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05 December 2007 <br /> AGE-NC Project No. 97-0327 <br /> Page 7 of 8 <br /> 3.5. 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 and sampling equipment will be pressure <br /> washed prior to starting the boring. <br /> 3.6. GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with CVRWQCB and.CSEMD <br /> guidelines. <br /> 3.6.1. Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator.Water level data will be recorded to the nearest 0.01 <br /> foot from a reference point marked of the top of the PVC well casing. Before and after each use,the <br /> electric oil/water level indicator will be washed in an Alconox solution and rinsed with water. <br /> 3.6.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling,the well will be purged utilizing <br /> either a submersible pump. inertia pump or by hand bailing to ensure that the ground water sample <br /> is representative of the formation, rather than water standing in the well casing. The well will be <br /> purged until: 1) a minimum of three casing volumes is removed from the well; and/or 2) the <br /> field-measured ground water parameters pH,temperature and electrical conductivity have stabilized. <br /> However, if a well is purged dry prior to evacuating three casing volumes, a ground water sample <br /> will be collected following 80 percent recovery of ground water level within the well or within <br /> 8-hours of well evacuation. <br /> Purge water and decontamination water generated during the ground water sampling activities will <br /> be contained in DOT-approved drums which will be appropriately labeled for storage. Drums <br /> containing purge water will be stored on-site pending appropriate removal and disposal. <br /> 3.6.3. Sample Withdrawal <br /> Water samples will be collected from the monitoring well using a disposable polyethylene bailer or <br /> Advanced GeoEnvironmental,Inc. <br />