882-Art Lane CO 2-Landfill Clos SECTION 00950
CONTRACT CltANGE ORDEd~I ~ 20 P:'I 2:56
Change Order No.: 2
Bid Number: IFB 00/01-19
Project Title: Art Lane Class III Landfill Closure
Contractor: ERC General Contracting Services, Inc.
Reason for Change: Bid Item Overruns; Additional Scope of Work
Breakdown of Proposed Changes and Basis for Payment
(Includes pertinent drawings, specifications, and documentation where necessary)
Item No. and Description Change in Contract +(-)
Item # 16 - Haul City Supplied Sand $13,620.00
Add-on Item - Top Soil $ 24,965.00
(purchased, loaded, & hauled by Contractor)
(1) Total Proposed Change in Contract Cost +(-) $ 38,585.00
(2) Original Contract Price $ 390,771.62
(3) Total All Previous Change Orders $ 123,761.40
(Change Order No. 1 through )
(4) New Contract Price (Total of Item I through Item 3) $ 553,118.02
(5) Original Contract Time 150 Days
(6) Additional Days Approved -0- Days
(Change Order No, __ through )
(7) Current Contract Time 150 Days
(8) Additional Days Proposed -0- Days
(9) New Contract Time (Total of Items 7 and 8) 150 Days
(10) New Construction Completion Date October 2, 2001
February l, 2001 00950-1 99533.01
Rec~mmended by Engineer: ~ ~)~,~a,~,~ Date:
Accepted by Owner: /;~ Date:
~e~
Accepted by Contractor: [ ~ Date:
END OF SECTION
February l, 2001 00950-2 99533.01
WCG, Inc.
Professional E~ngineers
. 630 N_ Wyrnote Road. Suite 370
!., M~tfancl, Florida 32751
I . . -. (407)647-6623 f~: (407)S39-0575
!. ( . . www.wcg~ .corn
Maltland * Palm Beach Gardens * Tampa, * DeLand
~June 27, 2001
Mx. Charles
Project Coordinator - Roads Department
800 W. Fnlton Street
Sanford, Florida 32771
-' Subject: Ertgineers Revised Estimate of Drainage Sand and Soil Quanlities
the Art Lane Landfill Closure Including Wet Detention Pond
Dear Mr. Rarerove:
WCG, Inc has reviewed the amount Of drainage sand used 0~ite to date and compared it
tO the quaatities that would need to I~ pI~iced for the 5.9 acre closure. Note that the
etOiure area has ~ased about four percent due to increased height of the landfiR due to
~, the pla~enr of the soil / inert material law the landfill inroad of on top of it. This
letter compares the amount of soil and sand placed on the landfill, to the calculated
; ,---, engineering quantifies for a 5.9 acre closure.
~' ': Sand Q~m~ilies Used for (ias Layer under the OCL
~ estimated sand requirement in place was 9400 CY above and below the Oeosynthetic
Clay Layer (GCL) for a 5.7 acre closure This quantity is 9730 CY for a 5.9 acre closure.
Using a conservative swell / loss factor of 1.40, this equates to approYimately 13600 CY
of truck volume per layer of sand.
To date, ERC General Contracting Services has used 14200 CY for the sa~d layer _below
below the GCL. Twelve thousand CY of the lower sand layer (under the OCL) was
obtained from the Contractor' s borrow pit during the first ten days of the project.
The remaining 2200 CY has been hauled from the City's Geneva road sand piI. Ix is not
unusual to lose soil or sand on the layer over the waste. Loading at the Geneva pit was
observed by City personnel, and Rip tickets were issued for each u'uck leaving the site.
_This quantity of send is reasonable for the layer over waste.
