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Fuller Mobile Home Park 365 F- Louise Ave-, Lathrop, California December 20, 1993 Phase H Site Characterization Page. 4 2 5 mg/Kg for gasoline and 10 mg/kg for diesel Analyses were conducted by Geo- Monitor, Inc, of Hesperia, California, a State certified laboratory 3.5 Groundwater Sampling A travel blank provided by the laboratory accompanied the sample vials from the time they were picked up from the lab to the tune they were delivered to the lab This travel blank was listed on the Chani of Custody but was analyzed only if all samples contained 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 and sampling point, and at the end of the sampling day De-ionized or organic-free water (also ' provided by the laboratory)was then introduced into the pump or bailer as a final stage of cleaning This water ww,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 contanunants 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, acid electrical conduct-natty of the water was monitored as the well was ' evacuated, and were noted on the field logs (Table 3 & Appendix D) Instruments calibrated to known standards were used to monitor these parameters ' At least five well volumes (or more, if necessary) were evacuated from each well until the above parameters became stable Wells that are de-watered before the evacuation of five well volumes had been accomplished were sampled upon eighty percent ' recovery of the initial water level The wells or other sampling points were sampled in the order of least contaminated to 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 if necessary The samples were analyzed or extracted within 14 days according to their EPA ' methods Water samples collected for analysis were analyzed by EPA method 602 for BTX&E compounds, method 5030/modified 8015 for gasoline range hydrocarbons and method 3510 for diesel range hydrocarbons The minimum detection limits used for each analyte were 0 5 ,ug/kg for BTX&E, 0 5 mg/l for gasoline and 0 05 mgfkg for diesel Analyses were conducted by Geo-Morutor of Hesperia, California, a State certified laboratory