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1 r • ' Plastic bottle with a Teflon septa The samples for lead analyses were filtered in the field and preserved with nitric acid The other samples were preserved with hydrochloric acid. All the samples were stored in a chilled cooler containing crushed ice to maintain the sample at 4°C for delivery to the laboratory Strict chain-of-custody protocols were followed in all phases of sample handling The borings were backfilled with cement grout upon completion of ' sampling activities The sections of sidewalk removed during the investigation activities were replaced with fresh concrete All equipment used during this investigation which might have come into contact with contaminated material was thoroughly decontaminated before and after each use This was accomplished by washing with Alconox (a laboratory-grade detergent) and rinsing with deionized or distilled water r 6.0 LABORATORY ANALYSES ' The samples were sent to McCampbell Analytical Inc of Pacheco, California, a state--certified laboratory, and analyzed for • TPHg using EPA Method 5030/GCFID; • BTEX using EPA Method 8020, • TPHd using EPA Method 8015M, r oxygenated volatile organic compounds (9 oxygenates) using EPA Method 8260 ; and • Total lead using EPA Method 239 2 rThe samples were analyzed on a normal 5-day turnaround basis 6.1 Laboratory Analytical Results rThe laboratory analytical results are summarized in Table 1 and Figure 3 Laboratory certificates are included in Appendix A ' The results are as follows Analysis of the groundwater samples indicated that ' Petroleum Hydrocarbons • TPHg concentrations were less than 50 0 ug/L (not detected) rBenzene concentrations were less than 0 5 ug/L (not detected) • Toluene concentrations were less than 0 5 ug/L (not detected) 4 I