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CLEARWATER <br /> I G R O U P <br /> Envoranmenta! Servrces <br /> 2.0 GROUNDWATER MONITORING - THIRD QUARTER 2001 <br /> i <br /> 2.1 Purpose <br /> This was a scheduled event in the ongoing effort to monitor the dissolved-phase contaminant <br /> concentrations in the existing network of monitoring wells (MW-1 through MW-8) The <br />' <br /> objective of these activities was to amass a body of data in order to identify trends in contaminant <br /> concentration, contaminant type and groundwater elevations over time <br /> 2.2 Groundwater Monitoring Activities <br /> On September 30, 2002 a groundwater monitoring event was performed at the subject site All <br /> Ieight monitoring wells were sampled An electronic water level indicator, accurate to within <br /> ±0 01-foot, was used to gauge depth to water All wells were checked for the presence of light <br /> non-aqueous-phase liquid (LNAPL) prior to purging No measurable thicknesses of LNAPL <br /> were observed on groundwater in any of the wells In preparation for sampling, the wells were <br /> I purged of groundwater until sampling parameters (temperature, pH, and conductivity) stabilized, <br /> this occurred with the removal of approximately three wet casing volumes Field activities were <br /> performed in accordance with Clearwater's Field Procedures (Appendix A) Groundwater <br /> monitoring and well purging information are presented on Gauge Data/Purge Calculations and <br /> Purge Data sheets (Appendix B) <br /> Followingrecovery of water levels to at least 80% of their static levels groundwater samples <br /> rY , l� p <br /> were collected from the wells using disposable polyethylene bailers and transferred to laboratory <br /> supplied containers Sample containers were labeled, documented on a chain-of-custody form, <br /> and placed on ice in a cooler for transport to the Kiff Analytical Labs, a DOHS-certified <br /> laboratory located in Davis, California Groundwater samples were analyzed for concentrations <br /> of total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylene <br /> Iisomers (BTEX), and methyl tert-butyl ether(MTBE) using EPA Method 8260 <br /> Purging devices were cleaned between use by an Alconox® wash followed by double rinse in <br /> clean tap water to prevent cross-contamination Rinseate was stored on-site in labeled 55-gallons <br /> drums pending future removal and disposal <br /> • <br /> I <br /> ZB 178C CAP 4 November 20,2002 <br />