Laserfiche WebLink
1 <br />' • 21 December 2002 <br /> AGE-NC Project No 99-0559 <br />' Page 4 of 8 <br />' HU 1 and HU2 <br /> During the September 2002 sampling event, the depth to ground water from monitoring wells <br />' MW-1,MW-3,MW-4,and MW-5A through MW-8A ranged from 60 80 to 62 12 feet below casing <br /> grade However, the depth to ground water(62 00 feet) at well MW-3 was affected by the presence <br /> of free product, the depth was recalculated (61 38 feet) utilizing the measured thickness of free <br />' product (approximately 10 inches) in well MW-3 <br />' DW= Corrected depth to water <br /> Dm =Measured depth to water <br />' tg = Total thickness of free product (-0 83 foot) <br /> dg Density of free product (gasoline at —0 75 g/ml) <br /> d,N=Density of water(-10 gm/ml) <br />' Ground water elevation data collected from monitoring wells MW-1 MW-3 MW-4 and MW-5A <br /> through MW-8A ranged between 36 90 feet(MW-3)and35 86 feet(MW-7A)below mean sea level <br />' (MSL) Ground water elevation decreased approximately 8 feet over the last quarter The top of the <br /> ground water table was within the screened intervals of the wells <br />' At the time of the September 2002 monitoring event, the potentiometnc surface based on HU1 and <br /> HU2 wells inferred an asymmetric, west-southwest flowing ground water nose with a hydraulic <br />' gradient of 0 005 ft/ft at the former UST location (Figure 3), faster ground water flow, with a <br /> gradient of 0 02 f1/ft, was inferred along the northern limb of the nose <br /> HU3 and HU4 <br /> I Ground water elevation data collected from monitoring wells MW-513 through MW-813 ranged <br /> between 36 86 feet(MW-513) and 36 10 feet(MW-8B)below MSL,based on the monitoring wells <br /> screened in HU3 and HU4, ground water was inferred to be flowing toward the northwest with a <br /> Ihydraulic gradient of 0 005ft/ft (Figure 4) <br /> HU5 <br /> I Within the upper portion of HU5 (Upper HU5), screened between 125 and 135 feet bsg, ground <br /> water elevation data collected from monitoring wells MW-5C through MW-7C ranged between <br /> 36 96 feet(MW-8C)and 37 32 feet(MW-7C)below MSL, at the former UST release ground water <br /> was inferred to be flowing toward the north-northwest with a hydraulic gradient of 0 0067ft/ft <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />