CC 2016-11-22_09i Award Contract_ECR Storm Drain
MEMORANDUM
TO: CITY COUNCIL
FROM: GEOFF ENGLISH, PUBLIC WORKS DIRECTOR
BY: JILL MCPEEK, CAPITAL IMPROVEMENT PROJECT MANAGER
SUBJECT: CONSIDERATION OF AN AWARD OF CONTRACT TO INSITUFORM
TECHNOLOGIES, LLC FOR CONSTRUCTION OF THE EL CAMINO
REAL STORM DRAIN REHABILITATION PROJECT, PW 2016-12
DATE: NOVEMBER 22, 2016
RECOMMENDATION:
It is recommended the City Council:
1. Approve the construction specifications for the El Camino Real Storm Drain
Rehabilitation Project, PW 2016-12;
2. Find that the project is categorically exempt from CEQA pursuant to CEQA
Guidelines Section 15301(b);
3. Direct the City Clerk to file a Notice of Exemption;
4. Award a contract for the El Camino Real Storm Drain Rehabilitation Project to
Insituform Technologies, LLC in the amount of $57,750;
5. Authorize the Interim City Manager to approve change orders for 10% of the
contract amount, $5,775 for unanticipated costs during the construction phase of
the project (total construction costs = $57,750 + $5,775 = $63,525); and
6. Reallocate $88,900 from other projects in the Local Sales Tax Fund to cover the
subject project expenses.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Costs for the proposed project are approximately $88,900. Staff is recommending that
funds be reallocated from previously approved capital improvement projects that can be
delayed an additional year. The proposed project expenditures and funding sources are
listed in the chart below.
Item 9.i. - Page 1
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Item 9.i. - Page 2
CONSIDERATION OF AN AWARD OF CONTRACT TO INSITUFORM
TECHNOLOGIES, LLC FOR CONSTRUCTION OF THE EL CAMINO REAL STORM
DRAIN REHABILITATION PROJECT, PW 2016-12
NOVEMBER 22, 2016
PAGE 3
It was observed by staff that the void in the planter was caused by some type of failure
of the storm drain line that runs underneath the building from a junction box located
near the planter. To better assess the situation, staff enlisted one of the City’s on-call
material testing firms to perform a geotechnical observation. This observation was
performed on September 30, 2016, and a summary of the findings along with
recommendations was forwarded to the City on October 14, 2016 (Attachment 3).
In summary, the storm drain line that runs under the building is a corrugated metal pipe
(CMP) and it is severely deteriorated beginning at the junction box and extending to an
indeterminate distance in the pipe section under the building. It is likely causing erosion
of the surrounding soil. A self-propelled video camera unit was deployed into the outlet
side of the pipe to help determine the condition of the pipe. Staff was able to film at a
distance of approximately 190 feet into the pipe until the condition of the pipe no longer
permitted camera access. The total approximate length of the 24 inch CMP storm drain
is 350 feet.
ANALYSIS OF ISSUES:
Based on the available limited information, the public drainage system was connected
to a previously constructed private drainage pipe, which was completed prior to the
annexation of the subject property into the City. The drainage facility is not located in a
public drainage easement but does receive water from the public storm drain system
and run-off from the public storm drain system has contributed to the erosion. Based on
the Interim City Engineer’s determination, responsibility for the repairs lays with the City
because City stormwater is diverted into this private storm drain facility.
The public drainage system was connected to this private drainage structure before
incorporation of the subject property into the City boundaries. Current City Engineering
Standards would not allow for the construction of a building over a drainage facility.
This drainage facility will be recommended for abandonment and routed around the
building in a public drainage easement. This recommendation will be part of a future
drainage system master plan update.
In order to deter further erosion or widening of the void and to reduce the potential for
further erosion and decay of the corrugated metal pipe, staff prepared specifications for
the corrugated metal pipe (CMP) to be rehabilitated by use of a liner as it is impractical
to replace the CMP. The project was advertised for construction bids and on November
14, 2016, three bids were opened for the project. The lowest bid from Insituform
Technologies, LLC was in the amount of $57,750, The bid has been determined to be
responsive and Insituform Technologies, LLC to be a responsible bidder. The award of
a construction contract to Insituform Technologies, LLC is recommended.
