7622 RAINIER DR 2016-01-01 MF Import

i � CASCADE GEOTECHNICAL June S0, 1991 Lyle Blank Job No. 9105-16G Paga 5 creek/drainaye ditch would overflow onto your site during heavy rains due to poor maintenance of the creek/drainaqe ditch in the past. it is also our undarstanding that since the City of Everett I "cleaned out" the creek/drainage ditch there has been no problem with flooding on this sitc. � We recommend raising grades within the proposed building area if t the creek/drainage ditcti is not maintained in the future in order � to prevent flooding of the site. Raising grades would also facilitate site drainTqe. If fill is placed, it shovld meet the � recommendations state:d in the etruotural Fill section of this report. I eit� PraDtiation IDue to the moisture sensitivity of the native soil and the presence I of a perched water table, we recommend that all earthwork be conducted during the dry summer months. The on-site, native soils I will deteriorate rapidly under heavy equipment if excessive moisture is present. Significant .,dditional costs and construction difficulty would be expected if earthwork occurs during wet weather ( conditions. At the time of our visit, the native soils were moist to cret. IWe reconmend the removal of all the topsoil and veqetation from the I building area prior to any construction. The topsoil noted in the test pits is unsuitable for the support of a building foundation I and slab-on-grade floor. F7e also recommend the complete removal of the existing garage from the site prior to any earthwork. IWith the presence of the perched ground water table, i': may be necessary to construct temporary drainage ditches to remove water Ifrom the proposed build9.ng area. These drainage ditches should