400 SIEVERS-DUECY BLVD 2016-01-01 MF Import

1� ' I SIiMINON bWILSON.INC. area. The field house will be a 600 square foot building housing restrooms,concessions and a � control room for lights and imgation. I 3.0 SUBSURFACE EXPLORATIONS AND CONDITIOIVS Subsurface information for the project was obtained &om two previously completed soil borings � accomplished by GeoEngineers, Ina GeoEngineers completed a geotechnical soil boring, designated B-4, and a monitoring well installation,designated MW-3,within the portion of the �' CSR landfill that will contain the proposed athletic fields. The logs of the previous bocir►gs were � � provided in their report titled"tieotechnical Engineering and Environmental Services, � ! Construction Debris Landfill Evaluallon,Everett, Washington," dated November 6, 1998. The � ' locations of the borings are shown on Figure 2. �� Soil boring B-4 was drilled and srunpled to a depth of 86.5 feet. Monitoring well M W-3 wa� drilled and sampled to a depth of 111.5 feet. Samples were obtained at five-foot intervals in[he � borings using a 3-inch outside diameter,split-barrel sanipling tube. The sampling tube was driven into the soil with a 300 pound hammer free-falling 30 inches. � It should be noted that the Standazd Penetration T�st lSP!'�consists oi d�iving a 2-inch outside diameter(O.D.)split-spoon sampler a distance of 18 �nches into the bottom of the borehole with , a 140-pound hammer falling 30 inches. The number af blows reyuired to drive the sampler each of Uvee 6-inch increments was recorded, and the n►�mber of blows required to cause the last 12 �, inches of penetration is tecmed the Standazd Penetration Resistance(N-value), This value is an indicator of the relative density and consistency of the soils. In the case of the GeoEngine:rs. ! borings, a heavier hammer and larger diameter sampling tube was used and,therofore,the penetration resistance or blow count, in blows per foot, is less than the penetration resistance ttiat Iwould be obtained if a standazd hammer and tube were used. In our opinion,the blow counC � results presented on the GeoEngineers logs should be multiplied by 1.5 in order to obtain a more � accurate"N"value based on the Standard Peneuation Test. The results of the soil borings (B-4 and M W-3)indicate that the ballfields site is undalain by 60 i to 80 feet of loose to medium dense fill materials. The fill materials generally consist of silty i fine sand and gravelly sand. The fill becomes more dense and contains frequent gravelly layers below a depth of 45 feet Below the fill the native soils generally consist of dense to very dense, ' fine to medium sand W862R-0I.rp✓wp/sjm W8628-01 2 �4