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wassessing sufficient purging. Purging in is continued until all three physical parameters have stabilized. Specific conductance (conductivity) meters are read to the nearest±10 umhos/cm and are calibrated daily. pH meters are read to the nearest f0.1 pH units and are calibrated daily. Temperature is read to the nearest 0.1 °F. Calibration of physical - parameter meters will follow manufacturer's specifications. Collected field data during purging activities will be entered on the Well Sampling Field Data Sheet. In low 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 recovery to 80% of static water level is estimated, or observed to exceed a two hour duration, a sample will be collected when sufficient otthe we leist not purged drYrsuch thatlthe eachorecharge a ea metercauses Attempts will be made the formation water to cascade into the well. portion In wells where free-phase hydrocarbons are detected, the e A grow dwater bailed from the well and the estimated volume removed recorded.-phase ho ded.hydrocarbons w the sample will be collected if bailing reduces the amount of free-phaseY 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. Volatile organic groundwater samples are collected so that air passage througthe sample does not occur or is minimal (to prevent volatiles from being stripped from samples): sample bottles are filled by slowly running the sample down the sidle of the lon bottle until there is a positive convex meniscus over the neck of the bottle; ' side of the septum (in cap) is positioned against the meniscus, and the cap screwed on 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. Chairs-of-Custod, Groundwater sample containers are labeled with a uniquechain-of-custody form and ple number, cat plaed and date of collection. All samples are logged into a chain Y chilled ice cltest 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