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Geo(ngicaf%cfmics Inc. Page 6 Hunter Container Report-Soil and Groundwater Investigation Project No. 397.2 October 25, 1996 • Disposable gloves were used by the technician to collect all samples and were changed with each sampling event. • A bailer blank for each well was collected prior to sampling by filling the decontaminated stainless steel bailer with water (provided by the laboratory) and then filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection. Bailer blanks for each sample, along with a field blank (prepared from water provided by the laboratory poured into a VOA vial on site), will accompany the samples to the laboratory and serve as checks against cross contamination. A chain of custody document, listing all samples collected, accompanies the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity. All water purged from each monitoring well and not used as a sample, was placed in a 55 gallon DOT approved container, properly labeled and stored on site until its proper disposition can be arranged. 1 1.5 Soil and Groundwater Sample Analyses The following summarizes the sample testing used for this phase of work. The samples were submitted to two separate licensed analytical (Sherwood in Hilmar and Sequoia in Sacramento). A summary of the lab data is attached in Table 1. 1. Three soil samples from each borehole was tested for the following compounds: • Volatile organic compounds (VOCs) by EPA method 8240 1 • Petroleum hydrocarbons (BTEX by EPA method 5030/8020, TPH- gasoline by EPA method 5030/8015m, TEPH-, kerosene, diesel, motor oil by EPA method 3510/8015m) 2. One groundwater sample was tested for the following: • Volatile organic compounds (VOCs) by EPA method 8240 • Petroleum hydrocarbons (TPH- gasoline by EPA method 8015m, TEPH-, kerosene, diesel, motor oil by EPA method 8015m) 3. One septic water sample was tested for the following: • Volatile organic compounds (VOCs) by EPA method 8240 • Petroleum hydrocarbons (TPH- gasoline by EPA method 8015m, TEPH-, kerosene, diesel, motor oil by EPA method 8015m) • CAM 17 Metals The detection limits for these compounds were very matrix dependent as can be seen in the lab sheet enclosed in Appendix B. The primary cause for this is that there was such a high concentration of gasoline, diesel, and motor oil contained in the samples that they interfered with the volatile organic compound analysis.