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1 • • <br /> Excavation and Disposal of Hydrocarbon-Impacted Soil <br /> OLYMPIAN MBP -Jimco Truck Plaza <br /> ' 22502 South Highway 99, Ripon, California <br /> At the request of Olympian Oil,Advanced GeoEnvironmental, Inc. (AGE) has prepared this letter <br /> ' summary for the removal of underground storage tanks (USTs), excavation and disposal of <br /> hydrocarbon-impacted soil, analysis of stockpiled soil and total of soils disposed from the <br /> referenced address. The location of the site is illustrated in Figure 1. A plan of the site, showing <br /> ' major structures and former and present USTs and above-ground storage tanks (ASTs),is illustrated <br /> in Figure 2. <br /> ' The following information was obtained from representatives of Olympian Oil,Walton Construction <br /> and Grayland Environmental: <br /> Removal of Former No ern Fuel Islands <br /> ' On 18 June 1998, six fuel dispenser islands and associated piping were removed from the <br /> northern end of the fuel system. The former product line and dispenser locations were <br /> excavated and soil samples were collected for petroleum hydrocarbon analysis. <br /> ' Approximately 150 cubic yards of soil were excavated from the product line and dispenser <br /> areas and was stockpiled near the east end of the service building. The stockpile was later <br /> designated "SP2-East" (Figure 2). <br /> • Three samples were collected from stockpile SP2-East on 01 September 1998 by <br /> representatives of Grayland Environmental and transmitted to Kiff Analytical for analysis. <br /> ' The three samples were composited for analysis, and unfortunately, were composited with <br /> one sample from stockpile SP2-West, which may have been excavated from the southern <br /> dispenser area on 01 September 1998. The laboratory analysis indicated that the soil in the <br /> ' two stockpiles was impacted by low concentrations of total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g), low concentrations of benzene and toluene, and moderate <br /> concentrations of total petroleum hydrocarbons quantified as diesel (TPH-d). <br /> Installation of Upgraded UST System and Dispenser Islands <br /> ' Installation of a new UST south of the Operations/Mini-Mart building was initiated on 15 <br /> July 1998. Approximately 350 compacted cubic yards of apparently "clean" soil were <br /> ' reportedly excavated and stockpiled at the east end of the Operations/Mini-Mart building and <br /> was later designated stockpile "SP4". The new UST excavation was approximately 35 feet <br /> in length, 15 feet in width and 18 feet in depth. <br /> ' Approximately 115 cubic yards of clean soil were excavated from new trenching advanced <br /> for the upgraded dispenser system. The new trenching connected the ASTs located at the <br /> south end of the property with the new dispensers. This soil was also presumed to be"clean" <br /> and stockpile east of the new line and sump location. <br /> • Also the new dispenser system installation from the AST and UST generated soils which <br /> 1 <br />