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TABLE 3 <br /> QUALITY ASSURANCE SAMPLE REQUIREMENTS <br /> US CAN-WELTY ROAD <br /> Vernalis,San Joaquin County,California <br /> FREQUENCY <br /> QA/QC SAMPLE Soil Groundwater Wells Grab Groundwater <br /> Field Equipment blank None One per each type of sampling device per day. One per each type of sampling device per day. <br /> One per groundwater sample shipment(only if EPA One per groundwater sample shipment(only if EPA <br /> Field Trip blanks Nomc 8015M analysis for TPHg or EPA 8021B/8260B 8015M analysis for TPHg or EPA 8021B/8260B <br /> analysis for BTEX will be conducted). analysis for BTEX will be conducted). <br /> One per sampling event if more than five samples are <br /> Field Duplicates None collected during that event;if less than five samples One per sampling event if more than five samples are <br /> collected during that event. <br /> per event,then one per year. <br /> One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 <br /> project-specific samples);if more than five samples project-specific samples);if more than five samples project-specific samples);if more than five samples <br /> Field/Laboratory Matrix Spike per event,an additional site-specific MS/MSD per event,an additional site-specific MS/MSD per event,an additional site-specific MS/MSD <br /> sample should be collected and specified in the chain sample should be collected and specified in the chain sample should be collected and specified in the chain <br /> of custody. of custody. of custody. <br /> Laboratory Method Blank One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 <br /> samples). samples). samples). <br /> Laboratory Control Standard One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 One per analytical batch(minimum one per 20 <br /> samples). samples). samples). <br /> Laboratory Surrogate Compounds Every sample as specified by the analytical method. Every sample as specified by the analytical method. Every sample as specified by the analytical method. <br /> Abbreviations: <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> EPA=U.S.Environmental Protection Agency <br /> MS/MSD=Matrix spike/matrix spike duplicate <br /> QA/QC=Quality assurance/quality control <br /> TPHg=Total petroleum hydrocarbons quantified as gasoline <br /> s-$IV <br /> 911., <br /> Page 1 of l Flom Science to Solutions <br />