HomeMy WebLinkAboutReso. 1989-117 - Authorizing and contract for proffessional services between the city of redding and lawrence & associates li0
RESOLUTION NO. g9"//7
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF REDDING
APPROVING THE AUTHORIZATION AND CONTRACT FOR PROFESSIONAL
SERVICES BETWEEN THE CITY OF REDDING AND LAWRENCE &
ASSOCIATES FOR PREPARATION OF A PRELIMINARY CLOSURE PLAN FOR
THE BENTON LANDFILL, AND AUTHORIZING THE CITY MANAGER TO
kk SIGN SAME.
IT IS HEREBY RESOLVED by the City Council of the City of
Redding as follows :
1 . That the City Council of the City of Redding hereby
approves the Authorization and Contract for Professional Services
entered into between the City of Redding and Lawrence &
Associates for preparation of a Preliminary Closure Plan for the
Benton Landfill, a true copy of which is attached hereto and
;1 incorporated herein.
2 . That the City Manager of the City of Redding is hereby
authorized and directed to sign said Authorization and Contract
on behalf of the City Council of the City of Redding, and. the
City Clerk is hereby authorized and directed to attest the
signature of the City Manager and to impress the official seal of
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the City of Redding on the aforesaid document, when appropriate.
I HEREBY CERTIFY that the foregoing Resolution was
introduced and read at a regular meeting of the City Council of
the City of Redding on the 18th day of April , 1989 , and was
duly adopted at said meeting by the following vote:
AYES: COUNCIL MEMBERS: Buffum, Dahl , Fulton, Johannessen and Carter
NOES: COUNCIL MEMBERS : None
ABSENT: COUNCIL MEMBERS: None
ABSTAIN: COUNCIL MEMBERS: None / '
,,</z0e7Z--4/
.; SCOTT CARTER , Mayor
City of. Redding
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ATTEST: FO iAPPROVED:
,o 77;1--• -7
ETHEL A. NICHOLS, City Clerk RA DALL A. HAYS , City Attorney
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LAWRENCE & ASSOCIATES:','y
Engineering Geologists • Ground-water Hydrologists `CLIENT COPY
2001 MARKET ST..RM. 523 a.
REDDING.CALIFORNIA 96001 • -
TELEPHONE(916) 244-9703 DAVID A. LAWRENCE,C.E.G.618
AUTHORIZATION AND CONTRACT FOR PROFESSIONAL SERVICES
! Date March 29, 1989 Project Number C89. 03 . 09
Project Name Benton landfill closure plan
Client City of Redding, Attn: Ron Massingale (916) 225-4090
Address 760 Parkview Avenue, Redding, CA 96001
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Client hereby requests and authorizes Lawrence & Associates to
perform the following services: Provide services to prepare
Preliminary Closure Plan for the California Waste Management
Board, as detailed in the enclosed Attachment A. Work to include
topographic contour map prepared by CH2M Hill Engineers, .as
detailed in Attachment A.
Compensation to be on the basis of: Time and expense in
accordance with the Cost Estimate set forth in Attachment A, and
the Fee Schedule, Attachment B. Estimated cost of work:
Lawrence & Associates labor $32,840.00
Outside services 11,461. 19
44,301. 19
10 percent contingency 4,430. 12
Total $48,731. 31
Miscellaneous: Client to provide drivable access to landfill
sites for field testing.
This authorization subject to PROVISIONS stated on the back of
this contract
Approved for CLIENT Accepted for LAWRENCE & ASSOCIATES
By By .CLG�!rc. 1 / e,U
Title Title //,
Address Date 3/Z 2,9
Date f
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PROVISIONS v f,
• 1. AUTHORIZATION TO PROCEED:`P'Signingthis form shall be constru`:. es authorization by
Client for Lawrence A Associates to proceed with the work unless otherwise
p provided herein.
.: - . - :-epi ii '.nes ... ,... ' 'i"..,,.,. •,.-,
2. pIRECT EXPENSES: Lawrence S Associates' direct expenses shall be those costs . 7
incurred on or directly for the Client'.i Project, including but Mot limited to, 'necessary
transportation costs, including mileage, meals and lodging, laboratory tests and analyses,
i computer services, telephone, printing and binding charges. Reimbursement for these expenses
shall be on the basis of the attached Schedule of Fees. Statements for services are due five
days after being mailed to the Client.
