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2.3.2 Monitorin Well Development and Elevation Survey <br /> The wells will be surged by the driller, following the placement of the sand packs and prior to the <br /> installation of the well seals. After the monitoring wells are completed and the seals have had <br /> sufficient time to set (at least 72 hours), the wells will be fully developed and sampled. Prior to <br /> developing the wells, the well volumes will be calculated and documented. To complete the well <br /> development, the wells will be pumped with a downhole electric pump until at least five (5) well <br /> volumes have been removed and groundwater temperature, pH and electrical conductivity have <br /> stabilized. <br /> The elevation of each of the newly-installed wellheads will be surveyed by a state of California <br /> licensed land surveyor. The surveyor will measure the top of the well casings to the nearest 0.01 <br /> foot, referenced to an established benchmark. <br /> 2.3.3 Groundwater Monitoring, Sampiing and Analysis <br /> Prior to groundwater pumping, depth-to-groundwater and free product thickness (if necessary) will <br /> be monitored using a water level indicator capable of measurements to within 0.01 foot. Following <br /> liquid level measurement, the wells will be purged with an electric down-hole pump and sampled. <br /> Groundwater will be sampled from the wells using a disposable bailer and laboratory-supplied <br /> containers. Each sample container will be labeled, packaged in an iced cooler and transported <br /> under chain-of-custody documentation to a state of California-certified hazardous waste testing <br /> laboratory for analysis. The groundwater samples will be analyzed on a standard turn-around time <br /> of 5 to 7 working days for TPH-as-diesel, TPH-as-gasoline, BTEX and MTBE by Modified EPA <br /> Methods 8015 and 8020. To evaluate the possible presence of alcohol- and ether-based <br /> oxygenate compounds, the 3 groundwater samples collected from the monitoring wells will also be <br /> analyzed for volatile organic compounds by EPA Method 8260. <br /> 2.3.4 Waste Storage and Dis osal <br /> All waste soil, equipment rinsate wastewater and purged groundwater will be contained in separate <br /> 55-gallon drums for temporary storage and proper disposal. The disposition of the waste soil and <br /> water will be depend on the concentrations of petroleum hydrocarbons detected in soil and <br /> groundwater samples analyzed during the project. Based on historical soil and groundwater <br /> sample analyses, the waste soil will likely be classified as non-hazardous and disposed of <br /> accordingly. <br /> 9 <br />