Sand Quantifies Used for the Drainage Layer Above the GC~,
Placement of the drainage layer over the C-CL was completed on June 20, 2001. This was
the final day of GCL deploymere. Truck Rip records indicate that 14690 CY were hauled
forthe layer above the GCL. In addition to covering the GCL, th~ sand was extended 4
feet past the G-CL cap end tapered to provide a transitlob to empty the sand drainage layer
.... above the GCL. The fi.nl mack volume ofdrn;,,,,ge sand placed above the GCL is 14,690
Mr. Charles Hargrove
June 27, 2001
Page 2
CY. WCG estimates that the extension of the sand layer added 400 CY to the project,
making the ea/culatod quantity 14,000 CY for this layer. The 14600 CY placed is very
high for the 5.9 acre closure, equating to a swell factor /Ioss factor of 1.49. Sand was
loaded loosely in the u-ucks, but the trucks appeared to be full, equal to the top of the
steel bed_ The in-place depth of sand was twelve inches, prior to consolidation by the
rainfall eve2ats. in place density of sands was 95 to 98% of standard proctor, although 90
percent was required by the sp~ci~catio;s.
Total sand for the project (12,000 CY plus 17,000 CY) is much higher than pred~.'.ctod,
even us'rag a 1.4 ratio for u'uck volume to in-place volume, The Firs~ Chan~e Order
alloeated monies to increase City su '~'~ sand To ~ 000 CY. Thus the quantity used
h~ exceeded the quantity astima ' 1 by 3000 CY- Incrementa/
cost for drainage sand above ~~
Topsoil Requirements for the Landfill Cap Area
Based on the amount of in-piace sand below and over the GCL, WCG esrinaates that
15,000 CY (~tleic measure) of topsoil will be needed to complae the footprint of the
landfill. The 5.9 acre cap ar~a has a slope factor of 1.04 (ratio of slope area to fiat area)
and a swell factor of 1.40.
Topsoil Requirements for the Wet Detention Pond
Topsoil i$ also neede~ for the sodded portion of the wet detention pond which includes
the b~n~en ~om elevation 51 +/- to elevation 46.0: ERC O~aeral Contracting S~wi~s Ii'~.
is requesting an additional 1500 CY tO be able to place g inches 0ftops0il on the sodded
areas within the pond. Suitable s0il$ in the pond above elevation 46.0 were assumed in
the bid but were either co/~tam~n~ced with waste or were too clayey to sustain a healthy
stand of grass. This import~ topsoil for the land~/l cap and the stormwater pond is an
added quantity. that was not included in the bid.
The pond area to be covered is approximately ~0,000 SF of which about 40,000 SF was
previously covered with soils from the pond or purchased topsoil_ Approximately 40,000
sauare feet needs to be dressed with topsoil to support the sod. The required topsoil ~s
caIculaZed as 40,000 SF times 0.67 foot depth times a 1.4 swell factor or 37,500 CF. Th~s
equates to 1390 CY of topsoil needed to complet~ the pond. Not~ that the l~ond was o~.'er
exe. avazed by six to eight inches in oraer to place topsoil, even though this was not shown
or anticipated in th~ bid plans.
Mx'. Charles Hergrove
June :37, 2001
Paff~ 3
WCG agrees that the pond must be dr~ssod for the placement of sod, but the quantity
could be reduced from 8-inch thickness to 6-inch thickness, reducing the pond soils
purchase quantity to approximately 1050 CY.
Iota/Topsoil Requiremere
A total of 16400 CY Truck measure, should be used as the engineers estimate of final
quantity for topsoil needed to complete the project. This prop/des 1400 CY of topsoil for
the pond. ERC predicts that 17000 CY (truck volume) will be needed for the landfill and
completion of the pond.
As of.rune 26tb (end of day) ERC General Contracting Services Inc. has hau~dd 1 ~ 736
CY of tOpsoil from the Seminole County stockpile and approximately 3450 CY from the
city's 26 street pit lOcatiOn. Thu~, according (o ERC, Inc., up t0 an additional ~700 CY
is needed for completion of the projccL About 300 CY is needed to finish the landfill and
1400 CY is needexi for the pond. Ibis topsoil must be purchased from a nearby source.
The Engineer's quantity (16400 CY) and the Contractor's overall quantity for topsoil
(17,000CY) are within 600 CY. The qtlantities are greater than bid due to high swell
factors, a slightly larger area to be covered and the need to use lopsoil for the pond area.
