INQUIRIES & RESPONSES
|ROUTE / KP
San Diego County At Various Locations.
Microwave Vehicle Detection Systems.
|HMS CONSTRUCTION INC.
|MANUEL BROS. INC.
|GOLDEN STATE UTILITY CO.
The Caltrans District
Office is located at 2829 Juan Street, San Diego, CA 92110. The mailing
address is P.O. Box 85406, San Diego, CA 92186-5406. The District 11
Senior telephone number is (619) 688-6635. Please submit all inquiries
in the proper format by fax to (619) 688-6988 or e-mail to:
The responses to
bidder' inquiries, unless incorporated into a formal addenda to the
are not a part of the contract and are provided for the bidder's
only. In some instances, the question and answer may represent a
of the matters discussed rather than a word-for-word recitation. The
may be considered along with all other information furnished to
bidders for the purpose of bidding on the project. The availability or
use of information provided in the responses to bidder' inquiries is
to be construed in any way as a waiver of the provisions of Section
of the Standard Specifications or any other provision of the contract,
the plans, Standard Specifications or Special Provisions, nor to excuse
the contractor from full compliance with those contract requirements.
are cautioned that subsequent responses or contract addenda may affect
or vary a response previously given.
Caltrans District 11 Construction
has developed this method of answering Bidder's Inquiries to better
the needs of the Contractors who bid on our Projects. Caltrans District
11 Construction Department will post all of the questions submitted by
any of the contractors that are registered Planholders for that
but reserves the right to not answer any questions deemed
for public viewing.
& RESPONSES will be updated continuously and all attempts will be
to do the final posting by 15:00 on Wednesday prior to the bid opening.
INQUIRY SUBMITTAL FORM
LINKS OF INTEREST
Plan Sheet / Specification
Reference= TMS various
services, sheet E3 note 1, sheet E10 note9, sheet E24 note 1,
Question= The services
listed above call out for various sized
transformers to be installed in the service pedestal. The transformers
called for are 2, 3 & 5kva 480-120 or 480 - 120/240 volt 1 phase.
minimum average sizes for these transformers from Acme & Jefferson,
etc, are 13"h x 5.5"w x 5.1"d for the 2KVA, to 14"h x 7.5"w x 7.1"d for
the 5KVA. The space available per the standard plans page for the IIICF
shows approx 130mm (5.12")depth available on the load side. This space
as shown on the ES-2F page, is reduced by the dead front panel (see side
view upper left side of page ES-2F). Based on these transformer
dimensions and the requirement of the deadfront panel, which reduces
clearance, the transformers will not fit within a standard type IIICF.
Will a partial deadfront be allowed?
,or will the transformers be
in a pull box near the service?
Sheet / Specification
Question=With all due respect for
the intense effort by many Engineering and Management personnel and
towards an open and fair consideration of the two primary Microwave
Monitoring systems, we are raising an issue of proprietary and legal
significance. Specifically, the Special
Provision states that the MVDS proposed by the bidders must support
Wavetronix or EIS-RTMS protocol. We
feel the wording of the Special Provisions was intended to fairly
upon the technical criteria which would enable consideration of both
microwave products. However, several
criteria apply to only one product and do not apply to the other. We have provided a discussion on two issues
request clarification of another: Page 232 of the Special
Provision Section 10-3.14 MVDS – TECHNICAL REQUIREMENTS.
One of the technical
criteria states: “Analog and microwave
oscillators within the MVDS that are used to generate the transmit
be locked to a digital signal. The
Bandwidth of the transmit signal of the MVDS shall not vary by more
percent under all specified operating conditions and over the expected
the MVDS.”This specific statement
outlines a design technique and criteria which is unique to one
and protected by patent. This statement
eliminates consideration of other suppliers of the MVDS.
In essence this is a closed single source
In explanation, the EIS
RTMS does not lock to a digital signal for generating the operating or
transmitting frequency, but employs an equally stable phase lock
which is different than that outlined above and fully compliant with
rigorous stability requirements of the FCC. Further,
this alternative transmitter signal generation
enable the EIS RTMS to be fully compliant to the performance measures
accuracy required by other criteria listed in the Special Provisions
testing and validation of performance as listed on following page 234.
We respectfully request
that the wording be removed. Page
231 of the Special
Provision Section 10-3.14 MVDS – FUNCTIONAL REQUIREMENTS. and
Page 233 of the Special
Provision Section 10-3.14 MVDS – TECHNICAL REQUIREMENTS. One
states: “The MVDS shall be
configurable for 30 second to 24 hour polling cycles and store vehicle
speed, classification, and occupancy data in 10 second and 60 minute
intervals.”The normal operating
collection of data is in 30 second intervals. The
normal polling processes varies from 60 minute to 24
cycles. The specific statement
the request is worded such that it mixes data retrieval processes and
statistical storage concepts. This statistical interval
for storage and cycle for polling from a MVDS is bound up within the
system and firmware of the microwave sensor. The
operating system and firmware is defined on Page 231
FUNCTIONAL REQUIREMENTS. “B. The MVDS shall support
the Wavetronix “SS105 Smart Sensor version V2.02” or the EIS “RTMS
protocol version 6.8, or demonstrated equal.” The EIS RTMS data
version 6.8 provides for Statistical Data Storage Intervals from 10 to
secondsThe EIS RTMS data protocol
version 6.8 provides for data retention such that polling cycles from
to 24 hour are easily programmed into the MVDS system. We respectfully
that the wording change “store vehicle count, speed, classification,
occupancy data in 10 second and 15 minute intervals. Page 231 of the
Provision Section 10-3.14 MVDS – FUNCTIONAL REQUIREMENTS. One
states: “The contractor shall
install an MVDS Termination Assembly (MTA) as shown on the plans.”
criteria elaborating on the MTA are provided. With reference to the
Plans, Drawings E-42, E-43, E-44 and E-45 which pertain to the mounting
cabinet there are no references to the MTA. Is
the notation for sensor interface and / or
communications interface this
relationship or is it another contractor devised interface? Please
- Please refer to
Addendum No. 1
11 CONSTRUCTION BIDDER'S INQUIRIES & RESPONSES
OFFICE ENGINEER: Contract Advertisement, Special Provisions, Plan
Contract Awards, etc.