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L Stantec <br /> SECOND QUARTER 2008 GROUNDWATER MONITORING REPORT <br /> Groundwater Monitoring and Sampling Procedures <br /> L July 7,2008 <br /> L 3.0 Groundwater Monitoring and Sampling Procedures <br /> LGroundwater monitoring and sampling was performed on May 27,2008. Prior to purging the <br /> wells, the depth-to-groundwater in each well was measured using an electronic sounding device <br /> Lgraduated to 0.01 feet. Measurements were made relative to the top of the well casing and <br /> recorded on field data sheets. <br /> LPrior to sampling, groundwater monitoring wells were purged of at least three casing volumes of <br /> groundwater. Wells were purged using a new, disposable bailer for each well. Groundwater <br /> temperature, specific conductivity, pH, and clarity were monitored during purging, and <br /> measurements and observations were recorded on field data sheets. <br /> Following stabilization of physical parameters and recovery of the groundwater elevation in the <br /> L well to at least 80 percent of the static level, groundwater samples were collected into <br /> laboratory-supplied glassware. Samples were labeled, immediately placed on ice, and <br /> submitted under a chain-of-custody to Calscience Environmental Laboratories, Inc., a California- <br /> L certified analytical laboratory. Groundwater samples were analyzed for the following <br /> constituents: <br /> L ❑ TPHg, TPHd, and TPHmo by modified U.S. Environmental Protection Agency (US <br /> . EPA) Method 8015B (M)for the diesel- and motor oil-range fractions; and <br /> L ❑ BTEX and MTBE by US EPA Method 8260B. <br /> Purged groundwater was placed in a steel 55-gallon drum and left on-site pending disposal by <br /> PG&E. <br /> is i1pg&e\french camp\groundwater monitoring\may 2008 monitoring\qmr rpt_fnl.doc 3.1 <br />