On June 26, 2001, ERC proposed the purchase of topsoil from Woodbridge Fh,,lers, the
campany that is contracled to Sewinole Courtly to remove the same stockpile that the
City has been using under the Seminole County agreement The proposed cost iS $1.25 /
CY loa~Ied plus $3.63 to hau/to ~xe Art Lane Landfill. IncrCmenta/cost for rhi~ 1700 CY
transaction iS eStlma~:ed to be $7808.00 at $4.88 / CY, even though it is loaded at the
source by Woodbridge Haulers. For 1700 Cy, the difference between the prior agreed
price ($3.63 / CY) and the current price ($4.88 / CY) is 12142.00. ERC, Inc has
indicated that 1700 CY is an upper limit quantity for completion of the landfill and the
pond. The final additional quantity of topsoil estimated by ERC as of/une 27, 2001 is
1300 CY. The incremr, mal cost for 1300 CY is $1625.00. WCG recommends that the
purchase of up to 1700 CY be authorized by the City so that the project can conlinue to
completion,
The Incremental quantity of topsoil above Change Order No. I is 6828 CY. The
incrementa/cost above change order No. 1 is estimated to be 5130 CY X $3.63 ,-
$18,62t .00 plus..1.7-0O'CY X $4.88/CY~396:00 or $24 965.00.
Mr. Charles Haxgrove
June 27, 2001
Page 4
If you have any questions or requite additional assistance, please contact me at your
convenience at (407) 647-6623
Yours truly,
WCG, Inc.
j~Less~7, p.E.~
Attachments
c: Whir Herrington
Sum Keely
File 11305,01
)CITY OF SANFORD AGENDA MEMORANDUM ] DATE July 9, 2001
ITEM NO.
SUBJECT: Cb~n~e Order #2 - Art l,~ne CI9~ 1211/.~ndfill Clostwe Construction
DEPARTMENT: Public Works DIVISION: Admini~xaxion
AUTHORIZED BY: Robert G. Herman CONTACT: Charles Flau~rove EXT: _5681
MOTION/RECOMMENDATION:
Recommend Commission approve: 1 ) Cban~e Order #2 with ERC G-encral Comncting Scrvic~s~
Inc. in the amount of $2.4,965.00 and adjusunem of quantities in the amount- of $13,620,00
totaHn5 38,585,00 - increasing the cozaract price ~-om $515,857.82 to $554,442.82, ~r~t 2)
budget transfer in th~ amount of $38~585,00 ~,om General Fund Reserves to Act No. 001:4002-
534-34,22 (An Lane Landffil Closure).
BACKGROUND:
Atlal~hed is Challge Older #~ for ~ ~ !.,qne C~ ~ Lsnd~] C]o~ p~ It ~-~s of
~ k~ ~ to ~[~e ~ proj~ - to~ $24,~5.00,
A) 5130 cu~c y=~ oftop~fl
~ of $18,621,~,
B) t3~ ~c ~ds of~p~ at ~.88/CY
~ ~ of $6,3~.~.
P~ ~: U~r ~ od~
~ d~ ~on of~ ~. ~ s~ work ~o~e~ ~ ~ ~ov~ ~ on
~, WCO ~. (~ ~ by ~ C~ to ~on ~ ~c. ~ W
coyote ~ pw~).
~ ~j~cnt h q~ ~ch ~e,
A) I~ ~16 - ~ C~ S~pH~
~ ~ ~e ~tor) for a ~ ~ of $13,620.00
C~ g~e ~ ~ ~ pwject e~rs
~d for ~ ~ work ~ ~j~
ofEn~ ~on ~EP)
wm ~ve ~n w~ew~ a~ se dee~d r~o~le Br ~ work hvol~&
C~
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