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31 October 2007 <br /> AGE-NC Project No. 07-1524 <br /> Page 4 of 10 <br /> hydrogeologic conditions encountered during drilling activities. The first boring will be a cone <br /> penetrometer (CPT) bore; the CPT will acquire a continuous lithologic record to define the <br /> hydrologic units.Additional borings subsequently will be advanced immediately adjacent to the first <br /> bore to acquire soil and grab ground water samples in targeted zones based on interpreted lithologic <br /> data and assessment needs. <br /> Ground water and selected soil sam I s will be analyzed by a California Department of Health <br /> Services (DHS)-certified laboratory for: <br /> • Total petroleum hydrocarbons quantified as gasoline (TP1I-g)in accordance with EPA <br /> Method 8015M; and <br /> • Volatile organic compounds(VOCs), including benzene,toluene,ethylbenzene and xylenes <br /> (BTEX),methyl tertiary-butyl ether(MTBE)and 1,2-DCA,in accordance with EPA Method <br /> 8260. <br /> Laboratory reports for soil and ground water analysis, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be <br /> presented in a report of findings and recommendations. <br /> 3.3. DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance three pilot soil borings at the site for installation of ground water <br /> monitoring wells,using a truck-mounted,hollow-stem drill rig equipped with 8.25-inch hollow-stem <br /> augers to advance the well borings to approximately 20 feet bsg; the total depth of each well boring <br /> may vary according to hydrogeologiclgeologic conditions encountered during drilling. <br /> Well MW-1 will be installed approximately 25 feet northwest of the former UST area, well MW-2 <br /> will be installed approximately 25 feet southwest of the former UST area, and well MW-3 will be <br /> installed approximately 20 feet east of the former UST area. Proposed monitoring well locations are <br /> illustrated on Figure 2. <br /> Soil samples will be collected from within the 8.25-inch hollow-stem augers at five-foot intervals <br /> using a California split-spoon sampler and brass sleeves. At least two soil samples from each boring <br /> will be by a State of California DHS-certified laboratory for the following constituents: <br /> • TPH-g in accordance with EPA Method 8015M. and <br /> • VOCs in accordance with EPA Method 8260. <br /> Advanced GeoEnvironmental,Inc. <br />