ARCHIVED REPORTS_20100427 ATC 1Q2010 GWMR COMPLETE

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STANDS OPERATING NG PROCEDURE GROUNDWATER WATER iM.ONITOR VMLL PURGING AND 5A1 LING (includes No-Purge Sampling) Phar to purging the well, tie static water level was measured using an electronic interface probe to evaluate the presence of any phase-separated hydrocarbons. The measurements were obtained from a reference point on the north side of the top of the well casing. Fluid measurements were recorded to the nearest 0.01-root. Depth to groundwater was measured from all site wells on the same day. The total depth of the well was also recorded. If phase separated hydrocarbons are noted,a measurement of the apparent thickness was be obtained and the well was not be sampled. To prevent cross-contamination, all monitoring equipment that is in contact with groundwater was washed with Alconoe detergent and rinsed with distilled water prior to use in-each well. If well purging was required before collecting a hater sample, path the static groundwater level and total death of the well mtr e used to calculate the volume of water in the well. Based on this data, if free floating hydrocarbons are not present a minimum of three well volumes of water were purged from the well using a?-inch Grundtos'submersible pump or a PSCC bailer. Periodic meashuemsnts gat approximate 5-gallon intervais; of ternpernab re, p1 and specific electrical conductivity were collected during purging. Whenthree successive: stabilized readings were obtained.the well was sampled. If the well is low yielding and is pumped or bailed dry,the well was allowed to recover at least 80%of the static groundwater level. Tf the well does not recover 80%within a 24-hour time frame,a sample was collected.and recovery noted am the Groundwater Sampling Log. To prevent cross-contamination,equipment was washed with Alconoxl�detergent and rinsed-with distilled water prior to use in the well. Groundwater purged from the well was stored on-s:-.. in 55-gallon dru Ms. ��nd.n�ig pr^p�r da.Ytis.tion. Tfnprh.YTinb before collecting the water samples was required,then the above purging steps were shipped. Ground-water samples were collected from the well using a disposable polyethylene bailer. Each sample was collected in laboratory-preserved 1-liter glass bottles and in 40-milliliter volatile organic analysis CVOA) vials. Each vial was filled completely with sample and preservatives to eliminate headspaee and create a positive meniscus. The vial was capped with convex Terlon® septa: Bach via,was observed to ensure that no air bubbles are prescat within the vial. Samples were marked for identification, placed on ice, and transported to a State-certified laboratory for analysis. Chain-of-custody retards were maintained and accompany all samples to the analytical laboratory.