ARCHIVED REPORTS_XR0005469 - Laserfiche WebLink

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1.3 Site Contamination Findings Update The earlier Gallardo reflected findings and the deductions of Rafael L Gallardo, R G No 6834 for work completed in 1999 Information found in the report provided a limited definition of the petroleum hydrocarbon contamination Soil with pollutant levels up to 30,000 mg/kg of diesel range and 18,000 mg/kg of kerosene range petroleum hydrocarbon product were reported in the vicinity of the former 20,000 GA USTs Bonngs B-3 and B-5 were clean Higher concentrations of the potential floating diesel product were found by Gallardo in B-1 and B-2 at a similar depth as a "shallow water body" detected in B-4 which had a small amount of diesel (5,900 pg/L) and kerosene (4,300 pg/L) detected Sod samples collected by Barber during monitoring well installation and sod borings ' indicated soil contamination at 10 FT depth at MW-2 Only limited soil samples were analyzed by Barber at the shallow depths in other borings with effort to identify sod contamination directed at deeper level where apparent in drillings Contamination was identified earlier at the 25 to 35 FT bgs depths in the northeastern quarter of the site 1 3.1 Soil Lithology ' Findings described in Gallardo's May 24, 1999 report are quoted below, in whole, for direct comparison with findings by Stellar Environmental Services/ D K Barber P E ' Associates "The site soils encountered beneath the site property during drilling consisted of brown ' silty sand to a depth between 8 to 10 feet bgs followed by an underlying layer of gray to brown sand At a depth of between 12 and 13 feet bgs, a brownish-grey to brown clayey ' sand to silty sand was encountered ' At the time of excavation, November 22, 2004, petroleum hydrocarbon odors and sod discoloration were noted in sod samples collected from trenches E-1, E-3, and E-4 ' Analytical results later confirmed petroleum hydrocarbons within the sod 4