Laserfiche WebLink
Date August 8,2002 <br /> Quarter 2"d Quarter,2002 <br /> APPENDIX A <br /> SAMPLING AND ANALYSIS PROCEDURES <br /> Sampling Procedures <br /> Sampling equipment is thoroughly cleaned prior to each sample The sampling procedure for each well Includes <br /> measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an <br /> electronic indicator and a clear TeflonO bailer or an oil-water interface probe Wells not containing SPH that do not <br /> have submerged screens are then sampled without purging Wells that have submerged screens are purged of <br /> approximately three casing volumes of water (or to dryness) using a submersible pump, centrifugal pump, gas <br /> displacement pump,or bailer The equipment and purging methods used for the current sampling event are noted on <br /> the attached field data sheets During purging, temperature, pH, and electrical conductivity are monitored in order to <br /> document that these parameters are stable prior to collecting samples After purging, water levels are allowed to <br /> partially recover Groundwater samples (both purge and no-purge) are collected using a disposable Teflon® bailer, <br /> placed into appropriate EPA-approved containers, labeled, logged onto chain-of custody documents, and transported <br /> on ice to a California state-certified laboratory <br /> Laboratory Procedures <br /> The groundwater samples were analyzed for the pretience of TPHG, benzene, toluene, ethylbenzene, and xylenes <br /> (total) using EPA Methods 8015 (modified) and 8020 and MTBE using EPA Method 8260E One sample was <br /> analyzed for the presence of oil and grease using EPA Method 5520BIF The methods of analysis for the <br /> groundwater samples are documented in the certified laboratory analytical report The certified laboratory analytical <br /> report,chairs-of-custody documentation, and field data sheets are presented as Attachment B <br /> Purge and Rinsate Water Disposal <br /> Water generated during well sampling and equipment cleaning is pumped into a truck-mounted water tank The <br /> water is transported to Atlantic Richfield Company s holding facility in Roseville, California, for temporary storage <br /> Water is then transported by Dillard Environmental Services to Altarriont Landfill and Disposal Facility in Altamont, <br /> California for disposal <br /> i <br /> I <br /> K 115 BP%RMfl04341Q.-er1y12 QTR 021G%VNIR doe Page A-1 <br />