FINAL SITE INSPECTION REPORT

7347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697701. If the sample measurement is less than or equal to the sample quantitation limit, noobserved release is established.2. If the sample measurement is greater than or equal to the sample quantitation limit,then an observed release is established as follows: If the background concentration is not detected (or is less than the detection limit),an observed release is established when the sample measurement equals or exceedsthe sample quantitation limit. If the background concentration equals or exceeds the detection limit, an observedrelease is established when the sample measurement is three times or more abovethe background concentration.In the discussions that follow in Sections 4 through 9, these criteria are used to determinewhether a release of MC has occurred in sediment and groundwater regardless of whether theanalyte is considered a hazardous substance. However, these criteria are not applied for soilsbecause a statistically based determination of background has been established, and anexceedance of the 95 th UTL or 95 th percentile, depending on the individual analyte, is used toestablish a release of MC.3.6.2 Human Health ScreeningHuman health screening values for soil and sediment analytical results were established using theEPA Region 9 Preliminary Remediation Goals for Residential Soil. Note that in recent meetingswith ODEQ for other FUDS, they indicated that EPA Region 6 Preliminary Remediation Goalsshould be used for all new sites in Oregon. Table 3-3 lists the human health screening valuesthat were agreed to during the TPP process. Selection of screening levels is shown in the TPPMemorandum included as Appendix B in this SI Report.3.6.3 Ecological ScreeningAccording to the Screening-Level Ecological Risk Assessment (SLERA) Guidance for FUDSMMRP Site Inspections (USACE, 2006), only sites that are considered to be IEP or are to bemanaged for ecological purposes, require a SLERA. As shown in Table 2-2, the Boardman AFRdoes meet some of the 33 criteria for designation as an IEP. Table 3-4 lists the ecologicalscreening values that were agreed to during the TPP process. Shaw developed a SLERA(Appendix L) using ecological screening values obtained from ODEQ (2001) and otherappropriate sources as described in the TPP Memorandum included as Appendix B in this SIReport.3.7 Variances from the SSWPThere were no variances to the SSWP.3.8 Second TPP MeetingA second TPP meeting was held via conference call on September 5, 2007. The meeting washeld with stakeholders to present and discuss the SI findings and to reach consensus regardingBoardman AFR Final SI Report.doc 3-8 Contract No. W912DY-04-D-0010 Delivery Order No. 003September 2007