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' 07 May 2004 • y AGE-NC Project No 98-0534 ` ' Page 2 of 14 - a The former 20,000-gallon diesel UST (Tank 1)'was located east of the two former 10,000-gallon ' diesel USTs (Tanks 2 and 3), at the south east corner of the two common UST excavations The former 20,000-gallon gasoline UST (Tank 4) was located east of the three 10,000-gallon gasoline ' USTs (Tanks 5, 6 and 7), and the 1,000-gallon w/o UST (Tank 8) was located at the western edge of the site The former fuel dispensers were located at the southern end of the site along the site entrance on Navy Drive Petroleum odors and visible stains were observed by AGE during the UST removals Following removal of the USTs and collection of soil samples, the excavations were backfilled to surface grade with clean fill material ' During the UST removals, representatives of AGE collected a total of forty-two soil samples from beneath the USTs, product lines and dispenser area Soil samples were collected from beneath the ends of each UST and soil samples were also collected from below the center portions of the " ' 20,000-gallon USTs Three soil samples were collected beneath the fuel dispenser A total of fourteen soil samples were collected from the product line trench,approximately one soil sample for every twenty linear feet of product line In addition, eighteen soil samples were collected from the stockpiled soil f The soil samples were transported under chain-of-custody to McCampbell Analytical Laboratories, '. Inc (MAI) a State of California Department of Health Services (DHS)-certified laboratory in Pacheco, California, and selected soil samples were analyzed for the following Io Total petroleum hydrocarbons quantified as diesel (TPH-d), total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA method 8015 modified, • Purgeable aromatic hydrocarbons benzene,toluene,ethylbenzene and total xylenes(BTEX) �- in accordance with EPA method 8020 and I • Fuel oxygenates,including methyl tert-butyl ether(MTBE),tertiary-butyl alcohol(TBA),di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether (TAME) in accordance with EPA Method 8260 modified A summary of soil sample analytical results are presented m Tables 1`andA ny'g - - - w_ Under direction from the EHD, four `grab' ground water samples were collected from the UST excavations for Tanks 1, 4, 5,and 6 The water samples from Tanks 1 and 4 were analyzed for TPH-d,TPH- ,BTEX and the fuel additives DIPE,ETBE,MTBE,TAME,TBA The wafer samples ' from Tanksd 5 were analyzed for TPH-g, BTEX compounds and the fuel additives DIPE, ETBE, MTBE, TAME, TBA TPH-d, TPH-g, BTEX and fuel additives were detected in the soil samples collected from the UST excavations TPH-g and BTEX were detected in four of the seventeen soil samples and TPH-d was I ' Advanced GeoEnvironmenital,Inc