propose in your letter, that a revision of the Storm
Sewer Lateral grades to match the existing 24" pipe, and avoid
the conflict with the 8" water line, would leave only 3"
clearance from the bottom of the 24" Storm Sewer Lateral to the
top of the 8" water line. Based on the information I have
received regarding this issue, I suggest you proceed at once in
accordance with the provisions contained in the Contract and
lower the existing 8" water line to resolve the conflict with the
Storm Sewer Lateral.
We appreciate your cooperation and will be happy to answer any
further questions you may have.
Sincerely,
John C. Karlsruher, P.E.
Project Engineer
enclosures
cc:
Russell R. Doyle, P.E.
H. Wayne ~inn, P.E.
Randy Fleming
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17103 PRESTON IqOAD
~IJi-t-E 100, L[~--i 1~ ~
J)ALt..~ ~ TEXAS 7~24~
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, ,[2t-J t]t'iA~',ILi)E ~,,:':'t:"
L.. H. LACY I:~E6)LJES'T'S THAT CILIR SLJB-C(JNT'RACT'OR BE AI_LO~Ji~D TI]
iNSTALL AN 8" VALVE ON THE 8" LINE JUST' ..SOUTH Ctr i~RAiiWOOD.
-rilES IS T0 ACCOMt]DA'FE THE ~A'TER LINE LOWERINGS I'14f4'(' HAVE
'1"O E~E DONE ON THE LINE B SFORM DRAINAGE LATERALS.
:.3" WATER VALVE L EA ,~775.~)~) F'Ef< EA
f'tti5 k.]ALME ri] DE LOCATED ;g I::'L.:4L;E DEYE,":~I~IlNED
AI'.II) I'HE £)I',INEF( ' S I:kEI::'F<L~L;EN-I'AT I ',2E,
fkl~41,1tq-'FOU FOR Yt]IJR CONolDEf,,AF[Oxl
RESPEC]'F ULt.',' ·
L. H. Lacy Company
General Contractors
214/357-01.46
10888 Shady Trail
P.O. Box 541297
Dallas. Texas 75354- t 297
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CONTRACTOR:
RE:
NOVEMBER ~ .... ~,~
.:4iNN, lng., CONSOL'i'ir~[- ENuiNLL[(L;
i7i07 PRESTOI'~ ROA"Z'
SUII'E. iuu. LB--Ii8
DALLAS ~ TEXAS 75248
JOHN KARLSRUHER, P.E., RANDY PLEMING
DEN]ON TAP ROAD IMPROVEMENT FROM BEL.'I LINE ID SANDY LAKE
F:'ROF'OSAL
LACY COMPANY
REQUEST FOR CLARiPICATION~ ITEM 582.10, IRRIGATION CONNECTS
THE L. H. LACY COMPANY FEELS ]HE PLANS & DETAILS ARE AMBIGUOUS
IN RESPECT TO THE ABOVE REFERRENCED ITEM. THE DRAINAGE PLAN ~
PROFILE SHEETS INDICATE THAT THE IRRIGATION CONNECTS ARE ]0 BE
2" PVC SUPPLY LINES IN 4" PVC SLEEVES. THERE ARE TWO DETA1LS
ON SHEET 96 0~ 102 THAT DIPFER GREASILY 1N ]'HEIR REQUIREMEN'~S
BE]'WEE~ EACH OTHER, AS WELL.. AS IN SPECIFYING COPPER INSTEAD OF
F'VC AS CALLED FOR ON THE DRAINAGE PLAN ~ F'ROF1L. ES.
I"HANK-YOU.
Ag~F'EC'I'FULLY,
DAVID M. SNYDER, F'.~.
PROJECT MANAGER
BY
L.. I't,. L~4[;Y COMPANY
JOHN ~RLS~tJHERe
DEN'ION TAP ~uA~
P.E. ~
I HPHOVEMEN T t': ~{OM
L. H, LA{:;¥ COMPANY
AI'I'ACHED ['i1'41) HOf{IZONTAL AND VEFtI'IEAL TIE5 ~0~ THE 2~" t~F.
L H. Lacy Company
General Contractors
214/357-0146
-Qualily Construction fo~ ~ 65 Yearn'
10888 Shady Trail
P.O. Box 541297
Dallas, Texas 75354-1297
I Ii
'
ATTN:
F'RUJEC]:
CONTRACTOR:
RE:
5ir4iN, l~C., CL"Nt~UL]iNb ENuINEEHb
!7107 PRESTON ROAD
SUITE IL)~). L.B- lID
DALLAS~ TEXAS 7524.~
JOHN KARLSRUHER. P.E., RANDY FLEMING
DEN"f'OINI TA~F' R(]I-:~L) IMF'ROVEMEN] FROM B .... LINE IU SANDY LAKE
t::'I-(OF'OSAL (L)L) 122
L. H. LACY COMPANY
SU6GESTED FIELD CHANGE? ITEM 582. 10, IRRIGATION CONNECTIONS
THE SIXTEEN (16) IRRIGATION CONNECTS SHOWN ON T'HE PLANS ARE
MORE THAN REQUIRED TO DO THE JOB. I BELIEVE A 2" DIRECT TAP
~ 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. ]HEY WOULD BE EVENLY SPACED AT APPROXIMA]EL¥
1404) FT. ~NT:RvML~ THE uENo
AF.'PROXIMAI'ELY A 700 FT. DIS'lANCE FROM )HE SOUTH END [)P THE
PROJECT). THIS ARRANGEMENT WOULD ALLOW TWO ~2) OF "FHE
.... ONN .... WOULD SUF'F'LY ANOTHER
"""'"'""= OTHER TWO ,o~ .RF,~,~ .....
