HomeMy WebLinkAboutMINUTES - 09121995 - C172 C.172 and C.173
THE BOARD OF SUPERVISORS OF
CONTRA COSTA COUNTY, CALIFORNIA
Adopted this Order on September 12, 1995 , by the following vote:
AYES: Supervisors Smith, DeSaulnier, Torlakson and Bishop
NOES: None
ABSENT: Supervisor Rogers
ABSTAIN: None
SUBJECT: Correspondence
C. 172 LETTER dated August 8, 1995, from Patrick K. Pang, District Office Chief, State
Department of Transportation, P. 0. Box 23660, Oakland, CA 94623, advising that Caltrans
Routes Highway 13/Highway 24 Interchange Reconstruction Project, will be added to the
Department of Toxic Substance Control's list of projects being issued a Lead Variance for
contaminated soil, and proposed handling of the soil.
***
* REFERRED TO HEALTH SERVICES, DIRECTOR
C. 173 LETTER dated August 17, 1995, from Kim Sloat, Manager, Gas Transmission, Pacific Gas
and Electric Company, 650 "0" Street, Fresno, CA 93760, enclosing action plan for
emergency repair work on P.G. & E.'s gas transmission facilities.
**** REFERRED TO PUBLIC WORKS, DIRECTOR
IT IS BY THE BOARD ORDERED that the recommendations as noted (****► are APPROVED.
I hereb7 certify that this Is a MteandobnmctcoPYof
an action taken and entered on the minutes of the
Board of supero sora an�the date
ATTEPHI$' TC ELOR Clark of ffoard
of suparvisots and Administrator
c.c. Correspondents 8
Health Services, Director
Public Works, Director
STATE- ALIFORNIA-BUSINESS,TRANSPORTATION AND HOUSING AGENCY PETE WILSON, Governor
—c�
'DEPARTMENT OF TRANSPORTATION DECEIVE®
60X,23660 .*
OAKLAND,CA 94623-0660
(510)286-4444
August 8, 1995 AUG 1 4 1995
CLERK BOARD OF SUPERVISORS
Ms . Jeanne Maglio CONTRA COSTA CO. m!
Contra Costa County Clerk of the Board
651 Pine Street
Martinez, CA 94553
Dear Ms . Maglio:
This letter is to inform you that Caltrans ' Routes 13/24
Interchange Reconstruction Project will be added to the current
Department of Toxic Substance Control ' s (DISC) List of projects
for which a Lead Variance was issued.
As a part of the Routes 13/24 project , Caltrans proposes to
handle the excavated contaminated soil in two stages . The first
stage will involve removing and transporting the contaminated
soil from the project site to an area within State Right of Way
at the northeast quadrant of the Gateway Boulevard/Route 24
interchange in City of Orinda in Contra Costa County. The haul
distance is about 2 . 5 miles . The second stage will involve
constructing an embankment fill with the contaminated soil . The
embankment will then be encapsulated with one foot of clean
material . Enclosed is a plan showing the limits of the corridor
where the lead-contaminated soils will be excavated and buried.
Also enclosed for your information is a list of Caltrans
projects already included in the Lead Variance issued by the
DTSC and a copy of the Caltrans Variance for Reuse of Lead
Contaminated Soils dated February, 1995 .
If you have any further questions, please call me at
(510) 286-5125 or Arthur Dao, Assistant Project Manager, at
(510) 286-5710 .
Sincerely,
JOE BROWNE
istrictrector
00 By `�
PATRICK K. PANG
District Office Chief
Design Alameda II
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of State of California
California Environmental Protection Agency
Department of Toxic Substances Control
~ � ° Caltrans Variance
`,(UoFt
,'s�. For Reuse of Lead Contaminated Soils
Fcbrwr-y 1995
The California Environmental Protection
Agency, Department of Toxic Substances
Control (DTSC) prepared this fact sheet to
describe the California Department of
Transportation (Caltrans) request to collect and
reuse soil containing low levels of lead. The
request applies only to various freeway
construction sites in Southern California and in
the San Francisco Bay Area. Normally, state a
and federal environmental rules would require
Caltrans to go through a complex bureaucratic
process to deal with every location in which
crews found lead in the soil. Those same rules, 8
however, allow DTSC to grant what is called a 7
"variance" if certain conditions are met. This
fact sheet covers:
12 11
• Background Caltran Districts
• Caltrans Request (Those numbered are affected by variance.)
