HomeMy WebLinkAboutCity Council Committees - Public Works/Planning - 05/24/1988 r
PUBLIC WORKS COMMITTEE
MAY 24, 1988
PRESENT: JON JOHNSON KEN MORRIS
JUDY WOODS PRISCILLA SHEA
BERNE BITEMAN JOHN BUCKLEY - R.W. BECK
DON WICKSTROM SYLVIA BURGES - R.W. BECK
SANDRA DRISCOLL RON VERNESONI - EPA
BRENT MCFALL MARK SHAFFER - CONVERSE
GARY GILL GREG WINGARD
UPDATE ON WESTERN PROCESSING
Gary Gill introduced the consultants present to the Committee.
John Buckley distributed a status report to the members of the
Committee (copy attached) . He reviewed the contents of the
report. Buckley made comment about the level of efficiency of
the stripping system of the air emission procedure. Buckley
stated they have made comments to Puget Sound Air Pollution
Control Agency who is reviewing the procedure with Chem Waste.
Addressing the groundwater testing, Buckley referred to a seep
noted by EPA from the site into Mill Creek. The contractor did
not correct the problem adequately. Greg Wingard has noted this
problem. Another issue is a potential contamination plume
starting to move northwest off the site. In terms of surface
water, Mill Creek seems to be getting cleaner in terms of
contaminants that are being released into it. However, there is
still a question as to what is happening with the sediments.
The only way to determine the level of contamination of the
sediments is to go through another sampling program. The
consent decree covers the cleanup within the site boundaries but
it doesn't go any further down the creek. This issue might
impact Kent due to the development taking place downstream of
the site.
Greg Wingard commented the seep has been controlled, with a
retaining wall and have reseeded the area. He commented he has
not seen any results of the sampling from the site yet. Wingard
stated his concern about the plume is that he doesn't feel
evasive steps have been taken. He stated that Standard
Equipment has not been contacted about placement of additional
monitoring wells in Area VII. There has been a request for
barrier wells which is still being reviewed. He stated he has a
serious problem in waiting for the test data to define the
nature of the plume. He felt the existing data would indicate
you would expect to see a plume and that it has a potential for
acceleration. He felt the investigations into the plume should
start immediately.
Mark Shaffer of Converse distributed a map of the well
locations. (copy attached) The well in question is circled in
red. The first time the well was sampled was December, 1987
which showed contamination by four different compounds. The
schematic handout indicates that the middle sampling is what is
showing the contamination. The other monitoring wells in the
north end of the site do not show contamination with exception
of one of the 8M8 series and that is being double checked. The
second page of the written handout list possible sources of
contamination of the 7M26B well. The third page of the written
material lists those things that have been and are being done.
The barrier well in Area VII has been sampled and is clean. He
stated he felt the turnaround time of the laboratory data will
improve with the implementation of an onsite laboratory. Biteman
asked why probes couldn't be put down to determine the
contamination. Shaffer responded that it is probably too deep
for a probe. Ron Vernesoni added it is crucial to get the
barrier wells into Area VI. He stated they have been in
negotiations with Standard Equipment for about a year to get
this done.
Wingard stated there is indication the groundwater is moving
either west or northwest. He commented the barrier well
placement is not ideal. He commented about the concept of the
Area I wells drawing the plume. Ron Vernesoni stated he has
discussed this with Greg for several hours. He added that EPA
and Department of Ecology has a team of 5 hydrogeologists
working on this program.
It was determined this item was for the information of the
Committee and that no action was called for at this time. Gill
stated the City will be pushing for action on this.
REGIONAL WATER ASSOCIATION ANNUAL BUDGET
Wickstrom stated the City has been participating in the RWA for
approximately 5 years and have been contributing to the annual
costs of the program. It is proposed that instead of each
member contributing to the costs that a budget be established
and the participating agencies contribute an annual cost. The
City's share would be approximately $8,100. Woods moved the
City continue participation and contribute its share of the
annual cost estimated at $8,100. The Committee unanimously
approved.
