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20 September 2007 <br /> AGE-NC Project No. 97-0300 <br /> Page 2 of 6 <br /> The scope of work for this investigation will consist of the following tasks: <br /> • Permitting and pre-field work preparations; <br /> • Geoprobe advancement and soil vapor sample collection; <br /> • CPT soil boring advancement for collection of grab ground water samples; <br /> • Soil vapor and grab ground water sample analysis; <br /> • Review and analysis of soil vapor and grab ground water data and <br /> • Report preparation. <br /> r - <br /> 2.1. PERMITTING AND PRE-FIELD WORK PREPARATIONS <br /> A site specific health and safety plan will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> 1985).Prior to mobilization,each proposed soil boring location will be clearly marked and an utility <br /> clearance obtained through Underground Service Alert. <br /> r <br /> 2.2. PROBING AND COLLECTION OF SOIL VAPOR SAMPLES <br /> Based on the estimated vertical and lateral extent of petroleum-impacted soil (Closure Summary <br /> Report,dated 16 December 2002),AGE proposes advancement of three soil-gas vapor probe borings <br /> to evaluate vapor intrusion at the site (Figure 2). Initially, each soil boring will be advanced to <br /> maximum depths of 5 feet bsg. A single soil vapor sample will be collected from each boring at a <br /> depth of approximately 5 feet bsg. Field procedures for advancement of borings and collection of <br /> soil vapor samples are presented in Section 3.1. <br /> Soil vapor samples will be analyzed by a State of California Department of Health Services(DHS)- <br /> certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 8015 Modified and <br /> • Volatile aromatic compounds(benzene,toluene,ethylbenzene,xylenes:BTEX)and volatile <br /> organic compounds(VOCs)Oxygenated compound(methyl tertiary butyl ether: MTBE)in <br /> accordance with EPA Method 8260 (TO-15). <br /> Advanced GeoEnvironmental,Inc. <br />