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19 March 1999 <br /> AGE-NC Project No. 98-0471 <br /> Page 5 of 12 <br /> removal procedures, an additional 300 yards of impacted soil will be removed from the site and <br /> transported for disposal. Soil will be excavated to a maximum depth of 8 feet bsg. During excavation <br /> activities, excavated soil will be screened for volatile organic compounds (VOCs)using an organic <br /> vapor monitor(OVM). Excavated soil that appears visibly stained, has measurable VOCs or has a <br /> petroleum hydrocarbon odor will be considered impacted. <br /> 3.3. EXCAVATION SOIL SAMPLE COLLECTION AND ANALYSIS <br /> A total of eight soil samples will be collected from the excavation and will be submitted for <br /> laboratory analysis. Following State of California Regional Water Quality Board, Tri-Regional <br /> Board recommendations, soil samples will be collected from the base and each side wall of the <br /> "new"excavation at a minimum interval of every 20 linear feet. Soil samples will be collected from <br /> the base of the excavation at a minimum of one sample for every 400 square feet of excavation area, <br /> approximately four samples. Field procedures for collection of soil samples are presented in Section <br /> 4.2. <br /> Selected soil samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents: <br /> • TPH-g by EPA Method 8015 Modified/5030; <br /> • BTEX by EPA Method 8020; and <br /> • Fuel oxygenates including methyl tert-butyl ether(MTBE),tertiary-butyl alcohol (TBA), di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether <br /> (TAME) by EPA Method 8260 Modified. <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 /> 3.4. MONITORING WELL INSTALLATION <br /> To confirm and monitor the lateral extent of the dissolved hydrocarbons six ground water monitoring <br /> wells shall be installed at locations depicted on Figure 2. <br /> Advanced GeoEnviron mental,Inc. <br />