P&S's chemists can develop analytical methodologies engineered to field-specific requirements. These analytical methodologies are based on approved EPA protocols and procedures and all data undergoes final review by a Ph.D. chemist. P&S has provided on-site laboratory services to its clients for real time analyses of contaminant concentrations in soil, soil gas, and groundwater since 1984. P&S's approach has proven to be cost effective, especially when used in conjunction with MicroWells installed by P&S. On-site analysis provides the client with efficient cost-effective results to refine plume delineation, identify source locations, carry out vertical contaminant profiling and obtain pilot test data. P&S can achieve reporting limits for target analytes that are comparable to, and in some cases exceed those of fixed laboratories.