• Health Risk Assessment highways need to be widened because so many
• The Variance cars and trucks use them. When Caltrans
• Information Sources widens a road, it either fills-in the median, the
area between existing lanes of traffic, or it
The variance will allow Caltrans to reuse soil makes another lane from the existing shoulder.
containing lead, as long as it is handled Caltrans has many widening projects in work or
properly, replaced along the same section of planned.
highway (within the freeway corridor) and
covered with clean soil or roadway. The goals Until the mid-1980s, gasoline and other fuels
are: to make sure that the lead will stay where contained lead, a toxic metal..As each car or
it is placed; and that neither humans nor truck traveled the highways, tiny particles of
animals can come into contact with it. The lead came out in the exhaust and settled on the
variance will be in effect for 10 years. soils next to the road. Most of the time, lead
Background tends not to move very far or very fast in the
environment. Over the years, lead built-up
Caltrans is the state agency that builds and
alongside the highways.
maintains the state's highways. Several of those
1
Caltrans highway-widening projects disturb the Caltrans stated that each of these proposed
soil, some of which contains this lead. The uses keeps the lead-containing soil in defined
regulations specify at what levels lead in soil is areas. Also, those are areas in which people
considered to be a hazardous waste. In some spend little, if any time, so they would not
areas where construction will occur, Caltrans come into contact with the lead.
has found levels of lead that are higher than
allowed. For the most part, Caltrans found lead In addition, Caltrans proposed putting special
within 30 feet of the edge of the pavement, and sections in their contracts with the construction
within the top six inches of soil. Sometimes, the contractors. Those sections would require
lead is as deep as two to three feet below the contractors to handle the lead-containing soil in
surface. Since the soil contains these levels of certain ways. For example, soil found to
lead, Caltrans must comply with environmental contain lead would be kept separate from clean
regulations or seek a variance from the soil, and the contractor would have to take dust
regulations. control and security measures to keep people
from coming into contact with it until it was
Caltrans Request reused.
In November 1994, Caltrans asked DTSC to Finally, the lead would stay in place (beneath
grant a variance from the hazardous waste rules the roadway, etc.) for the life of the highway.
to allow road construction projects to reuse Even though modern freeways are designed to
lead-containing soils on the project site. last only 30 to 50 years, Caltrans notes that
Although the level of lead found in some areas additional upgrades and widening are much
is higher than that what is considered to be a more likely than abandoning old freeways.
hazardous waste, Caltrans stated that it could Therefore, the lead remains secure, and human
reuse the soil along the roadway under health and the environment are protected.
construction without the lead posing a threat to
human health or the environment. At present, Caltrans is developing many
construction projects where it expects that
Caltrans identified several potential uses for the contractors will find lead in the soil. Those
soil containing lead. Those include: freeway projects are described in the insert.
• To build embankments at freeway Caltrans requested that the variance apply to
overcrossings and interchanges; projects in the counties identified, over a period
• for the small hills Caltrans sometimes of 10 years, however, so the list is not
creates along parts of roads; complete.
• to use as backfill for structures, to
replace soils which construction crews Health Risk Assessment
remove to construct sound walls and
the like; In reviewing the variance request, DTSC
• to re-fill trenches and holes created by scientists studied how people might be exposed
removing obstacles, such as trees and to the lead left in soil, and how best to protect
barriers that are no longer needed; their health. These scientists concluded that
• as roadbase fill, to level=out the ground; Caltrans could reuse soil containing lead as
• to raise ground level for building park- long as the lead is below a certain level, and if
and-ride lots; and people are kept from coming into contact with
• to put under new roads.
2
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the lead-containing soil. This section describes • DTSC specified lead levels for which
the DTSC scientists' conclusions about the Caltrans must take certain steps (see
potential risks from the lead and how those table on next page).
risks can be reduced.
• Caltrans will properly dispose of lead-
Lead is toxic, and it is present everywhere in containing soil for which it has no on-
the environment, most often at very low levels. project-site use.
