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i I14 February 2000 • AGE-NC Project No 96-0254 Page 5 of 10 26 SOIL LOGGING During drilling, auger returns were monitored for the presence of organic vapor using an organic vapor meter (OVM)equipped with a photo-ionization detector(PID Thermo Environmental 580A, 10 0 eV, calibrated to isobutylene) Auger returns were placed on plastic and stored on the western edge of the site, pending laboratory analysis IDuplicate soil samples were extruded from their sleeve and screened for the presence of organic vapor using the OVM The OVM readings were recorded on boring logs The soil was manually and Ivisually described in accordance with the USCS (see Boring Logs, Appendix A) 2 7 MONITORING WELL SURVEY I The casing elevations of each well installed for the Curtiss-Pontiac UST investigation were surveyed relative to a bench mark at the southern portion of the Highway 205 off ramp to Grant Line Road On 30 December 1999, a California state-licensed survey engineer from Baumbach & Piazza, Inc � . surveyed a reference point on the top of each ground water monitoring well at the site to the nearest 0 01-foot relative to the City of Tracy Bench Marks and Description at 35 00 feet above mean sea level (msl) The results of the monitoring well survey are contained in Table 1 The surveying report (Baumbach& Piazza) is presented in Appendix C 2 8 GROUND WATER DEPTH MEASUREMENT AND PURGING On 07 December 1999, a Solinst water level meter was used to measure the depth to ground water in each well relative to the top of the well casing After ground water depth measurements were collected, monitoring wells were purged using a two-stage submersible pump A minimum of 3 well-volumes of water were purged from all wells on the site Five gallons of ground water were evacuated from wells MW-1B and MW-2B, MW-3, MW-4, MW-5 and MW-6 Twelve gallons of ground water were evacuated from wells MW-lA and MW-2A Four gallons of ground water were evacuated from well MW-7 I Temperature, pH and conductivity of the purged water were measured at regular purge-volume intervals in all wells The field data were measured with an ICM model 52200 water analyzer Logs of the field data are included in Appendix D Purged water was stored on-site in labeled 55-gallon Idrums IAdvanced GeoEn.ironmental Inc