G-Logics was retained to provide a peer review of historical data to help confirm the
possible presence of soil and/or groundwater contamination along SE 8th Street in Bellevue,
Washington. This section of roadway was reconstructed in 2002 as part of the city's

"Access Downtown" program. The review confirmed the
historic presence of a wood-waste landfill that may have
contained hazardous materials.

Given concerns about both worker exposure and potential
construction delays associated with possible soil and
groundwater contamination, G-Logics provided
recommendations to further characterize the area to be
affected by the roadway upgrade. The additional
characterization work included the installation and
sampling of four groundwater-monitoring wells and a data

submittal to the Washington Department of Ecology. Identified site contaminants were
predominantly petroleum hydrocarbons. Based on these results, G-Logics requested an

opinion letter from Ecology regarding the
City's planned management of
contaminated soils and groundwater
generated during the roadway restoration
work. Ecology agreed with the planned
approach and issued the requested
opinion letter.

Prior to roadway restoration work,
G-Logics in conjunction with another
consultant prepared a turbidity monitoring
plan for the project. The plan specified
upstream and downstream turbidity
monitoring locations in Sturtevant Creek
and developed baseline turbidity

levels for Sturtevant Creek in the project work area.

Management of the excavated materials, hazard monitoring, required remedial actions, and stream monitoring were conducted during the restoration project. Baker tanks were used for temporarily storing waste water generated during the restoration work. G-Logics monitored the waste water for petroleum hydrocarbon and compliance with the City's sewer discharge turbidity requirements. As a result of regular turbidity monitoring of both the creek and waste water, the City demonstrated compliance with water quality standards throughout the roadway restoration project.