04.13.2007 - GeoEngineers GEOENGINEER�
April 13,2007
City of Tigard.
13125 SW Hall Blvd.
Tigard,Oregon 97223
Attention: Mr. Dennis Koellermeier
Subject: Revised Proposal for Environmental Services
Tigard Library
13500 SW Hall Boulevard
Tigard,Oregon
File No. 4025-003-02
INTRODUCTION AND OBJECTIVES
This letter presents our revised proposed scope of services, schedule, and estimated budget for conducting
environmental services related to arsenic soil contamination at the Tigard Library property, located at
13500 SW Hall Boulevard, Tigard, Oregon (hereafter referred to as "site"). The objectives of the
proposed services are to: 1) refine the understanding of the extent of contamination near the southwest
and southeast corners of the site; 2)obtain chemical analytical data necessary to profile contaminated soil
for disposal at an off-site landfill facility and 3) observe and document environmental components of
planned construction activities at the planned Wall Street extension.
The general scope of services presented in this proposal was discussed during a April 10, 2007 meeting
between GeoEngineers Inc. and Ms. Vannie Nguyen and Mr.Zen Dutson.
PROPOSED SERVICES
GeoEngineers proposed services include:
SURFACE SOIL SAMPLING
1. Complete approximately eight soil explorations using hand auger equipment in 1 day between the
ground surface and anticipated depths of approximately 3 feet below ground surface (bgs).
Collect one to two soil samples from each exploration for potential analysis. Approximately four
explorations will be completed near the southwest corner of the site and approximately four
explorations will be completed near the southeast corner of the site.
2. Record the location of each sample with a sub-meter grade global positioning system(GPS)unit.
3. Submit as many as 12 soil samples for chemical testing of arsenic by U.S. Environmental
Protection Agency(EPA)Method 6020.
4. Prepare a memorandum summarizing the soil sampling activities and laboratory analytical data.
The memorandum will include a comparison of analytical data to relevant screening criteria (i.e.
DEQ Default Background Concentrations) and an updated figure showing the sample locations
relative to other site features of interest.
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April 13, 2007
Page 2
5. Prepare an addendum to GeoEngineers' April 11,2007, "Soil Management Plan, Tigard Library",
if necessary. The addendum would include revised estimates of the lateral and vertical extent of
contamination in the areas where sampling is proposed.
SOIL PROFILING FOR DISPOSAL
1. Collect three soil samples from areas of the site that have previously exhibited elevated levels of
arsenic. Mix the three samples and submit the composite sample for analysis of arsenic by EPA
toxicity characteristic leaching procedure(TCLP)method 1311/6020.
CONSTRUCTION ENVIRONMENTAL OBSERVATIONS AND MEETING
1. Attend a pre-bid meeting at the site on April 24,2007.
2. Conduct approximately five site visits during planned construction at the Wall Street extension
and adjacent areas (wetlands and swale). Site visits will be conducted to evaluate whether
construction personnel are complying with recommendations presented in GeoEngineers' April
11, 2007, "Soil Management Plan, Tigard Library". Specific tasks that GeoEngineers will
conduct during observations include: 1) assessment of the contractor's air testing protocols; 2)
comparison of air data collected by the City's contractor to OSHA standards for arsenic; 3)
documentation of the general locations and thicknesses of fill, demarcation layers,
concrete/asphalt that are placed at the site in contaminated areas and 4) review of selected
contractor's tipping receipts to confirm that contaminated soil is being disposed of at an
appropriate facility. GeoEngineers will document observations in field reports that will be
provided to the City of Tigard.
ASSUMPTIONS
For cost estimating purposes, we have made the following assumptions:
• Site access is unrestricted for field personnel.
• Hand tools(augers, shovels and trowels)will be suitable for collecting samples at the site.
• Sample analyses will be conducted under expedited(3 day)laboratory turnaround times(TAT).
• Investigation-derived waste (IDW) will not be generated during site activities. Soil cuttings will
be returned to boreholes.
• As many as five site visits will be conducted during construction activities. Site visits will be
approximately 4 hours in length.
PROJECT SCHEDULE
We understand that the City of Tigard desires that the proposed sampling and analysis be completed by
April 20, 2007. We anticipate that we can complete the sampling and present the sampling results by that
date, using expedited laboratory services. Construction activities are planned for summer 2007. We
anticipate that the proposed environmental construction observations will be completed between June and
September 2007.
PROJECT BUDGET
We propose that the professional services listed above be provided in accordance with the Services
Agreement, File No. 0615-ST06-13 (Agreement) between GeoEngineers and the City of Tigard. The
File No.4025-003-02 GEOENGINEERS-
City of Tigard
April 13,2007
Page 3
fees for the services described above will be determined on a time-and-materials not-to-exceed basis
using the rates indicated on the Exhibit 2 of the Agreement.
The estimated fees for the services outlined above are summarized below:
Task Estimated Total Fee
Soil Sampling and Reporting $2,000
Soil Analysis for Waste Profiling $125
Environmental Construction Observations and Meeting $3,500
Total $6,625
We will keep you informed of project status and advise you if it appears appropriate to modify the scope
and budget.
AUTHORIZATION
This proposal can be authorized by issuing a work order agreement under the terms and conditions of the
services agreement between the City of Tigard and GeoEngineers dated December 22,2006.
We appreciate the opportunity to present this proposal to provide services to you on this project. Please
contact us if you have any questions concerning this proposal.
Sincerely,
GeoEngineers, Inc.
Chris Breemer, R.G.
Senior Project Manager
/
Vohn H.Biggane
Principal
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PORT: P:\4\4025003\02\Finais\402500302P2.doc
c: Vannie Nguyen
Proprietary Notice: The contents of this document are proprietary to GeoEngineers,Inc.and are intended solely for use by our clients and their
design teams to evaluate GeoEngineers'capabilities and understanding of project requirements as they relate to performing the services proposed
for a specific project. Copies of this document or its contents may not be disclosed to any other parties without the written consent of
GeoEngineers.
Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any
attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official
document of record.
CopyrightO 2007 by GeoEngineers,Inc. All rights reserved.
File No.4025-003-02 GEoENGINEERS-