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HomeMy WebLinkAboutPermit Building 2000-04-27--- I tt r I fiUot'tt[motl lrt-'l.Tonruiaun Engineering . Consulting e Testing AprilZ7,2000 Mr. Brian Taylor Brian Taylor Construction 23 l8 North 32nd Street Springfield, Oregon 97 477 Subject:Pad Complction Letter Ambleside-Meadsrys, l,at # 24 Springfield, Oregon 7L ss rlL Dear Mr. Taylor: Professional Service Industries, Inc. (PSI) has completed a house pad subgrade evaluation at the above referenced lot. The foundation subgrade soils within the house pad area were visually classified as orangish brown to gray clayey sand with weathered bedrock. The house pad area was probed with a % inch diameter soil probe and appeared firm at the time of our site visit. Moisture content tests were taken at various locations throughout the house pad. The moisture contents tested were approximately 28 percent. Based on previous testing performed on the soil type, the moisture content test taken is acceptable for this type of potentially expansive soil. The contractor then placed approximately 4 inches of crushed aggregate, granular fill over the house pad area to achieve final grade and compact the material. The crushed aggregate, granular fill visually appeared to be well compacted at the time of our site visit. Additionally, we recommend that finished grade adjacent to the exterior portion of the footings and slabs be at least 2 feet higher than the expansive bearing soils. This is to provide a buffer from environmental changes that could cause the expansive soils to dry and hydrate. It will be imperative that the 2-foot buffer of landscape soil be compacted to a firm condition to reduce the infiltration of water at the surface. During foundation construction, water should not be allowed to collect in foundation excavations, on floor slab areas, or on prepared subgrades of the construction area either during or after construction. Undercut or excavated areas should be sloped toward one corner to facilitate removal of any collected rainwater, groundwater, or surface runoff. Positive site drainage and foundation drains should be provided to reduce infiltration of surface water around the perimeter of the house and beneath the floor slabs. The permanent grades should be significantly sloped away from the house building areas and surface drainage should be collected and discharged such that water is not permitted to infiltrate the backfill and floor slab areas ofthe residence. Professional Service lndustries, lnc. . t040A Shelley St. . Springfield, OR 97477 . Phone 541146-9649 . Fax 5411746-7163 lz lorit27, z66s 'age2 All crawl spaces should be provided with a low-point crawl space drain connected to the storrn sewer or aiproved disposal system (outlet). All areas of the crawl space should be graded to drain to thi iow-point drain. All crawl space areas should be covered with a visqueen moisture barrier. The lowlpoint drain should be lower than the elevation of the visqueen moisture barrier. Based upon our observations, the house pad subgrade appeals- to have been constructed in general accordance with industry standards foi tigtrtty toaded lr,ooo. pounds per square foot or less) foundation loads typical"for this type of cJnstruction. If you have any questions regarding this report, please feel free to contact us at746-9649' RespectfullY Submitted, PNOTT,SSTbNAL SERVICE INDUSTRIES, INC 4"r^ lr,A 19206PE M EXPIRE$:6i30 _ll-- Troy Hull, P.E. Project EngineerBrian Currier, E.I.T Staff Engineer OREGON 51