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23 October 1995 <br /> AGE-NC Project No 95-0104 <br /> Page 2 of 5 <br /> bromomethane, was detected in soil sample MW4-45 at 0 43 pg/g (ppm) No other halogenated <br /> organics were detected in any of the samples analyzed <br /> IOn 4 April 1995, remediation well VW-1 was installed at the site near the center of the former UST <br /> The well was drilled to a total depth of 80 feet and completed as a 4-inch diameter remediation well <br /> with slotted casing from 22 to 72 feet TPH-g was detected in sample VW1-25 at a concentration of <br /> 14,000 ppm <br /> 3.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 26 April and 24 July 1995, the water level and total depth in each well was measured to the <br /> nearest 0 01 foot relative to the top of the casing using a Solinst water level meter (Table 1) Upon <br /> arrival at the site, monitoring wells MW-i through MW-4 were inspected for damage or tampering <br /> Each well vault was opened and the compression cap and well casing within each was observed for <br /> signs of wear or unauthorized entry All wells were in good condition and showed no signs of wear <br /> or tampering No free product was observed from this monitoring event <br /> The ground water surface elevation in each well was determined by subtracting the measured depth <br /> to ground water from the surveyed reference point elevation (Table 1) The ground water surface <br /> elevations for each well were plotted on a scaled site map, whereupon ground water surface elevation <br /> contours were generated (Figure 3) <br /> The volume of water in each well casing (i a well volume casing) was calculated by subtracting the <br /> measured depth to ground water from the total measured depth and multiplying the result by 0 163 <br /> gallons per foot for a two-inch well, or by multiplying the result by 0 650 gallons per foot for a four- <br /> inch well <br /> Alter water levels were measured, approximately 3 to 4 gallons of ground water(a minimum of three <br />' well volumes) was purged from MW-1 utilizing pre-cleaned PVC bailers Approximately 50-75 <br /> gallons of ground water was purged from MW-2 through MW-4 utilizing a Grundfos Redi-flow II <br /> submersible pump Temperature, pH and conductivity were measured at well volume intervals using <br />' an ICM model 52200 water analyzer Stabilization data and field logs are included in Appendix A <br /> Purged water was stored in 55-gallon drums stored on-site in an area inaccessible to the general <br /> public <br />