COMPLIANCE INFO_1997-2007 - Laserfiche WebLink

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i u r, 0 n 11 0 0 Mr. Michael Walton Walton Engineering March 20, 1998 A total of six soil samples were collected from beneath the former fuel dispenser islands (Figure 2). Additionally, one soil sample was collected from beneath a former underground product pipeline (Figure 2). These soil samples were collected in situ at depths ranging from 3 to 4 feet below ground surface using the AMS core sampler immediately following the removal of overburden material. Each individual sample sleeve containing a soil sample was sealed with plastic end caps, labeled with the project and sample identification numbers and date, and placed in iced storage immediately following sample collection. The soil samples were delivered to the environmental laboratory, while adhering to the required chain of custody procedures (Appendix A). Soil Stockpile Sample Collection Soil and backfill material removed from the open excavation during the tank removal operation was stockpiled on asphaltic -concrete near the southwestern corner of the site. Grayland collected a total of four soil sample composites from the soil stockpile. Each individual soil sample was collected using the percussion core sampler by first removing approximately 1 foot of soil/backfill material from the surface of the pile and then driving a clean stainless steel sleeve into the freshly exposed surface of the pile. A total of four individual soil samples (representing one soil sample composite) were collected from every approximated 100 cubic yards of soil material (Figure 2). The individual soil samples were handled in the same manner as described above. Each set of four individual soil samples were composited by the laboratory into one soil sample for analytical testing. Overexcavation Soil Sample Collection Because it was apparent that native soil situated mainly beneath the northern end of former underground storage tank T1 was contaminated with fuel hydrocarbons, the northwestern corner of the open excavation was deepened to approximately 24 feet below ground surface. Soil samples were collected by Grayland on November 26, 1997, from the two exterior sidewalls and base of the overexcavated area (Figure 3). The soil samples were collected from the bucket of the excavator and handled in the same manner as described above. The soil samples were delivered to the environmental laboratory for analytical testing, while adhering to the required chain of custody procedures (Appendix B). Abandoned Pipeline Soil Sample Collection Grayland returned to the site on December 2, 1997, to collect soil samples from beneath an abandoned underground product pipeline, which apparently was used to deliver fuel to the fuel dispenser islands situated formerly along Alpine Avenue. Four holes were cut in the asphaltic - concrete at approximate 20 -foot intervals along the abandoned pipeline (PL2 thm PL5 on Figure 2). A hand -auger was used to excavate soil in each hole to approximately 3 to 4 feet below ground surface. A soil sample was collected from the base of each auger hole using the percussion core sampler attached to a steel extender rod. Each soil sample was retrieved and was handled in the same manner as described above. The soil samples were delivered to the environmental laboratory for analytical testing, while adhering to the required chain of custody procedures (Appendix B). Grayland 022-160xrc GRA YLAND ENVIRONMENTAL