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S E C 0 R <br /> +7-Eleven Store#32262 <br />' - Quarterly Groundwater Monitoring Report (2Q2004) <br /> August 18, 2004 <br /> Page 4 <br /> and checking for the presence of liquid-phase hydrocarbons (LPH), using either an <br /> electronic indicator and a clear Teflon`s bailer or an oil-water interface probe Wells not <br /> containing LPH were purged of approximately three casing volumes of water (or to dryness) <br /> using a submersible pump or bailer The equipment and purging methods used for the <br /> current sampling event are noted on the field data sheets included in Attachment A During <br /> purging, temperature, pH, and electrical conductivity were monitored to document that <br /> these parameters were stable prior to collecting samples After purging, the water level <br /> was allowed to recover to 80% of the original levels prior to collection of the water sample <br /> Groundwater samples were collected using a disposable Teflon`s bailer, placed into <br /> appropriate Environmental Protection Agency (EPA) approved containers, labeled, logged <br /> onto chain-of-custody documents, and transported on ice to a California state-certified <br /> laboratory Copies of the field notes have been included in Attachment A <br /> GROUNDWATER SAMPLE ANALYSES AND RESULTS <br /> The groundwater sample collected from MW-1 through MW-5, MW-6D, and TP-1 were <br /> analyzed for TPHg, BTEX, and fuel oxygenates MtBE, TBA, diisopropyl ether (DIPS), ethyl- <br /> tert-butyl ether (EtBE), and tert-amyl-methyl ether (TAME) by EPA Method 8260B 1,2- <br /> dichloroethane and 1,2-dibromoethane were also analyzed by this method The certified <br /> laboratory analytical report and chain-of-custody documentation are presented in <br /> Attachment B <br /> Groundwater analytical results are presented on Figure 3, and are summarized in Tables 1 <br /> and 2 <br /> PURGE AND RINSATE WATER DISPOSAL <br /> Water generated during well sampling and equipment cleaning was pumped into a SECOR <br /> truck-mounted water tank The water was transferred into properly labeled 55-gallon drums <br /> and stored on-site The drummed non-hazardous petroleum hydrocarbon contaminated <br /> water is transported quarterly by Belshire Environmental to Demenno Kerdoon in Compton, <br /> California, for disposal <br /> ATTACHMENTS <br /> Figures <br /> Tables <br /> Attachment A— Field Notes <br /> Attachment B — Certified Laboratory Analytical Reports and Chain-of-Custody Documentation <br /> Attachment C —Shell Station — 2375 W Grant Line Road, Tables <br /> k <br /> cc Ms Lori Duncan, San Joaquin County Environmental Health Department <br /> Mr James Barton, Regional Water Quality Control Broard, Central Valley Region <br /> Ms Karen Petryna, Shell Oil Products c/o Mr Joe Neely, Cambria (PDF Copy) <br /> i <br /> 32262 04-2Q Report doc SECOR International Incorporated <br />