Item 9.i. - Page 3
CONSIDERATION OF AN AWARD OF CONTRACT TO INSITUFORM
TECHNOLOGIES, LLC FOR CONSTRUCTION OF THE EL CAMINO REAL STORM
DRAIN REHABILITATION PROJECT, PW 2016-12
NOVEMBER 22, 2016
PAGE 4
The contract time is 45 working days. Work is expected to be accomplished during
December 2016 and January 2017.
ALTERNATIVES:
The following alternatives are provided for the Council’s consideration:
1. Approve recommendations as proposed;
2. Do not approve recommendations and request further information;
3. Modify recommendations and approve; or
4. Provide direction to staff.
ADVANTAGES:
Repair and lining of this corrugated metal drain pipe will reduce the potential for further
erosion and minimize potential damage to the building and building concrete slab above
the drainage pipe. Failure to address the repairs of this failed section of storm drain pipe
may result in damage to private property. Additionally, the condition of the existing
storm drain pipe currently allows for a semi-permanent lining repair. This pipeline repair
technique is routinely used to repair and line the City’s sanitary sewer system and has a
lifetime of approximately eighty (80) years.
DISADVANTAGES:
Funds used to make the recommended repairs will be diverted from other budgeted
projects. Also, the proposed repairs, although semi-permanent, will not prevent the
metal drain pipe from being recommended for abandonment in the future as the current
drainage facility is under-sized and routed under a building.
ENVIRONMENTAL REVIEW:
The project is categorically exempt from the California Environmental Quality Act
(CEQA) pursuant to Guidelines Section 15301(b) for the repair of existing utilities.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
Attachments:
1. Bid Opening Log Sheet
2. Notice of Exemption
3. Summary of Geotechnical Observations and Recommendations, Earth Systems
Pacific, October 14, 2016
Item 9.i. - Page 4
Attachhment Noo. 1
Item 9.i. - Page 5
Attachhment Noo. 2
Item 9.i. - Page 6
October 14, 2016
FILE NO: SL‐17914‐SA
Mr. J. J. Reichmuth
Michael K. Nunley & Associates
P.O. Box 1604
Arroyo Grande, CA 93421
PROJECT: CITY OF ARROYO GRANDE 2016‐002
EL CAMINO REAL STORM DRAIN – VOID BENEATH BUILDING
ARROYO GRANDE, CALIFORNIA
SUBJECT: Summary of Geotechnical Observations and Recommendations
Dear Mr. Reichmuth:
This letter has been prepared to document
our geotechnical observations and
recommendations regarding a void between
a storm drain line extending south from El
Camino Real and adjacent to a commercial
building located in Arroyo Grande,
California. We understand that the tenants
of the building noticed a hole in a planter
along the northern portion of the building,
adjacent to the entry door within the last
few months. Upon investigation by City
staff, it was determined that a storm drain
line runs from Highway 101 and El Camino
Real to a junction box adjacent to the
entrance. From the junction box, the storm
drain runs south under the building. It is
believed the storm drain line connects with
a storm drain inlet approximately 200 feet
south of the building. From there, the storm
drain runs southeast toward Brisco Road.
The hole in the planter, the building
entrance, and the junction box is shown in
the picture to the right.
We performed a site visit on September 30,
2016, and entered the junction box to
perform a visual assesment of the strom
Storm Drain Junction Box, Entrance, and Start of Void
ATTACHMENT 3
Item 9.i. - Page 7
City Of Arroyo Grande 2 October 14, 2016
2016‐002 El Camino Real Storm Drain
drain in this area. The
storm drain north of the
junction box is a concrete
pipe; south of the junction
box it is corugated metal.
The diameter of the pipe
extending south decreases
at this junction.
Visually, the concrete
portion of the storm drain
pipe north of the junction
box is in relatively good
conditon, as can be seen in
the picture the the right;
however, the corrugated metal pipe south of
the junction is severely deteriorated. The
invert of the pipe observed is nearly
completely missing for the first few feet and
has soil exposed. While the condition of the
entire length of the pipe was not assessed,
the invert of the portion of the pipe that is
visible from the junction box is corroded
and/or missing, although the corrosion
appears to decrease with distance from the
junction box.
