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' Pornho Property <br /> Subsurface Investigation Report <br /> Page: 4 <br /> Geo ir e a oratory Water Sam le Results (July 6, 1999 <br /> Sample LD. TEPH Gas I Benzene Toluene E-Benzene Xylenes MTBE <br /> ' <br /> 13-9-3311,0 ND 0.2 1.2 2.8 ND 4.8 *ND <br /> B-10-1TH20 ND 6.5 33 49 170 470 *ND <br /> 13-11-23'H20 ND 0.8 6.2 5.1 41 19 *ND <br /> B-12-16'H20 ND 1 0.7 2.1 4.4 22 5.5 *ND <br /> *conlinned by method 8260 ND=Non Detect <br /> Gasoline&Diesel Reported as nig/L BTEX&MTBE Reported as p,-/L <br /> Y, On July 20, 1999 three groundwater-monitoring wells were installed at the <br /> perimeter of the site (located north of B-10, east of B-12 and southwest, up <br /> gradient, of the former underground fuel tank). Soil samples were collected at 10 <br /> feet in depth from each boring during drilling. Laboratory analysis of the three soil <br /> samples were non-detect for gasoline, BTEX, and MTBE. <br /> ' The three wells were monitored, depth to water measured, and water samples <br /> collected for laboratory analysis on July 23, 1999. The analytical laboratory <br /> reported non-detectable concentrations of gasoline, BTEX, and MTBE. <br /> i <br /> Laborato Soil Sample Results J ly 20, 1999 <br /> Sample I.D. TEPH Gas Benzene 'toluene E-Benzene Xylenes MTBE <br /> ' MW-1-10' NA ND ND ND ND ND ND <br /> MW-2-10' NA ND ND ND ND ND ND <br /> MW-3-10' NA ND ND ND ND ND ND <br /> ' . ND=Non Detect NA=Not Analyzed <br /> Gasoline&Diesel Reported as nlg/Kg BTEX&MTBE Reported as lig/Kg <br /> 1 Laboratory Well Water Sample Results (July 23, 1999 <br /> Sample I.D. TEPH Gas Benzene Toluene E-Benzene Xylenes MTBE <br /> ' MW-1 NA ND ND ND ND ND ND <br /> MW-2 NA ND ND ND ND ND ND <br /> MW-3 NA ND ND ND ND ND ND <br /> ND=Non Detect NA=Not AnalyzedGasoline&Diesel Reported as mg/L 13TEX&MTBE <br /> ' Reported as Ng/l, <br />' 2.1 Drilling <br />' Permits were obtained as necessary for all wells (including borings) before <br /> drilling began. The soil boring was accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight auger no less than 3 1/4- <br /> inch i.d. and S 7/8 o.d. Geoprobe' Systems was used for a preliminary phase of <br /> sampling. <br />' All drilling equipment was thoroughly steam-cleaned before drilling began, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> prevent cross contamination. <br /> a <br />