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umhos/cat and are calibrated daily. pH meters are read to the nearest±0.I pH units and are calibrated daily. Temperature is read to the crest .1 'F.Collected fien of ld data during parameter meters will follow manufacturers specifications. purging activities will be entered on the Well Sampling Field Data Sheet. a 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°10 of static water level is estimated, or observed to exceed a two hour duration, a sample will be collected when sufficient�e W metsis ot�aurged dry such thatlthe for echarge parameter. eacauses Attempts will be made so P 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. Volatile organic groundwater samples are collected so that air passage through the sample does not occur or is minimal (to prevent volatiles from being stripped from the 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) is positioned against theameniscus, and the cap absence of an aon bserew nce the sample is inverted and the bottle lightly ppm 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. Quality Assurance/Quality Control Objectives The sampling and analysis procedures employed by Exceltech for C ro dwatguidelines. er sampling and monitoring follow quality assurance/quality control (QAIQ ) EXCF-LTECH, INC. Groundwater Sampling Protocol Latest Revision: May 3, 1991