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Engineering + <br />p Bs Environmental <br />December 10, 2009 <br />City of Eugene. <br />Attn: Matt Rodrigues <br />244 East Broadway <br />Eugene, OR 97401 <br />Via Email: Matt.J.Rodrigues@ci.eugene.or.us <br />City of Eugene <br />Amendment One <br />Exhibit A-Scope <br />Re: Proposed.Amendment for a Geophysical Survey and Soil Sampling at <br />13th Avenue and High Street, Eugene, OR <br />City Project Number 4664; Key Number 16866 <br />PBS Proposal No. 51646.001 <br />Dear Mr. Rodrigues: <br />Contract #2010-00220 <br />of Work & Cost Estilpate <br />PBS Engineering + Environmental (PBS) is pleased to submit this proposal to conduct a geophysical survey and <br />possible soil sampling near the intersection of 1.3th Avenue and High Street in Eugene. Task 11& a. proposed <br />geophysical survey and is intended to evaluate the potential that historic underground fuel storage tanks remain in <br />place under the roadway. Task 2 is a proposed °shallow sarrtpling to identify,potential soil contamination, which. <br />may affect the :project. The following scope of services :and compensation are based.on PBS' .understanding of <br />current struptures, site conditions, and usage. <br />PROJECT APPROACH <br />Task 1 <br />PBS proposes to contract Northwest Geophysical Associates to conduct a ground=truth,geophysical survey at a <br />portion of 13th Avenue where underground storage tanks were mapped in 1925. Although the accuracy of the <br />,:geophysical survey is limited by on-site conditions that are beyond anyones control, the survey is intended to <br />identify if subsurface anomalies indicative of underground tanks in this area. At the present time, Northwest <br />Geophysical Associates plans to. survey an area that covers approximately 1500 square feet where the historic <br />tanks were mapped. The geophysical:.survey instruments that may be utilized. include a field magnetometer <br />(MAG), a conductivity instrument (EM), and ground-penetrating radar (GPR), It is anticipated-that only one or two <br />of these instruments will be required to identify these historic underground storage tanks. <br />PBS will develop a traffic eontrot plan for the fieldwork to conduct fhe.geophysical: uniey including appropriate ` <br />signs, cones, and flaggers if needed. PBS assumes that-the City will turn the signal off 0 work is indicated to take <br />place in the intersection. A preliminary review of available historic data indicates that the tanks are not likely to be <br />in the intersection, however, the exact location of the tanks is unknown. <br />PBS will coordinate with the geophysical survey contractor and coordinate necessary field activities. A brief letter- <br />style report will evaluate the findings of the geophysical survey. <br />Task 2 <br />If a tank is discovered in the project excavation area during Task 1, PBS will retain a drilling subcontractor and <br />install up to 4 temporary borings using a direct push Geoprobe® drill rig. PBS will collect up to eight soil samples <br />Bend I Boise' Coquille ( Eugene Portland Seattle Tri-Cities' Vancouver <br />2645 Willamette Street, Suite A, Eugene OR 97405 <br />541.686.8684 Main <br />541.686.4602 Fax <br />www.pbsenv.com <br />