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' Site Background Information - Fernando's Place <br /> AGE-NC Project No. 00-0769 <br /> ' Page 6of7 <br /> 0.044 mg/kg total xylenes from SVE4-25. TAME was detected in soil samples collected <br /> ' from SVE4-25, SVE5-20, and SVE5-25 at concentrations as high as 0.046 mg/kg (SVE5- <br /> 25), and 1,2-DCA was detected in soil sample SVE5-25 at a concentration of 0.024 mg/kg. <br /> ' While, three soil samples from boring EW-1 were analyzed for the fuel additives; no <br /> contaminants of concern were detected. <br /> SITE CONCEPTUAL MODEL v1.0. <br /> ' The lateral and vertical extent of dissolved hydrocarbons and the fuel additive 1,2-DCA are <br /> not defined. The lateral extent of dissolved hydrocarbons exceeds the limits of the <br /> ' investigation to date and the likely extends east of EI dorado Street and north of the site <br /> beyond a distance of 350 feet. Higher concentrations of dissolved hydrocarbons and the <br /> fuel additive 1 ,2-DCA are focused near the former UST#3 area and lesser at former UST <br /> ' #1/#2 area. <br /> GROUND WATER DEPTH AND GRADIENT <br /> Based on quarterly ground water monitoring events conducted by AGE, depth to ground <br /> water at thero ert is approximately roximatel 20 feet to 30 feet below surface grade (bsg). The <br /> p p Y <br /> prevailing ground water flow direction is generally northeast, although flow directions may <br /> ' vary locally and seasonally. Depth to first encountered ground water at the property during <br /> the last quarter was measured to be approximately 27 feet bsg. <br /> ' HYDROGEOLOGIC UNITS <br /> ' Based on cross sections A-A'and B-B', AGE informally identified five hydrologic flow units, <br /> located between first encountered ground water and 199 feet bsg, as having significant <br /> intervals of apparently porous, coarser-grained soil separated by intervals of finer-grained, <br /> ' less permeable soil. Hydrogeologic Unit 1 (HU-1)was subdivided into three sub-units (HU- <br /> 1 Upper Zone, HU-1 Middle Zone, and HU-1 Lower Zone) that may not have significant <br /> barriers to vertical migration of contaminants. Generally, HU-1 Upper Zone was identified <br /> ' at depths between 25 feet (first encountered ground water) and 51 feet bsg; HU-1 Middle <br /> Zone was identified at depths between 48 feet and 75 feet bsg; HU-1 Lower Zone was <br /> identified at depths between 60 feet and 90 feet bsg. Hydrogeologic Unit 2 (HU-2) was <br /> ' identified at depths between 112 feet and 125 feet bsg and consists primarily of a <br /> continuous layer of sand. Hydrogeologic Unit 3 (HU-3) was identified at depths between <br /> 140 feet and 160 feet bsg and consists primarily of a continuous layer of sand. <br /> ' Hydrogeologic Unit 4 (HU-4) was identified at depths between 160 feet and 175 feet bsg <br /> and consists of a locally contained layer of sand. Hydrogeologic Unit 5 (HU-5) was <br /> ' Advanced GeoEnvironmental,Inc. <br /> t <br />