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20 August 2009 AGE-NC Project No. 06- 1457 Page 3 of 7 2.2. 1 . Drilling and Soil Sampling A truck-mounted, hollow stem drill rig equipped with 8-inch diameter hollow-stem augers will be utilized to advance the monitoring well borings to approximately 40 feet, 80 feet and 105 feet bsg. Total depths of the borings may vary according to hydrogeologic/geologic conditions encountered during drilling. Soil samples will be collected from each boring to five foot intervals beginning at five feet bsg, to the total depth of the borings. Selected soil samples will be analyzed by a State of California Department of Public Health (CDPH)-certified laboratory to define the soil plume and complete data gaps, for the following constituents: • TPH-g in accordance with EPA Method 8015 Modified; and • Benzene, toluene, ethylbenzene and total xylenes (BTEX constituents) and fuel additives tertiary butyl alcohol (TBA), di-isopropyl ether (RIPE), MTBE, ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ethylene dibromide (EDB) and I Uichloroethane (1 ,2-DCA) by EPA Method 8260B. Laboratory reports for the soil analyses, testing methods, laboratory QA/QC reports, and sample chain of custody documentation will be presented in a report with fmdings and recommendations. Procedures for monitoring well pilot boring drilling and soil sampling are presented in Section 3 . 1 . 2.2 .2 . Well Completion, Development and Survey Following well installations, the wells will be developed to maximize water flow and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. Procedures for well completion and development are presented in Sections 3 .2. and 3 .3 . , respectively. In addition, the top of the well casing will also be surveyed by a licensed surveyor. 2 .2.3 . Ground Water Sample Collection and Analysis Ground water monitoring and sampling of the newly installed ground water monitoring wells will be conducted on a quarterly basis unless an alternate schedule or suspension of monitoring is approved by the EHD . Ground water monitoring activities will include recording depth to ground water measurements and collection of ground water samples; ground water sample collection procedures are described in Section 3 .4. Collected ground water samples will be analyzed by a CDPH-certified laboratory for the constituents listed in Section 2.2. 1 . Advanced GeoEnvironmental, Inc.