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i <br /> Iperformed during vet weather, ve reco�mnend tha[ critical surfaces such as <br /> subgrades in building areas be covered vith asphalt-trea[ed base (�1T8) or a <br /> � gravel pad to protect the e�posed soils from dis[urbance. <br /> Excava[ions: We anticipate that a rela[ively deep excava[ion may be <br /> ( required for construction of the new spillway for the earth dam which impounds <br /> Ithe existing manmade lake. Gxcavationc will also be ri�quired Eor [he Phase 2 <br /> building. However, these building excavations are expected to be shallow as <br /> I [he adjacent ground surface will be graded to about the same level as Che <br /> Uuilding slab. <br /> � De[ailed information regarding the configura[ion of [he new spillway is <br /> not available a[ [his time an�' only limi[ed g�otechnical commen[s c:in be made <br /> I regarding construction of the spillway. The large quan[ity of wa[er re[ained <br /> in the manmade lake is the major factor which could affect spillway construc- <br /> � tion. As indicated Uy the results of Boring 4, [he fill ma[erials which make <br /> up Che exis[ing earth dam appear [o be reasonably competent. RelaCively <br /> steeply sloped open cuts should be [easible in these embmikment materials pro- <br /> Ividing [hat water from the nanmade lake is adequa[ely handled. Considera[ion <br /> should be given to lowering the water level in the lake as much as possible <br /> I to reduce potential impacts on spillway const[uction. <br /> ( Seepage irom perched ground water zones may be encountered in some exca- <br /> I vations. We anticipa[e tha[ thi.s seepage can be handled by installing [ert�- <br /> purary drainage ditches ai�d sumps within the excavations and pumping from <br /> I [hese sumps as necessary. In addition, a system oE swales and drainage ditches <br /> should be installed around the perimeter of [he excavation to intercept sur- <br /> face runoff. <br /> IS[ruc[ural Fill: All new fill in settlement-sensitive areas (i.e. , <br /> building, roadway and parking areas, and earth di.kes) should be placed as <br /> Icompacted structural fill afcer the exposed soils have been prepared as <br /> described above. We recoimcend that the fill be placed i.n horizontal lifts <br /> � not exceeding 10 inches In loose [hLckness and mechanically compacted to [he <br /> � criteria presented in Table l. The moisture content of the fill ma[erial <br /> should be adjusted as necessary to achieve [he reGuired degree of compaction. <br /> � <br /> _ (� - <br /> GeoEngineers <br /> Incorporated <br />