HomeMy WebLinkAbout14- Amendment No. 1 to Professional Services Agreement, Story Mill Landfill CMA Amendment No. 1 to Professional Services Agreement
Story Mill Landfill CMA
THIS AGREEMENT is made as of this 7th day of July, 2014, between THE CITY OF
BOZEMAN, a Municipal Corporation, Bozeman, Montana, herein referred to as OWNER and
Tetra Tech Inc, an Engineering Consulting Firm of Helena, Montana, herein referred to as
ENGINEER.
WHEREAS,the parties have entered into a Professional Services Agreement dated May
29, 2014, herein referred to as Original Agreement for professional engineering services; and
WHEREAS,the parties desire to further amend the provisions of this Agreement.
NOW, THEREFORE, IN CONSIDERATION OF THE MUTUAL COVENANTS
CONTAINED HEREIN, the parties agree as follows:
The initial scope of work will be modified as described below:
Basic Data Collection
We propose to collect a number of initial data sets to be able to more fully understand the extent of the
problem and to better select and design remediation components. Our initial data collection will include
the following:
1. Installing and sampling three Soil Gas Probes along the south boundary for the purpose of determining
if there are deeper strata where soil vapor may be migrating.
2.Installing two SVE wells along the south boundary and conducting tests to estimate a radius of
influence for those wells.
3.Completing a detailed topographic survey of the landfill and surrounding area.
Previously, we had proposed also to complete a surface emissions sweep and,as noted above,to install an
interim or extended pilot test system. Neither of these steps is particularly compatible with the 90-day
schedule for completion of a Draft CMA. We also previously proposed to install a Landfill Gas Well in
the lined cell and evaluate the potential for gas migration from the lined cell. We understand it is the
City's preference to avoid this step. The schedule for completing tasks 1-3 above and the interaction of
data from these tasks with the CMA is described subsequently in this letter.
CMA Report
The preparation of the CMA report will begin immediately to meet the 90-day schedule. Figure 1 shows the
proposed schedule. We will begin with the Problem Definition. We will rely on existing data primarily to do this
but,as data from our base data collection efforts becomes available, we will use that as well. One potential
issue with the problem definition is defining the extent of the off-site contamination. There are some relatively
large holes in the monitoring network down gradient of monitoring well MW-20. We assume that DEQ is aware
of this and is aware also that the 90-day limit that they have imposed will essentially prevent further delineation
of the plume. It is possible that they view the prevention of further migration from the Landfill as a higher
priority than chasing existing contamination.
Also beginning almost immediately will be the identification and screening of alternatives. We previously
identified likely alternatives some of which were analyzed in the 1995 CMA.
Although it is relatively early to do so,we will also begin writing the CMA report.We'll have to leave some
`blanks' of course until the base data collection is completed and the remainder of the CMA process is
completed but to meet the 90-day schedule, we will start writing immediately. We plan to rely on the
organization and some of the existing sections in the 1995 CMA report.
By mid-July, we will begin the detailed analysis of alternatives including cost estimates and effectiveness. Since
the pilot test data and site specific data will not be available for cost estimating,generic cost estimates from EPA
documents,Means Cost Estimated Guides,and other standard sources will be used. By mid to late July, we
would begin the comparative analysis and selection of the remedy. By the week of August 18, we expect to
issue a Draft CMA for the City's review. Allowing about 5 business days for the City's review and another 2
business days for us to incorporate any comments you might have, will allow us to submit the Draft CMA on
August 27 inside the 90-day limit.
The basic data collection efforts described above will be conducted concurrently with CMA Report Preparation
as shown in Figure 1. As new data from these efforts becomes available,we will incorporate them into the
CMA Report as necessary. All of the basic data collection efforts should be complete by early August in time to
be incorporated into the August 27 version of the Draft CMA report.
Once the Draft CMA is in DEQ's hands for review and approval,the anticipated schedule becomes more
tentative. It is possible that by the second week of October,DEQ will issue comments on the Draft CMA. We
would begin addressing their comments and implementing the recommended solution. Assuming that the
recommended solution would involve a significant amount of drilling(for SVE wells or landfill gas extraction
wells for example), we could easily install these portions of the system within 90 days after DEQ's review.
