SS9301-CS 920428 <..,. :)St~ GRAPEVINE CREEK SEWER TRUNK M~IN BRANCH I
.,~ .~, -~ "' .,,/' ~..,.,,3 .~'~'~-~.c.,oz._x.,,,.~,~..,__ PROS AND CONS OF VARIOUS OPTIONS
'.:.'~'.~ -~ C
A. Project as originally designed in the bottom of Grapevine Creek
between Denton Tap and the east side of the Creekview subdivision
with no bottom stabilization and no erosion control as per the Halff
study.
'... ? 0~_ Pros
..?..,:i3~.., .~,,,-,,'" C..'
,-/.a..b~l) Lower initial construction cost.
._ r -../ 2) Project already designed.
:.- . . ~..~ ~ 3) The shallow depth of the sewer line creates an easier
\. :3,~ construction process, if the weather is not bad.
Cons
_ 1 ) Property owners are unwilling to dedicate easements.
_. -.~"~~~ Therefore, anticipate 100% condemnation of 58 lots.
2) Construction could accelerate the erosion process.
3) The actual construction and access to and from the creek is
dependent upon weather conditions.
4) The sewer line must be fully concrete encased.
5) Contractor would have to remove excavated material to keep it
from causing a drainage problem in the creek.
6) By disturbing the creek, the City would be incurring an
indefinite maintenance liability.
B. Project as originally designed in the bottom of Grapevine Creek
between Denton Tap and the east side of the Creekview subdivision
with bottom stabilization and no erosion control as per the Halff
study.
Pros
1) The project is currently designed, with the exception of the
channel bottom protection.
2) The shallow depth of the sewer line creates an easier
construction process, if the weather is not bad.
Cons
1) Property owners are unwilling to dedicate easements.
Therefore, anticipate 100% condemnation of 58 lots.
2) Construction could accelerate the erosion process.
3) The actual construction and access to and from the creek is
dependent upon weather conditions.
4) The sewer line must be fully concrete encased.
5) Contractor would have to remove excavated material to keep it
from causing a drainage problem in the creek.
GRAPEVINE CREEK SEWER TRUNK MAIN BRANCH I
PROS AND CONS OF VARIOUS OPTIONS (CONT'D)
April 27, 1992
Page 2
6) By disturbing the creek, the City would be incurring an
indefinite maintenance liability.
7) The design of the channel bottom protection would have to be
completed.
8) Higher construction cost.
C. The third option would be alternate route down east Bethel with open
cut and micro tunnelling.
Pros
1) No easements would need to be acquired from the property owners
in the Creekview and Meadowcreek subdivisions. The line would
go in the right-of-way of east Bethel Road.
2) By not disturbing the creek, the City would not be accelerating
the erosion process.
3) By not disturbing the creek, the City would incur no
maintenance responsibilities in Grapevine Creek.
4) By not disturbing the creek, the erosion protection, as
presented in the Halff Study, could be implemented based on the
current priority listing.
Cons
1) There is a higher construction cost due to removing and
replacing the street and micro tunneling in areas where we
cannot open cut.
2) Access to the property in the Creekview subdivision would be
difficult, but not impossible, during construction.
GRAPELST
CITY OF GOPPEIL '.~ ~'~-T~uI O O ~ w- ' 24-Apr-92
(DST OOMPARISON - GRAPEVINE CP,~EK SEWER TRUNK MAIN - BRANCH I
ORIGIN~Ju ESTIMATE - NO~IM HIGH BANK - MORE SH/~_iOW LINE
OPTION A - PRCkJtL~ AS DESIGN~) - CREAM BOYI{~ RObTE - (NO BOTR~ STABILIZATION - NO ~OSION CONTROL}
100% OONDEMNATION ON ~ AO~JI$ITION - 58/1 = 58 TOTAL
50% OONDEMNATION ON EAS~fl~P A(JQUISITION - 58/2 = 29 TOTAL
OPTION C - ALTERNATE ROUTE - E. BETHEL ROAD - (N. lANE OF STRUT) - OPEN/OJT TUNNEL
