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15 September 1999 <br /> AGE-NC Project No. 97-0369 <br /> Page 8 of 9 <br /> 4.4. WELL DEVELOPMENT <br /> Development of the proposed wells will consist of a combination of bailing with a stainless steel <br /> bailer to remove the major portion of fine-grained sediment 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. <br /> 4.5. 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 augers will be pressure washed prior to <br /> starting the boring. <br /> 4.6. GROUND WATER MONITORING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with PHS-EHD guidelines (,San <br /> Joaquin County Public Health Services Environmental Health Division iGell Starnlards) and <br /> CVRWQCB guidelines (Tri-Regional mater Quality Control Board Recommendations for <br /> Preliminary Investigations and Evaluation of Underground Storage Tanks) sampling protocols. <br /> 4.6.1. Static Water Level Measurements <br /> Prior to all around seater purging and sampling, static eater 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 /> 4.6.2. Well Evacuation <br /> Subsequent to measurement of depth to seater 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 seater. The well will be purged until: 1) a minimum of three casing volumes is removed from <br /> the well, and/or 2) the field-measured ground water parameters have stabilized. However, if the well <br /> is purged dry prior to evacuating three casing volumes, a ground water sample will be collected <br /> Advanced GeoEnN iron mental,Inc. <br />