4003 NASSAU PL 2016-01-01 MF Import

I ' , ' ' CJ � �1 Geptechnical Engineering Report Kvemmo Single-Family Residence 4003 Nuseu Place, Everett September 17, 2002 NciA File No. 356102 Page 14 Subsurface Dninage: Should ground water seepage be encountered or excessive rainfall occur during construction, we rccommend that the convactor slope ihe bottom of the excavation and direct the water to ditches and small sump pits. The water can then be pumped to a suitable discharge point. We recommend the use of footing drains around the structure and behind retaining walls. Footing drains should be installed at least 1 foot below planned finished floor elevation. The drains should consist of a minimum 4-inch-diameter, rigid, slotted or perforated, PVC pipe surrounded by free-dreining material wrapped in a filter fabric. We recommend that the free-draining material consist of an 18-inch-wide zone of clean (less than 3 percent fines), granular material placed along the back of the wall. Pea gravel is an acceptable drain material or drainage composite may also be used instead. The free-draining material should extend up the wall to 1 foot below the finished surface. The top foot of soil should consist of impertneable soil placed over plastic sheeting or building paper to minimize surface water or fincs migration into the footing drain. Footing drains should discharge into tightlines leading to an appropriate collection and discharge point with convenient cleanouts to prolong the useful life of the drains. Roof drains should not be connected to wall or footing drains. USE OF THIS REPORT NGA has prepared this report for Mr. Jon Kvemmo and his agents for ��sc in the planning and design of the single-family residence planned wi•` in this site only. The scorc of our work dces not include services related to construction safety precautions and our recommendations are not intended to direct the contractors' methods, techniques, sequences, or procedures, except as specifically described in our report f'or consideration in design. There are possiole variations in subsurface conditions betwan the explorations and also with time. Our report, conclusions, and interpretations should not be consWed as a warranry of subsurface conditions. A contingency for unanticipated conditions should be included in the budget and schedule. We recommend that NGA be retained to provide monitori�g and consultation services during conswction to confirm that the conditions encountered are consistent with those indicated by the explorations, to provide recommendations for design changes should the conditions revealed during the work differ from those anticipated, and to evaluate wherher or not earthwork and foundation installation NELSON GEOTECHNICAL ASSOCIATES, INC. 15 � I