Other portions of above-ground components in the selected remedy (which might include buried gas collection
piping, gas combustion, activated carbon gas treatment or a groundwater treatment system or other components)
might be more difficult to complete at that time of year.
Revised Budget
Based on the scope and schedule described above,I have estimated a new budget to complete the project
through the step of issuing the Draft CMA to the DEQ. To complete this estimate, I revised the estimate that we
previously provided to you by taking out all costs related to the surface sweep, drilling and analysis of the lined
cell, and reporting to describe a new conceptual model. Additionally, I reduced hours for team members in
recognition of the fact that we will be proceeding with the CMA based more on the use and analysis of existing
data(including the 1995 CMA) and standard cost estimating tools instead of site specific estimates that are
based on new data that might have been obtained from field data collection efforts or the proposed interim or
extended pilot test system. Attachment A contains the new budget estimate. Its total is$221,339.
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ATTACHMENT A
SUMMARY
REVISED ESTIMATED BUDGET FOR CORRECTIVE MEASURES ASSESSMENT
STORY MILL LANDFILL CLASS Il/LICENSE#196
BOZEMAN,MONTANA
June 13,2014
TASK 100 PREPARE UPDATED SITE CONCEPTUAL MODEL $49,376.82
TASK 200 CONDUCT SOIL VAPOR EXTRACTION PILOT TEST $85,549.17
TASK 300 OPTIMIZE LANDFILL GAS EXTRACTION SYSTEM $43,336.80
TASK 400 CORRECTIVE MEASURES ASSESSMENT DOCUMENT $43,076.00
TOTAL. $221,338.79
Figure 1
Revised Schedule for Bozeman Landfill CMA
0 /esk Same -c
/ August September
5/15 yn6/1 E18 6/15 6/22 6hO 7/6 7/13 7/20 /12/ 8/f 9/10 8/17 8/20 8/11 9/7 9/14
1 Recerve 90 day CMA letter _ M
1 Preparation of CMA Ir
1 Problem GetPLon -_ -- -- —
e <dentificatlen and Screening of Alternatives •
5 Deveiopteent and DeScrrpnon of RPmedal �{.__. ..__....._
ARernabves _
6 Detailed AslaMrs of Alternatives
•
Comparative Analysls/$ela coon of Remedy _ 'a me nt
g CMA Draft Report Peeparanon
9 Issue Draft CMA for renew ��
l0 Crty of Bozeman Review __ ____ _
11 Revise Report and issue to bEQ i aT
12 DED Review/Public Meeting/Comment
13 Rause and Issue PIna1CMA
Ia Install Selected Remedy or Remedies
Is Progress Repotting
16 Progress and Review Meeting ■
1r Progress and Review Meeting •
10 Progress and Renew Meeting ■
19 Data Collection T•
ZO Install Spil Gas Probes
21 Sample Sail Gas Probes
22 So!Gas lab sample analysts 1 -
21 Install Gas E xlra[llon Wells -
04 Radots of influence test a
• 25 Cellon Base+sne Data for Emate lfG system
26 Analysis of Baseline Data ilT
at LPG system Improvements
task 110111NIMIIIMINI Pry Summary . - Imam MJestone Manual Summary Rave Deaelme i
Mina Renter/90 day stNedule Solo coma''asks sereemeammea Inactive Summary Manual Summary - - Wtgress
Date Or.6/11/1d Milestone ♦ E xlem.Milestone • Manual Task 111=11 Startanty
Summary ,I—e,Ige mails,task Duratwn-oniy Fnshonle 3
Page 1
Except as specifically amended herein, the original agreement shall remain in full force and
effect and the Parties shall be bound by all terms and conditions therein.
IN WITNESS WHEREOF, the parties hereto do make and execute this Agreement on the day
and year first above written.
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CBy: ( "7
,, City Manager
ATTEST: '�� •' -\ •,
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Stacy Ulme tJ; ;, : �' r
City Cleric � ,��•'�Q
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APPR eED . T(FORM
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By:
CIli ttorney
ENGINEER
By:
Its: ‘1\.y41Q--e\C-
ATTEST:
By:
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