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Treadwell&Rollo <br /> submitted to the for laboratory analysis. Grab groundwater samples were collected by Spectrum • <br /> using disposable or stainless steel bailers lowered into temporary PVC well casing which had <br /> been placed into the hole. <br /> Borings permits were obtained from the SJCEHD and SJCEHD inspectors were onsite to <br /> observe boring closures. Borings were closed by grouting to the surface a cement bentonite <br /> grout. <br /> 2.1.3 Groundwater Well Sampling Methodology <br /> Prior to.groundwater sampling at existing wells, groundwater levels were taken from the top of <br /> the casing. The wells were then purged of approximately three well casing volumes using a <br /> peristaltic pump. Physical water quality parameters, including temperature,pH, and electrical <br /> conductivity were measured, and observations such as color, turbidity, and sediment content <br /> were noted after the removal of each well casing volume. After purging, groundwater samples <br /> from each well were obtained for chemical testing using a new disposable or stainless steel bailer • <br /> at each well. <br /> At each temporary boring location where grab groundwater samples were collected, disposable <br /> or stainless steel bailers lowered into temporary PVC well casing which had been placed into the <br /> hole. All groundwater samples were decanted into laboratory-prepared containers and <br /> immediately sealed, labeled, and placed in an ice-cooled chest until delivery to the laboratory <br /> using chain-of-custody procedures. <br /> 2.1.4 Laboratory Analyses and Quality Control Methodology <br /> The following analytical methods were used by Curtis & Tompkins laboratory for this <br /> investigation: <br /> PAHs- EPA 8310 <br /> 18 <br /> 25970309.DGD 24 August 2000 <br />