COMPLIANCE INFO_1996-2002 - Laserfiche WebLink

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u n 0 n 0 u u C C u i 0 u u Mr. Michael Walton Walton Engineering December 20, 1996 soil samples (representing one soil sample composite) were collected from every approximated 100 cubic yards of soil material (Figure 2). The stockpiled soil was covered with plastic sheeting and left onsite pending the results of the laboratory analyses. 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). Each set of four individual soil samples were composited by the laboratory into one soil sample for analytical testing. Soil samples collected from beneath the former underground fuel storage tank system and from the associated soil stockpile were analyzed by California Laboratory Services, Inc., (CLS) of Rancho Cordova, California for: Total petroleum hydrocarbons in the range of gasoline (TPHg) using Environmental Protection Agency (EPA) Method 8015 (modified) with purge and trap EPA Method 5030 Total petroleum hydrocarbons in the range of diesel fuel (TPHd) using EPA Method 8015 (modified) with sonication EPA Method 3550 Volatile organic compounds benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using EPA Method 8020 with purge and trap EPA Method 5030 In addition to these analyses, the three soil samples collected from beneath the 12,000 -gallon gasoline storage tank and the three soil sample composites collected from the soil stockpile were analyzed for: Total lead using EPA Method 6010 and the five individual soil samples collected from beneath the former underground gasoline storage tanks (T1 and T3) were analyzed for: Methyl t -butyl ether (MTBE) using EPA Method 8020 with purge and trap EPA Method 5030 CLS is accredited by the State of California to perform all of these analyses. Laboratory results of soil samples indicated that concentrations of TPHg, TPHd, and BTEX compounds were not present in any of the soil samples collected from beneath the former underground fuel storage tanks at concentrations greater than the reporting limits of the laboratory methods (Table 1). No concentrations of TPHg, TPHd, or BTEX, greater than the reporting limits of the laboratory methods, were found in either of the soil samples collected from beneath the former fuel dispenser island (Table 1). Laboratory analysis for the presence of MTBE in soil indicated that Grayland 022-130.trr GRA YLAND ENVIRONMENTAL