Laserfiche WebLink
05 November 2007 <br />AGE-NC Project No. 06-1481 <br />Page 4 of 7 <br />the risk from the prior detections of chemicals at the site. <br />AGE will advance a total of 28 borings using direct push technology in the areas of concern to assess <br />for contaminant-impacted vapor, or soil and/or ground water beneath the site. <br />Seven borings will be advanced to twenty feet below surface grade (bsg) for the collection <br />of soil samples. <br />Eighteen soil borings will be advanced for the collection of soil vapor samples collected from <br />a depth of 5 feet bsg. <br />Three borings will be advanced to depth of 45 feet or until ground water is encountered for <br />the collection of grab ground water and soil samples. <br />The proposed probe boring locations are illustrated in Figure 2. Field procedures for advancement <br />of probe boring and collection of soil samples are presented in Sections 4.1 and 4.2. <br />As the borings are advanced for soil sampling, soil will be collected at 5-foot intervals beginning at <br />5 feet bsg and extending to the total depth of the probe boring. Selected soil samples from each probe <br />boring may be submitted for laboratory analysis. Samples selected for analysis will be analyzed by <br />a State of California Department of Health Services (DHS)-certified laboratory for some or all of the <br />following constituents: <br />Total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (diesel), hydraulic oil <br />(TPH-ho) and motor oil (TPH-mo) in accordance with EPA Method 8015M; <br />Volatile organic compounds, including benzene, toluene, ethylbenzene and xylenes (BTEX), <br />and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8260; and <br />CAM 17 Metals in accordance with EPA Method 6010B. <br />Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control <br />(QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br />findings and recommendations. <br />3.3. GRAB GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br />Grab ground water samples will be collected from three of the ten borings based on site conditions <br />during the boring process using a Geoprobe water sampling assembly. Samples will be collected into <br />40-ml volatile organic analysis (VOA) vials and 1-liter amber bottles as appropriate for the required <br />Advanced GeoEnvironmental, Inc.