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Secondarter 1993 Groundwater Monitoring Report Qu P Kang Island Resort,Stockton,CA(Site Code 1557) Project No W0367 01 Page 3 the boring/well log. Soil samples will be collected from each boring at five foot intervals, beginning at a depth of two feet, for lithologic characterization Soils encountered will be monitored for organic vapors by placing a small amount of representative material in a sealed container, then measuring the concentration of volatiles collected in the head space of the container with a photoionization detector (PID) calibrated to the benzene molecule The values obtained at each measurement point will be recorded on the boring logs Soil cuttings generated during the drilling process will also be screened for the presence of volatile organics using a PID The soil cuttings will be stockpiled on site, underlain and covered with six mil plastic Subsequent to installation, the monitoring well will be developed using swab and pump and/or bailing methods Physical parameters (pH, conductivity, temperature) will be monitored during the development process Development water will be contained in DOT 17H drums and stored on site pending laboratory analyses Soil cuttings and groundwater will be disposed of in a timely and appropriate manner after . reviewing the analytical results and obtaining agency approval Subsequent to installation and well development, water samples will be collected from the newly installed monitoring well after purging a minimum of three casing volumes Stabilization of EC, pH, and temperature will be checked after purging and before sample collection to ensure samples are representative of formation water A dedicated bailer with a bottom emptying device will be used to reduce volatilization during sampling The water sample will be transported under chain of custody to a state-certified laboratory and analyzed for BTEX, TPHG, and TPHD by appropriate EPA methodologies All work performed during the investigation will be in accordance with RESNA's Quality Assurance and Quality Control Plan (Attachment 3) and site Health and Safety Plan (Preliminary Report, Assessment of Potential Soil and Groundwater Contamination, December 1990) GROUNDWATER MONITORING PROGRAM Due to continued non detectable levels of contaminants in monitoring wells MW2 and MW3, continued silting of well MW4, and the proposed installation of downgradient well MW6, RESNA, on behalf of the responsible party, recommends the following modifications to the groundwater monitoring and sampling program 2QR-1993 FNL