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MIN assessing sufficient purging. Purging is continued until all three physical parameters have stabilized. Specific conductance (conductivity) meters are read to the nearest±10 umbos/cm and are calibrated daiiy• pH read to the nearestmeters are read to the 0.1 °F.earest Calibration on of physI pH units ical are calibrated daily. Temperature is parameter meters will follow manufacturer's specifications. Collected field data during purging activities will be entered on the Well Sampling Field Data Sheet. In Ijw yield formations, the well is purged such that the "standing" water is removed and the well is allowed to recharge. (Normal field measurements will be periodically recorded during the purging process.) In situations where recoveryto 80% of static water level is estimated, or observed to exceed a two hour satnplenfoon e each parametere will . Attempts collected when sufficient volume is available for a Attempts will be made so the well is not purged dry such that the recharge rate causes the formation water to cascade into the well. In wells where free-phase hydrocarbons are detected, the free-phase portion will be bailed from the well and the estimated volume removed recorded. A groundwater sample will be collected if bailing reduces the amount of free-phase hydrocarbons to the point where they are not present in the well. Well sampling will be conducted using one of the aforementioned methods depending on the formation yield. However, if free-phase hydrocarbons persist throughout bailing, then a groundwater sample will not be collected. ir sage through the Volatile organic groundwater samples arecollected olatiles fromabeingsstripped from the does not occur or is minimal (to prevent samples): sample bottles are filled by slowly running the sample down the side of the bottle until there is a positive convex meniscus over the neck of the bottle; the teflon side of the septum(in cap) :s positioned against the meniscus, and the cap screwed o. tightly; the sample is inverted and the bottle lightly tapped. The absence of an air bubble indicates a successful seal; if a bubble is evident, the cap is removed, more sample is added, and the bottle is resealed. Chain-of-Custody Groundwater sample containers are labeled with a unique sample number, location, and date of collection. All samples are logged into a chain-of-custody form and placed in a chilled ice chest for shipment to a laboratory certified by the State of California Department of Health Services, RESNA INDUSTRIES, INC. Groundwater Sampling Protocol Latest Revision: October 23, 1991 I low — .��