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2.2.3 Wellhead Elevation Survey A licensed land surveyor will survey each of the newly-installed wellheads. The surveyor will measure the elevation of the top of well casings to the nearest 0.01 foot, referenced to a benchmark. The locations of the wells and other site features will also be surveyed. 2.2.4 Groundwater Monitoring. Sampling and Analysis After the monitoring well seals have set for at least 72 hours, and then on a quarterly basis thereafter, the wells will be monitored and sampled. Depth-to-groundwater and free product thickness (if necessary)will be monitored using a water level indicator capable of measurements to within 0.01 foot. Following groundwater level measurements, the wells will be purged and sampled. The wells will be purged with a decontaminated PVC bailer until at least three well casing volumes have been removed and/or after groundwater temperature, pH and electrical conductivity values have stabilized. Groundwater will be sampled from the wells using disposable polyethylene bailers and laboratory-supplied bottles. Each sample container will be labeled, packaged in an iced cooler and transported for analysis with chain-of-custody documentation to a state of California certified hazardous waste testing laboratory. Each groundwater sample will be analyzed on a standard turn- around for TPH-as-gasoline, BTEX, MTBE, DIPS, ETBE, TAME, TBA and 1,2-DCA by EPA Method 8260B. 2.2.5 Waste Storage and Disposal All waste soil generated during drilling will be stockpiled at the site pending analytical results and proper disposition. The soil will be placed on plastic sheeting and covered. Equipment rinsate and purged groundwater will be contained in 55-gallon drums for temporary on-site storage. 2.3 Domestic Well Sampling and Analysis The on-site-domestic water well will be sampled quarterly, at the same time as the sampling of the three groundwater monitoring wells. Prior to sampling, the well will be purged until the well pump is activated. The water samples will be collected from the wellhead using an available sampling port. Each sample container will be labeled, packaged in an iced cooler and transported for analysis with chain-of-custody documentation to a state of California certified hazardous waste testing laboratory. Each sample will be analyzed on a standard turn-around for TPH-as-gasoline, BTEX, MTBE, DIPS, ETBE, TAME, TBA and 1,2-OCA by EPA Method 82608. 10