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+! ILi <br /> pona Market <br /> Subsurface Sol] & Groundwater Investigation III <br /> Page: 2 <br /> soil excavated during the underground storage tank removal and closure Due to the <br /> lack of obvious contamination, Division staff permitted the use of the soil as fill in the <br /> tank excavation <br /> Table of Laboratory Sample Results (February 11, 1999) <br /> Sample 1 D Gasoline Benzene Toluene E-Benzene Xylenes 8260 <br /> TK I-S 15' ND ND ND ND ND ND <br /> TY,I-Na 13' ND ND ND ND 47 ND <br /> TK2-Sna 13' ND ND ND ND ND ND <br /> TK2-N o 15' ND ND ND ND ND ND <br /> SP-1 ND ND ND ND ND 190 MTBE 1200 t Bua <br /> SP-2 ND ND ND ND ND ND <br /> ND=Non Detect Gasoline m mg/Kg 8260 mµg/Kg <br /> On January 31, 2000 M J Kloberdanz & Associates drilled a single exploratory <br /> boring to 30 feet in depth Groundwater was measured in the borehole at 29 feet <br /> below grade surface (bgs) The former tank excavation had been filled with the <br /> previously excavated soils and capped with about eight feet of pea gravel so lithologic <br /> sampling started at ten feet in depth The boring was located near the center of the <br /> backfilled tank excavation (Figure 2 Site Map) <br /> Laboratory soil samples were collected every five feet, below the imported gravel fill, <br /> for laboratory analysis to define the contaminate concentrations of sods used as fill in <br /> the tank pit The ten and twenty foot samples were non detect for all compounds <br /> analyzed 19 4g/Kg of xylenes was detected in the 15-foot sample MTBE was <br /> detected at 1300 mg/kg in soil samples collected at 25 and 170 µg/kg at 30 feet in <br /> depth The 25-foot sample (B-1-25) was analyzed by method 8260 for all of the <br /> oxygenated compounds and found to contain 960 µg/Kg of MTBE <br /> The groundwater sample was obtained by driving a hydropunch type well screen from <br /> 30 to 34 feet in depth The water sample contained 0 4 µg11 Toluene, 1 3 µg/1 Xylenes, <br /> and 10 µg/L MTBE <br /> Table of Laboratory Sample Results (1/31/00) <br /> am <br /> Sle I D TGasoline Benzene I Toluene E-Benzene Xylenes I 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 /> B-1-25' ND ND ND ND ND 1300gSXg 960 <br /> 8-1-30' ND ND ND ND ND 170 NA <br /> B-I-H20 ND ND 0 4 ND 1 3 NA 10 <br /> ND=NON-DETECT NA=loot Analyzed <br /> On July 27, 2000 M J Kloberdanz & Associates drilled 3 soil borings in the vicinity of <br /> the former underground fuel tanks and the previously disclosed contamination (Figure <br /> . 2)to a depth more than ten feet below groundwater All three borings were completed <br />