We also looked into the void, which starts at
the hole in the planter. The void was
estimated to be 12 to 18 inches wide and
deep, and extend beneath the building
approximately 6 feet. We then poured water
into the void to observe where the water
would flow, and if it would drain to the pipe.
The water began flowing into the pipe
approximately 2 feet south of the junction
box from the east side of the pipe and then
also approximately 3 feet further south.
While the invert of the pipe is partially missing
between these two locations, water was not
observed flowing into this area. The
corrugated metal pipe and the first location
where water flowed into the pipe can be seen
in the picture to the right.
Concrete Strom Drain Section North of the Junction Box
Corrugated Metal Storm Drain South of the Junction Box
Item 9.i. - Page 8
City Of Arroyo Grande 3 October 14, 2016
2016‐002 El Camino Real Storm Drain
While it is unclear how the void was created, water flow through the corroded metal pipe has
eroded some of the soil below the pipe invert and likely some of the backfill on the east side of
the pipe as well. Irrigation from the planter area or surface water which found its way into the
planter may have found its way into this softer zone around the side of the pipe which then
flowed down the storm drain line. Once a flow path like this has been established, soil particles
are carried away with the water. The extent of which the void was created by the erosion around
the pipe from storm water flow or from surface flow cannot be determined; however, the flow
path should be eliminated to the extent practicable to reduce the potential for the void to
increase. Backfilling the void will also reduce the potential for undermining the support of the
adjacent building.
In order to both backfill the void and eliminate the existing flow path for surface water to find its
way into the storm drain pipe, we recommend filling the void with 2‐sack sand/cement slurry.
The slurry should be placed from the top of the void in the planter, be placed with a slump greater
than 5 inches, and be consolidated with concrete vibrator. It is common for sand/cement slurry
to have a very high water/cement ratio and the high water content can create a potential for
significant shrinkage of the slurry mass as the water flows out of the mix. The consolidation will
help to reduce this volume loss after placement. To further reduce this potential, the slurry mix
design should have a water/cement ratio should be less than 0.45; this may require inclusion of
a water reducing admixture in the mix.
It is anticipated that the some of the slurry will flow into the storm drain pipe; this is acceptable
and encouraged. The slurry that flows into the pipe should be finished from the junction box to
help recreate the invert of the pipe until it can be lined or replaced. The slurry should be placed
up to finish grade in the planter area to ensure the slurry has filled the entire void. The day
following the slurry placement, the upper 6 inches of the slurry in the planter can be removed
and replaced with topsoil or mulch as desired.
Once the void has been filled with the slurry, we anticipate the support for the structures
foundation should similar to what it was prior to creation of the void. We do not anticipate the
need for further underpinning of the structure. If in the future there is evidence of any
movement or a concern arises, helical piers could be installed and connected to the existing
foundation by means of a grade beam spanning between the helical piers. For preliminary
estimating purposes, the helical piers should be spaced no more than 8 feet on center. Based
upon our experience in the area, we anticipate the piers would be able to achieve a minimum
load of 40 kips of compression with an installation depth of 20 feet. This should be verified by
the contractor at the time of installation. Alternately, polymer injection grouting could be
performed with a minimally invasive process. The grouting program should be developed in
coordination with a specialty contractor. Cementitious grouting is not recommended due to the
higher pressures required and concern for the storm drain integrity.
Item 9.i. - Page 9
City Of Arroyo Grande
2OL6-OO2 ElCamino RealStorm Drain
October L4,2OL6
Our intent was to provide consultation in a manner consistent with the level of care and skill
ordinarily exercised by members of the profession currently practicing in the locality of this
project under similar conditions at this time. No representation, warranty, or guarantee is either
expressed or implied. We recommend that Earth Systems provide observation and testing
services during construction associated with mitigating the damage observed. lf Earth Systems
Pacific is not retained to provide construct¡on observation and testing services, it shall not be
responsible for the interpretation of the information by others or any consequences arising
therefrom.
We appreciate the opportunity to have provided professional services for this project and look
forward to working with you again in the future. lf there are any questions concerning this letter,
please do not hesitate to contact the undersigned.
Sincerely,
Earth ific
Robert Down, PE
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