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' 22 August 2000 <br /> AGE-NC Protect No 95-0144 <br /> 'Page 3 of 8 <br /> I 1 <br /> Total lead by EPA Method 6010B <br /> ' 2 13 Equipment Decontanunation <br /> Prior to sample collection, Geoprobe soil sampling equipment was thoroughly rinsed with clean <br /> water after washing with a solution ofAlconox Geoprobe rods were thoroughly cleaned prior to soil <br /> ' probe boring advancement <br /> 1 214 Logging <br /> During drilling activities, sample duplicates were monitored for the presence of organic vapor using <br /> i an organic vapor meter equipped with a photo-ionization detector (PID Thermo Environmental <br /> 580A, 10 0 eV, calibrated to isobutylene) and were visually described on boring logs in accordance <br /> ' with the Unified Soil Classification System(USCS) Boring logs are included as Appendix A <br /> r <br /> ' 2 1 5 Boring Abandonment <br /> The probe borings were abandoned by backfilling with a neat portland cement grout The cement was <br /> �I tremmied into boring 15B-8 and was introduced by free fall into the remaining borings A grout <br /> inspection had been scheduled with the PHS-EHD <br /> 2 2 MONITORING WELL PURGE PROCEDURES <br /> ' On 09 and 10 May 2000, a Solinst water level meter was used to measure the depth to ground water <br /> in 15 monitoring wells at the subject site relative to the tops of the well casings The ground water <br /> elevations and hydraulic gradient were determined from these data (Table 1) <br /> On 09 and 10 May 2000,monitoring wells MW-1, MW-2, MW-4,MW-5, MW-8, MW-11, MW-12 <br /> MW-13, MW-18, MW-19A MW-19B, MW-20A, MW-20B, MW-21A and MW-2 IB were purged <br /> using submersible purge pumps Monitoring was performed in accordance with the revised <br /> monitoring schedule established at a 03 April 1998 meeting with the PHS-EHD The purge pumps <br /> I were decontaminated prior to purging each well by pumping an Alconox solution followed by <br /> pumping tap water Approximately three well-volumes of water (approximately eight to sixty <br /> gallons) were removed from each of the purged wells Temperature, pH and conductivity of purged <br /> water were measured at regular purge-volume intervals using a Hydac water analyzer The recorded <br /> i <br /> 1 Advanced GeuEnvtrunmental,Inc <br />