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12 June 2003 <br /> AGE-NC Project No 01-0827 <br /> Page 5 of 7 <br /> (cfm) An induced vacuum (negative pressure) of approximately 32 to 37 inches of water was <br /> measured in the piping between the blower and extraction wells <br /> Induced vacuum measurements of approximately 0 15 inches and 0 1 inches were measured at <br /> monitoring wells MW-1 and MW-3, at distances of 10 feet and 45 feet, respectively, from the <br /> extraction wells Hydrocarbon concentrations measured at the SVE exhaust utilizing a photo <br /> Iionization meter (PID) was measure at 36 parts per million (ppm) in February, and no detections <br /> during the subsequent events Field measurements are summarized in Table 2 <br /> 32 ANALYTICAL RESULTS OF SOIL-VAPOR SAMPLES <br /> ITPH-g, toluene and xylene compounds were detected in the SVE effluent sample collected on <br /> 16 January at concentrations of 27 micrograms per liter(µg/l), 0 35 µg/1 and 0 46 µg/l,respectively <br /> This sample was collected 24-hours after SVE start-up, representing the initial discharge of <br /> hydrocarbons TPH-g and BTEX compounds were not detected in the other SVE effluent air flow <br /> samples collected <br /> • The analytical results of SVE air flow samples are summarized in Table 1 The laboratory reports <br /> p �' eP <br /> (MAI Lab Numbers 03012515, 0302073, 0304403 and 0305207) quality assurance and quality <br /> control (QA/QC) reports and chain-of-custody forms are included in Appendix C <br /> 3 3 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> On 23 and 24 April 2003, depths to ground water in monitoring wells MW-1 through MW-6 and <br /> vapor wells VW-1, VW-2d, VW-3 and VW-5d ranged from 21 57 to 23 75 feet below the tops of <br /> the casings (btoc), the water table was approximately 10 feet above the screened intervals of wells <br /> IVW-2d and VW-5d and 36 feet above the screened interval of well MW-6 (Table 3) <br /> The ground water elevations and gradient were calculated and determined from depths to ground <br /> water data from monitoring wells MW-1 through MW-5 The ground water elevations at the site <br /> ranged from 11 40 feet (MW-3) to 12 06 feet (MW-2) below mean sea level (MSL) The ground <br /> water flow direction was inferred to be northeast at a gradient of approximately 0 005 ft/ft(Figure 3) <br /> I <br /> • <br /> Advanced GwEnvironmental,Inc <br />