HomeMy WebLinkAbout1986-08-26; City Council; 8438-2; Slope Stabilization Change Order - StagecoachCIT ? OF CARLSBAD - AGEND P BILL .c-
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AB# ~3g-2 I TITLE: SLOPE STABILIZATION CHANGE ORDER - IDEPT. HD
MTG.8/26/86
DEPT. P & R
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RECOMMENDED ACTION:
Approve slope stabilization work to be done by Chamac Inc. and
appropriate funds from the Capital Improvement Project budget to cover the cost of the additional required work. RESQLH~~O~ AJO* . ~~~~~~
ITEM EXPLANATION:
On March 11, 1986, a meeting was called by the Anden Group with City staff. The Anden Group is developing Santa Fe Knolls, a
housing project across Mision Estancia from Stagecoach Park.
Also present was RSI, Rick Engineering, Geocon (soils engineers for Stagecoach Park), Eberhart & Stone (soils engineers for
Anden) and representatives from the Olivenhain Municipal Water
District. The soils engineer for the developer explained that grading operations at Santa Fe Knolls uncovered a "landslide"
that was not found during initial geological studies. The Anden
Group data indicated that the slide started in the housing
development and extended under Mision Estancia and into the park.
To correct the problem, they felt a large buttress constructed on
the park slope adjacent to Mision Estancia was needed.
Staff directed Geocon, who did the original geotechnical work on
the park, to investigate the alleged "slide". Originally Geocon
did not do test borings in the north east corner of the park
pads. Geocon took several borings in the area of the alleged
slide. Their report findings indicated no presence of a slide.
At this point, staff commissioned the soil engineering firm of
Woodward Clyde to study the area and give an independent opinion.
This was done because Eberhart & Stone still felt strongly that
a landslide was present even after Geocon's report. Secondly,
Olivenhain Municipal Water District agreed with Eberhart & Stone'
opinion and subsequently shut off water in the area (feeling
Mision Estancia and the waterline under the road were in danger.)
Woodward Clyde drilled additional test borings. Their report confirmed Geocon's finding that no landslide existed. They did,
however, identify an area in which the soils lying under Mision Estancia and.-in the slope of the park were of a Del Mar formation
with fractures, sheers and remolded clay.
because they concentrated on the various fill areas and building
-
With the presence of this type of soil condition, coupled with
future landscaped watering to the south there is a strong possi-
bility of a slope stability problem on the park side that could
cause damage to the street and a 16 inch water line.
Woodward Clyde's recommendation was to have a slope analysis done Staff then directed Geocon to perform the analysis. Geocon's final report stated the following:
Agenda Bill No. Page 2 w= 0
I' . . . Although, in our opinion, the potential for shallow
potential for sloughing failure or small block failure of
the cut slope. A failure could extend into the northern
portions of Mision Estancia, but the potential for extend- ing to the east bound lanes is considered very low.
To reduce the potential for shallow slope instability,
it is recommended that a "Stability Fill" be constructed . .
(See Exhibit 2)
slope instability is considered to be low, there is a
Alternatives
1. Do nothing; repair if necessary in the future.
2. Reconstruct slope per soils engineer recommendations.
Discussion
Staff and park development committee have reviewed all the data
and various alternative solutions pertaining to the slide/slope
stability issue.
It has been determined that becaus.e the developer to the south
east has constructed a large deep buttress adjacent to Mision
Estancia, any possible slide problem has been resolved. However,
because our soils engineers have identified a soil condition
that could be aggravated by future landscape watering and/or
high water tables, staff feels that 700 feet of slope adjacent
to the park should be stabilized, as recommended by the City's
soil engineering consultant.
The reason staff feels this work should be done is:
1. Slope stabilization would eliminate ongoing slope sloughing
and repair.
2. Slope stabilization would eliminate possible damage to
Mision Estancia and the 16 inch water line under the road.
3. The Olivenhain Municipal Water District has endorsed the
staff's stabilization plan and has agreed to re-activate their wate line if the work is done.
4. Re-activating the water service would alleviate possible
litigation by Olivenhain Municipal Water District and/or upstream developments.
'Agenda Bill No. &
Page 3
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Additionally, staff believes it would be beneficial for the park development contractor, Chamac, Inc., to perform this
work through a change order to the original contract rather
than go out for public b'id. The benefits are as follows:
1) Public bidding would require a lengthy and costly
advertising and bidding process.
2) Having another contractor on site could present
problems in coordination between contractors and
create additional cost and time extension claims
against the City.
3) Chamac has dealt fairly and in good faith with the
City on minor change orders and the grading sub-
contractor appears to be highly qualified.
It is estimated that construction on the slope will delay the
completion of the park by 30 to 60 days.
Fiscal Impact
COST OF PROJECT $341,000
(see detailed estimate attached, Exhibit 3)
Staff recommends funds be allocated from unappropriated balance
of the Public Facilities Fee fund (P.F.F.). Revenues in the Public Facilities Fund for 1985-86 were approximately $1.6 million
above budget estimates. This additional revenue provides Council
with an unappropriated balance of at least $1.6 million for the
beginning of 1986-87.
Exhibits
1. Resolution No. 8776
2. Exhibit 1, Plan showing area of unstable slope.
3. Exhibit 2, Section of slope stablization detail.
4. Exhibit 3, Cost estimate.
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RESOLUTION NO. 8776
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF CARLSBAD,
CALIFORNIA, APPROVING SLOPE STABILIZATION WORK TO BE DONE
BY CHAMAC, INC. AND APPROVING THE APPROPRIATION OF FUNDS
FROM THE CAPITAL IMPROVEMENT PROJECT BUDGET TO COVER THE
COST OF THE ADDITIONAL REQUIRED WORK
WHEREAS, a "stability fill" has been recommended t
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for a portion of Stagecoach Park; and 7
constructed to reduce the potential for shallow slope instabi
8! WHEREAS, slope stabilization would eliminate'ongoin
9 slope sloughing and repair; and
10 WHEREAS, slope stabilization would eliminate possib
11
endorsed staff Is stabilization plan as protection for their w 14
WHEREAS, the Olivenhain Municipal Water District ha 13
and 12
damage to Mision Estancia and a 16 inch water line under the
15 line and has agreed to reactivate their water line if stabili
16 work is performed; and
17 WHEREAS, reactivating the water service would allev
18
I/ upstream developments requiring water service; and 19
1 possible litigation by Olivenhain Municipal Water District an i
20 WHEREAS, Chamac, Inc. is the Contractor responsible
21
stabilization work; and 23
has been recommended by staff to perform the required slope 22
the construction and development of Stagecoach Community Park
24 I WHEREAS, sufficient funds are available in the un-
25
cost of this project, 26
appropriated balance of the Public Facilties Fund to support
27 , ///
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NOW, THEREFORE, BE IT RESOLVED that the City Counci
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Fund, account No. 320-941, to account no. 320-840-1824-3191, 5
$329,000 from the unappropriated balance of the Public Facili 4
to be performed by Chamac, Inc. and approve the appropriati 3
the City of Carlsbad does hereby approve the slope stabilizat:
cover the cost of the additional required work at Stagecoach 6
7 PASSED, APPROVED AND ADOPTED at a regular meeting c
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day of August 1986, by the following vote, to wit: 9
City Council of the City of Carlsbad, California, held'on the
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. NOES : None 11
AYES: Council Members Casler, Lewis, Kulchin, Chick and Pel
12 +-fL a4 b 13
ABSENT : None
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ABSY" - ""-
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15 ll ATTEST:
16 1 &&C&A d. a&
I? I ALETHA L. RAUTENKRANZ, City Clerk
18 // (SEAL)
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STAGECOACH COMMUNITY PARK
SLOPE STABILIZATION COST ESTIMATE
1. SUBCONTRACTOR
Grading
Staking
Block
OH&P @ 10% first $2,000 - 5% remaining
Subcontractor Total
2. GENERAL CONTRACTOR
General Conditions:
60 Days @ $400 per day
Block Wall Footing
OH&P, 15%
General Contractor Total
= $205,000 - 2,200
- 650
$207,850
= 10,292
-
-
= $218 , 142
= $ 24,000
1,112
$ 25,112 - 3,766
= $ 28,878
-
Subcontractor (Grading) Total = $218 , 142
General Contractor (General Conditions) Total = 28,878
1% Bond
$247 , 020 - 2,470 -
Total = $249 , 490
3. GENERAL CONTRACTOR: Additional Parking Lot
Redesign due to slope elongation as per RSI Design
Concrete Work (Stairs, Curb,
Masonry
Iron
Drainage Work
Brow Ditch (D75) , Mow Strip
Supervision
15% Contingency
TOTAL :
Block Wall) = $ 1,632
- 658
- 95
= 10,640 - 4,000
- 2,000
-
-
-
-
$ 19,025
2,853
$ 21,878
Subcontractor, General Contractor = $249 , 490 General Contractor Redesigned Parking Lot = 21,878
Subtotal = $271,368
EXHIBIT -3
e e
4. Engineering Service/RSI Plan Revision = $ 9,000
5. Soils Engineering & Inspection - 10% = $ 28,036
6. City Engineering Services - 5% = $ 15,420
7. Printing
8. Contingency - 5%
- - 500
$3241324
= 16,216
$340,540
GRAND TOTAL Rounded Up = $341,000
Qlivenftain Municipal Wate 7 District
BOARD OF DiRECTORS
Ann L. Peay. F'resi&mt
i-lowar? G. Golem. VICE President
kfariec L. Denk. Treasurer
Horold L. Gono. Secretory
Ti~elrrra M. Miiior. Director
lcj(>h OI.I','L'.;.NHAIN F<(?,41)
E\CihiTA5 C:?LIFOR?IIA 02024
PHOSE !I\~O\ 753-h300
September 2, 1986
GENERAL COUNSE
L'ernon A. Pe!tzer
ENGINEER
9ovie Englneerrng C,
MANAGER
Wiliram H Holiingsu
Mark Steyaert, Project Manager
City of Carlsbad Park and Recreation Dept.
