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• ' 14 September 1998 , <br /> AGE-NC Project No. 98-0468 <br /> Page 6 of 10 <br /> Groundwater samples will be analyzed by a State of California DTSGcertified laboratory for the ; <br /> following constituents: <br /> • TPH-d by EPA Method 8015 Modified/5030; <br /> TPH-g by EPA Method 8015 Modified/5030; <br /> • BTEX by EPA Method 602; and <br /> Oxygenating compounds including MTBE,TBA,DIPE,ETBE,and TAME-by,EPA Method <br /> 8260. <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 /> 3.4: MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> A total of two ground water monitoring wells will,be installed down gradient(north) of the former <br /> UST locations(Figure 3). The ground water monitoring wells will be installed in the two deep soil <br /> borings discussed in Section 3.2. The ground water.monitoring wells wi,11 consist oke feet.of-well <br /> �.� . <br /> screen section. The well screen section will be installed across the observed water table level with <br /> ten feet of screen section extending below the'ground water table level and five of screen extending <br /> above the-water table. Based on the observed ground water table level, it is anticipated that the total <br /> depth of the monitoring wells will be approximately 20 to-25 feet.bsg. <br /> Following well installation, the wells wiII be developed in order to maximize water flow into the <br /> well and minimize the amount of fine-grained sediment drawn into the well during pumping or <br /> bailing. Procedures for well'installation and development are presented in Sections 4.3 and 4.4, <br /> respectively. <br /> 3.5." . GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Following the installation of the two additional monitoring wells, one ground water monitoring and <br /> sampling event will-be conducted at the site. Ground water samples will be collected from the five <br /> site monitoring wells,(MW-1 through MW-3 'and the two proposed wells) and submitted for <br /> laboratory analysis. Ground water samples will be analyzed for BTEX, TPH-d, TPH-g,.and <br /> oxygenating compound's following the protocols presented in Section 3.3". Additionally, monitoring. <br /> activities Will include recording depth to,ground water measurements and collection of ground water <br /> samples. Ground water sample collection procedures are described in Section 4.5. <br /> Advanced GeOEnvironmental,Inc. <br />