4801 HARBOR LN 2018-01-02 MF Import

APPENDIX A FIELD EXPLORATION PROCEDURES AND LOGS J -1280 Our field exploration for this project included completing a reconnaissance of surface conditions and advancing one boring (B-l) and one hand auger exploration (HA-1). Approximate exploration locations are shown on the Site and Exploration Plan, Figure 1. Exploration locations were determined by measuring distances from existing site features with fiberglass and steel tapes relative to a site plan provided to us by Fred Baxter & Associates. Exploration elevations were determined relative to a site -specific elevation reference point established on a fance post by ZZA staff utilizing hand level methods; no formal survey information was provided during the course of the study. The exploration locations and elevations referenced in this report should be considered as accurate as the degree implied by the measurement method. The following sections describe our procedures associated with the exploration. Descriptive logs of the explorations are enclosed in this appendix. Soil Boring Procedures Boring B-I was advanced via hollow stem auger methods, using a portable drill rig operated by an independent drilling fine working under subcontract to our firm. An engineering geologist ^ om our firm continuously observed the boring, logged the subsurface conditions encountered, and obtained representative soil samples. All samples were stored in moisture -tight containers and transported to our laboratory for further visual classification and testing. Throughout the drilling operation, soil samples were obtained at 2.5-foot depth intervals by means of the Standard Penetration Test (ASTM: D-1586). This testing and sampling procedure consists of driving a standard 2-inch outside diameter steel split spoon sampler 18 inches into the soil with a 140-pound hammer free falling 30 inches. The number of blows required to drive the sampler through each 6-inch interval is recorded, and the total number of blows struck during the final 12 inches is recorded as the Standard Penetration Resistance, or "blow count" (N value). If a total of 50 blows are struck within any 6-inch interval, the driving is stopped and the blow count is recorded as 50 blows for the actual penetration distance. The resulting Standard Penetration Resistance values indicate the relative density of granular soils and the relative consistency of cohesive soils Hand Auger Exploration Methods Hand auger exploration HA-1 was advanced by an engineer from our office utilizing a 3.25-inch diameter hand auger. Soils retrieved as cuttings were continuously observed and classified as they were removed from the exploration. Representative portions of the soils were placed in moisture tight containers and returned to our laboratory for further visual classification. Granular soil density and cohesive soil consistency were evaluated through the use of the Dynamic Cone Penetrometer (DCP) in general accordance with procedures described in ASTM