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q " •Ripona Market <br /> Subsurface Soil & Groundwater Investigation II <br /> Page- 2 <br /> Table of Laboratory Sample Results (February 11, 1999 <br /> Sam le I D Gasoline I Benzene I Toluene E-Benzene I Xylenes 8260 <br /> TK 1-S 15' ND ND ND ND ND ND <br /> TK1-N 13' ND ND ND ND 47 ND <br /> TK2-S 13' ND ND ND ND ND ND <br /> TK2-N@ 15' ND ND ND ND ND ND <br /> SP-1 ND ND ND ND ND 190 MTBE, 1200 t esti <br /> SP-2 ND ND ND ND ND ND <br /> ND=Non Detect Gasoline in mg/Kg 8260 inµg/Kg <br /> On January 31, 2000 M J Kloberdanz & Associates drilled a single soil boring to <br /> 30 feet in depth Groundwater was measured at 29 feet below grade surface (bgs) <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 15 <br /> foot sample contained only 19 µg/Kg of xylenes MTBE was present at 25 and 30 <br /> • feet in depth The sample with the highest concentration of MTBE, B-1-25', was <br /> analyzed by method 8260 for all of the oxygenated compounds and found to <br /> contain 960 µg/Kg of MTBE <br /> The groundwater sample was obtained by driving a hydropunch type well screen <br /> from 30 to 34 feet in depth The water sample contained low levels of Toluene, <br /> Xylenes, and MTBE at 10 µg/L <br /> Table of Laboratory Sample Results 1/31/00 <br /> Sample I D Gasoline Benzene Toluene I E-Benzene I Xylenes MTBE 8260 <br /> B-1-10' ND ND ND ND ND ND NA <br /> B-1-15' ND ND ND ND 19 ND NA <br /> B-1-20' ND ND ND ND ND ND NA <br /> 13-1-25' ND ND ND ND ND 1300 960pgLKg <br /> B-1-30' ND ND ND ND ND 170 NA <br /> B-1-142O ND ND 0 4 ND 1 3 NA 10 <br /> ND=NON-DETECT NA=Not Analyzed <br /> 2.0 WORK PLAN <br /> M J Kloberdanz & Associates proposes to drill 3 soil borings in the vicinity of the <br /> former underground tanks (Figure 2) to a depth at least ten feet below groundwater (40 <br /> feet) All three borings will be completed as 2-inch groundwater monitoring wells The <br />