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y Ripona Market <br /> Vertical Groundwater Investigation&November 2003 Quarterly Report <br /> Page: 2 <br /> On January 31, 2000 M. J. Kloberdanz &Associates below lled a grade surface{bgs) <br /> ngle soil boring to <br /> 30 feet in depth. Groundwater was measured at 29 feet <br /> The former tank excavation had been filled with the previously excavated soils <br /> and topped with about eight feet of pea gravel so sampling started at ten feet in <br /> depth. The boring was located near the center of the backfilled tank excavation <br /> ` (Figure 2 Site Map). <br /> Laboratory soil samples were obtained every five feet, below the gravel layer, for <br /> laboratory analysis since contaminated soils were placed back in the tank pit. The <br /> ten and twenty foot samples were non-detect for all compounds analyzed. The <br /> 15-foot sample contained only 19 µg/Kg of xylenes. MTBE was present at 25 <br /> and 30 feet in depth. The sample with the highest concentration of MTBE, B-1- <br /> 25', was analyzed by method 8260 for all of the oxygenated compounds and <br /> found to contain 960 µg/Kg of MTBE. ' <br /> The groundwater sample was obtained by driving a hydropunch type well screen <br /> R i from 30 to 34 feet in depth. The water sample contained low levels of Toluene, <br /> Xylenes, and MTBE at 10 µg& <br /> Table of Laboratory Sample Results Q131/00 <br /> Sample I.D. Gasoline Benzene Toluene E-Benzene X lens MTBE 8260 <br /> ND ND ND NA <br /> B-1-10' ND ND ND <br /> ND 19 ND NA <br /> I B-1-15' ND ND ND ND ND ND NA <br /> B-1-20' ND ND ND <br /> ND ND ND ND 1300 960 <br /> B-1-25' ND ND 170 NA <br /> B-1-30' ND ND ND ND <br /> .. ND 0.4 ND 1.3 NA 10 <br /> B-1-H2O ND <br /> ND=NON-DETECT NA=Not Analyzed <br /> r-. <br /> ' On July 27, 2000 M.J. Kloberdanz & Associates drilled 3 soil borings in the <br /> vicinity of the former underground fuel tanks and the previously disclosed <br /> contamination (Figure 2) to a depth more than ten feet below groundwater. All <br /> ' three borings were completed as 2-inch groundwater monitoring wells. The wells <br /> were located around the fuel-island and former underground tanks to define the <br /> lateral limits of the soil and groundwater contamination. <br /> Three soil samples were obtained from each boring for laboratory analysis and <br /> included a sample from the capillary zone and any apparently contaminated areas <br /> above and/or below groundwater. Petroleum contamination was not present in <br /> any of the soil samples. However, MTBE was confirmed in boring MW-2 in the <br /> relatively high concentration of 1100 µg/Kg at 25 feet in depth. <br /> r~; <br /> 4 <br /> �i <br />