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Ripona Market 10 Subsurface Soil &Groundwater Investigation II Page: 6 Immediately prior to sampling, water levels and well depth measurements will be taken in all wells at the site Each well will be 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 will be monitored as the well is evacuated These parameters will be noted on a field log Instruments calibrated to known standards will be used to monitor these parameters At least 5 well volumes will be evacuated from each well, and more, if necessary, until the above parameters have stabilized Wells that are de- watered before evacuation of 5 well volumes have been accomplished will be sampled upon 80 percent recovery of the initial water level The wells or other sampling points will be sampled in order of the least to the most contaminated, as best known or estimated The samples will be 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 will be taken to ensure that no air space exists in the vials by inverting to check for bubbles and re-sampling if necessary The samples will be analyzed or extracted within 14 days according to their EPA methods Water samples collected for analysis will be analyzed by EPA method 8021B for BTX&E, EPA 8260 for Oxygenated Compounds and method 5030 for gasoline The minimum detection limits used for each analyte will be 0005 mg/l for BTX&E, 001 mg/l for 8260, and 0 05 mg/l for gasoline Analysis will be conducted by GeoAnalytical Laboratories, Inc Prepared by �y� tis Michael 3 Kloberdanz, REA, HS a`�u California Registered Environmental Assessor 402157 ` California Registered Environmental Health Specialist #4783 EurC-850100 f I