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(11/81) II BACKGROUND * Identify current and historical site information and data which might have a bearing on the proposed sampling and data collection effort. Describe the site hydrogeology, when applicable. Include unusual analytical parameters and special methods from past site work. Summarize the significant analytical results from previous sampling events. * The updated Preliminary Assessment is only required for initial Site Inspection Sampling Plans. III MAPS * All pertinent locations should be identified. * Highlight sampling points, }mown & potential contamination sources, directions of groundwater flow, and all other significant information on the maps. IV RATIONALE FOR SAMPLE LOCATIONS► NUh' ERS OF SAMPLES, & ANALYTICAL PARAMETEPS * This section covers the what, where and why of the sampling plan. * Identify the specific sampling points and analytical parameters. * Discuss the rationale behind the sample point selection process and whether it is based on a random, judgemental, or systematic approach, or a canbination of these. Are sane s anpling points (e.g. , wells) left out? If so, explain why. What is not being sampled? * Discuss the rationale behind the analytical parameters being selected. Explain why some samples may be analyzed for one suite of analytical parameters and other samples for different parameter suites. Identify the site indicator canpounds and other parameters of most significant interest. If low (non-routine) detection limits are required, identify the action levels of concern. V REQUEST FOR ANALYSES (Tabular and Narrative) * This section provides the details necessary for obtaining analytical services through EPA's Contract Lab Program (CLP) and/or from a non-CLP laboratory. * CLP analyses will be either Routine Analytical Services (RAS) , or Special Analytical Services (SAS) , or a combination of these two analytical services (RAS+SAS) . * Under the RAS program four types of analyses are provided for soil and/or water matrices: volatiles, semivolatiles, pesticides/PCBs, metals and cyanide. The ccmpounas included in the RAS analyses are the CLP Target Conpound List (TCL) . Appendix B lists all of the compounds on the TCL by type of analysis, and includes the contract required quantitation limits (CRQLs) . The Hazardous Substance List (HSL) and Priority Pollutant List (PPL) are NOT identical ccmpounds lists to the TCL.