2205 BROADWAY 2016-01-01 MF Import

, LSI -ADAPT � SUBSURFACE CONDITIONS The soil borings generally disclose� the following untierlying soil conditions as described below: Boring SB-1,advanced outside of the proposed building footprint en the northem portion of the parcel, disclosed loose, silty fine sand that extended to a depth of about IS fe�.t below ground surface (bgs). These soils were assumed to be man-pluced fill associated with the presencr of an adjacent wderground storage tank. Borings SB-2, SB-4, and SB-G, advanced adjacent to or within the propased building footprint, disclosed stiff to hard silt interbedded with silty fine sand with variable gravel that extended to depths ranging from approximately 5 feet (SB-2 and SB-6) to the full depth explo�ed of 16%x feet in SB-3. Boring SB-5 disclosed very dense silty fine sand with variable gravel that extended the full depth explored (up to 16 % feet bgs). Boring SB-3 disclosed near surface, medium dense,silty fine sand. These upper soils horiwns were underlain in borings SB-I, SB-2, and SB-4 lo SB-6 by medium dense to very dense, moist, brown varying to gray, silty fine sand to fine to mcdium sand with variable gravel that extended the full depth explored (up to 60.5 feet bgs). GROUNDWATER CONDITIONS Wet soil condilions were observed in boring B-6 at a depth of approximately 6 feet bgs. Based upon the lack of ineasurable water in the borehole and moist underlying soil conditions, the water encountered in the exploration appeared to be "perched" atop less permeable undedying soils. The other explorations did not encounter recoverable water to depths of up to 65 feet bgs. Groundwater conditions should bc expected to tluctuate due to season, amoun[oCprecipitation, and othcr on-site and oft=site factots. RECOMMENDATIONS AND CONCWSIONS [iased on the encountered site conditions, the retail building and paved parking lot building can be supported utilizing conveniional spread footings bcaring on thc stiff or medium dense or 9enser near surface native �c�ls that are generally encountered at shallow depths across the site. Foundations may also be supported on structural fill placed above these competent native soils. Due to the relatively tlat nature of the site and proposed slab-on-grade construction, only a limited amount of site grading will be necessary. Other than an apuarcnt "perched" watcr zone cncountcred at shaliow depth in boring SB-6, shallow groundwatcr was not present at lhe site. Therefore, sWctural elements will not likely extend down to thc scasonal high watEr Icvels. The near surfacc soils cncountcred in most of our borings contain a relativcly high sill content. Thcreforc, grading and compaction would be extremcly diflicult if not impossiblc during �3�et wcatlicr conditions. LSI-ADAPT Job No.WA02-8721 PaGe/31 August6,2002