3. OUTSIDE SERVICES: When technical and professional services and subcontracted labor
tl � and equipment are furnished by an outside source, reimbursement for these expenses shall be on
the basis of the attached Schedule of Fees. Lawrence 6 Associates may require the Client to
pl contract for, and
pay for, these services directly.
4. PROFESSIONAL STANDARDS: Lawrence & Associates shall be responsible to the level of
competency presently maintained by other practicing professional engineers In the same type of
work in Client's community, for the professional and technical soundness, accuracy and adequacy
of all designs, drawings, specifications and other work and materials furnished under this' '-'
Authorization. Lawrence & Associates and/or David A. Lawrence make no other warrant
y, express
or implied.
S. TERMINATION: Either Client or Lawrence & Associates may terminate this Authorization
by giving 30 days' written notice to the other party. In such event, Client shall forthwith
li pay Lawrence & Associates in full for all work previously authorized and performed prior to the
effective date of termination. If no notice of termination is given, relationships and
obligations created by this Authorization shall be terminated upon completion of all applicable
requirements of this Authorization, except for the provisions of paragraphs 4, 6, 7 and 8,
which shall continue in effect as provided by law.
6. ARBITRATiOt: All claims, disputes and other matters in question arising out of, or
relating to, the work performed hereunder, this Authorization, or the breach thereof, shall be
decided by arbitration in accordance with the rules of the American Arbitration Association
then obtaining. Either Client or Lawrence & Associates may initiate a request for such
arbitration. No arbitration arising out of, or relating to, this Authorization may include,
by consolidation, joinder or in any other manner, any additional party not a party to this
Authorization unless agreed to in writing by both parties.
7. HOLD HARMLESS: Client agrees at all times to defend, indemnify, hold harmless and
provide all legal defense and related services to David A. Lawrence, Inc., Lawrence &
Associates and/or David A. Lawrence (hereinafter collectively "Lawrence"), their officers,
associates, agents and/or employees for any and all claims, expenses, demands, causes of
action, liability, loss or injury regardless of their nature or character in any manner
11' whatsoever arising out of (1) any third person's use or reliance on the work performed under
NI, this Agreement; (2) any alleged or proven act or omission of Lawrence; or (3) any litigation or
arbitration, or the like, 'regarding the work performed under this Agreement involving third
" persons not parties to this Agreement.
+' + 8. LITIGATION: Liability for damages proximately caused by David A. Lawrence, Inc.,
Lawrence & Associates and/or David A. Lawrence, or their agents, officers or employees shall
be limited to cancellation of the sums due and owing or recovery of the sums already paid to
Lawrence & Associates by Client. In the event the Client makes a claim against David A.
Lawrence, Inc., Lawrence & Associates and/or David A. Lawrence, at law or otherwise, for any
ji alleged error, omission or other act arising out of performance of our professional services,
and the Client fails to prove such claim, then the Client shall pay all costs incurred by
j' Lawrence & Associates and/or David A. Lawrence in defending itself against the claim.
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LAWRENCE & ASSOCIATES
Engineering Geologists • Ground-water Hydrologists
2001 MARKET ST.,RM.523
REDDING,CALIFORNIA 96001 • _
TELEPHONE(916) 244-9703 DAVID A. LAWRENCE,C.E.G.61$
City of Redding
March 29, 1989 Attachment A
PROPOSAL FOR SERVICES
BENTON LANDFILL CLOSURE PLAN
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INTRODUCTION
Existing State legislation requires a "Closure and Postclosure
Maintenance Plan" (Closure Plan) to be developed for any proposed
or existing landfill. The Closure Plan requirements are set
forth by two agencies, the Solid Waste Management Board (WMB) and
the Regional Water
g Quality Control Board (Regional Board) .
Requirements for the Plan under the WMB are set forth in Title 14
of the California Administrative Code (CCR) , and for the Regional
Board in Title 23, Subchapter 15 of the CCR.
