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Second Quarter 2001 Ground Water Monaonng Report Cleanup and Abatement Order No 5-00-707 _ EAI Project No 1232 2.0 FIELD INVESTIGATION 21 Ground Water Sampling On May 30, 2001, prior to purging or sampling activities, depth measurements to fluid levels were obtained by EAI from all monitoring wells associated with the Wards (MW-1 through MW-7) and Unocal (MW-10 through MW-25D) sites Depth measurements were obtained using an interface probe accurate to 0 01 foot (see Table 2) No free-product was detected in any of the wells The water level measurement for each well was converted to mean sea level (MSL) datum by subtracting the measured water level for each well from its respective "top of well casing elevation" datum (see Table 2) On May 30 and 31, 2001, ground water samples were collected by EAI from all ground water monitoring wells associated with the Wards and Unocal sites Prior to sampling, the wells were purged using a Grundfos MP-1 submersible pump Temperature, conductivity, pH, and turbidity were recorded to evaluate the effectiveness of purging activities (see Appendix A) The wells were sampled in the order that purging activities were completed Water samples were collected from each well from dust below the water surface using Voss Technologies disposable bottom bailers equipped with volatile organic compound sampling tips Use of these bailers precludes the potential for cross-contamination Each water sample was sealed in three 40-milliliter volatile organic analysis (VOA) vials with Teflon septa lied lids The VOA vials were completely filled so that no headspace existed between the sample and the lids The samples were labeled with the sample point identification, preservative added, if any, date, time, and EAI project number, and immediately placed into a chilled ice chest The samples were kept chilled until delivered to the laboratory for analytical testing All samples were logged on a chain of custody record form (see Appendix B) 2.2 Sampling Equipment Cleaning Protocol The submersiblep ump and hose system (Equipment), used only to purge the wells prior to sampling, was decontaminated between each event using the following procedure • The Equipment was flushed in a solution of Alconox detergent and to water, and g p • The Equipment was flushed with tap water 2.3 Effluent Handling All effluent generated during purging, sampling and equipment decontamination activities was sealed in labeled 55-gallon drums or in an on-site 500-gallon storage tank. The water was stored on the Wards site pending proper disposal Manifests documenting disposal of the effluent will be submitted under separate cover • BHM 123280151 4 ENVIRONMENTAL AUDIT, INC