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' Ceofa$ua(Teahnws Inc 0 0 Page 4 Monitoring Well Installation Work Plan J M Equipment Co ' Project No 507 2 January 17, 1997 ' Before sampling is attempted the well will be sounded for depth to water and then a clear disposable bailer will be used to determine if floating product is present The well will be purged of at least 3 well volumes of stagnant water using either a submersible pump or a ' stainless steel bailer Purging will continue until the temperature, conductivity, and pH of the ground water has stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions is entering the well These water quality parameters are measured at intervals of each well volume purged In addition, the parameters ' of dissolved oxygen (D O ) and oxidation-reduction potential (O R P ) will be measured and recorded ' A stainless steel or disposable plastic bailer will be used to collect each sample Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial and glass amber Iiter bottles Once the sample container is filled and ' capped, the bottle will be inverted, tapped, and checked for head space bubbles The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory ' All non disposable sampling equipment is decontaminated using a steam cleaner before and between uses The effectiveness of the decontamination procedure is ensured by using the following quality control measures ' • Disposable gloves will be used by the technician to collect all samples and will be changed with each sampling event G A bailer blank for each well will be collected prior to sampling by filling the decontaminated stainless steel bailer with water (provided by the laboratory) and then filling a VOA vial (provided by the laboratory) using the same procedures for actual sample collection Bailer blanks for each sample, along with a field blank (prepared from water provided by the laboratory poured into a VOA vial on site), will accompany the samples to the laboratory and serve as checks against cross contamination A chain of custody document, listing all samples collected, accompanies the samples from ' field to laboratory, thereby providing a means to track their movement and insure their integrity ' All water purged from each monitoring well and not used as a sample, will be placed in a 55 gallon DOT approved container, properly labeled and stored on site ' 2.2.1 Ground water Sample Analyses One ground water sample from each well will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory 41400) and analyzed for benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020. Gasoline range petroleum hydrocarbons (TPH- Gas) by EPA method 8015(m), Methyl Tertiary Butyl Ether (MTBE) by EPA method 8020 ' with confirmation by 8260 and diesel range petroleum hydrocarbons analyses (TEPH-Diesel by EPA method 3540/8015m) The detection limits for these compounds are listed below A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity