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19 March 1999 <br /> AGE-NC Project No. 98-0471 <br /> Page 6 of 12 <br /> 3.4.1. Soil Sample Collection and Analysis <br /> A total of six soil borings will be advanced for collection of soil samples and the installation of <br /> shallow ground monitoring wells in locations shown on Figure 3. Soil borings will be advanced to <br /> an approximate depth of 15 feet bsg. Soil samples will be collected from each boring at five-foot <br /> intervals from ground surface to the total depth of the boring. Field procedures for advancement of <br /> soil borings and collection of soil samples are presented in Section 4.1. Up to 12 soil samples, two <br /> from each soil boring, will be submitted for laboratory analysis. <br /> Selected soil samples will be analyzed by a State of California Department of Health Services(DHS) <br /> -certified laboratory for the following constituents: <br /> • TPH-g by EPA Method 8015 Modified, <br /> • BTEX and MTBE by EPA Method 8020 and <br /> • Fuel oxygenates: di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE),methyl tertiary <br /> butyl ether(MTBE), tertiary amyl methyl ether (TAME) and tertiary butyl alcohol (TBA) <br /> 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 /> 3.4.2. Monitoring Well Installation and Development <br /> The ground water monitoring well will consist of 5 feet of well screen section. The wells screen <br /> section will be installed in the saturated clay layer at ten to fifteen feet bsg, below the ground water <br /> table level. AGE believes installing the screens the top of the saturated zone will minimize the <br /> potential for providing a vertical pathway to conduct impacted ground water up into the surficial <br /> peat. The ground water is encountered at a depth of eight feet bsg, yet rises under pressure to five <br /> feet bsg. The peat has a very high permeability and porosity, combined with a high water table, <br /> ground water would be able to infiltrate the peat. Based on the observed ground water table level, <br /> it is anticipated that the total depth of the monitoring wells will be approximately 15 feet bsg. <br /> Following well installation, the wells will 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 4.2 and 4.3, <br /> respectively. <br /> Advanced GeoEnvironmental,Inc. <br />