SR-14-C (3)
INFORMATION
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RELATED TO ITEM 14-F
JUN 2 4 J996
JUL - 1 It"
Santa Monica, California
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June 23, 1986
ITEM
To:
Mayor and City Council
From:
city staff
Subject:
Pico-Kenter Canyon Storm Drain Alternatives
Introduction
This report presents the status of staff activities regarding the
Pico-Kenter storm drain and gives a proposed time schedule for
future activities which attempt to find solutions to this
long-standing beach related problem.
Background
The discharge of surface drainage water from the storm drain
run-off system which occurs at the end of the Pico-Kenter
concrete outfall structure normally flows over the beach to the
surf line which is 350 feet away.
Due to the annual storm
generated waves and tidal flows during the rainy season, a sand
bank or "berm" often forms inland of the surf line on the beaches
from north of the Santa Monica Pier to beyond the Southerly city
limits. This results in low lying areas between the berm and the
Promenade.
This condition can aggravate the problem of
summertime storm drain discharges onto the beaches, notably at
the Pico-Kenter Canyon storm Drain, and can cause the ponding of
effluent during the low-flow seasons.
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Discharges from the low- flow storm drain are monitored by both
the County Heal th Department and the ci ty' s General Services
Department (Water Division). Analysis has shown that while there
are traces of volatiles present (TCE, and chloroform), the
measurable levels do not exceed the minimum standards approved
for drinking water. Bacteriological contamination, however, is
often present. This is a common condition in urban storm drain
run-offs due primarily to animal feces (as proven by tests of
this storm drain effluent). This high content of organisms
indicating the presence of such bacteria has prompted the County
Heal th Department to post notices at the end of the outfall
structure indicating the ponded water to be unfit for human
contact.
According to County Health officials and City tests, this
bacteriological contamination is the major problem present in
storm drain outfalls. This contamination is not considered a
heal th hazard to swimmers or waders once it reaches the surf
because of the immediate dilution by sea water. The problem
faced by the City and the county is how to transfer the
contaminated water to the surf while at the same time eliminating
the possibility of persons coming in contact with it until it is
safely diluted.
Discussion
A number of alternatives were studied by a task Force consisting
of engineering and public health staff from the City of Los
Angeles, the County of Los Angeles and the City of Santa Monica.
The alternatives which are under review include:
- 2 -
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1. Re-grading and Increased Maintenance Activities as an
interim measure, City forces have re-graded the area of the
beach where the "large pond" was formed by the surf tocreate
openings through the berm, to allow drainage. The city has
also installed a drain line from the storm drain structure to
the surf to transport the water across the beach and to
reduce the possibility of contact with the contaminated
water. This alternative can be more fully implemented by
increasing the capacity of the drain line, but since the
drain line would be clogged and perhaps damaged by winter
storms, it would have to be removed prior to each winter
storm season.
2. Diversion of Effluent to Sewer system an additional
alternative which was explored was to divert the low-flows of
the storm drain to the nearest tributary line of the sewer
system, where the drainage would be disposed of as part of
the City's sewage flow treated at the Hyperion Treatment
Plant. Implementation of this plan is dependent on the
authorization of the Treatment Plant Operators, and has been
denied (see Attachment I).
3. Diversion of low-flows to the nearest tributary line and then
to the Ashland Avenue storm Drain --(see analysis of
alternatives below).
4. Diversion of low-flows to the storm drain beneath the Santa
Monica Municipal pier -- (see analysis of alternative below).
- 3 -
.
.
Analysis of Alternatives
Alternative 3 appears to be the most cost-effective of the
various alternatives studied and this alternative is supported by
the County Health Department (see Attachment II) .
This alternative results in eliminating the problem at Pico and
causes no adverse changes at the Ashland drain, which is
constructed with an outlet reaching to the surf line. staff has
discussed this alternative with two members of the OPCO board,
but no consensus was reached regarding this alternative. There
have been recurring odor problems on Main street caused by the
surf plugging the Ashland Drain with sand. Diverting additional
low flow waters to the Ashland Drain may improve this situation
by washing the sand out more frequently. Staff believe the newly
adopted waste ordinance, which will force all restaurants to
install grease traps and wash racks, will also help to mitigate
the odor problem of the Ashland storm Drain. Staff plans to hold
a public meeting (which also has been requested by OpeO) in Ocean
Park in July regarding this alternative unless Council directs
otherwise.
Alternative 4 has essentially the same advantages and the same
relative costs as Alternative 3. However, the pier storm drain
awaits the second phase of reconstruction (including funding by
the County) and thus will take approximately nine additional
months to accomplish as compared with Alternative 3.
- 4 -
.
.
Proposed Time Schedule for Alternative 3
. Meet with Ocean Park Residents and
Business Owners
July-Aug 1986
Report to Council and obtain authorization
to proceed
September 1986
Design improvements
November 1986
Award Contract
January 1987
Construction
March-April 1987
Estimated Cost Impact to City
The total cost of Alternatives 3 and 4 is estimated at $225,000.
The County has already agreed to fund one-third of the
construction costs for storm drain diversion ($75,000) and to pay
for maintenance and design. The City of Los Angeles is also
expected to pay for one-third of the costs ($75,000). The
projected cost to the City of Santa Monica is therefore estimated
to be approximately $75,000.
Conclusion
staff will continue to implement and evaluate interim measures
currently in place to reduce the ponding of low flow effluent.
Staff will also proceed with evaluation of Alternatives 3 and 4
according to the time schedule detailed above.
Prepared by: Stan Scholl, Director of General Services
Neil Miller, Assistant Director of General Services
Ed Lash, Utilities Manager
Attachments
(KENTER)
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