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ATTACHMENT <br /> FIELD EXPLORATIONS <br /> Suhsurface conditions at the site were explorecl hy driiling thrcc horings in thc earth dam <br /> embankment and excavating five te.et pi�c in the vicinity of tlie detention pond ezpansion. The <br /> borings were drilled to depths ranging Gom 15 to 31.5 fcet on August 24, 1992 using a truck- <br /> mounted, continuous-flight, hollow-stem auger drill. The test pits wcre excavated to depths <br /> ranging from 10 to 14 feet on August 25, 1992 using a rubber-tired, tractor-mounted backhoe. <br /> The eaplorations were locatal by pacing from existing features. <br /> An engineering ga�logist with our firm continuously monitored lhe explorations and <br /> maintained a detaileci log o(the soil and ground water conditions encountered. Soils encounterc� <br /> were claesified in general accordance with the classification system de.acribed in �igure A-I. A <br /> key to the symhols used on the boring logs is presented in Pigure A-2. Logs of the ezplorations <br /> are included ac Figures A-3 through A-S. Elevations shown on the logs are hased on Boeing <br /> darum. <br /> 7he explora�ion logs are basul un our interpretation of�he field and lahoratory data and <br /> indicate the various types of soils encounterul. They also indicate the depths at which these soils <br /> or their characteristics change, although the change might actually he gradual. If the change <br /> occurreci between samples in the horings, it was imerpretul. <br /> Relatively undisturhed samples werc ohtainecl from the borings using a Dames & Moore <br /> 2.4-inch inside diameter split-harrcl sampler. The sampler wa� driven 18 inches using a 300- <br /> pound weight falling a vertical disiance of approxima�ely 30 inches. Thc number of blows <br /> requirul to drive the sampler the last 12 inches, or other indicatecl distance, is recordal on the <br /> boring logc. <br /> GEOTECHNICAL LABORATORY TESTING <br /> All uf the �oil s;unples uhtainecl frum the explorations wero se:dul and hrought to our <br /> Inhoratory for funhcr examination. Sele�leJ samples K�cre tested to determine moisnue content, <br /> dry density anJ fines coment. The linex coment analyses k�cre performul in accurdance with <br /> ASTM D-I 140-54. Rcsults of'these tests arc presented in the hnring lugs. <br /> t <br /> G e n f n g i n e c r e !� - � f�ile Nn.0120-ISO.RIO <br />