ORIGINAL OPTION OPTION OPTION
DESCRIFI~ON ESTIMATE A B C
OPINION OF PROBABLE ESTIMATED (XINSTRUCTION (DSTS
TRA MANHOLE/~IRD $460,000.00 $460,000.00 $460,000.00
~XOCKINGBIRD/FAST BANK 702,000.00 702,000.00 702,000.00
FAST BANK TO DENION TAP 612,000.00 612,000.00 1,356,000.00
EOFIE~ STABILIZATION O. 00 600,000.00 0.00
SUBTOTAL ESTIMATED (DNSTRUCTION COSTS $1,250,000.00 $1,774,000.00 $2,374,000.00 $2,518,000.00
DESIGN PHASE S~VICES
SURVEYING $43,500.00 $46,500.00 $51,000.00 $51,000.00
G353IEEMNI~ 20,000.00 14,600.00 16,600.00 16,200.00
ENGINEERING DESIGN 78,625.00 105,600.00 137,200.00 143,400. O0
SUFIUFAL DESIGN PHASE $~VICES $142,125.00 $166,700.00 $204,800.00 $210,600.00
CONSTRUCTION ADMINISTRATION $13,875.00 $18,600.00 $24,200.00 $25,300.00
INSP~ETION 37,500.00 53,200.00 71,200.00 (75,500.00}
TESTI]~ 15,300.00 21,700.00 29,000.00 39,000.00
SUBqOTAL CONSTRUCTION PHASE $66,675.00 $93,500.00 $124,400.00 $139,800.00
IOTAL - DESIGN AND CONSTRUCTION $1,458,800.00 $2,034,200.00 $2,703,200.00 $2,868,400.00
~CIES (10% OFTIONS A-C) $259,200.00 $203,420.00 $270,320.00 $286,840.00
TOTAL CENSTRUCTION (X]grS $1,718,000.00 $2,237,620.00 $2,973,520.00 $3,155,240.00
POSSIBLE OTHER ODSTS ASS(XXATED WITH THE PRO3ECF
~/RIGHT-OF-WAY $32,000.00
NH]OTIATOR' S FEE $87,000.00 $43,500.00 $1,500.00
AT1DRNEY' S F~E 145,000.00 72,500.00 2,500.00
(IIgH$$ION~' $ CDURT 87,000.00 43,500.00 1,500.00
AWARDS/DAMAG]~ 290,000.00 145,000.00 5,000.00
~ 8/9, NLWE 12 20,000.00 20,000.00 20,000.00
SUBql)TAL ASSOCIATED CI3STS $32,000.00 $629,000.00 $324,500.00 $30,500.00
TOTAL PRO3ECT (DSTS $1,750,000.00 $2,866,620.00 $3,298,020.00 $3,185,740.00
(lA? OVI~,/(UND~]{) ORIGINAL F,.cI'IMATE 1,115,620.00 1,548,020.00 1,435,740.00
GRAPEVINE CREEK SEWER TRUNK M~%IN
ASSUMPTIONS MADE IN COST ESTIMATES
OriGinal Estimate
1) The sanitary sewer would be placed on the north side of
Grapevine Creek in or near the existing easement.
2) Any easements needed would be dedicated to the City.
3) The EnGineerinG Design fee would be 7.5% of the construction
cost. (This fee is based on a sliding curve based on the
construction cost).
4) The inspection cost would be 3% of the construction cost.
Option A
1) The EnGineerin~ Design fee would be 7% of the construction cost.
2) The Inspection cost would be 3% of the construction cost.
3) There would be 100% condemnation of the lots in the Creekview
and Meadowcreek subdivisions (58 total).
4) The negotiator/appraisal fee would be $1,500 per condemnation.
5) The attorney's fee would be $2,500 per condemnation.
6) The commissioner's court cost would be $1,500 per condemnation.
7) The Awards/DamaGes would be $5,000 per condemnation.
Option B
1) The En~ineerin~ Design fee would be 6.8% of the construction
cost.
2) The inspection cost would be 3% of the construction cost.
3) There would be 50% condemnation of the lots in the Creekview
and Meadowcreek subdivision (29 total).
4) The negotiator/appraisal fee would be $1,500 per condemnation.
5) The attorney's fee would be $2,500 per condemnation.
6) The commissioner's court cost would be $1,500 per condemnation.
7) The Awards/Damages would be $5,000 per condemnation.
8) The bottom stabilization would be a solid gabion mat from toe
to toe of the creek.
Option C
1) The Engineering Design fee would be 6.7% of the construction
cost.
2) The inspection cost would be 3% of the construction cost.
3) About 2,330 foot of Bethel could be open cut and the last 1,255
foot would be micro tunneled.
4) An additional box culvert would be added across Bethel Road to
compensate for lost of capacity when the sewer line goes
through the existing box culvert.