AB 2448, Eastin, September 28, 1987 added Section 66796.22 of the
Government Code requiring, in part, that landfills in existence
on or before January 1, 1989 that a Closure Plan be submitted on
or before July 1, 1990 if the landfill will be closed within 5
years of the effective date of this legislation, which would be
applicable to the Benton Landfill.
The Regional Board set requirements for a Closure Plan in their
Waste Discharge Requirements that calls for the Closure Plan to
be submitted within 180 days of the landfill reaching capacity.
(Normally, the Regional Board calls for a Closure Plan within 180
days following issuance of the Waste Discharge Requirements. )
Section 66796.22 of the Government Code additionally mandates
[ that the WMB adopt regulations on or before July 1, 1989,
specifying closure plan and postclosure maintenance plan adoption
procedures and uniform closure and postclosure standards. In
response to this, the WMB promulgated on February 7, 1989 the
PROPOSED DRAFT REGULATIONS - Closure and Postclosure Maintenance
Plan adoption Procedures and Uniform Standards for Closure and
Postclosure of Solid Waste Landfills, dated February 1989.
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• ' City of Redding Attachment A
March 29, 1989 Page 2 of 18
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The Proposed Draft Regulations (PDR), have closure requirements
that are different from the Regional Board requirements, but at
the same time address those differences and call for a uniform
p � approach to the requirements and evaluation of closure plans by
the WMB, the LEA, and the Regional Board.
With respect to the final cover requirements,quirements, the PDR sets forth
standards that vary from the Regional Board requirements. Both
agencies call for a "multilayered" cover, but the WMB requires
the cover to be designed and installed to "minimize" problems
such as nuisance factors, erosion, and water infiltration. This
is different from the Regional Board cover requirements which set
absolute standards for each layer, such as "maximum density" for
the foundation layer and a permeability requirement of 10-6
cm/second for the clay layer.
DIRECTION OF PROPOSED CLOSURE PLAN
In view of the existing and proposed legislation involving
closure plans and, more specifically, final cover, it was agreed
upon in a meeting held in the office of Lawrence & Associate with
Ron Massingale and Lefty Hastings of the City of Redding, and
David Lawrence of Lawrence & Associates, that the Closure Plan
would evaluate the existing cover at the Benton landfill in terms
1 of the PDR.
The above decision was made for two reasons: (1) the PDR
approach to cover requirements could be considered less stringent
than the Regional Board requirements, and (2) because the WMB was
taking the initiative in drafting new legislation, and appeared
, 1 to be preempting some of the responsibilities heretofore assumed
by the Regional Board, the Closure Plan would be directed to the
WMB in terms of their proposed standards, and that the completed
plan would also be sent to the Regional Board for their approval.
In addition to the decision on how to treat the final cover, it
was agreed to provide a Closure Plan that was complete in its
requirements. Providing a complete document would not allow the
agencies to reject the plan for reasons other than the final
cover, and this would more or less force the issue with the
cover.
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111 410
City of Redding Attachment A
March 29, 1989 Page 3 of 18
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WORK PLAN •
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The following work plan follows the outline in Section 18261 of
the PDR. Although the PDR is somewhat repetitious and wordy in
defining standards, the following outline is used so the reader
can refer to the applicable sections of the PDR. For clarity,
sections referenced from the PDR are shown in underline.
The PDR calls for a "Preliminary Closure Plan" and a "Final
Closure Plan. " The following proposal addresses the preliminary
plan which must be approved
before a final plan can be developed.
The final plan would include additional items such as list of
materials, contractors, etc. , which will actually be involved in
the physical closing of the landfill. Also, the final plan would
treat the final cover either as proposed in this Closure Plan, or
as directed by the WMB following review of the preliminary plan.
The estimate of costs for completing the work follows the same
. i format as the work outline.
WORK OUTLINE
Section 18261. Contents of the Closure Plan
(b) Preliminary closure plan
(1) The preliminaryclosure plan (PCP) requires less
specificity than the final plan, and at a minimum should include
information to:
(A) Allow the operator to prepare an estimate of
closure costs.
jJ Enable the Board and LEA to assess the
reasonableness of the cost estimate.
(C) Allow certification of the cost estimate.
