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Canepa Is Car Wash 248 E Park Street, Stockton, CaWornia January 14, 1994 Interim Status Report on Phase II Investigation Page: 4 The laboratory samples did not have head space and were immediately sealed in their liners using aluminum foil-lined plastic caps All soil samples were properly labeled with project name!number, date and time collected, sample identification and analysis requested Samples were additionally sealed in air-tight plastic bags before being refrigerated for delivery to the laboratory, and were under no circumstances opened by anyone other than laboratory personnel. Chain of Custody records were maintained at all times The remaining samples were removed from their liners and used as an aide to the on-site geologist in logging the material at that depth Soil samples collected for laboratory analysis were analyzed using EPA method 8020 for BTX&E, method 5030/LUFT for total petroleum hydrocarbons - gasoline, and method 3550 for total petroleum hydrocarbons - diesel The State certified laboratory analyzing the soil samples was Geo-Monitor, Inc , of Hesperia, California, a State certified laboratory 3.5 Groundwater Sampling A travel blank provided by the laboratory accompany the sample vials from the time they are picked up from the lab to the time they are delivered to the lab This travel blank was listed on the Chain of Custody but was analyzed only if all samples contain: the same contaminants All sampling equipment including the pump, bailer, and cables, used by sampling personnel, was disassembled, if appropriate, and steam-cleaned prior to commencement of sampling These procedures were also followed between each well, sampling point, and at the end of the sampling day De-romzed or orgaruc-free water (also provided by the laboratory) was then introduced into the pump or bailer as a final stage of cleaning This water was then pumped or gently poured into sample vials to be used as pump or bailer blanks. These blanks were tested only if their corresponding samples were found to contain contaminants. Immediately prior to sampling, water levels and well depth measurements were taken in all wells at the site Each well was evacuated using a stainless steel bladder pump, which does not introduce air into the water column, or a Teflon bailer The pH, temperature, and electrical conductivity of the water was monitored as the well was evacuated These parameters were noted on Field Logs (Table 3 &Appendix D) Instruments calibrated to known standards were ' used to monitor these parameters. At least five well volumes were evacuated from each well, and more, if necessary, until the above parameters had stabilized Wells that are de-watered ' before evacuation of five well volumes had been accomplished were sampled upon eighty percent recovery of the uutial water level. The wells or other sampling points were sampled in order of the least to the most contaminated, as best known or estimated The samples were pumped from a stainless steel bladder pump or carefully poured from a Teflon bailer into clean glass vials with Teflon-lined screw caps and half gallon plastic containers provided by the laboratory Care was taken to ensure that no air space existed in the vials by inverting to check ' for bubbles and re-sampling as necessary.