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4702 R'Glenhaven Drive CAO,Snohomish County,Washin�ton Materials Testing cC Consulting,Inc. <br /> Jul�� 3 I_201 7 1 GB030 <br /> To manage and prevent the potential for onsit� and offsite impacts, the following are recommended: <br /> • No concentrated water is to be directed towards sloped areas. <br /> • Maintain the existing buffers and setback from the slopes north of the eaisting residence. <br /> • No construction disturbance between the proposed development and the previously mentioned <br /> slopes. <br /> No structural loads shall extend within the setback limits, such as deck footings or roof support columns. <br /> Flatworks such as walkways or other surface improvements may be per-missible between the building <br /> envelope and the slope, but shoulci be evaluated on a per-case basis by a qualified professional with <br /> appropriate recommendations and design elements applied. At that time, allowance may be best <br /> considered upon accounting for the scale of impro�vements, relation to the proposed or constructed <br /> building, and specific location relative to the adjacent slope, as ��ell as local municipal requirements. <br /> Landscape plantings are typically encouraged within protective slope zones, although major landscaping <br /> projects and those involving earthwork shall be designed or reviewed by a qualified landscape architect <br /> and/or geotechnical professional as applicable. <br /> MTC does not recommend reducing the current setback distances, without reevaluation and further <br /> exploration, to ensure building and slope stability is maintained. It is preferable to increase the setback as <br /> much as possible to lessen the load near the slope and increase design life in a geologically active <br /> environment. The client should make all reasonable attempts to allow for greatzst separation from the <br /> slope crest to the majority of the structure, such as by shifting or reorienting the footprint as possible. <br /> MTC recommends that we be contacted to review proposed building and site preparation plans and <br /> specifications, to ensure they are consistent with the intent of the recommendations provided herein. In <br /> addition, MTC recommends that we be retained for construction phase testing, observation, and <br /> engineering consultation services. Such services may include but are not limited to earthwork supporrt <br /> consulting, subgrade verification, compaction testing c�f structural fills, laboratory materials analysis, and <br /> special inspections if required. We recommend structural fill placement and compaction be obseived on a <br /> full-time basis by an MTC representative. A suffici�nt number of tests shall be performed to verify <br /> compaction of each lift. <br /> Draina�e Controls <br /> MTC recommends proper drainage controls for mitigating the increased potential for stormwater runoff <br /> is implemented along with project site development to protect conditions of the slope. Where possible, <br /> c <br />