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J � <br /> 08 August 2001 <br /> AGE-NC Project No 99-0657 <br /> Page 9of10 <br /> 4 5 WELL DEVELOPMENT AND SURVEY <br /> Development of the proposed wells will consist of a combination of balling with a stainless steel <br /> bailer to remove the major portion of fine-grained sedinient from inside the well, surging to flush <br /> out or draw in sediment from the filter pack and additional ground water evacuation(purging) with <br /> a submersible pump to finish the removal of fine-grained sediment Developmental purging activities <br /> will be continued until field parameter (pH, electrical conductivity, and temperature) readings have <br /> stabilized and purged water is visually sediment-free The proposed wells will be surveyed relative <br /> to the closest City of Lodi benchmark by a licensed surveyor <br /> 4 6 EQUIPMENT DECONTAMINATION <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox All down-hole drilling and sampling equipment will be pressure <br /> washed prior to starting each boring <br /> • 4 7 GROUND WATER MONITORING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with PHS-EHD guidelines (San <br /> Joaquin County Public Hearth Services Environmental Health Division Well Standards) and <br /> C VRWQCB guidelines (Tri-Regional Water QuaWy Control Board Recommendations for <br /> Preliminary Investigations and Evaluation of Underground Storage Tanks) <br /> 4 7 1 Static Water Level Measurements <br /> Prior to all ground water purging and sampling, static water levels in each well will be measured <br /> using an electric water level indicator Water level data will be recorded to the nearest 0 01-foot from <br /> a reference point marked on the top of each PVC well casing Before and after each use, the <br /> measurement device will be rinsed with clean tap water <br /> 4 7 2 Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, each well will be purged using <br /> a bailer or submersible pump to ensure that the sample is representative of the surrounding aquifer <br /> ground water The well will be purged until 1) a minimum of three casing-water volumes is <br /> removed from the well, and/or 2) the field-measured ground water parameters have stabilized <br /> Advanced GeoEnvironmental,Inc <br />