7505 SEAWAY BLVD Geotech Report 2022-10-25

November 11, 2016 HWA Project No. 2014-117-21 4.9 SOIL CONTAMINATION CONSIDERATIONS HWA conducted a Phase I environmental site assessment (ESA) in 2014 for the site, to ascertain if any likely soil or ground water contamination issues are present which may impact the project. Findings of the ESA indicate that there are no officially reported environmental issues on the site itself, and no known releases of contaminants to soil or ground water on adjoining parcels. Possible concerns include the following: 1. An adjoining electrical substation. Electrical substations are sometimes associated with PCB contamination, although no such issues are reported for this site. 2. The presence of fill soils at the site may be of concern, although the origin of the fill appears to be from adjoining land, and the fill does not exhibit any visual indications of contamination(e.g., debris, staining, odors, etc.) During HWA's geotechnical investigation, soil samples were examined for obvious evidence of potential contaminant indicators, such as odors or staining. No obvious evidence of contamination was observed in any of the geotechnical borings, therefore no environmental samples were collected. In summary, there do not appear to be significant contamination-related issues associated with site with respect to the proposed project construction. 5. CONDITIONS AND LIMITATIONS We have prepared this report for the Community Transit and Perteet Inc. for use in design of portions of this project. This report should be provided in its entirety to prospective contractors for bidding and estimating purposes; however, the conclusions and interpretations presented in this report should not be construed as our warranty of the subsurface conditions. Experience has shown that soil and ground water conditions can vary significantly over small distances. Inconsistent conditions can occur between explorations and may not be detected by a geotechnical study. If, during future site operations, subsurface conditions are encountered which vary appreciably from those described herein, HWA should be notified for review of the recommendations of this report, and revision of such if necessary. We recommend HWA be retained to review the plans and specifications to verify that our recommendations have been interpreted and implemented as intended. Sufficient geotechnical monitoring, testing, and consultation should be provided during construction to confirm the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should conditions revealed during construction differ from those anticipated, and to verify that the geotechnical aspects of construction comply with the contract plans and specifications. 2014-117 Final Geotechnical Report 16 HWA GEOSCIENCES INC.