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$ <br />the well is allowed to recharge. (Normal field measurements will be periodically <br />recorded during the purging process.) In situations where recovery to 80% of static <br />water level is estimated, or observed to exceed a two hour duration, a sample will be <br />collected when sufficient volume is available for a sample for each parameter. At no <br />time will the well be purged dry so that the recharge rate causes the formation water to <br />cascade into the well. <br />In wells where free -phase hydrocarbons are detected, the free -phase portion will be <br />bailed from the well and the volume removed recorded. A groundwater sample will be <br />collected if bailing reduces the amount of free -phase hydrocarbons to the point where <br />they are not present in the well. Well sampling will be conducted using one of the <br />aforementioned methods depending on the formation yield. However, if free -phase <br />hydrocarbons persist throughout bailing, then a groundwater samples will not be <br />collected. <br />Groundwater sample containers are labeled with a unique sample number, location, <br />product name and number, and date of collection. All samples are logged into a chain - <br />of -custody form and placed in a chilled ice chest for shipment to a laboratory certified <br />by the State of California Department of Health Services. <br />EXCELTECH, INC. <br />Groundwater Sampling Protocol <br />Latest Revision: March 28, 1990 <br />