1200 Elm Avenue
Carlsbad, California 92008
RE: Stagecoach Park Landslide
Dear Mr. Steyaert:
The undersigned is in receipt of your letter of August 28, 1986 requesting
certain information regarding a realignment of the District's 16'' water line in
Mision Estancia Road.
The District would entertain an alternate alignment through the Anden
property within the projects public streets. Realignment within Stagecoach
Park is not acceptable. The District has been advised by its geotechnical
consultants that the landslide may encroach a considerable distance into the
park on the southwest side of Mision Estancia.
Relocating the pipeline adjacent to Mision Estancia Road along the
southeast side is also an unacceptable alternative. The Anden Project has
constructed a 20 to 25' embankment at the edge of the Mision Estancia right-of-
way. It would be necessary to bench into the embankment to construct a
pipeline at this location. Any alignment within the existing Mision Estancia
right-of-way is considered to be in the landslide zone.
Attached is a District estimate of the cost to relocate the pipeline
within the Anden public streets. This estimate is supplied for planning
purposes only and may not include all of the costs of relocation. It should be
noted that there is no planned service from the existing Mision Estancia
pipeline through the landslide zone, however, there are two existing fire
hydrants within this area. Removal and realignment of the water line will
eliminate these two fire hydrants from a 700' stretch of Mision Estancia. It
is suggessted that the Parks Department may wish to consult with the City of
Carlsbad Fire Department regarding the lack of fire protection within this
section of Mision Estancia.
The District is prepared to cooperate with the City of Carlsbad wherever
possible. Olivenhain wishes to reiterate that the perferred solution is still
for the City to construct a buttress as recommended by three geotechnical
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consultants. The buttress solution protects all of the utilities within Mision
Estancia Road as well as the Misian Estancia right of way.
DCM: j sb
9-2-86
encl .
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., . . ..__” d (P~~y”‘ ’
Assistant Manager
Olivenhain Water District
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Portion to be realigned.
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STORM DRd/N
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mrE: JCT. 22, I 739 ROC. # 30 - 35D52 .'
SiORN DRA/N '€As=#€.7
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0. 0 GEOCON
INCORPORATED
Geotechnical Engineers and
Engineering Geologists
File No. D-3480-MO3
September 3, 1986
City of Carlsbad
Parks and Recreation Department
1200 Elm Avenue
Carlsbad, California 92008
Attention: Mr. Mark Steyaert
Subject: STAGECOACH PARK
CARLSBAD, CALIFORNIA
CONSULTATION
Gentlemen:
The purpose of this letter is to restate recommendations made in our
report of 3une 20, 1986 relative to placing a stability fill along Mision
Estancia and to correct statements made during a recent council meeting
pertaining to the calculated existing factor-of-safety.
In our report of May 27, 1986 a factor-of-safety against sliding of 1.39
was calculated for the cut slope based on data obtained from exploratory
borings placed by Geocon, Incorporated and Woodward-Clyde Consultants.
Sometime later, a buttress keyway was placed along the east side of Mision
Estancia. Subsequent examination of the excavation by our engineering
geologist provided new data which prompted a revision of the recommended
stability fill width as presented in our letter of June 20, 1986.
Utilizing this same data the factor-of-safety against sliding was
recalculated to be approximately 1.2. Because of this relatively low
factor-of-safety, it remains our opinion that the slope be stabilized as
recommended in the June 20 report.
?lease contact the undersigned if you have any further questions.
