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June 13,2023 <br />HWA Project No. 2022-188-2 I <br />tipping floor. The tipping floor will be accessed by commercial and self-haulers via a wide paved <br />driveway ramp that ascends from the perimeter access road southward to the transfer station. <br />Refuse collected on the tipping floor will be directed by solid waste personnel into a top-loading <br />system situated above a series of hopper bays located along the eastern side of the structure. To <br />achieve the grade separation required to accommodate loading waste haul trailers, placement of <br />fill in excess of l6 feet high is presently envisaged. The fill placed to accommodate the haul <br />trucks will be retained using a cast-in-place (CIP) concrete retaining wall situated inside the <br />transfer station near the east side of the facility. <br />West of the transfer station a 5.07 acre composting facility will be constructed, that will likely <br />consist of a slightly sloping paved area where compost and/or topsoil is produced. South of the <br />compost facility another paved area encompassing approximately 10,000 square feet (SF) wiil <br />serve as a white goods acceptance area with adjacent tire recycling area to the east. Stormwater <br />will be collected and conveyed to detention ponds situated southwest of the recycling center and <br />in the southeast property corner. <br />1.3 Scorr oF SERVIcES AND AurnonzATroN <br />HWA undertook the geotechnical investigation in accordance with our scope of work and cost <br />estimate dated December 9, 2022, and agreement dated January 6,2023, with SCS Engineers, <br />Inc. The main tasks of our scope include: <br />o Conducting borings at the locations of the transfer station, scale facility, MRW building, <br />and composting area as depicted on the conceptual layout. <br />. Conduct a laboratory testing program to characterize site subsoils. <br />o Prepare a geotechnical report summarizing results of the field investigation, laboratory <br />testing results and will include recommendations for building and retaining wall <br />foundations, lateral earth pressures, earthworks, and pavement design. <br />. Providing one round of plan review to ensure our geotechnical recommendations are <br />incorporated. <br />2.0 FIELD EXPLORATION AND LABORATORY TESTING <br />2.1 Frnr,u Expr,onanon <br />Our subsurface investigation consisted of drilling eight borings, designated BH-1 through BH-8 <br />and were conducted on February 28 and March 1,2023. The borings were drilled by Holt <br />Drilling, Inc., of Edgewood, Washington, under subcontract to HWA, using a track-mounted <br />Diedrich D-50 drill rig equipped with hollow stem augers. The borings were drilled to depths <br />ranging from about 16.5 to 21.5 feetbelow ground surface (bgs) and were located to obtain <br />subsurface data atthe approximate location of proposed structures at the time of drilling. <br />aJ2022-188-21 KCTS - Final Geotechnical Report HWA GEOSCIENCES INC.