If lead gets into the body above certain levels, it
can cause damage to the nervous system or • Caltrans must keep whatever lead-
blood cells. Children are at the highest risk containing soil that it digs up in the area
because their bodies are still developing. In of contamination, and must keep it
children, even relatively low blood lead levels covered with thick plastic until it is
can cause learning disabilities. However, lead reused.
must get into your bloodstream to harm you.
• Caltrans may only reuse the soil in the
People can get lead into their blood in several within the freeway corridor from which
ways. Adults, and especially children, swallow it came.
lead that is attached to small dirt particles,
either blowing around and getting into their • Caltrans will not reuse the lead-
mouths, or on their hands. People can also containing soil where it could come into
swallow lead if it has gotten into drinking contact with workers (others are
water. There are other"routes of exposure," unlikely to be on or near freeways for
as the scientists call them, but DTSC does not any prolonged period of time), plants,
believe that those routes apply in this case. and ground or surface water; and the
soil must put it where it will be
The variance takes into account the scientists' protected from erosion and runoff.
conclusion that people should not be exposed
to levels of lead above those found throughout • Caltrans will keep records and provide
the environment. It specifies what Caltrans can detailed reports to DTSC when it
do with soil containing lead, as described handles the soils containing lead.
below. Caltrans will make copies of those
records available to the public at its
The Variance District offices, and at appropriate field
engineer offices.
After reviewing Caltrans' request for variance,
and consulting with its health risk scientists, The variance contains several other detailed
DTSC hazardous waste managers decided to technical requirements, as well.
approve the variance, with special provisions.
This section outlines key conditions of the
variance.
• Caltrans must sample and test soils for
lead content.
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To put the numbers shown in the table in context, soil containing lead is considered a hazardous waste
if the total lead level is more than 1,000 parts per million (ppm), or if the soluble lead level is more than
5 ppm. Soil naturally has small amounts of lead in it, about 50 ppm. City soils commonly contain 200
to 500 ppm of lead.
Extractable Total Lead Caltrans may take the following steps
Lead
less than less than Soil may be reused, as long'as it is placed at least two
0.5 ppm 1,575 ppm feet above the water table and covered with one foot
of clean soil.
more than more than Soil may be used as fill, as long as it is placed two
0.5 ppm 1,575 ppm feet above the water table and covered with pavement
but or similar cap.
less than
4,150 ppm
' These numbers relate to tests that determine if the]cad is likely to move in water through the environment.The figures arc in
parts per million,and arc approximate conversions from micrograms per litre(NII).
' Total lead is just that,the total amount of lead in the soil.The numbers sho\tiii are in parts per million,approximate
conversion from milligrams per kilogram(mg/kg).
Information Sources can refer people to field engineer's offices where
project-specific information can be found. In
Because this variance covers Caltrans activities in addition, the DTSC contact is available to answer
17 counties for a period of 10 years, DTSC has questions.
required that Caltrans establish central points of
contact, by district, and to put in place methods for The full Administrative Record pertaining to this
making inforniation available to interested members matter is available for review at the DTSC address
of the public. At present, Caltrans knows that it will shown below. Anyone interested in obtaining copies
be handling soil containing lead along various of this or future fact sheets about the project should
freeways in the Caltrans districts shown below. The contact DTSC Public Participation Coordinator
District offices will maintain information about the Carol Northrup, either at the DTSC Berkeley
variance,'and about instances when m soil containing address shoN� below, or by calling (5 10) 540-3928.
lead is handled. The Caltrans staff in those districts
San Francisco Bay Area LA/San Bernardino Orange Co./San Diego
Cal/EPA-DTSC Region 2 Caltrans District 7 Caltrans District 1 1
Contact: Sara Picker Contact: Ron Kozinski Contact: Dean Hiatt
700 Heinz Ave., Suite 200 120 South Spring Street 2829 Juan Street
Berkeley, CA 94710-2737 Los Angeles, CA 90012 San Diego, CA 92110
(510) 286-3973 (213) 897-0467 (916) 688-6461
Caltrans District 4 Caltrans District 8 Canitrans District 12
Contact: Tim Mehta Contact: Tony Louka Contact: Vinh Pham
1 I 1 W. Grand Avenue 247 West Third Street 2501 Pullman Street
Oakland, CA 94623-0660 San Bernardino, CA 92402 Santa Ana, CA 92705
(510) 286-6269 (909) 383-4042 (714) 724-2097
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