Very truly yours, k )\$ OCON, INCORPORATED
i
Michael W. Hart
CEG 706
MwH:wm
(4) addressee
0533 Dowzv Dm7
San Dtec?. CA 32:E 619 695-2899
0, CITY OF CARLSBAD e
PUBLIC WORKS PROJECT CHANGE ORDER
[More than $51QQQ]
320-820-1
CONTRACT NO. 3191 & 3197 PURCHASE ORDER NO. 15697 BUDGET NO
CONTRACTOR'S NAME Chamac
PROJECT NAME AND NO. Stagecoach Community Park
DIRECTOR OF PARKS & RECREATION CHANGE ORDER NO. 4
The contractor is directed to make the following changes. Changes shl include labor, material, and equipment; payment stated on this change includes all charges direct or indirect arising out of this additions,
work. -The requirements of the specifications, where pertinent and no. conflict with this order shall apply to these changes.
CHANGE 2
Slope stabilization work (see attached).
REASON FOR CHANGE:
Unstable soil condition on slope.
COST :
Total extra to contractor $
Total credit to the City $ -0- total net extra to contractor $ Not to Exceed $262,877
APPROVED BY CITY COUNCIL ON:
APPROVAL : CONTRACTOR:
Not to Exceed $262,877
-/ _-
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BY
@/& ,/-+;;-/PGeFF~< "2/
Project Mang(Eier I/ / Date
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&d L AeDA
P&'rk@- RecreatiAn Director Date :'
This change order is not effective unless signed by the Director of P and Recreation.
1 I- .@
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RSl
Architecture. Landscape Architecture, Recreation and Environmental Planning
August 19, 19RG
Chamac, Inc.
'747 Enterprise Street
Escondido, California 92025
SUBJECT: CHANGE ORDER #4, STAGECOACH PAEIK, CARLSBAD
You are hereby requested to comply with the following changes from the plans and specifications:
ITEM $1
Install stabilization fill at the southeast end of the park according to Rick Engimeeriny Drawing SE-3, revised 8/6/86 arid Gcocon report dated June 20, 1386. Hauling of all fill material shall be between the hours of 8:OO a.%. and 3:30
p.m. Contractor shall shorc! up the existivrJ el.ect.:ci.cal vault.s. Variable costs are indicated due to the s.1ork:ing conditions required by the unstab1.e geologic f ornation.
All work performed in 50 foot secticms within 55 chys, add
$ 198,966.00. A1.I. work performed in 100 foot sections within 50 ciays, add .B 189,315.00. AI.]. work performed in 1-50 foot sections within 45 dr?:Ts, add,
$ 189,315.00 .
Two 50' exploratory sections opened up within 40 days, and
approva.1 given by GeGcOn to do a11 'the work at one time, add
General Condition costs are $4OO,OO per day.
All work shall be .reviewed, tested, and approved by Geocon.
Constri.lction Alternate ''A" . 1nstal.l retaining ws.I.l-, acilditional curbs, inow strip, catch b2sirfs, brow ditch, crib
wa:Ll ar.d stairs accordinq to RsI Dr3whg ''st-shility Fill
Revisions" dated 7/29/85, revisd 8/7/86; mil RSI I)x'~~wing
"lrrigation Plan - East Sta'iii.1.Ft.y Fi3.L Fevizio::" dated
21/8/86 as attached. Add 4; 38,358.00.
Construction A:Lt.ernate rrBrr. Inst-IIL retainj ny wa:L1,
additional curbs, mow strip, hrw ditch, crib ~32.1, gutter, arft stairs zccoxling to ?.SI Dr;wir~g l'~b.abiliby FiI-I. RevisiCns" drrtctl 7/29/86, revised 3/7/86 and 3/1.5/86, and
RSS 13rawir.g "1rri.gatiorr Plan - East Sta5iIity Fi 11 Re?isi<>i1''
dat.ed. 8/8/86 a; at.t:a.chcd. P.d.1 $ 26,122.00 .
""
$ 175,953.00 .
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2500 East Nutwood Avenue, Suite 210 Fullenon. California 92631 (713) 879-6373
'I -
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Total maximum Q ;.est.. ............................. * $ 237,324.00:i Total minimum cost.. ............................. $ 202,075.00''
Cost shall be determined by actual grading conditions in
field and items constructed.
Specifications, where pertinent and not in conflict with the
above, shall apply to these changes.
The contract time is hereby extended 40-55 calendar days to
complete the above described work.
This document shall become an amendment to the contract and
all provisions of the contract shall apply thereto.
PREPARED BY: ATE& s 20, IPSG
RECREATION S
ACCEPTED B DATE 8-20-86
Chamac Inc. A California Corpdation
CONTRACTOR
APPROVED BY DATE
AGENCY REPR
:':Does not include General Conditions.
Minimum . $18,584.00 Maximum $25,553.00 I" 1
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