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1 <br />' the well and be collected. To facilitateum in ur , a diaphragm or a <br /> P g gpump <br /> het pump is attached to a dedicated section of 314-inch polyethylene pipe <br /> A check valve is placed on the end of the pipe to prevent the entrance of <br /> air The pipe is lowered to the bottom of the well The purging <br /> procedures are the following- <br />' ■ Water levels are measured and recorded on the "Well Purging and <br /> Sampling" form prior to purging; <br />' ■ The volume of water standing in the well casing is calculated <br /> Then a minimum of five casing volumes is removed if the well is <br /> a high yield well. If the well is a low yield well, the water is <br /> evacuated until the well is dry <br /> ■ Samples are obtained for measuring the temperature,Ph, and <br /> specific conductance of the purged groundwater approximately <br /> once every casing volume Purging continues until these field <br />' water quality parameters stabilize to within + or - 10% <br /> Once the field water parameters stabilize, the groundwater is sampled <br /> using Teflon bailers Preparation of these bailers consists of <br /> ■ inspection of bailers for scratches, cracks, or defects, <br />��� ■ washing in phosphate-free soap, <br /> ii rinsing in organic-free distilled water, <br /> ■ air drying, <br />' ■ rinsing in organic-free distilled water, <br />' ■ air drying, <br /> ■ packaging in new polyethylene bags to minimize contact with <br />' airborne contamination during transport <br /> New cotton rope is used to lower the bailer to the water table The bailer <br /> is rinsed twice with formation water before filling sample containers <br /> Groundwater samples collected at the Stockton Scavenger site will be <br /> analyzed for the following <br /> ■ Volatile aromatic hydrocarbons by EPA Method 801518020, and <br /> ■ total petroleum hydrocarbons as gas and diesel <br /> 3-7 <br /> COMPANY CONFIOENTiAL TRADE SECRET AND PROPRIETARY N[FdRMATKM OF THE MARK GROUP INC 111 r <br />