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05 June 2003 <br /> AGE-NC Project No 99-0637 <br /> Page 3 of 7 <br /> I2 1 5 Monitoring Well Development <br /> On 24 February2003,monitoring wells MWS,MW9 and MW 10 were developed utilizing a stainless <br /> steel hand bailer and a two-stage submersible pump Groundwater was purged from each monitoring <br /> well until ground water was visually sediment free Approximately 20 gallons of water were <br /> I removed from each well Ground water temperature,pH and conductivity were measured at regular <br /> intervals during purging using an Oakton water analyzer Field sheets and data are included in <br /> AppendixB Purged water was stored on-site in properly labeled, 55-gallon DOT-approved drums <br /> 2 16 Well Head Survey <br /> On 22 April 2003, a California state-licensed survey engineer from Baumbach & Piazza, Inc <br /> surveyed the elevation at the top of the well casing of monitoring wells MW8,MW9 and MW 10 to <br /> the nearest 0 01-foot relative to City of Manteca Bench Mark #63 at 33 758 feet above mean sea <br /> level(msl) The results of the monitoring well survey are contained in Table I The surveying report <br /> (Baumbach& Piazza, Inc ) is presented in Appendix C <br /> 2 2 QUARTERLY WELL MONITORING PROCEDURES <br />' Theuarterl ground water monitoring event was performed on 27 February 2003 on ground water <br /> q Y <br />' monitoring wells MW I through MW 10 <br /> 2 2 1 Well Monitoring and Evacuation <br /> On 27 February 2003, the depth to ground water in all ten monitoring wells was measured from the <br /> I top of each well casing to the nearest 0 01 foot utilizing a Solinst water level meter Ground water <br /> elevation in each well was calculated by subtracting the measured depth to ground water from the <br /> surveyed casing elevation (Table 1) <br /> After water levels were measured, between 5 0 and 6 5 gallons of water (a minimum of 3 casing- <br /> water volumes per well)were purged from monitoring wells MW 1 through MW 10 using dedicated, <br /> disposable plastic bailers Groundwater temperature,pH and conductivity were measured at regular <br /> intervals during purging using an Oakton water analyzer Field sheets and data are included in <br /> Appendix B Purged water was stored in properly labeled DOT-approved 5 5-gallon drums and stored <br /> on-site <br /> i <br /> I <br /> Advanced GeoEavironmentai,Inc <br /> I <br />