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'} April 6, 1998 Page 2 • locations of PD-1, PD-2, and PD-4, due to field evidence ofetrol p eum hydrocarbon impact in the samples collected at 2 feet Sample locations are shown on Figure 2 PEG also collected four to one composite samples from two stockpiles for disposal profiting The stockpiles, designated SP-1 and SP-2, were generated from the product dispensers and segregated in the field based on field evidence of hydrocarbon impact On January 29, 1998, both stockpiles, totaling approximately 75 cubic yards of soil, were -transported by Manley & Sons Trucking, Inc , to Forward Landfill, a state-licensed facility located in Manteca, California A disposal confirmation form is included in Attachment A, along with the certified analytical reports All samples were retained in brass liners, labeled, and capped with Teflon® sheets and plastic endcaps The samples were then sealed in zip-lock bags and placed on ice The samples were then transported to Sequoia Analytical, a state-certified laboratory located in Redwood City, Cahforma, accompanied by chain-of=custody documentation FLNTIDINGS Subsurface Conditions Hydrocarbon staining and odor were apparent in the backfill material beneath PD-1, PD-2, and PDA Therefore, these areas were excavated to retrieve additional samples A slight odor was detected in the shallow sample collected at PD-3, however overexca- vation was not performed due to the presence of product piping that was not scheduled to be removed At the locations of PD-1, PD-2, and PD-4, the limits of the excavations measured approximately 5 square feet and approximately 5 feet into native soil Hydrocarbon staining and odor were still apparent after the hmited excavation beneath PD-1, PD-2 and PD-4 However, overexcavation was terminated so as not tojeopardize the struc- tural integrity of the canopy supports Soil Analyses As requested by Mr lnfurna of the San Joaquin County Public Health Services, the soil samples collected at 2 feet below the dispensers were analyzed for the follo'%ving parameters total purgeable petroleum hydrocarbons calculated as gasoline (TPPH-g) by EPA Method 8015 (modified), benzene, toluene, ethylbenzene, and total xylenes (BTEX compounds), and methyl tert-butyl ether (MtBE) by EPA Method 8020 Samples collected at 5 feet below dispensers were analyzed for TPPH-g, BTEX compounds, and oxygenate compounds by EPA Method 8260 The specified oxygenates compounds 3111791A/5oILREP r