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Report Buffalo Tank Corporation July 15, 1993 Page -2- A second evaluation of the analytical results was performed by the laboratory at the request of the County Inspector. The revised laboratory results submitted by McLaren Laboratory stated that a "dilution was required due to heavy late eluting matrix interference; possible diesel" . Two additional soil samples were obtained by Canonie Environmental from an unknown location and results were submitted to the County in April 1990 . Samples were tested for volatile organics , BTEX, total volatile hydrocarbons, and volatile organics . Toluene was detected at a concentration of 0 . 035 mg/kg. No further work has been conducted at the site. 2 .0 Fieldwork The backfill was removed from the original tank excavation to a depth of approximately 11 feet. The backfill was yellowish- brown, fine to coarse grained sand. During the excavation, the soil was field screened with an organic vapor analyzer (OVA - flame ionization detector) at various depths . No organic vapors were detected in the backfill. The OVA has a detection limit of 1 part per million (ppm) . One ( 1) soil sample was collected from the backfill at a depth of approximately 6 feet for laboratory analyses (sample I .D. 675-fill-6) . At the 11 foot depth, native yellowish-brown, silty, clayey, fine grained sand was encountered. Strong petroleum odors were noted in the native sand. The T-shaped excavation was enlarged to a total depth of approximately 22 feet below the ground surface. OVA readings of 5000+ ppm were detected at approximately 17 and 22 feet below the ground surface. Seven ( 7 ) soil samples were collected at various depths ranging from 17 to 22 feet from the native soil for laboratory analyses (see Figure 2, Appendix A for sample I.D. 's and locations) . The last number in each sample I.D. indicates the depth at which the sample was collected. Excavation was terminated in order to assess the data collected and to review options for additional site investigation and remediation. Four (4) stockpile samples were collected for laboratory analyses (Figure 2, Appendix A) . Each soil sample was collected by driving a clean brass tube into freshly exposed soil. The soil samples were sealed with teflon tape, capped, wrapped with duct tape, labeled, and placed in a cooler chilled with Blue Ice for storage. The soil samples were hand delivered under chain-of-custody procedures to GeoAnalytical Laboratories in Modesto, California. The soil samples collected from the stockpile and the backfill and the samples collected beneath the former location of T2 at 17 . 5 feet CONDOR