Ii (2) The PCP shall be written to describe closure in
conformance with standards set forth in Chapter 3.„ Article 7.8.
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City of Redding Atthment A
March 29, 1989 Page 4 of 18
(3) The PCP shall identify steps necessary to perform
, partial and/or final closure at any point in the active life of
1 ' the landfill. The PCP shall include the following information:
b ,
(A) A facilities map and adjacent land use within 1
mile of the property boundary, and current monitoring and control
Gid systems.
Discussion: Current monitoring facilities consist of the water
and gas-monitoring wells. The ground-water monitoring wells are
described in the SWAT Report and other reports prepared by
Lawrence & Associates. The gas-monitoring wells are to be
described in the Calderon Air work presently in progress.
Existing control systems include the leachate collection system
H located near the toe of the landfill. This system is also
described in the SWAT Report.
Work item: Monitoring and control facilities
11
Provide a summary of monitoringand control facilities installed,
,
and reference all reports and documents pertaining to the
description, installation, sampling, etc. , of these facilities.
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(B), A topographic map.
1. Pre-landfill and post-excavation topography.
2. Current topography.
3, Proposed final grading.
Discussion: The closure plan. requires final contours on the
closed landfill (Authority: Title 14, Section 17776. Final
„ i Grading, proposed revisions 1/89. ) . and contours every 5 years
ri thereafter through the postclosure maintenance period. Also
required are preexisting contours before the landfill was
installed to be used for estimating total volume of waste.
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• City of Redding Attachment A .�
March 29, 1989 Page 5 of 18
Work item: Prepare existing ground-surface contours
CH2M Hill has been contacted and responded with a proposal to
provide the following work:
a. Set 2 permanent monuments
b. Provide .ground-surface contours on the landfill and
adjacent margins; contour details and final product to include:
(1) Map scale, 1 inch equals 100 feet; contour
interval 2 feet.
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(2) Map provided in 2 sheets.
(3) Horizontal and vertical control provided on
11 observation wells; horizontal control provided on gas well.
(4) Detail emphasis on drainage features.
(5) Inked mylar reproducible and screened mylar
reproducible.
Work item: Final grading
Show a final grading plan to serve the following functions; an
engineering analysis will be made of each function:
Prevention of ponding
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Reduction of runoff velocities
Grades that are designed to be constructed greater than 10
percent will be designed to prevent erosion and provide slope
protection.
The specific slope configuration and drainage methods will be
design using local topography, climate, and future land use of
a the site.
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City of Redding Attthment A
March 29, 1989 Page 6 of 18
Volumetric measurements of the final ,site configuration will be
made to determine anticipated differential settlement of the
fl' landfill.
Work item: Pre-landfill contours
Using an old topographic map as a base, prepare contours on the
canyon prior to its use as a landfill. Contours will be drawn at
the same scale as the present contours (1 inch = 100 feet) , and
lines of equal waste thickness prepared to determine volume of
waste in place.
(C) Estimate of maximum extent of landfill during
its entire active life.
Work item: Extent of landfill
Show extent of landfill boundary on map.
(D) Description of current monitoring and control
systems.
Work item: see Item (b) (3) (A) above
(E) Adescription of the current land uses within 1
mile of the permitted area.
Work item: Land use
Reproduce land use maps and descriptions prepared for Calderon
Q. SWAT Report and Calderon Air report.
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411
• City of Redding S Attachment A
March 29, 1989 Page 7 of 18
(F) Estimate of the closure date based on volumetric
calculations and settlement.
Work item: Closure data
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Determine when landfill will reach capacity and when the City
will start closure work.
The date of landfill capacity will be determined either
arbitrarily, as determined by the City, or by estimating remaining
volume and daily-loading rate.
Remaining volume will be estimated using the new topography to be
prepared and estimated closure contours. The City will provide
data on daily-loading rates.
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(G) A general description of the methods, procedures,
and processes that will be used to implement closure, including
the personnel, equipment, and materials necessary for each aspect
of closure, including:
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1. Removal of facility structures (Sec. 17771) .
Work item: Removal of structures
Working with City personnel, prepare a statement as to work to be
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accomplished in the removal of facility structures.
