This Overall Quality Assurance Project Plan (OQAPP) has been prepared as a component of Delivery Order No. 2 of Contract DAAA15-90-D-0017. The purpose of this OQAPP is to define responsibilities and authorities, and to prescribe requirements for assuring that the remedial investigation (RI) and feasibility study (FS) for Fort Sheridan are planned and executed in a manner consistent with U.S. Army Environmental Center (USAEC), U.S. Environmental Protection Agency (EPA) Region V, and Illinois Environmental Protection Agency (IEPA) quality assurance (QA) objectives. This OQAPP provides guidance and specifications to ensure that: (1) Field determinations and laboratory analytical results are of known quality and are valid, consistent, and compatible with the USAEC chemical database through the use of approved methods, preventive maintenance procedures, calibration and analytical protocols, quality control (QC) measurements, reviews, and audits. (2) Samples are obtained using appropriate, documented procedures; identified uniquely; and controlled through sample tracking systems and chain-of-custody procedures. (3) Records are retained as documentary evidence of the quality of samples, applied processes, equipment, and results.(4) Generated data are validated. (5) Calculations and evaluations are accurate, appropriate, and consistent throughout the project.

This ESE standard operating procedure follows EPA SW-846 protocols with additional quality control requirements applicable for the Class lM analysis under the USAEC guidelines for implementation of ER 1110-1-263 of the following (see Table 1.1.1) semivolatile organic compounds in extracts prepared from all types of solid waste matrices, and soils.

Fort Sheridan performed validation of analytical data that were collected during the Phase I Remedial investigation (RI) in 1990 to 1991. As required by the Final Overall Quality Assurance Project Plan Remedial Investigation/ Feasibility Study, Fort Sheridan, Illinois (OQAPP), Environmental Science & Engineering, Inc. (ESE), 1995, the validation was performed in accordance with the U.S. Environmental Protection Agency (USEPA) Contract Laboratory National Functional Guidelines. The results of the validation can be found in detail in the Final Data Validation Report (ECG, April 1996). The data validation process resulted in some of the data being assigned qualifiers "R" (meaning rejected) and "J" (meaning estimated). The significance of these two qualifiers on data usability for the RI was discussed between representatives of Fort Sheridan, USEPA, Illinois EPA, the U.S. Army Environmental Center (USAEC), and ESE. It was determined from this discussion and regulatory comments that resampling of most of the rejected (R-flagged) data would be conducted to replace the Phase I data. Also, at least 10 percent of the J-flagged samples would be resampled/ reanalyzed and compared with the Phase I results to provide an indication of overall data quality.