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['Joo4 After heating the glass sample containers until warm, headspace vapors were analyzed with a Photovac TIP 1 Air Analyzer. The TIP 1 was periodically calibrated to measure all of the ionizable hydrocarbons as if they were benzene, using a standard gas. The results of these field analyses are noted on the drilling logs (Appendix B) , and were used to select soil samples appropriate for chemical. analysis. Two to four soil samples were selected for chemical analysis from each boring according to the following criteria: (1) The sample collected closest to the water table. (2) The sample collected five feet below the water table. (3) The sample with the highest apparent hydrocarbon concentration. (4) The deepest sample with apparent presence of hydrocarbons. In soil borings where headspace analyses indicated no hydrocarbon presence, samples were chosen by criteria 1 and 2. The water table was estimated in the field as the depth where the first apparently saturated sample was recovered (7 to 9 feet below ground surface) . Soil samples were submitted to a State-certified analytical laboratory (Groundwater Technology Environmental Laboratories) for the following analyses: total petroleum hydrocarbons as gasoline (EPA Method 8015) ; benzene, toluene, ethylbenzene and xylene (EPA Method 8020) ; and total lead (EPA Method 7421) . All soil samples were transferred to the laboratory by the geologist, where they were frozen and stored. Chain-of-custody forms were completed for samples submitted for chemical analysis. Copies of these forms are included in Appendix C. GROUNDWATER SAMPLING AND ANALYSIS Groundwater. samples were collected from all observation wells for chemical analysis. Prior to purging each well, the depth to water was measured and recorded. An acrylic bailer was then used to collect a sample from the water surface to check for floating product. Each well was purged with a t 3286a/BAV100 17