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. ATC Associates Inc <br /> Quality Assuranc-&Quahty Control Plan <br /> Revised 1998 <br /> standard procedures established by the United States Environmental Protection Agency (EPA) in <br /> "Gurdelrrtes Ertablrshin Test Procedures or the Anal srs o Pollutants Under the Clean Water Act" <br /> (40 CFR, Part 136, October 1984) The laboratory is periodically evaluated through external <br /> performance audits conducted by EPA and DHS using QC labs The specific analytical methods to be <br /> utilized for purgeable and semivolatile hydrocarbons analyses are shown on Table 2 <br /> Provided the database is of sufficient size, statistical techniques may be employed for data validation <br /> 9.0 GROUNDWATER MONITORING PROTOCOL <br /> Monitoring of depth to water and free product thickness within wells at the site will be conducted using <br /> an Interface Probe or Conductivity Meter For consistency, all measurements will be taken from the '+ <br /> north side of the wellhead at the survey mark To assess potential infiltration of fine-grained sediments, ) <br /> total well depth will also be sounded <br /> Product thickness is calculated by subtracting the depth to product from the depth to water In <br /> addition, water elevations are adjusted for the presence of fuel with the following calculation <br /> (Product Thickness) (8) +(Water Elevation) =Corrected Water Elevation <br /> NOTE The factor of 0 8 accounts for the density difference between water and petroleum <br /> hydrocarbons <br /> Newly installed wells will be allowed to stabilize for 24 hours after development prior to free product <br /> inspection <br />