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Manteca Unified School District <br /> Subsurface Soil& Groundwater Investigation <br /> will be tested only if their corresponding samples are found to contain <br /> contaminants. <br /> Immediately prior to sampling, water levels and well depth measurements will be <br /> taken in all wells at the site. Each well will be evacuated using a stainless steel <br /> bladder pump, which does not introduce air into the water column, or a Teflon <br /> bailer. The pH, temperature, and electrical conductivity of the water will be <br /> monitored as the well is evacuated. These parameters will be noted on a field log. <br /> Instruments calibrated to known standards will be used to monitor these <br /> parameters. At least 5 well volumes will be evacuated from each well, and more, <br /> if necessary, until the above parameters have stabilized. Wells that are de- <br /> watered before evacuation of 5 well volumes has been accomplished will be <br /> sampled upon 80 percent recovery of the initial water level. The wells or other <br /> sampling points will be sampled in order of the least to the most contaminated, as <br /> best known or estimated. The samples will be pumped from a stainless steel <br /> bladder pump or carefullYPouredfrom a Teflon bailer into clean <br /> lass vials with <br /> Teflon-lined screw caps and half-gallon plastic ,containers provided by the <br /> laboratory. Care will be taken to ensure that no air space exists in the vials by <br /> inverting to check for bubbles and re-sampling if necessary. <br /> The groundwater samples will be analyzed or extracted within 14 days according to <br /> their EPA methods. The samples shall be analyzed for Total Petroleum <br /> Hydrocarbons (diesel) and BTX&E (Benzene, Toluene, Xylene, and Ethyl <br /> Benzene). The minimum detection limits used for each analyte will be .0005 mg/l <br /> for BTX&E and 0.05 mg/I for diesel. Analysis will be conducted by GeoAnalytical <br /> Laboratories, Inc. in Modesto, California. <br /> Prepared By: ED GFo <br /> 5 G�RT«rFa lo�— <br /> w ROBERT FOURT cn <br /> cc Na. 18 � <br /> cn <br /> Exp �� <br /> Robert Fourt, CHGqT 9Q GE��o�' <br /> Certified Hydrogeologist#180 FOF CASVI ON <br /> �4w�~KL <br /> c ael oberdanz, REA S 41 . <br /> California Registered Environ ntal Assessor#02157 <br /> California Registered Enviro ental Health Specialist 44783 #- No.02157 <br /> Expires: <br /> CAL if0 <br /> 6 <br />