2. Decommissioning of environmental controls
it (Sec. 17772) .
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Work item: None anticipated.
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City of Redding Attachment A
March 29, 1989 Page 8 of 18
2, Providing site security (Sec. 17767) .,
Work item: Site security
Working with City personnel, prepare a statement as to work to be
accomplished to provide site security.
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4 . Placement of final cover (Sec. 17773) .
Discussion: Final cover will be evaluated in terms of using the
existing foundation layer for the final cover. This approach
does not consider the existing requirements of the WMB and the
Regional Board for a multilayered cover consisting of a
foundation layer, an impervious layer or clay boundary, and a
soil layer.
The approach will be to evaluate the existing foundation layer in
terms of its adequacy to meet minimum infiltration from rainfall,
durability against cracking, adequacy for growing vegetative
cover, resistance to erosion, etc.
The principal method for evaluating the above will be through use
of the hydrologic model "HELP. " In order to show adequacy of the
existing foundation as a final cover, it will be necessary to
make model runs comparing the results of a theoretical
multilayered cover with the existing cover. To do this, certain
layer thicknesses and permeabilities would be assumed for a
foundation layer compacted to maximum density, a clay
barrier,and/or a soil cover.
In addition to the above, reference to other papers dealing with
the practicality (or short comings) of various landfill cover
designs would be made to support the cause for using the existing
cover as a final cover.
Finally, a case would be discussed for the long-term where
changing the cover would not necessarily result in changes to the
nj existing saturated condition of the landfill, and even if
Si saturation continued, there is presently no toxic contamination,
411
. City of Redding Attachment A
March 29, 1989 Page 9 of 18
and, it is presumed at this time, this condition would not be
yy expected to change.
Work item: Hydrologic budget model
A hydrologic budget will be run on the configuration of the
completed landfill using the HELP model. Requirements for input
data to the model include,
Field permeability test
Conduct 3 field permeability tests of existing cover material.
Permeability tests to be of the "double-ring" infiltrometer type
consisting of an inner ring of 24-inch diameter or greater, and an
outer ring of 48-inch diameter or greater. Tests to be conducted
for 3 days (72 hours) or longer, or until a steady-state
1 infiltration rate has been achieved. F
Field and laboratory soil tests
Conduct the following tests at the sites of the permeability
tests (3 sites) and at 2 other sites throughout the landfill:
a. 5, 12-inch-diameter hole sand-cone density tests
conducted in the field.
b. At the above sites, take large representative sample for
determining percent aggregate greater than 3/4-inch size.
c. In the laboratory, run compaction curves on the minus
3/4-inch size and determine in-place density and percent
compaction at each of the 5 sand-cone test sites (the large
samples provide the percent plus 3/4-inch aggregate that is
used to determine in-place density from the 12-inch-diameter
hole sand-cone test) .
d. From samples taken at the 5 sites of the sand-cone
density tests, conduct in the laboratory:.
(1) Coarse sieve analyses.
(2) Atterberg limits.
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' City of Redding S Attachment A
! ! March 29, 1989 Page 10 of 18
(3) Sieve analyses on minus 3/4-inch size and
hydrometer tests (ASTM D422) .
Work item: Evaluation of cover designs
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Review, document, and comment on other investigators evaluations
of cover designs.
Work item: Impacts of cover on existing ground-water conditions
Evaluate the impacts of the existing cover and the multilayered
! cover on the ground-water regime underlying the landfill. The
evaluation would be related to both degree of
g ground-water
saturation and quality, and to an evaluation of ground-water
recharge that occurs as subsurface flow to the landfill.
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5. Final grading (Sec. 17776) .
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Discussion: See Item (b) (3) (B) above
6. Final site face and slope-stability report
(Sec. 17777) .
Discussion: The closurelan requires quires a slope-stability analysis
to be performed on final closure slopes (Authority: Title 14.
Section 17777, Final Site Face, proposed revisions 1/89. ) . Also
required is an analysis of slopes, soil, and climatic conditions
affecting erosion of final slopes.
Y Work item: Slope-stabilityanalysis
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Provide a slope-stability analysis for slopes steeper than 3 to
1. The analysis must indicate a factor of safety for the
critical slope of at least 1.5 under dynamic conditions. The
{ report will include, but is not limited to:
(1) Review of major earthquakes during historic time.
