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GROUNDWATER QUALITY SAMPLING - INSTALLED GROUNDWATER QUALITY <br /> MONITORING WELL <br /> Prior to collecting any groundwater samples, the potentiometric surface elevation in the <br /> groundwater quality monitoring well will.be measured. The groundwater quality monitoring <br /> well will then be purged of stagnant groundwater utilizing a decontaminated acrylic bailer. <br /> Prior to initial use the acrylic bailer will be disassembled,washed in a mixture of Liquinox and <br /> clear water, rinsed in clear water, rinsed in distilled water, rinsed in deionized water, allowed <br /> to air dry, and reassembled. The use of phosphate-based cleaners, such as TSP, will not be <br /> allowed due to the documented laboratory analyses interference effects caused by the <br /> phosphate compounds in these types of cleaners. Purged water will be monitored for pH, <br /> temperature and conductivity. Purging will cease when temperature and conductivity readings <br /> have stabilized after five minutes of continual monitoring. Groundwater pH, conductivity and <br /> temperature will be documented during purging operations. <br /> The groundwater quality monitoring well will be sampled utilizing a decontaminated Teflon <br /> point-source bailer. Groundwater samples will be collected in laboratory supplied containers <br /> at the base of the bailer via a Teflon check valve and nipple. Prior to initial use, the bailer <br /> will be disassembled, washed in a mixture of Liquinox and clear water, rinsed in clear water, <br /> rinsed in distilled water, rinsed in deionized water, allowed to air dry, and reassembled. The <br /> use of phosphate based cleaners, such as TSP, will not be allowed due to the documented <br /> laboratory analyses interference effects caused by the phosphate compounds in these types of <br /> cleaners. At the groundwater quality monitoring well, a clean, unused bailer line will be <br /> utilized to lower and raise the bailer. <br /> Following transference, each sample container will be labeled, logged on a chain of custody <br /> form, and placed in an ice chest to be kept at 4°C during transport to a State of California <br /> certified analytical laboratory. Appendix B presents the proposed sampling and analytical <br /> protocol. <br /> rlgbb-01(m�2* Page 5 <br />