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assessing sufficient purging. Purging is continued until all three physical parameters <br /> have stabilized. Specific conductance (conductivity) meters are read to the nearest ±10 <br /> umhos/cm and are calibrated daily pH meters are read to the nearest ±0 1 pH units and <br />' are calibrated daily Temperature is read to the nearest 0 1 °F Calibration of physical <br /> parameter meters will follow manufacturer's specifications. Collected field data during <br /> purging activities will be entered on the Well Sampling Field Data Sheet. <br /> ' In low yield formations, the well is purged such that the "standing" water is removed <br /> and 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 <br /> Attempts will be made so the well is not purged dry such that the recharge rate causes <br /> the formation water to 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 estimated volume removed recorded A groundwater <br /> ' sample will be collected if bailing reduces the amount of free-phase hydrocarbons to the <br /> point where they are not present in the well. Well sampling will be conducted using <br /> one of the aforementioned methods depending on the formation yield However, if <br /> free-phase hydrocarbons persist throughout bailing, then a groundwater sample will not <br /> be collected <br /> ' Volatile organic groundwater samples are collected so that air passage through the <br /> sample does not occur or is minimal (to prevent volatiles from being stnpped from the <br /> ' samples) sample bottles are filled by slowly running the sample down the side of the <br /> bottle until there is a positive convex meniscus over the neck of the bottle, the teflon <br /> side of the septum (in cap) is positioned against the meniscus, and the cap screwed on <br /> ' tightly; the sample is inverted and the bottle lightly tapped. The absence of an air <br /> bubble indicates a successful seal; if a bubble is evident, the cap is removed, more <br /> sample is added, and the bottle is resealed <br /> Chain-of-Custody <br /> Groundwater sample containers are labeled with a unique sample number, location, and <br /> date of collection All samples are logged into a chain-of-custody form and placed in a <br /> chilled ice chest for shipment to a laboratory certified by the State of California <br /> Department of Health Services <br /> RESNA INDUSTRIES, INC <br /> Groundwater Sampling Protocol <br /> Latest Revision October 23, 1991 <br />