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City of Redding At acbment A
March 29, 1989 Page 11 of 18
(2) Location of major faults.
(3) Surface investigation of the facility and surrounding
area.
(4) The location of the critical slope and other slopes
analyzed to determine the critical slope will be shown in map
view.
(5) Delineation of the critical slope showing various
layers, saturated level, and structural features.
(6) Engineering properties of the refuse and other layers
making up the landfill, analyzed for the critical slope. These
properties shall include a site-specific assessment of the
strength parameters and the unit weight.
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(7) The maximum expected horizontal acceleration in rock at
the site determined for the Maximum Probable Earthquake (MPE) , or
from the Maximum Credible Earthquake (MCE) .
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7. Installation of drainage (Sec. 17778) .
Discussion: The Closure Plan calls for a drainage system which
shall be designed, constructed, graded, and maintained to
minimize infiltration, protect against erosion of the final cover
to prevent the washout of waste, and
prevent inundation. This
system shall function to divert run-on and run-off to preclude
infiltration, thus minimizing leachate generation.
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Work item: Drainage
jl A drainage plan will be developed based on the closure contours.
The closure contours may differ from the topographic contours on
the existing landfill if it is found necessary to either steepen
or flatten grades to facilitate drainage. The final drainage
and grading plan will be a product of not only surface-drainage
NI considerations but data derived from the HELP model.
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City of Redding Attachment A
March 29, 1989 Page 12 of 18
Drainage facilities for both run-on and runoff will be sized to
accommodate a 100-year storm event.
Drainage facilities to be shown will be conceptual, that is,
runoff quantities will be generated for specific and defined
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drainage areas, and sizes of conveyance facilities will be
determined, but the plan will not include construction drawings
for implementation. Should the overall plan be approved by the
1l LEA and other required authorities, the conceptual plan will have
to be converted to a designplan bya registered
g civil engineer.
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8. Slope protection and erosion control (Sec.
17779) .
Discussion: The Closure Plan calls for the operator to develop
and implement procedures to protect the integrity of the final
cover and enhance its ability to resist erosion and minimize soil
erosion from disturbed areas on-site. The following work items
address specifics requirements p called for in the Plan.
Work item: Vegetative cover
Consult with the local Soil Conservation Service and other
sources of information to determine the best vegetative cover for
the landfill under local climatic and use conditions considering
the following:
(1) Rooting depth.
(2) Tolerance to soil conditions and landfill gas.
(3) Resistance to fire, insects, diseases and other pests.
(4) Adaptability to climate.
(5) Rapid germination and development.
(6) Self-propagating and persistence.
(7) Percentage of surface cover.
(8) Low long-term maintenance needs.
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City of Redding AttQhment A
March 29, 1989 Page 13 of 18
Work item: Soil loss •
In accordance with requirements of the plan, conduct a runoff
analysis for sheet and rill erosion to predict the amount of soil
loss (tons/acre/year) based on but not limited to the following:
(1) Rainfall-erosivity.
(2) Land use.
(3) Soil-erodibility.
(4) Length and steepness of slope.
The erosion study will use the method of the Universal Soil Loss
Equation developed by the SCS for estimating sheet and rill
erosion.
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9. Installation of leachate control (Sec. 17781) .
Work item: None anticipated
ll10. Installation of ground-water monitoring
network (Sec. 17782) .
Authority: Title 14 (proposed sections) .
Section 17716, Purpose and Goals
17717, Monitoring Network Design
17718, Construction of Monitoring Wells
17719, Chemical Parameters
17720, Detection Monitoring (Phase 11
17721, Verification (Phase II)
17722, Sampling Period
17723. Reporting 1.
.1 17724 (shown as 17721 in Guidelines) , Assessment
p; 17725, Ground-Water Quality Assurance/Quality
Control (QA/QC) Procedures
Discussion: The Guidelines state, "ground water shall be
monitored by the operator to ensure the protection of human
health and the environment. These monitoring requirements are
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City of Redding Attachment A
March 29, 1989 Page 14 of 18
not intended to conflict with those .;required by the Regional
Boards. The Board and the Local Enforcement Agency shall
coordinate actions relating to the monitoring of ground water
with the Regional Board. "
YI In view of the above, it is presumed that the existing ground-
water monitoring program installed under Subchapter 15 (Title 23)
and. Calderon Act work will satisfy the requirements of the WMB,
and that any monitoring being done under Waste Discharge
Requirements set by the Regional Board are adequate at this time.
