ARCHIVED REPORTS_WELL INSTALL AND QUARTERLY GROUNDWATER MONITORING REPORT 2008

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Well Installation and Quarterly Groundwater Monitoring Report Second Quarter 2008 1950 West Fremont Street, Stockton, California 2.6 INVESTIGATION DERIVED WASTE MANAGEMENT ' All non-consumable drilling equipment(augers, drill bits,DPT rods and samplers)that came into contact with potentially contaminated soil or groundwater was decontaminated between each boring. Sampling ' instruments (pumps, water level meters, water analyzers) were decontaminated between each sample by washing with a five percent Alconox/deionized water mixture and rinsed with deionized water. All soil cuttings and water were contained on site in 55-gallon U.S. Department of Transportation (DOT)-approved drums pending analyses for waste characterization. The drums were labeled with date, ' contents, generator, and contact information. Disposable IDW such as personal protection equipment (PPE),bailers, etc.,were double bagged, and disposed of as solid waste. ' All soil and water IDW generated during the June 2008 investigation has been profiled as non-hazardous and is currently being held on the site pending disposal. Copies of COCs for the IDW profiling are provided in Appendix D. 2.7 SURVEYING The locations of all borings advanced in this phase of the work were surveyed on July 2, 2008, by Baumbach and Piazza, Inc. of Lodi, California, a licensed land surveyor. Horizontal coordinates were reported in accordance with California Spatial Reference System-Horizontal and horizontal datum NAD83, to an accuracy of±0.01 foot horizontally. Vertical coordinates were surveyed in accordance with vertical datum NAVD88 to an accuracy of±0.01 foot vertically and are reported as feet above mean sea level.Tabulated survey data are provided in Appendix E. 2.8 QUALITY ASSURANCE/QUALITY CONTROL 2.8.1 Field Quality Control Samples To verify the appropriateness of the quality assurance and quality control (QA/QC)procedures during the ! field program,the QA/QC plan included the collection and analysis of: • One field duplicate groundwater sample; and One trip blank to accompany each cooler containing the samples for VOC analysis. All samples were delivered under chain of custody for analysis to state-certified laboratories as follows: • Maxxam Analytics, Inc. (Maxxam) in Waterloo, Ontario, Canada for NDMA analyses with ultra- low detection limits by EPA Method 607/1625 Modified. Project 102790 7 July 2008