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01 November 2011 <br /> AGE-NC Project No. 11-2006 <br /> Page 2 of 4 <br /> depending on site conditions. Approximate boring locations are illustrated in Figure 1. <br /> Borings will be advanced using a GeoProbe® and/or PowerProbe® direct-push drill rigs. <br /> Soil samples will be collected from each boring at five-foot intervals, beginning at five feet <br /> bsg. According to recent information available on the State of California Geotracker <br /> website, ground water at the site likely occurs between 15 feet and 25 feet bsg. Grab <br /> ground water samples will be collected from a minimum of three soil borings. <br /> Soil and grab ground water samples will be submitted to a California Department of Public <br /> Health (CDPH)-Certified laboratory and selected samples will be analyzed for: <br /> • Total petroleum hydrocarbons (TPH-all) in accordance with EPA-method 8015- <br /> modified. <br /> • Volatile organic compounds (VOCs) in accordance with EPA-method 8260B. <br /> Upon completion of the field work and receipt of laboratory analysis, a brief report will be <br /> prepared. The report will be reviewed and signed by a California Professional Geologist. <br /> PROBE BORING ADVANCEMENT <br /> Probe borings will be advanced using a van-mounted Geoprobe® 5400 or Truck-mount <br /> PowerProbe®direct-push probing unit equipped with 1.25-inch ort-inch probing rods.The <br /> Geoprobe®advances soil borings using a hydraulic hammer to drive soil and ground water <br /> sampling tools to specified depths. <br /> SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Soil samples will be collected at discreet five-foot intervals using a 1.25-inch Geoprobe(D <br /> soil sampling assembly loaded with four six-inch stainless steel sleeves. Upon sample <br /> retrieval, the ends of the second sleeve will be covered with Teflon@ sheets, capped and <br /> sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedures to a CDPH-certified laboratory for <br /> TPH-all and VOC analysis. Each sample sleeve will be labeled with the boring designation, <br /> depth, time, date and sampler's initials. Additionally, soil sample duplicates will be <br /> field-screened for the presence of volatile organic compounds using an organic vapor <br /> meter (OVM), equipped with photo-ionization detector (PID). <br /> Advanced GcoEnvironmental,Inc. <br />