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File Report April 7, 1998 locations during the owner's investigation into the vapor recovery system problem, RCP determined that it should quickly identify any problems associated with the referenced localized surface spill. On March 13, 1998, Amherst's geologist collected two shallow soil samples from the area identified by the SJCEHD as the entry point of the surface spill (lowest point where the reported hydraulic pumping occurred). A small portion of the concrete apron in this settled area was lifted out by hand and an undisturbed sample collected at the concrete soil interface. The geologist then hand excavated down to a depth of 1.5 feet below the concrete soil interface where a second undisturbed sample was collected (see Figure 2). Given the closed status of the facility, these samples were collected to determine a "worst case scenario" of the impact due to the diesel spill identified in September 1997. The following procedures were used and maintained in the collection of these two samples. Undisturbed Soil Sample Collection The undisturbed soil samples were collected per California Code of Regulations, Title 23, Section 2654, Subsection C. A hand-driven sampler coupled with a stainless steel sleeve was used to collect undisturbed soil samples. Once the desired depth for sampling was reached, a hand sampler was driven to the desired depth, the sleeve removed from the sampler, the ends sealed with Teflon followed by airtight plastic caps, and placed in an ice-chilled cooler for preservation. Strict chain-of-custody forms were maintained to document the sample collection and transportation to the laboratory for analysis. Analytical Laboratory Analysis These two samples were submitted to Sequoia Analytical (a California State Certified Laboratory) for chemical analysis for total petroleum hydrocarbons as diesel by modified EPA method 8015 and for Gasoline, benzene, toluene, ethylbenzene, and xylene by 4 RCP0407