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i <br /> iY <br /> • 14 December 2000 <br /> AGE-NC Project No 99-0559 <br /> Page 6 of 1 I <br /> I cement The grout was placed by pumping through the center of the auger while the augers were <br /> incrementally raised The as-built monitoring well designs are presented in Appendix A <br />' 3 2 4 Equipment Decontamination <br /> All hollow stern augers were steam-cleaned prior to advancement in each boring, tools and brass <br /> sleeves used were cleaned by the procedures described in section 3 4 <br />' 3 2 5 Well Elevation Surveying <br /> Y g <br /> IThe casing elevation of each monitoring well were surveyed relative to City of Stockton Bench Mark <br /> 4 362 to the nearest 0 01 feet in February 2000 by a California state-licensed survey engineer from <br />' Baumbach & Piazza, Inc The survey data is summarized in Table i The surveying report is <br /> presented in Appendix B <br /> I• 3 3 QUARTERLY MONITORING AND SAMPLING PROCEDURES <br /> On 02 February 2000, wells MW-1 through MW-4 were purged and sampled Well MW-2 was not <br /> sampled due to free-product observed in the well Monitoring well MW-2 was then purged and <br /> sampled on 25 February 2000 On 09 September 2000, ground water monitoring and sampling were <br />' performed on wells MW-I and MW-4 Additionally, free-product gaging and extraction has been <br /> on-going on a frequent basis <br /> 3 3 1 Monitoring Well Purge Procedures <br />' On 02 February 2000 and 01 September 2000, depth to ground water was measured in each well <br /> from the tops of the well casings (well heads) at the site to the nearest 0 01-foot utilizing a Solanst <br /> water level meter The ground water elevation in each well at the site were calculated by subtracting <br /> the measured depth to ground water from the surveyed well-head elevation(Table 3) Ground water <br /> elevations were plotted and contoured on a scaled site neap <br /> After water levels were measured, approximately 9 gallons of ground water (a minimum of three <br /> casing water-volumes per well) were removed from the wells utilizing a submersible pump <br /> Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals <br /> from each well using a Hydac water analyzer Field data and logs are included with Appendix B <br /> Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking <br /> general public access <br />