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• 25 March 2003 <br /> AGE-NC Project No 98-0433 <br />' Page 3 of 5 <br /> 1 D,,,=Dn, - (tg * dl d,,) <br /> D,,,= Corrected depth to water <br />' Dm —Measured depth to water <br /> tg=Total thickness of free product <br /> dg=Density of free product (gasoline at —0 75 g/ml) <br />' d, Density of water(-10 gm/ml) <br /> The ground water elevations at the site ranged from 33 3-tYfeet(Mw to 34 47 feet(MW-7)above <br /> mean sea level (MSL) With the exception of well MW-6, the data indicates an average decrease of <br /> the ground water elevation in the wells of approximately 10 foot since the previous quarterly' <br />' monitoring event,the ground water elevation in well MW--6.increased by 0 08 feet Depth to ground <br /> water and calculated elevation date are presented in Table 1 , <br /> Based on ground water elevation data, a north-northeast trending ground water high, or ridge, was <br /> inferred to bisect the site (Figure 3) On the west side of this ridge was a northerly-trending trough, <br />' with a depression or low spot at the former USTs location,ground water gradients ranged between <br /> 0 004 ft/ft and 0 009 ft/ft East of the ridge, ground water flowed radially inwards in an easterly to <br /> northeasterly direction, at a gradient of approximately 0 004 f1/fl (Figure 3) <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the ground water samples collected from MW-1,MW-2, MW-6 and MW-8 <br /> at concentrations ranging from 250 micrograms per liter (µg/1) (MW-8) to 230,000 µg/l (MW-1) , <br />' TPH-d was detected in the groundwater samples collected from wells MW-1,MW-2,MW-3,MW-4 <br /> and MW-6 at concentrations ranging from 5,200 µg/1 (MW-4) to 24,000,000 µg/1 (MW-1) <br /> One or more BTEX compound were detected in samples MW-1, MW-2 and MW-6, the maximum <br /> concentrations were 250µg/1 benzene,200µg/1 ethylbenzene and 400µg/1 xylenes in sample MW-1 ` <br /> The fuel additive MTBE was detected in samples MW-1, MW-2 and MW-8 at concentrations of <br /> 2,600 µg/l, 6 7 µg/1 and 160 µg/l, respectively In addition,TBA were detected in sample MW-8 at <br /> 190µg/1 <br /> 1 <br /> Target a nalytes w ere n of d etected a t o r a bove laboratory r eporting 1 emits i n t he w ater s ample <br /> collected from the domestic well (DW-1) on-site <br /> - Advanced GeaEnvironmental,Inc <br /> 1 1 <br />