Laserfiche WebLink
1 i , <br />! it <br /> I{ <br /> ' t <br /> ATC Associates Inc. <br /> Quality Assurance/Quality Control Plan <br /> +, Revised 1998 <br /> � I{ <br /> standard procedures established by the United States Environmental Protection Agency (EPA) in <br /> I <br /> "Guidelines Establishing Test Procedures for the Analysis of Pb llutants 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.i The specific analytical methods to be <br /> utilized for purgeable and semivolatile hydrocarbons analyses are shown on Table 2. <br /> It <br /> Provided the database is of sufficient size, statistical techniques may be employed for data validation. <br /> 9.0 GROUNDWATER MONITORING PROTOCOL <br /> f <br /> Monitoring of depth to water and free product thickness within wells at the site will be conducted using r <br /> I� <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 /> 1 <br /> i, <br /> Product thickness is calculated by subtracting the depth to product from the depth to water. In <br /> iI <br /> addition,water elevations are adjusted for the presence of fuel with the following calculation! <br /> 1 <br /> i <br /> (Product Thickness) (.8) +(Water Elevation) =Corrected Water Elevation <br /> Ik <br /> Il <br /> NOTE: The factor of 0.8 accounts for the density difference between water and petroleum <br /> hydrocarbons. l ! <br /> Newly installed wells will be allowed to stabilize for 24 hours after development prior to free product <br /> Ij <br /> inspection. <br /> , If <br /> j <br /> } 1 <br /> 3 <br /> i� I <br />