Work item: Ground-water monitoring
Prepare a statement of the monitoring requirements presently
in effect under Waste Discharge Requirements set by the Regional
Board, and how the monitoring requirements are being conducted
(e.g. , City of Redding doing their own monitoring; name of
laboratory doing the analyses; type of QA/QC program in effect;
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method of sampling, etc) .
11. Installation of gas-monitoring and control +.
systems (Sec. 17783) .
Discussion: The Closure Plan calls (Authority: Title 14 . Section
17705. Gas Control, proposed revisions 1189. ) for a comprehensive
gas-monitoring system, and a gas reduction/mitigation system to
be designed by registered civil or mechanical engineer. Because
the Calderon Swat Air work has been approved by the local Air
Resources Control Board, and presently is being conducted, it is
presumed the present study will suffice to meet Title 14
monitoring requirements.
On the other hand, the
present air study was not implemented to
define conditions for constructing a gas-removal system, but was
4i installed to evaluate the presence and concentration of gas
within and adjacent to the landfill. The data being collected
would only be partially useful in the design of a gas-control
system. Therefore, as part of this scope of work, it is proposed
that, (1) data from the existing gas-monitoring system be
analyzed and/or collected in terms of gas-control, and (2) a work
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• City of Redding AtQchment A
, i March 29, 1989 Page 15 of 18
plan be developed to gather additional data for designing a gas
control system.
Work item: Gas monitoring and control
Evaluation of existing gas-monitoring system
Install plumbing, including valves, on all of the existing
landfill gas wells for shutting-in pressure, and for recording
gas pressure in each of the wells.
Evaluate gas pressures recorded together with known gas
concentrations, and determine adequacy of data for designing a
gas-control system.
Recommend additional monitoring devices and procedures for
designing a gas-control system
Gas pressures observed in existing gas wells and in additional
monitoring wells would provide lines of equal gas pressure
throughout the landfill, and in turn indicate the direction of
gas movement/migration. At this point, any gas-control system is
envisioned to be passive, that is a relief system using natural
pressure gradients within the soil to move the gas to the
venting system.
As stated in Proposed Section 17705:
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"Concentration of methane gas migrating from the landfill
must not exceed 25% of the lower explosive limit within
facility or adjacent structures, and
the concentration of methane gas migrating from the landfill
must not exceed 100% of the lower explosive limit at or
beyond the facility property boundary. "
A work plan would be developed that would provide data for the
design and control of a gas-control system if the above
gas concentrations were encountered.
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• City of Redding Attachment A
March 29, 1989 Page 16 of 18
(H), Closure cost estimate
Discussion: Closure costs have to be estimated for the closure
plan being submitted. The closure cost estimate submitted to the
LEA will have to be updated to be compatible with the Closure
Plan being submitted.
' Work item: Closure-cost estimate
°G l
1111 Using the closure-cost spreadsheet model obtained from the WMB,
and incorporating other models prepared by L&A for determining
cover volumes, prepare a closure cost estimate reflective of the
proposed Closure Plan.
