Laserfiche WebLink
S E C ® R <br /> • Groundwater Sampling Procedures <br /> The sampling procedure for each well Included measuring the water level, and checking for the presence <br /> of separate-phase hydrocarbons (SPH), using either an electronic Indicator and a clear Teflon@ bailer or <br /> an oil-water Interface probe Each well was purged of approximately three casing volumes of water (or to <br /> dryness) using a centrifugal pump, submersible pump, or bailer The equipment and purging method <br /> used for the sampling event were noted on the attached field data sheets During purging, temperature, <br /> PH, and electrical conductivity were monitored In order to document that these parameters were stable <br /> prior to collecting samples After purging, groundwater samples were collected from each well using a <br /> TeflonO bailer, placed Into appropriate EPA-approved containers, labeled, logged onto a chain-of-custody <br /> document, and transported on Ice to a California state-certified laboratory <br /> Laboratory Procedures <br /> Selected soil samples were analyzed for the presence of TPHg, BTEX, and oxygenates by EPA Methods <br /> 8260 Four samples collected from the stockpiled soil were composited at the laboratory, and analyzed <br /> for the presence of TPHg, BTEX, and MtBE by EPA Methods 8015M and 8021 B, and total lead by EPA <br /> Method 6010B <br /> Groundwater samples were collected following well development, and were analyzed for the presence of <br /> TPHd,TPHg, BTEX, fuel oxygenates using EPA Method 8260B <br /> Soil Cuttings and Purge Water <br /> Approximately 15 cubic yards of soil cuttings generated during the Installation of wells and was stockpiled <br /> on-site, pending characterization and disposal The stockpiled soil was removed from the site by Dillard <br /> Environmental, a California-certified disposal contractor, and transported to Forward in Manteca, <br /> California <br /> Water generated during the installation, development, and sampling of the wells was processed through <br /> the onsite groundwater treatment system ,r <br /> 4 <br /> k <br /> r <br /> } <br /> l <br /> F <br /> i <br /> Y9 <br /> w� <br /> 1 1ARM49321ReportsVemedial well-start up doc <br />