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15 September 1999 <br /> AGE-NTC Project No. 97-0369 <br /> Page 5 of 9 <br /> Laboratory reports for the 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. MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> At least three ground water monitoring wells will be installed at the site to further assess petroleum <br /> hydrocarbon impacts to shallow ground water. Proposed monitoring well locations are illustrated <br /> on Figure 2. Well locations are proposed to provide definition of the lateral and vertical extent of <br /> dissolved hydrocarbons. Monitoring of the yells should provide data to determine if the dissolved <br /> plume is migrating or stable. <br /> Following well installation, each well will be developed to maximize water flow and minimize the <br /> amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well <br /> installation and development are presented in Sections 4.1 and 4.2, respectively. <br /> 3.4. GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Ground water monitoring and sampling activities for each newly installed ground water monitoring <br /> well will be conducted on a quarterly basis unless an alternate schedule or suspension of monitoring <br /> is approved by the PHS-EHD. Ground water monitoring activities will include recording depth to <br /> ground water measurements and collection of ground water samples. Ground water sample collection <br /> procedures are described in Section 4.3. <br /> Ground water samples will be analyzed by a State of California Department of Health Services <br /> (DHS)-certified laboratory for the following constituents: <br /> • TPH-g and TPH-d by EPA Method 8015 Modified/5030; <br /> • BTEX by EPA Method 602; <br /> • Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE). tert amyl <br /> methyl ether (TAME), and MTBE by EPA Method 8260 modified. <br /> Laboratory reports for ground water analyses, testing methods, laboratory quality assurance/quality <br /> control (QA/QC) reports, and sample chain of custody documentation will be presented in a report <br /> \with the findings and recommendations. <br /> Advanced GcoEn\ironmcntal.Inc. <br />