GRAPASSU
CITY OF COPPELL 24-Apr-92
COST COMPARISON - GRAPEVINE CREEK SEWER TRUNK MAIN - BRANCH I
ORIGINAL ESTIMATE - NORTH HIGH BANK - MORE SHALLOW LINE
OPTION A - PROJECT AS DESIGNED - CREEK BOTTOM ROUTE - (NO BOTTOM STABILIZATION - NO EROSION CONTROL
100% CONDEMNATION ON EASEMENT ACQUISITION - 58/1 = 58 TOTAL
OPTION B - CREEK BOTTOM ROUTE WiTH BOTTOM STABLIZATION AND NO EROSION CONTROL
50% CONDEMNATION ON EASEMENT ACQUISITION - 58/2 = 29 TOTAL
OPTION C - ALTERNATE ROUTE - E. BETHEL ROAD - (N. LANE OF STREET) - OPEN/CUT TUNNEL
ORIGINAL OPTION % INCREASE
DESCRIPTION ESTIMATE A (DECREASE)
OPINION OF PROBABLE ESTIMATED CONSTRUCTION COSTS
TRA MANHOLE/MOCKINGBIRD $460,000.00
~OCKINGBIRD/EAST BANK 702,000.00
EAST BANK TO DENTON TAP 612,000.00
BOTTOM STABILIZATION 0.00
SUBTOTAL ESTIMATED CONSTRUCTION COSTS $1,250,000.00 $1,774,000.00 41.92%
DESIGN PHASE SERVICES
SURVEYING $43,500.00 $46,500.00
GEOTECHNICAL 20,000.00 14,600.00
ENGINEERING DESIGN 78,625.00 105,600.00
SUBTOTAL DESIGN PHASE SERVICES $142,125.00 S166,700.00 17.29%
CONSTRUCTION PHASE
CONSTRUCTION ADMINISTRATION $13,875.00 $18,600.00
INSPECTION 37,500.00 53,200.00
TESTING 15,300.00 21,700.00
SUBTOTAL CONSTRUCTION PHASE $66,675.00 $93,500.00 40.23%
q'OTAL - DESIGN AND CONSTRUCTION $1,458,800.00 $2,034,200.00 39.44%
CONTINGENCIES (10% OPTIONS A-C) $259,200.00 $203,420.00 -21.52%
TOTAL CONSTRUCTION COSTS 81,718,000.00 $2,237,620.00 30.25%
POSSIBLE OTHER COSTS ASSOCIATED WITH THE PROJECT
EASEMENT/RIGHT-OF-WAY $32,000.00
NEGOTIATOR'S FEE $87,000.00
ATTORNEY'S FEE 145,000.00
COMMISSIONER'S COURT 87,000.00
AWARDS/DAMAGES 290,000.00
LOTS 8/9, NLWE 12 20,000.00
SUBTOTAL ASSOCIATED COSTS $32,000.00 $629,000.00 1865.63~
TOTAL PROJECT COSTS $1,750,O00.00 $2,866,620.00 63.81~
COST OVER/(UNDER) ORIGINAL ESTIMATE 1,116,620.00
CITY OF COPPELL 24-Apr-92
COST COMPARISON - GRAPEVINE CREEK SEWER TRUNK MAIN - BRANCH I
ORIGINAL ESTIMATE - NORTH IIIGH BANK - MORE SHALLOW SINE
OPTION A - PROJECT AS DESIGNED - CREEK BOTTOM ROUTE - (NO BOTTOM STABILIZATION - NO EROSION CONTROLi
100% CONDEMNATION ON EASEMENT ACQUISITION - 58/1 = 58 TOTAL
OPTION B - CREEK BOTTOM ROUTE WITI{ BOTTOM STABLIZATION AND NO EROSION CONTROL
50% CONDEMNATION ON EASEMENT ACQUISITION - 58/2 = 29 TOTAL
OPTION C - ALTERNATE ROUTE - E. BETHEL ROAD - (N. LANE OF STREET) - OPEN/CUT TUNNEL
ORIGINAL OPTION % INCREASE
DESCRIPTION ESTIMATE B (DECREASE)
OPINION OF PROBABLE ESTIMATED CONSTRUCTION COSTS
TRA MANHOLE/MOCKINGBIRD $460,000.00
MOCKINGBIRD/EAST BANK 702,000.00
EAST BANK TO DENTON TAP 612,000.00
BOTTOM STABILIZATION 600,000.00
SUBTOTAL ESTIMATED CONSTRUCTION COSTS $1,250,000.00 $2,374,000.00 89.92%
DESIGN PHASE SERVICES
SURVEYING $43,500.00 $51,000.00
