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OCT 35 '95 10:41AM SPK-ED-M HTW 7,955 F,z CESPK-ED-EFfk'KC Tracy 19 October 1995 MEMORAMUM FOR: CESPK-ED-EF (M. Mackenzie) SUBJECT: JUSTIFICATION FOR TEE 65% SURROGATE RECOVERY REFERENCE: (1)SW 846, REVISION 0, SEPTEMBER 1986 (2) SW 846, REVISION 1, JULY 1992 (3)USEPA CONTRACT LABORATORY PROGRAM, REVISION OLM02.1 1. Background: Reference(2)has superseded reference(1). Therefore, the surrogate recovery criteria based on ±20%of the spiked amount is no longer used. Furthermore, reference(2)should now be used as the current source for EPA guidelines in this project. In particular, Chapter 1 "Quality Control," states that the surrogate recovery criteria should be established on a case-by-case basis, taking into consideration the project and data quality objectives. For this project, USACE has chosen to follow the guidelines set forth by reference(3). Reference (3) is used by the U. S. Environmental Protection Agency to implement environmental investigation and cleanup activities as mandated by the Comprehensive Environment Response Compensation, and Liability Act of 1980(CERLA)and the Superfund Amendments and Reauthorization Act of 1986(SARA). Specifically, on page A-3 of reference(3), it states that any useable data that is obtained in an investigation of a hazardous waste site(this includes remedial investigations/feasibility studies and remedial design)can be used to determine when remedial actions are complete. To monitor the performance of the soil sample analyses for gasoline, bromofluorobenzene was chosen as the surrogate and the minimum recovery was set at 65%. (Note: This percentage recovery is more stringent than the EPA recommended criteria of 59% as shown on page D-60NOA of reference(3). Also, this criteria was earlier stated in the documents and work plans for this project which was accepted by the regulator) 2. Action. Therefore,tbs 65% is valid and suitable for the intended use.( Kee Chan Project Chemist cf. Chris Prescott