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I11 August 1.999 <br /> AGE-NC Project No. 95=0109 <br /> Page 2-of 10' <br /> 2.2. SOIL PROBING AND SAMPLING " <br /> On 09 and '10 February'1999, six soil probe borings.(probings) were advanced.at the site using <br /> AGE's Geoprobe 5400 probirig unit eq�iipped�with 1.125 diameter;prob&'rods and a"1.5-inch <br />' diameter'soil sampling assembly. Probings P22 through P27'were advanced to total depths ranging . <br /> from 50 to 55.feet below surface grade(bsg). Probings were,advanced to monitor the.progress of'soil <br /> remediation at the site. Soil samples were collected at various depths, based-on data from previous,' <br />'. probings and borings. Probing locations are shown on Figure 2. <br />' All samples were collected using the Geoprobe soil sampling assembly loaded-with four 1.125-inch <br /> by 6-inch brass sleeves. After collection, the ends. of the second brass sleeve were covered'with <br /> aluminum sheets, capped and-sealed with tape' All soil samples were labeled,'placed-in a chilled <br />' container and.selected samples were transported,under chain-of-custody to McCampbell Analytical,. <br /> Inc. (MAI) in.P.acheco, California, a Department of Health Services (DHS)-certified laboratory. . <br />' All sampling'tools used for sample collection were thoroughly rinsed with clean water after washing <br /> with a solution of Alconox between each sampling run. All probings were backfilled over their entire <br /> depth with Portland cement,' using a tremmie pipe. <br /> ' 2.3. LOGGING <br /> Soil was extruded from the remaining brass sleeves and`screened.for the presence of organic vapor <br />' using an :organic. 'vapor meter equipped, with a: photo-ionization detector (PID: .Thermo ; <br /> Environmental"580A,' I6.0eV,•calibrated to isobutylene)- and the readings were recorded on,the <br /> boring Iogs. S'oil.was visually described in'accordance with the Unified Soil Classification System <br />' (Boring Logs APPendix:A). <br /> 2A. ADDITION OF HYDROGEN PEROXIDE TO'SOIL PROBINGS ; <br /> Prior to"backfilling, hydrogen peroxide was added to probings P25; P26 and P27. Approximately 9 <br /> gallons of 1 percent hydrogen peroxide was'added to three probings. A tremmie pipe was used <br /> , . . . P g .PP , <br /> to direct the peroxide tothe lower soil interval and to ground water. Hydrogen.peroxide-was not <br /> added to the remaining.probings due to the proximity of nearby wells previousiy utilized for addition <br />' of peroxide. <br /> Advanced GeoEm'ironmental,Inc. <br />