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�� ciao GROUP 5E5ERV CE$ as Alconox, and pumping this solution through the pump and hosing The same procedure will be used for a tap water rinse and a final distilled water rinse After decontamination, the pump will be suspended near the bottom of the well and j purging will be initiated The goal of purging is to remove standing water from the casing and filter pack and draw representative water from the surrounding formation into the casing Groundwater will be pumped from the well directly into drums During j purging, the temperature, pH, electrical conductivity and turbidity will be monitored and recorded on individual purge forms for each of the wells Purging will be considered complete when a minimum of three well volumes have been removed, the monitored parameters have stabilized to within ten percent, and the turbidity is below 5 ntu The fine-grained nature of the formation at the site may preclude reaching target turbidity levels and any excursions from the target parameters will be noted on the well purge forms The purge water will be characterized based on the analytical results If applicable, the water will be recycled through the onsite water treatment system and used for dust control If the water cannot be managed onsite, it will be profiled and disposed After purging is considered complete, the well will be allowed to recover to a minimum of 80% of the original water level and a sample will be collected The sample will be obtained from the well using a new disposable bailer The water will be transferred from the bailer to the laboratory-supplied sample bottles using a bottom-emptying device One blind duplicate sample will be collected during each quarter and will be submitted to the laboratory as "MW-4" The samples will be labeled, logged onto the chain of custody form, and stored on ice pending transport to the selected analytical laboratory Each of the samples will be analyzed for total petroleum hydrocarbons (TPH) as diesel fuel using EPA Method 8015, for TPH as gasoline using EPA Method 8015, and for benzene, toluene, ethylbenzene, total xylenes, and MTBE in accordance with EPA Method 8021 Any MTBE detection will be confirmed using EPA Method 8250B 5.0 DATA EVALUATION 1 The water level measurements will be used to calculate the actual direction of groundwater flow and the hydraulic gradient at the site This information will be provided in text and graphic form in the reports described below in Section 7 0 The laboratory report will be reviewed for consistency with the chain of custody and the quality assurance data will be reviewed to determine analytical accuracy The concentrations of the target analytes will be compared to applicable standards to determine the level of impact to the water beneath the site This data will be incorporated into the reports discussed in Section 7 0 Following the completion of the four quarters of monitoring requested b the PHS/EHD, . g p q g Y the data will be evaluated to determine if the monitoring program should be continued or S Troj1P022631220"rkplan_OcM doc