SPRINKLER SYSTEM TIMER. THiS WOULD KEEP THE MAXIMUM DISTANCE
TO THE FARTHEST HEAl) FROM A SUPPLY POINT A~ 700 FEET, WELL
WITHIN REASON FOR THE D~l~N OF AN iRRiGATiON ~Y~,E.,. lHE
'I'iNERS COULD BE PLACED AT
FROM EZTHEF.'._F:ND OF ]I4E ,-~:"["¢*"~*~'-~,~:~, ]H1S WOULD KEEP THE MP, X1MUM
.RF,.GAT.O4 _,.,,~b WIRING DISTANCE TO ~E FARTHEST SECTION
VALVE A) AN APPROXIMATE DIp]ANCE OF 1/~.~orl~ THIS IS WELL
WITHIN PFIY D_...I,.N CRiTERiA.
"FHE A:)VANTAGES OF: GOING TO THE ABOVE ARE A'-] FOLLOWS:
2)
lb ..... .b ' ' '''
,..~) EACH FEWER DACK. FLOW PREVENTERS. AS REQUIRED
~.Y L,,:~, C-IS .,N~'.q-~l~- ~.~-,-~" ' ~"' WI-I"H SPRINKLER SYSTEM ~$~,,jl.'"=. (.)(:),'ER
5)
TWELVE (i2~ EACH F'EWER WATER METERS 'lO BE iNSiALLED WITH
SP?INKLE-P :./:TE:, 8 AF'F'RDX!MATE~Y $2000,
TWELVE (12) EACH FEWER PLACES FOR A F.'O]EN'IIAL LEmI::: UNDER
W] IH WHAT WOULI~ UE REL.!UiREI~ DURING THE CONSIF(UCT10N OF ]HE
TWO (2) EACH SLEEVES "[O BRING EITHER POWER TO THE TIMERS
iV: ,~'LA~ED iN 1HE MEDIAN? OR IHE SLEEVES WOULD I~E REQUIRED
IC: GEl SECTION VALVE ~';iRiNu :o ItlE HEDIAN IF THE ]IMERS ARE
PLACED BEHINI) THE CURB ON THE OUTSIDE LANES. THESE CAN
ON EITHER SIDE OF THE ROAD. PER CURRENT PLANS AND
THESE WOULD HAVE ]O HAVE BEEN BORED UND~ lHE ROAD
CONJUNCTION WITH THE IRRIGATION SYSTEM CONTRACT.
SIXTEEN (16) EACH SLEEVES F-ROM MEDIAN l'O MEDIAN (APPROX.
1~OO LF), TO GET POWEi<, AND PIPING TO SECTIONS. THESE CAN
GO ON EITHER SiDE OF ]HE ROAD. PER CURRENT PLANS AND SPECS
THESE WOULD HAVE '¥O HAVE BEEN BORED UNDER THE ROAD IN
CONJUNCIlON WITH THE IRRIGATION SYSTEM CONTRACT.
ATTACHED:
MINIMUM COSI' SAVINGS BY USING THIS PROPOSAL IS '~ FOLLOWS:
SCHEMAT 1C
EA CONNECTS :D ~o..:.~. O0/EA $/~.=,.~. OJ
~£, $ 5.'... 50t LF $5950.00
.,n~,,.~..,-*~O.,.~.,., , .- ii~ Tile S';'ATE
DAVID H. SNYDER, P.E.
FR~J-C, ,,A,,AGER
A ~,!LJiCt:, ]AI:.:E-OF:'F 'FZE,-i;~ THE FOLLOWING:
THERE iS AF'PF~OXIMA]'ELY 118.000 SQUARE FEE] OF GRASS MEDIAN
USED THE FOLgOWIN~ F~C]'ORS TO SIZE SYSTEM:
A 2" F'VC IRRIGATION SYSTEM MAINLINE WILL SUPPLY APPROXIMATELY
...... . .... E.L[[., , S]ANDARD:
WITHOLIT :XCu:DING A 5 TO 7 FOOT F'ER ~ECOND '
USeD 4 BF.'M/FULL CIRCLE 15:* RADIUS HEAD AS A DES1GI'..I
~0,. OF THE RADIUS AS 7HE OVERLAP ~RITERi~
USED =
USED 50 GPM/CIRCUIT AS A MAXIMUM CIRCUIT SIZE
USING THE ABOVE THE!FOLLOWING INITIAL DESIGN INFORMATION WAS DERIVED:
1~8,01)0 SD TO BE WATERED/353 SF/FULL CIRCLE HEAD = 354 FULL CIRBLE H~ADS
334 FULL CIf.(CLE HEADS X ~i GPM/HEAD
!..3.]~6 GPI~/50 G~::'t~i/C !R'~d I]
-P, SSUME 2 E[A 12 S~A]ION
13:],~ GF'~/24 S]ATIONS
= 1.J..:.o GPM TOTAl- SYSTEM
'IHF_ MOS~, Eg]ONOMiSAL iRRi[~AFION SE]--UF'
(2) EACH 2" IRRIGATION CONNECTS PER SYSTEM TO MINIMIZE HEAD LOSS.
OPERATING PRESSUF{E A] FARTHEST HEAD 25 PSi.
= 55 GF'M/S]'ATIOI'4
:~EF.~A : SYSTEPiS TO WATER
WOULD BE TWO ~' '~:"*' ~-
SiZE ii~ .......... WOULD ~ . u~ TWO
MINIMUM