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TRACY P-TASK 14 TDS MONITORING WELD MISTALIAI ION WORK PIAN Sampling and Analysis Plan Monitoring well sampling will occur only after the monitoring wells have been developed. A minimum of one week will elapse prior to well-sampling. Sampling of the TSD monitoring wells will be conducted by the City in conjunction with their routine quarterly sampling of the Holding Ponds monitoring wells. Table 3 summarizes the analyses that will be performed on the samples, together with analytical methods,preservation methods,and sample containers. Sampling Procedures Prior to initiating the sampling event, the depth to groundwater will be measured to the nearest hundredth of an inch using an electronic sounding device. The volume of water contained within the well will be determined and time for purging one well volume will be calculated. The City purges and samples its wells with a flinch submersible Grunfos pump. Measurements collected in the field include pH,conductivity, temperature,and dissolved oxygen. At least 10 well volumes will be withdrawn from the well using the submersible pump. After confirmation that 10 well volumes have been purged, the groundwater sample will be collected. Samples will be collected directly from the pump discharge line and poured directly into the laboratory-supplied containers. The amount of air mixing with the samples will be minimized by tilting the bottle to allow water to run down the inside wall of the bottle. Bottles will be filled completely to minimize air contact. The well number,date, time,and analyses will be written directly on the sample label with a water proof pen. Filled bottles will be placed directly into a cooler packed with ice. the written record documenting the sampling process will contain: • Well number • Sampling team members • Sample type • Sampling methodology • Sample preservation • Date and time of collection • Field measurements • Field conditions and deviations,if any • Observations • Decontamination Water from the sampling event will be contained and transported to the WWTP for processing. If,after three sampling events,groundwater conditions are determined to be within normal ranges for the area,the water will not be contained. Oddm 31,2007 a