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RHmlcf_�_I[Roll Mr. Charles Leubner •' 23 September 1997 Page 3 GEOPROBE SAMPLING PROTOCOL The GeoProbe method consisted of a hydraulically driven, 1-inch and 2-inch diameter continuous corers. By inserting PETG liners inside of a corer, soil samples were recovered at a minimum of 5-foot intervals for lithologic logging, field screening, and laboratory analyses. Groundwater samples from two of the soil borings were collected using a Hydropunch-type sampler to draw groundwater in to the corer, for collection using a bailer. To minimize the potential for cross-contamination, coring equipment and liners were cleaned with a high-pressure hot water washer prior to drilling each boring. After the soil samples were collected, the soil borings were backfilled with a cement grout using a tremmie pipe. The liners that were submitted to the laboratory for analysis were sealed with Teflon sheets secured by plastic caps. The liners were labeled to indicate a unique sample number, the date and time collected, sample locations, and the sampler's identification. The samples were then stored in an ice-chilled cooler for preservation during transport to a State-certified laboratory for analysis. Soil samples were described using the Unified Soil Classification System and selected Ile samples were screened in the field for the presence of organic vapors. Rinse water and excess soil was stored in drums at the site for subsequent disposal. Field screening of soil samples was conducted by monitoring the headspace of sealed plastic bags containing soil samples for the presence of organic vapors. Organic vapors were measured by a photo-ionization detector equipped with an 10 eV bulb. Results of the headspace monitoring and the visual inspection are noted on attached soil boring logs. LABORATORY ANALYSES The soil and groundwater samples selected for analysis were delivered with completed chain-of- custody forms to Excelchem Environmental Labs in Roseville, a State-certified laboratory. Samples from the diesel tank and piping were analyzed for total petroleum hydrocarbons as diesel (TPH-D) by EPA 8015 modified and benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 8020. Samples collected from the soil borings at the gasoline tank were analyzed for total petroleum hydrocarbons as gasoline (TPH-G) by EPA 8015 modified and BTEX. Samples from the deep soil boring for the gasoline tank excavation were also analyzed for MTBE by EPA Method 8020. EDB analysis was by EPA Method 8240. RESULTS Laboratory results are summarized in Tables 2 and 3.