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• <br />' - ' ' .,Site,Background Information y. <br /> WELDON CHURCH PROPERTY <br /> 104 West Beverly Place,Tracy; California <br /> F. samples -collected from.total-depth in both boririgs, at a'concentration of 0.012.mg/kg 1No other ; <br />' target analytes were detected In the samples analyzed. i <br /> 'water samples were analyzed TPH-g and,BTEXcompounds were detected,only <br /> Seventeen ' <br />' in the grab ground water samples collected at water-table depth,(approx imately'l0 feet bsg)"and at, <br /> total depth of borings B 17 and B-1 8.,The highest concentrations of contaminants were.detected in <br /> the water table sainples, at 160,000-micrograms per liter(µg/l) TPH-g-in sample B17-1•; and 5,600 <br />' µg11,benzene, 14,000 µg/1 toluene, 3,200 µg11 ethylben2ene and 12,000 :µg/l lxylenes in sample <br /> 1318-1.At total depth,maximum TPH-g concentration was 3,900,µg/1(1318-2);•however;the BTEX <br /> concentrations were considerably lower;benzene was notdetected,maximum toluene concentration• ' <br />' was 3.8 µgll (1318'-2), maximum ethylbenzene concentration was 2.2 µg/1 (B 1.7-2).and maxi'm'um. ; <br /> xylenes concentration was.16.8 µg/1(B 18-2). No other target analytes were detected in the samples ; <br /> analyzed. r ` <br /> A total of 24 soil borings have.been advanced on and' off the site, seven of which have-been <br />' .completed as groundwater monitoring wells,.providing data concerning hydrocarbon impact on soil <br /> and ground water, soil composition, and ground water flow direction. Laboratory analysis of soil <br /> samples collected from monitoring wells and soil probe borings constrain the plume of impacted soil.. <br />' • to the'immediate vicinity ofthe`formerUST excavation.The lateral extent of impacted ground water. <br /> appears to be delineated in all directions from,the former UST excavation. Laboratory analysis of, <br /> ground water samples collected north-of the: former UST:excavation, from well. MW-4, have <br /> I consistently detected,total petroleum hydrocarbons quantified as gasoline.(TPH-g),benzene,toluene, <br /> ethylbenzene and total xylenes(BTEX) and have generally detected.the sample analytes in samples <br /> from MW-1. These detections were not confirmed north.of well MW;-4 with additiorlal:soil'borings <br />' toward the.north, east and west of MW-4. <br /> ., .' _ V •' .' ,' 1`. _ ' ' •. .. ,' a `' i • <br /> 1. <br /> Advanced GeoEnvironmental,Inc: ` <br />