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WZI iNc ' 60 ONSITE ANALYTICAL LABORATORY PROCEDURES ' 61 Analysis 1 WZI will ensure that the onsite mobile analytical laboratory contractor will make three ' standards for each compound, with certified pure standards, methanol, and water The daily working standards shall be in the range of expected concentrations, and ' within the linear range of the instrument Water used for standards will be analyzed for purity An initial three point calibration will be run at the start of the project and a ' verifying midpoint calibration at the beginning of each analytical sequence A three point calibration will be run in the event the continuing calibration failed to meet the ' percent deviation requirements After every tenth non QC soil gas sample, a standard having a similar detector response to that observed during analysis of field samples ' will be run Prior to sampling each probe, the sampling device used for soil gas sample collection ' will be filled with the ultra high purity nitrogen gas The nitrogen gas is then injected directly into the gas chromatograph This sample injection serves as a blank to detect ' contamination of the syringe to be used for sampling Ambient air shall be run through the entire sampling system from probe (aboveground) through the adaptor to collect ' a system blank sample at the start of each day, and before reusing any sampling system component Laboratorycontractor shall clean syringes or other sampling ng devices and adapters ' with Alconox type detergent at the end of each day ' One soil gas sample per day shall be collected in a one liter Tedlar bag, VOC bottle or other sterile container for analysis on a Gas Chromatograph (not mobile) to confirm ' mobile identification of compounds This sample will be referred to as the split sample APPENDIX 111 ' 12270020 025 15