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VZ1 INC be conducted under the oversight of a State of Califor iia Registered Geologist. All geologic logs and associated field work will be conducted in accord ce with standards established by the Tri- Regional Board Guidelines for Hydrocarbon Site Ass ssment and Remediation (CRWQCB, 1991). After each monitoring well is constructed, an inspecti n will be conducted by lowering a clean bailer to the groundwater surface and retrieving a gro indwater sample. The water in each monitoring well will be examined for floating petrol un product, sheen or odor. If floating product is detected,the well will not be developed or sampled. If the well does not show floating product, it will be developed by surging with a vented surge block and pumping unit until approximately three to five well volumes are purged and stable field readings of pH, specific conductivity and temperature are obtained. After groundwater returns to approximately 90 percent of static groundwater elevation, the well will be sampled using a clean bailer and the water will be transferred to laboratory-sterilized glass receptacles. Groundwater samples will be ,�- analyzed for total petroleum hydrocarbons as gasoline and diesel fuel using USEPA Test Method j 8015(m) and for BTEX using USEPA Test Method 602. Purged groundwater and drill cuttings will be stored c nsite in 55-gallon drums. Wellhead elevations and horizontal coordinates will be surveye using appropriate methods to an accuracy of 0.01 foot vertical and 0.1 foot horizontal. All elev tions will be tied to a United States Coast and Geodetic Survey or United States Geological Survey benchmark. All survey notes will be provided, including distances measured and any verti al or horizontal angles measured. All surveying work will be conducted under the oversigh of a State of California Registered Civil Engineer or Land Surveyor. 08420010.001 10