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i IMerx"OuNING sample collected from boring DI-1 to 1,580 mg/kg of total xylenes in the 20-foot sample from boring B 1 ' Groundwater samples were collected from wells MW1, MW2, and MW3 on February 10, 1993 The samples were analyzed for TPH-G, TPH-D, TPH as JP4jet fuel, TPH as motor oil, and BTEX Analytical results from the groundwater samples identified no concentrations of these constituents above laboratory detection limits 3.0 GROUNDWATER SAMPLING The following sections describe the groundwater sample collection, groundwater laboratory analytical results, waste storage and disposal, and results of the water well search Groundwater samples were collected according to the Sampling and Analysis Plan submitted in Versar's Site Investigation Workplan, dated August 2, 1995, and Workplan Addendum, dated May 10, 1996 3.1 Groundwater Sample Collection On April 3, 1997, groundwater samples were collected from groundwater monitoring wells MW1, MW2, and MW3 at the Site Prior to purging and sampling, depths to groundwater in monitoring wells MW 1, MW2, and MW3 were recorded at 37 31, 37 33, and 37 05 feet bgs, respectively Each monitoring well was purged of approximately three casing volumes of water, the water level was allowed to recover to at least 80 percent of the pre-purge level, and then the wells were sampled During purging activities, the pH, temperature, and conductivity of the purged water were monitored and recorded at regular intervals to assess the influx of representative formation water into the well Data collected prior to and during purging and sampling were recorded on monitoring well purge tables, which are included in Appendix A ' Samples were collected, placed in containers, preserved, and analyzed within the time constraints consistent with applicable regulatory agency requirements Samples were tracked using Versar's chain-of-custody forms The sampling team maintained custody of the samples from the time of collection until submittal to the laboratory 3.2 Groundwater Sample Analytical Results Three groundwater samples were collected and submitted for laboratory analysis Groundwater samples from MW1, MW2, and MW3 were analyzed by Excelchem Environmental Laboratories (California Department of Health Services Certification No 2119) for TPH-JP4, ' BTEX, and MTBE Analyses of the groundwater samples identified no concentrations of TPH- H 1PROJECTSIDSAISTOCKTONI4TH\FINALIREPORT FL 5 i