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L 5.2.3 Sample Collection Water samples will be collected from monitoring wells using disposable polyethylene bailers. t Samples will be collected in such a manner that agitation and exposure of the groundwater to the atmosphere is minimized. Samples containers will be filled by using a disposable attachment that minimizes turbulent flow. A field record of water sample form will be completed for each well sampled. Y L One duplicate groundwater sample will be collected during each sample round.The duplicate sample will be collected in the same manner as the primary sample,following collection of the primary sample. 5.2.4 Sample Preservation and Handling r Samples will be collected into Iaboratory-supplied containers. The samples will be placed on ice immediately following collection, and kept in coolers until shipment to the laboratory for analysis. L 5.2.5 Field Parameters The pH,electrical conductivity, and temperature of the groundwater will be measured in the field during the purging of the wells prior to sample collection. The meters used for measuring these L parameters will be calibrated prior to use according to the manufacturer's instructions. Field parameters will be recorded on a field record of water sample form for each well.These records will be included in the sampling report. L 5.2.6 Chain-of-Custody Procedures a The chain-of-custody form will include the sample identification,date and time of sample collection, sample collector's name,the project site name, analysis requested, and the signature of and inclusive time and date of sample possession of each person assuming possession of the samples. A copy of the chain-of-custody form will be included in the sampling reports. 6.0 SCHEDULING AND REPORTING The first of four rounds of quarterly monitoring will be conducted during June 2003. Subsequent monitoring events will be completed in August and November 2003,and February 2004. �,. Quarterly sampling results will be provided in a brief letter format by the last day of the second month following the end of each quarterly sampling event. Quarterly reports will include summary tables of current and historical analytical results and water level elevation data and site maps showing analytical results and groundwater elevation contours. Chain-of-custody documentation,field record of water sampling forms, and analytical laboratory reports will be included as attachments. The reports will include a brief discussion of the results. The first quarterly report, to be completed following installation of MW-8,will include a description of the well installation activities. Well installation will be completed within eight weeks of approval of this work plan. i Following the completion of four quarterly groundwater monitoring events, a summary report will be prepared. The summary report will include time versus concentration plots showing historical trends in concentrations of TPEM and 1,2-DCA. A site conceptual model will be 4. presented and discussed. The monitoring results will be used to assess the stability and lateral and vertical extent of the TPH/D and 1,2-DCA groundwater contamination,and the stability of 1.. 6 q