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MNNfEA$ pE51$4EA$(gLSiAliS � <br /> 3.3 GROUNDWATER SAMPLINQ <br /> �. The new monitor wells will be allowed to equilibrate for at least 24 hours after well development <br /> before they are sampled. Before sampling, the groundwater depth will be measured and a well <br /> volume will be calculated. The well will be purged of three to five casing volumes. During <br /> V <br /> purging, temperature, electrical conductivity, and pH will be measured and recorded every well <br /> volume. <br /> Y <br /> After the groundwater parameters (temperature, electrical conductivity, and pH) have stabilized <br /> a groundwater sample will be collected using a Teflon bailer. Groundwater collected in the <br /> bailer will be poured into the sample container in a way that minimizes aeration of the sample. <br /> Containers will be labeled and sealed in individual plastic bag. Samples will be placed in an <br /> insulated cooler with ice and chilled to a temperature of 4° C immediately after collection. <br /> '-� A sample Iabel will be affixed to every sample container and will include the following <br /> information: sample ID, date, time sample collected, sampler's initials, requested analytes, and <br /> i, preservatives used. <br /> Sample ID numbers, locations, and dates will be recorded in the log book. Any observations <br /> regarding the sampling process and field related activities or the surrounding environment which <br /> may affect the sampling quality will be noted in the Iog book. <br /> A chain-of-custody document will be initiated at the time of sampling and will accompany the <br /> sample(s) to the laboratory. <br /> All groundwater samples will be analyzed for TPHe (modified EPA Method 8015), TPHp <br /> (modified EPA Method 8015), and BTEX (EPA Method 8020). Detection limits of will be in <br /> accordance with the RWQCB's tri-regional guidelines. All analyses will be conducted by a State <br /> of California certified analytical laboratory. <br /> ... 3.4 EQUIPMENT DECONTAMINATION <br /> All non-disposable down-hole equipment will be decontaminated prior to sampling and between <br /> sample locations. The equipment will be cleaned with a solution of tap water and laboratory <br /> grade cleaning detergent followed by a rinse with potable water and a rinse with deionized <br /> water. All down-hole drilling equipment will be steam cleaned prior to drilling. <br /> L <br /> LTItOJECrMANJOQIMVCWM.WP /�7 <br /> 12 May 1995 <br />