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MUM- <br /> 5 F111 1 POW N <br /> kat` <br /> FIELD PROCEDURES <br /> q FDecember <br /> med at the site by Applied GeoSystems on behalf of the City of Stockton <br /> accordance with Applied GeoSystems' Site Safety Plan i\'o. ;8009-IS, <br /> 9, 1988, and an updated Safety Plan dated 35009 25, dated lanuanI 17, <br /> 1990. This plan describes the basic safety requirements for our work at the site. Applied <br /> GeoSystems personnel and subcontractors scheduled to perform work at the site are briefed <br /> ort the contents of the site safety plan before work begins. A copy of the site safety plan <br /> was available for reference by appropriate parties during the work. The onsite Staff <br /> Geologist acted as the Site Safety Officer. <br /> p'} <br /> Drilling Methods <br /> Before drilling, Applied GeoSystems notified Underground Service Alert of our intent to <br /> drill so that approximate locations of underground utility lines and structures could be <br /> marked- We hand-augered each boring to a depth of approximately 5 feet below grade to <br /> attempt to locate underground structures. The borings were drilled with a Mobile CINIE 55 <br /> drill rig equipped with 8-inch-diameter, hollow-stem augers. The drillers steam-cleaned the <br /> augers before drilling each boring to minimize the possibility of cross-contamination. <br /> Soil SamQlling in Borings <br /> Soil samples were collected at 5-foot intervals from the ground surface to the full depth of <br /> the borings. The soil samples were collected by advancing the boring to a point immediately <br /> above the sampling depth, and then driving a California-modified, split-spoon sampler <br /> containing equipped with clean brass sleeves through the hollow center of the auger into <br /> the undisturbed native soil. The sampler and brass sleeves were steam-cleaned or washed <br /> thoroughly with a laboratory-grade. non-phosphatic detergent and water before each use. <br /> The sampler was driven 18 inches with a standard 140-pound hammer repeatedly dropped <br /> 30 inches. The number of blow's to drive the sampler each successive 6 inches were counted <br /> and recorded to evaluate the relative consistency of the soil. <br /> v <br /> Q lied 49eoS st <br /> p,� y ems <br />