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d <br /> F <br /> r, <br /> 13 July 1992 <br /> (GeOAudit CV 55-59 E2-1.32) <br /> Page 6 of 8 <br /> On of the <br /> Southeast, but this is probably an artifar ebly hbelmore lirregular <br /> data <br /> points. The contour pattern would pThe levels Of <br /> Dints were <br /> available. and SB-2-20 seem to <br /> if additional data p SB-2-10, <br /> the northwest <br /> les SII-1 -10, <br /> contamination in samp point is located near of the <br /> suggest that the main leak p <br /> carnet of the vault, but this may also be due to the spacing <br /> be <br /> data p 600 mg/kg were <br /> Dints. A <br /> second source <br /> TPH levels aslochigh as 15,ted on the 0uth side o <br /> 3-10. Lower levels were encountered in <br /> the vault near SB and 2, 170 mg/kg, <br /> encountered in sample SB- mg/kg <br /> SB-1-30 (9,000 g/ g <br /> samples mi-4 and <br /> in the central portion of the vault between these two <br /> respectively ) ores 3 and 5) . <br /> possible lea's points (Fig <br /> 5.0 VOLU14E OF CONTAMINATED BOIL <br /> For the purpp5e of estimating <br /> the volume of contaminated soil, <br /> ensions <br /> Figure 5 was gridded intthe <br /> Figures 3 and 4 were then <br /> o four sections and then <br /> plume within each section were measured. Figwithin each <br /> used to estimate the tss 0 <br /> imensions were then lmultiipinated ied tiodetermine <br /> contaminated so <br /> section, and the three d <br /> the volume of contamiil within each sec <br /> calculations are shown below: = 3000 cu ft <br /> Area south of vault: 20 ft x 15 ft x 10 ft = 4000 cu ft <br /> Area beneath vault: 25 ft x 10 ft x 16 ft _ 5250 cu ft <br /> Area north of vault: 25 ft x 14 ft x 15 ft ` 1200 cu ft <br /> Area west of vault: 10 ft x 15 ft x B ft <br /> Total 13,450 cu ft <br /> The total volume of contaminated soil is therefore approximately <br /> 50o cubic yards. <br /> 6.o CONCLUSIONS <br /> at� �ns conducted in August 1991 and January from the <br /> Field investig in soil <br /> 1992 indicate that an <br /> unauthorized ccurred,of resulting petroleum <br /> concrete storage vault has Total <br /> of the vault. have been <br /> contamination in the vicinityh as 22,400 mg/kg <br /> hydrocarbon contamination levels as high <br /> detected at sic <br /> hallow depths beneath the risen at Volatile law levels tin <br /> hydrocarbon (BTEX) contamination was p <br /> f been detected in more recent sampling. <br /> ------- -Aug-- -Aoust-,1991 but has-n- - - -- - - -- <br /> Contaminated soil from the borings is stared in- severa- -l drums on <br /> ~ should 1 Y e the Mostcos <br /> aciwhichever remedpis ated on etaeffective <br /> site. This soil shou <br /> at an appropriate f <br />