STATE OF CALIFORNIA, PETE WILSON,
- PUBLIC UTILITES COMMISSION
- 505 VAN NESS AVENUE
- SAN FRANCISCO, CA 94102-3298
March 13, 1998
- Dean Shauers, Project Manager
- Pacific Pipeline System, Inc.
- 12201 E. Arapahoe Road, C10
- Englewood, CO 80112
RE: Variance Request #50 - Allow for open cut
trenching (instead of boring) of Tuxford Street, City of Los
Angeles (Segment 3).
Dear Mr. Shauers:
We have reviewed the above-referenced variance
request and approve your request, based on the following factor:
- The Project Description in the EIS/SEIR
stated that "major roadways, interstate highways,
and freeways" would be bored. Open cut trenching at
this location has been requested due to the number of
existing and proposed utilities within Tuxford Street
that Pacific Pipeline would need to be bored beneath. The
right-of-way crossing at Tuxford Street contains eight
existing utilities that traverse the crossing. Potholing
of all existing utilities would need to be conducted to
identify the exact location of the utilities, requiring
lane closures and/or reroutes. In addition, the City of
Los Angeles proposes to place a 20-foot storm drain
within Tuxford Street where Pacific Pipeline crosses the
roadway. Based on the drawings for this storm drain, the
bore pit at Tuxford Street would have to be a minimum of
32 feet below the existing grade; excavations greater
than 20 feet require structural engineering design.
However, the City of Los Angeles has declined to provide
authorization in writing for this variance request, but
does not oppose the construction method.
- Tuxford Street is a five-lane roadway. To
mitigate potential traffic impacts on Tuxford Street
during trenching, PPSI proposes to use standard open
trenching methods, with half the roadway closed during
construction. This portion, when completed, would be
plated and the second portion of the roadway would be
trenched and plated. Traffic would continue to pass in
both directions with little delay using flagged controls.
Trenching activities are anticipated to require five to
nine working days. Given the temporary nature of the
traffic impacts and that vehicle passage would be
maintained, the potential impacts on traffic is mitigated
to maximum extent possible.
- Air quality impacts would be somewhat
reduced using trenching given the soil excavation
required to create a 32 foot deep bore pit.
- The following measures shall be
- All applicable mitigation measures for
the project shall be implemented at the subject location.
- Pipeline installation within Tuxford
Street shall be completed within 10 working days.
- Overhead utilities, including traffic
lights and railroad overcrossing bridge shall be protected
- Coordination with the Metropolitan
Transit Authority shall be conducted prior to construction
regarding the bus stop on eastbound Tuxford Street, east of
San Fernando Road.
- Given recurring flooding of the subject
area, monitor weather conditions and commence construction
across Tuxford Street when there is no rain forecasted for 10
days. Prior to construction, submit for review and approval
to Aspen Environmental Group the proposed plan for trench
support, traffic reroute (steel plates will float if area
floods), dewatering, etc., to be conducted if storm event
does occur during trenching operations.
- Prior to construction, provide City
approved copy of construction plans for trenching of Tuxford
Street to the CPUC Lead Environmental Monitor.
- One week prior to the construction
install signs on both side of the street in the vicinity of
the trenching site, informing the motorist of the
construction activities (the starting date and the projected
length of time).
- Implementation of this variance in
accordance with the provisions noted above shall be verified
on a random basis by a CPUC/ANF Environmental Monitor.
- Andrew Barnsdale
- Project Manager
- cc: R. Borden, ANF
- H. Rastegar, Aspen
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