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[ 3 <br /> w ■ Z1 INC- <br /> 3. The depth-to-groundwater will be measured frm the predetermined measure point on the well <br /> casing with a sounding tape and recorded to the nearest 0.01 foot. The time, day and other <br /> observations will be recorded in a notebook. A calculation of the volume of water in the <br /> wellbore will be made. <br /> 4. The groundwater temperature,pH and electrical conductivity will be measured with field <br /> instruments and recorded in a notebook. <br /> 5. A minimum of three to five well volumes will be removed from the wellbore with a pump or <br /> bailer. The purging rate will not be so great to cause the well to go dry or have the <br /> formation water cascade down the casing. If I iurging causes the well to be pumped dry, it will <br /> be allowed to recharge for up to 24 hours prio to sampling. If the well does not recharge <br /> within 24 hours, it will be considered to be a dry well. <br /> 6. The purged water will be dumped or pumped nto barrels onsite for holding prior to proper <br /> disposal. <br /> 7. After purging, the temperature, pH and electrical conductivity will be checked every 10 <br /> minutes until they stabilize. Stability will be achieved when two consecutive measurements of <br /> 0.5 units of pH are within two degrees Fahrenheit for temperature and within 5 percent of <br /> electrical conductivity measurement. <br /> 8. The water samples will be poured from the bailer or pump directly into sample bottles. For <br /> bottles without preservation,the cap and bottle will be rinsed two or three times with well <br /> water and filled, keeping the head space to ze o. For bottles with a preservation, no rinsing <br /> will be made and the sample bottle will be filed directly with minimum head space. <br /> 9. The samples will be placed in a cooler with d ice or blue ice for transportation to the <br /> analytical laboratory. <br /> 08420010.001 5 <br />