ESTABLISHING DATES FOR REVIEW OF 1989 PUBLIC WORKS BUDGET
It was determined the Committee would review the Public Works
4 Budget at their meeting on June 28 at 3:00 p.m.
G.O. BOND ISSUE
Wickstrom stated that he is working with the Valley cities and
county in the formation of a TBD. Wickstrom stated he is
concerned that if Kent goes ahead with a G.O. Issue it could
complicate the implementation of the whole package. Driscoll
explained that currently there is no vote required to form a TBD
only when issuing bonds. That gets into some of the legal
issues. Part of the plan being discussed is going back to the
legislature and have the existing legislation amended to having
to go out to a vote to form the TBD. That may help cure some of
the problems. Wickstrom stated that at the last VTC meeting it
was recommended that the County be the lead agency and that the
City passes a resolution agreeing to participate in the
formationn of a TBD. Woods stated she thought the concept was
to use the G.O. bond issue to provide pressure to get the
project under way. Johnson stated he had hoped the issuance of
the bonds would be contingent upon all the other regional
participation and funding being available. It was commented
that having a TBD to vote on as well as a bond issue could be
confusing to the voters. Biteman asked if we were waiting for
action from VTC. Wickstrom responded that a letter from King
County Executive will be coming to Council with a sample
resolution. McFall stated that if we don't go for a bond issue
this fall we would be facing a very high validation percentage
next year. Woods stated that if proogress is being made she
would be reluctant to "muddy the water". It was decided to wait
until the City has received the information from the County.
REITH ROAD AND 260TH
Biteman stated he had gotten a call about No Parking on Reith
Road and 260th on the curb. He asked staff to look at it. Ken
Morris will report back to the Committee.
O'ROURKE MATTER
Biteman stated Mr. O'Rourke had contacted him about the survey
problems in an area on Benson. After discussion, it was
determined that it is a civil matter. The residents can have
the area resurveyed but it is not a matter the City can become
involved in. Biteman stated he would refer Mr. O'Rourke to the
City Attorney's office.
STOP SIGNS
Morris distributed a list of the top 20 accident locations in
1987 that are stop sign controlled. Some improvements have
already been made alleviating some of the problems. At 42nd and
212th, a left turn pocket has been installed. A 4-way stop has
been installed at 192nd and 80th Avenue, a 4-way stop at 2nd and
Meeker and a signal installed at 252nd and Pacific Highway S.
Three other intersections have signals planned - Meeker and
64th, 104th and 260th and 216th and West Valley Highway. There
was channelization and pavement marking improvements made at
Lincoln and Meeker. Left turn restrictions were placed at 212th
and Frager and Russell. Morris continued they are currently
going through the police citation records to determine where
there is a high incident of drivers running stop signs. This
will help make a final determination where the striping of the
stop sign posts should be placed. Biteman stated he would be
interested in knowing when accidents occurred as a result of
running the stop sign.
RELEASE OF COVENANTS - THE LAKES
The Lakes development had executed covenants for improvement
which have been constructed. They are asking that the covenants
be released now. Wickstrom asked for Committee approval for the
Mayor to sign the release. The Committee concurred.
i�
i
UU-1660-XS1-AA
R. W. Beck and Associates
CITY OF KENT
WESTERN PROCESSING SITE CLEANUP
Status Report No. 3
SITE WORK
o Approximately 25,000 cyds of contaminated material has been removed from
the site and hauled to Arlington, Oregon. The excavation areas were
backfilled and the groundwater extraction and infiltration systems have
been installed.
o The Groundwater Treatment Plant (GWTP ) building has been erected in Area
VII. Equipment installation is in progress. Surcharge for the air emis-
sion control system has been placed in Area I . The GWTP, including air
emission control system, is expected to be operational by August, 1988.
o Chemical Waste Management (CWM) has applied to Kent for water and sewer
permits. Revised information on the permits has been submitted by CWM.
Kent is in the process of issuing those permits.
AIR EMISSION ISSUES
o CWM has applied to the Puget Sound Air Pollution Control Agency (PSAPCA)
for an air quality permit for atmospheric discharge of organic compounds
stripped from the groundwater. The stripped organic compounds are pro-
posed to be adsorbed onto activated carbon. The activated carbon will be
periodically (10 hours/day) regenerated with hot air. The organic com-
pounds in the hot air will then be thermally destroyed in an incinera-
tor. We have reviewed the permit applications; our basic concerns are as
follows ;
- Air quality modeling was not based on local data or conditions.
- The risk assessment was based only on a single indicator species
(dichloromethane-methylene chloride).
- Air emission allowance for HC1 (acid gas discharge) appears to be
very 'liberal .
- No data was presented for the basic assertion regarding performance
of the proposed equipment (methylene chloride adsorption onto acti-
vated carbon.
- The proposed incineration system appears to operate, at relatively
low temperatures with a short residence time. In making judgements
on these issues, there is a questions as to whether the proposed
incineration is a "fume" incinerator or a hazardous waste inciner-
ator.
Emission monitoring is not adequately addressed.
We understand that CWM is preparing a response to our concerns.
City of Kent -
Status Report No. 3 Page 2
WATERBORNE TOXIC RELEASE ISSUES
A. Groundwater
o There have been several conceptual changes in the Trostee' s ground-
water remediation plan.
o In early April, groundwater test data became available which indi-
cated a potential contamination plume spreading westward from Area
I into Area VII (location of the Groundwater Treatment Plant) . The
principal indicator species (oxazolidone) was found in Monitoring
Well 7M26B located on the south tip of Area VII (See Figure 1).
Oxazolidone is a semi-volatile organic chemical found throughout
Area I, generally ranging in concentrations of 1 to 30,000 ppm.
Prior to receipt of the test data, it had been generally thought
that groundwater contamination, other than the "trans" plume, had
remained under Area I and on the east side of Mill Creek.
- The Monitoring Well 7M26B data tends to support a hypothesis
that Area I contamination is migrating to the west or north-
west.
- Further analysis of the data is needed to verify the above
hypothesis. EPA has indicated that such analysis should be
complete by the end of May.
EPA and the Trustee's are attempting to secure permission
from Standard Equipment to install monitoring wells in Area
VI.
EPA is also considering installing a moniiar well in the
196th St. right-of-way at the north-west corno,oi? Area VI.
Installation of these monitoring wells would give valuable
data on off-site contamination migration.
B. Surface Water
o Mill Creek is currently receiving contamination from the Area I
site via shallow groundwater migration and seepage. Such releases
will continue until the slurry wall is installed , Oad, the ground-
water extraction and treatment system is in ope ratfon, A visible
seep was spotted by Greg Wingard recently, coming from the location
of a pipeline that was removed last summer. CWM hAs recently in-
stalled a bentonite cutoff wall to stop the seepage. The effec-
tiveness of this cutoff wall will be monitored weekly until the
slurry wall is installed and the groundwater extraction system is
operational.
City of Kent -
Status Report No. 3 Page 3
o There is little information on sediment contamination in Mill Creek
downstream of the Western Processing site. The sediments are sus-
pected of being contaminated with heavy metals, although the level
and extent of contamination is not known.
Kent is in somewhat of a dilemma regarding this downstream contami-
nation. Owners of property through which Mill Creek runs may want
to develop their property in the vicinity of the Creek. If Kent
grants permits (i. e. , development rights) and damage occurs due to
sediment contamination, Kent may be involved in any ensuing litiga-
tion because of its knowledge of the suspected contamination. Con-
versely, Kent may be sued if it unduly restricts property develop-
ment in the vicinity of Mill Creek without an adequate basis for
such restriction.
Given the above situation, it may be desirable for Kent to sample
Mill Creek sediments and determine if contamination does exist and
to what extent. This information may be useful to Kent in granting
future permits (development rights). In addition, this information
may be useful in "reopening" the Western Processing consent decree
relative to cleanup of the Mill Creek sediments under Phase III.
(1306e)
s
R. W. Beck and Associates
5/20/88
Seep from Area I to Mill Creek
The Issue
o In February 1988 EPA discovered water seeping from Area I into Mill
Creek in an area where Chemical Waste Management (CWM) had removed
a 10 inch drain line. CWM reported that they had removed all
gravel bedding material associated with the drain line and backfil-
led the trench with impervious soil. CWM was instructed to correct
the problem. "
o Greg Wingard noticed speepage at the subject location on April 15,
1988. Discolored vegetation within the seepage discharge zone was
also noticed.
Actions Taken
o CWM sampled seepage water and soil at the point of discharge; metal
levels in the soil were of the same order of magnitude as general
site levels. Levels of metals in the water samples were much lower
than those in the soil, but still above background.
o CWM placed a retaining wall of untreated timber lined with plastic
to prevent movement of surface materials into creek (see sketch).
o CWM dug a trench 18"-24" deep and filled it with an impervious
grout/bentonite mixture to cutoff subsurface flows to creek (see
sketch).
o Seepage has been correlated with rainfall ; the preliminary conclu-
sion is that the seepage is the result of local percolation from
rainfall accumulation between the mini-beam and site berm.
o Contamination along Mill Creek will be removed during Mill Creek
cleanup and restoration.
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