11632 EVERGREEN WAY BASE FILE 2018-01-01 MF Import

� �-iaas FIELD EXPLORATION PROCEDURES AND L�GS Our field exploration program for this projcct included completion of 33 borings and 21 test pits between April 28, and May I5, 2G.;3. The approximate locations of the exploiations aze presented on Figure 1, the Site and Exploration Plan. Exploration locations were determined by � measuring distances from existing site feahues with a tape relative to a Conceptual Site Plan dateJ i June 20, 2Q02, by PacLand. As such, the exploration locaGons should be considered accurate to the I degree implied by the measurement method. The following sections describe our procedures ' associated wit6 the exaloration. Descriptive logs of the explorations are enclosed in tlus appendix. Soil Boring Procedures � Our exploratory borings were advanced using truck- and small, track-mounted drill rigs I operated by an independent drilling company working under subcontract to our firm. The borings were completed utilizing hollow-stem auger methods. �a experienced engineering geologist and geotechnical engineer from our firm continuously observed the borings ]ogged the subsurface � conditions encountered, and obtained representative soil samples. All samples were stored in i moishuc-tight containers and uansported to our laboratory for further visual clessification and testing. � � Throughout the drilling operation, soil samples were obtained at 2.5-to 5-toot depth intervals i by means of thc Standard Penetration Test (ASTM: D-1586). This testing and sampling procedure I consists of driving a slandazd 2-inch outsidc diameter steel split spoon satnpler 18 inches into the soil with a 140-pound hammer free falling 3C inchcs. The number of blows required to drive the sampler Uirough each 6-inch interval is recorded, and the total number of blows struck during the final 12 inches is recorded as the Standard Peneh�ation Resistance, or"blow counP' (N value). If a total of 50 blows are sWck within any 6-inch interval, the driving is stopped and the blo�v count is recorded as 50 blows for the aceual penetration distance. The resulting Standard Panetration Resistance values indicate the rclarive density of granular soils and the relative consistency of cobesive soils. The enclosed boring logs describe tl�e vertical sequence of soils and materials encountered in � cach boring, based primarily upon our field classifications and supported by our subsequent laboratory examination and testing. Where a soil contact was observed to be pada6onal, our logs indicate the average contact depth. Where a soil type changed behveen sample intervals,we infecred the contact depth. Our logs also graphically indicate the blow count, sample type, sample number, and approximatc depth of each soil samQlc obtained from the boring, as well as any laboratory tests performed on these soil samples. If groundwatcr was encountered in a borehole, the approxunate groundwater depth, and date of observation, is depicted on the log. Groundwater depth estimates are I.ypically based on the moisture content of soit samples, the wetted portion of the drilling rods, the water levcl measured in the borehole after the auger has been extracted, or through the use of an observation well. The boring logs presented in this appendix aze based upon the drilling action, observation of the samplcs secwed,]aboratory test results,and field logs. The various lypes of sails are indicuted as well as the depth where the soils or charactcristics of the soils changed. It should be noted that these ; ,��