COST ESTIMATE
Direct labor
Item Units Qty $/Unit Total $
Facilities map and adjacent land use Hr 4 50. 00 200. 00
Topographic map
Prepare contour map (see outside services)
Construct closure contours Hr 24 50. 00 1200. 00
Hr 4 70. 00 280. 00
Construct pre-landfill contours Hr 8 70.00 560. 00
Determine volume of in-place waste Hr 16 50. 00 800. 00
Extent of landfill
Hr 2 70A00 140. 00
Current monitoring and control systems Hr 4 70. 00 280. 00
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Estimate closure date Hr 4 70. 00 280. 00
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Removal of facilities structures Hr 4 70. 00 280. 00
Decommissioning of environmental
controls Hr 2 70.00 140. 00
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Provide site security Hr 4 70.00 280. 00
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1
City of Redding I AtQ2mnent A
March 29, 1989 Page 17 of 18
Direct labor (continued)
Item Units Qty $/Unit Total $
Placement of final cover
Hydrologic budget model
Field permeability test
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Apparatus and datalogger Day 15 100. 00 1500. 00
Installation Hr 12 50. 00 600. 00
Hr 8 70. 00 560. 00
Field conducting Hr 60 35.00 2100. 00
Hr 8 50. 00 400. 00
Data interpretation Hr 32 50.00 1600. 00
Hr 8 70.00 560.00
HELP model programming and
alternative runs Hr 40 50. 00 2000. 00
Hr 50 70.00 3500. 00
Evaluation of cover designs Hr 32 70. 00 2240. 00
Final grading
Site face and slope stability Hr 50 50. 00 2500. 00
Hr 8 70. 00 560. 00
Sizing of drainage facilities Hr 40 50: 00 2000. 00
Hr 8 70.00 560. 00
Slope protection and erosion control
Vegetative cover Hr 16 50.00 800. 00
Soil loss Hr 32 50. 00 1600.00
Hr 4 70. 00 280. 00
Installation of leachate control Hr 0
Ground-water monitoring Hr 8 70.00 560. 00
� ! Gas monitoring and control system
Evaluation of existing
gas-monitoring system Hr 16 50.00 800. 00
Hr 8 70.00 560. 00
BI'
1 City of Redding W ' Attachment A
March 29, 1989 Page 18 of 18
Direct labor (continued)
Item Units Qty $/Unit Total $
Additional monitoring requirements Hr 16 70.00 1120. 00
Closure cost estimate Hr 40 50.00 2000.00
Subtotal labor $32,840. 00
Outside services
Contour map (see attached letter from CH2M Hill) 7400.00
Field and lab soil tests
Coarse sieve Ea 5 34.50 172.50
!il Maximum density curve Ea 5 105.00 525. 00
In-place sand-cone density Ea 5 200.00 1000. 00
Fine gradation + hydrometer Ea 5 97.75 488.75
Atterberg limits Ea 5 76.00 380. 00
2566.25
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Subtotal outside services 9966.25
15 percent handling 1494.94
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$11,461. 19
Subtotal labor plus outside services $44,301. 19
10 Percent contingency 4430. 12
Total labor and outside services
,If $48,731.31
Note: Contingency to cover mileage, reproduction, miscellaneous
materials cost, and contingency in estimating
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• Attachment B
LAWRENCE & ASSOCIATES
Engineering Geologists • Ground-water Hydrologists
2001 MARKET ST.,RM. 523
REDDING,CALIFORNIA 96001
TELEPHONE(916) 244-9703 DAVID A. LAWRENCE,C.E.G.618
SCHEDULE OF FEES
off: Consulting Services
Engineering Geologist/Hydrologist
Principal (Registered) $70/hour
Associate� . 50 Assistant 45
Civil Engineer (Registered) 55
Technical and Secretarial 35
Deposition and Court Appearance
Minimum charge $900/part or full day
Preparation at consulting-service rates as listed above
Drilling Services (CME 55 Drilling Rig)
7-5/8 OD augers with operator and helper $135/hour
9-5/8 OD augers with operator and helper 150/hour
Mobilization 135/hour
Other Equipment Provided With Professional Services
Test Pumps (submersible)
Up to 2 HP $50/day
3 to 5 HP 70/day
Note: Daily rate for pumps includes wire and drop
pipe to 100 feet, control box, and flow meter (add
$1/ft/day for pumping depths in excess of 100 feet)
Other Equipment at quoted prices
Campbell 21X Datalogger w/ transducer(s) , •
conductivity and temperature probes
Meteorological station (wind direction and wind speed)
Gas-extraction and air-monitoring pumps
Expenses, Materials, Outside Services
Mileage (other than drill rig) $0. 25/mile
Mileage (drill rig) 0. 50/mile
Per diem 45/day
Reproduction, travel, other direct job related,
rental equipment, materials, subcontracted
labor and equipment at cost + 15%
1/1/89
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