GEOTECHNICAL 20,000.00 16,600.00
ENGINEERING DESIGN 78,625.00 137,200.00
SUBTOTAL DESIGN PHASE SERVICES $142,125.00 $204,800.00 44.10%
CONSTRUCTION PHASE
CONSTRUCTION ADMINISTRATION $13,875.00 $24,200.00
INSPECTION 37,500.00 71,200.00
TESTING 15,300.00 29,000.00
SUBTOTAL CONSTRUCTION PHASE $66~675.00 $124,400.00 86.58%
TOTAL - DESIGN AND CONSTRUCTION $1,458,800.00 $2,703,200.00 85.30%
CONTINGENCIES (10% OPTIONS A-C) $259,200.00 $270,320.00 4.29%
TOTAL CONSTRUCTION COSTS $1,718,000.00 $2,973,520.00 73.08%
POSSIBLE OTHER COSTS ASSOCIATED WITH THE PROJECT
EASEMENT/RIGHT-OF-WAY $32,000.00
NEGOTIATOR'S FEE $43,500.00
ATTORNEY'S FEE 72,500.00
COMMISSIONER'S COURT 43,500.00
AWARDS/DAMAGES 145,000.00
LOTS 8/9, NLWE 12 20,000.00
SUBTOTAL ASSOCIATED COSTS $32,000.00 $324,500.00 914.06%
TOTAL PROJECT COSTS $1,750,000.00 $3,298,020.00 88.46%
COST OVER/(UNDER) ORIGINAL ESTIMATE 1,548,020.00
CITY OF COPPELL 24-Apr-92
COST COMPARISON - GRAPEVINE CREEK SEWER TRUNK MAIN - BRANCH I
ORIGINAL ESTIMATE - NORT}! HIGH BANK - MORE SHALLOW LINE
OPTION A - PROJECT AS DESIGNED - CREEK BOTTOM ROUTE - (NO BOTTOM STABILIZATION - NO EROSION CONTROL)
100% CONDEMNATION ON EASEMENT ACQUISITION - 58/1 = 58 TOTAL
OPTION B - CREEK BOTTOM ROUTE WITH BOTTOM STABLIZATION AND NO EROSION CONTROL
50% CONDEMNATION ON EASEMENT ACQUISITION - 58/2 = 29 TOTAL
OPTION C - ALTERNATE ROUTE - E. BETHEL ROAD - (N. LANE OF STREET) - OPEN/CUT TUNNEL
ORIGINAL OPTION % INCREASE
DESCRIPTION ESTIMATE C (DECREASE)
OPINION OF PROBABLE ESTIMATED CONSTRUCTION COSTS
TRA MANHOLE/MOCKINGBIRD $460,000.00
MOCKINGBIRD/EAST BANK 702,000.00
EAST BANK TO DENTON TAP 1,356,000.00
BOTTOM STABILIZATION 0.00
SUBTOTAL ESTIMATED CONSTRUCTION COSTS $1,250,000.00 $2,518,000.00/ 101.44%
DESIGN PHASE SERVICES
SURVEYING $43,500.00 $51,000~00j
GEOTECHNICAL 20,000.00 16,200.00/
ENGINEERING DESIGN 78,625.00 143,400.00~"
SUBTOTAL DESIGN PHASE SERVICES $142,125.00 $210,600.00 48.18%
CONSTRUCTION PHASE
CONSTRUCTION ADMINISTRATION $13,875.00 $25,300.00-"
INSPECTION 37,500.00 75,500.00~--~'~
TESTING 15,300.00 39,000.00
SUBTOTAL CONSTRUCTION PHASE $66,675.00 $i3F, 800.00 109.67%
TOTAL - DESIGN AND CONSTRUCTION $1,458,800.00 $2,868,400.00 96.63%
CONTINGENCIES (10% OPTIONS A-C) $259,200.00 $286,840.00~ 10.66%
TOTAL CONSTRUCTION COSTS $1,718,000.00 $3,155,240.00 83.66%
POSSIBLE OTHER COSTS ASSOCIATED WITH THE PROJECT
EASEMENT/RIGHT-OF-WAY $32,000.00
NEGOTIATOR'S FEE $1,500.00
ATTORNEY'S FEE 2,500.00
COMMISSIONER'S COURT 1,500.00
AWARDS/DAMAGES 5,000.00
LOTS 8/9, NLWE 12 20,000.00
SUBTOTAL ASSOCIATED COSTS $32,000.00 $30,500.00 -4.69%
TOTAL PROJECT COSTS $1,750,000.00 $3,185,740.00 82.04%
COST OVER/(UNDER) ORIGINAL ESTIMATE 1,435,740.00