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' 3291 S.Highway 99 Page 3 <br /> Soil Boring Installation <br /> ' GPE Project 471.2 <br /> August 17,2007 <br /> ' 2.0 SOIL & GROUNDWATER INVESTIGATION <br /> ' 2.1.1 Preliminary Site Work <br /> Prior to beginning the field work, a Work Plan describing he work to be <br /> performed was prepared and submitted to the San Joaquin County <br /> ' Environmental Health Department along with an application for a drilling <br /> permit. The agency issued the permit shortly thereafter. A copy of the <br /> permit is attached as Appendix C. <br /> 2.1.2 Soil Boring Installation <br /> The Geo-ProbeTM soil borings (designated as B-1 & B-2) were installed at <br /> points indicated on the attached site map, just west of the on-site septic tank <br /> and through the leach field. On August 7, 2007, Geo-Prob TM model 6600 <br /> ' drilling equipment owned and operated by RSI Drilling (C-57 License <br /> #802334) was mobilized to the site. The boring B-1 was advariced to a depth <br /> of 25 feet below grade at a point 10 feet west of the septic tank, and soil <br /> ' samples were collected for the purposes of keeping a boring 1)g. Boring B-2 <br /> was placed 40 feet west of the septic tank and was also advanced to a depth <br /> of 25 feet. <br /> ' The Geo-ProbeTM used direct-push methodology in which the drilling tools are <br /> pushed directly into the ground using a hydraulic ram and harnmer system. The <br /> lead four feet of the probe is a soil sampling device fitted with an acrylic sample <br /> sleeve. Groundwater was not,encountered at the total depth. Jpon collecting <br /> the final soil sample in each boring, the borings were abandoned by filling to <br /> the surface using Class G neat cement under County supervision. <br /> ' 2.1.3 Soil Sampling <br /> During drilling, continuous cores were collected by repeatedly <br /> pushing/hammering the 4-foot soil sampling tube into the ground. The soil <br /> cores are collected in clear plastic sleeves. The soil contained in the lower <br /> end of each section of core was carefully examined. Upon collection and <br /> logging, the sample sleeves were sealed, labeled and retained for possible <br /> future laboratory analysis. The section of core from 24 to 25 feet in each <br /> boring was retained for laboratory analysis. <br /> During drilling, a log was made of the borings. Information noted includes <br /> such data as sample depths, horizons of detectable contamination (detected <br /> by field methods), soil classification utilizing the Unified Soil Classification <br /> System and sediment description (color, texture, composition, hardness, <br /> ' 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209) 569-0295 <br />