HWA GeoSciences Inc. 5/9/2016 - Laserfiche WebLink

April 12, 2016 HWA Project No. 2016-P044-21 GEOTECHNICAL ENGINEERINGS SERVICES • Review Available Geotechnical Information: HWA will review existing readily- available geotechnical and geologic information in the project area. This will include a review of online databases and geologic maps. • Plan Field Exploration Program: HWA shall plan an appropriate field exploration program HWA shall coordinate with local drillers to determine the best drilling equipment for each exploration, given the site constraints and exploration objectives. • Generate Field Exploration Memo: HWA shall generate a field exploration memo that outlines our proposed field exploration program. This memo will be used to convey critical information to the city for permitting and approval processes. The memo will include a narrative explaining the type, depth, location and timing of our proposed field explorations. A figure showing the locations of our proposed field explorations, laydown areas and access points will be provided. • Conduct Utility Locates: Prior to conducting our field explorations HWA will call for utility locates. In addition, HWA will also retain a private utility locating service to clear the proposed exploration locations on private property and coordinate with the owner's representative regarding utility layout • Conduct Steep Slope Reconnaissance: An HWA geologist and geotechnical engineer will conduct a one day reconnaissance of the steep slope areas to the east of the lake. This reconnaissance will include a detailed evaluation of existing slope features and the advancement of hand explorations at strategic locations to further classify the soils conditions along the slope. The approximate locations of the proposed hand borings are indicated in Figure 1.This effort will be focused on evaluating the stability of the near surface soils along the ravine in the vicinity of the bridge structure. • Conduct Subsurface Explorations: Upon approval, HWA shall conduct the proposed field exploration program, which includes a total of ten (10) borings. The approximate location of our proposed limited access machine drilled borings are indicated in Figure 1. Each of these borings will be drilled with a limited access rubber tracked bobcat mounted drill rig or a tripod mounted drill rig. Each boring will be drilled to a depth of 25 feet or 5 feet into very dense glacial soils, which ever is less. We expect that drilling these borings will take approximately 3 days to complete. Groundwater monitoring wells will be installed in three (3) of the ten (10) borings. During drilling and sampling the observed soils will be screened for visual signs or odors indicating the potential of contaminated soils. If the presence of potentially contaminated soils are observed, the samples will be collected and sent to a laboratory for analytical analysis. Any analytical HWA Scope