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` FORMER AMERICAN FOREST PRODUCTS Appendix D Closure Summary Report July 2004 URS Project 17322736 Page D-3 • Have more than three carcinogens or five chemicals with similar noncarcinogenic health effects been identified(see Section 2.11)? No. • Other issues as applicable to the site. 4 No known issues to indicate the use of the tables to be inappropriate. 4. Soil and Groundwater Categorization(see Sections 2.4 and 2.5): • State the regulatory beneficial use of impacted or potentially impacted groundwater beneath the site; discuss the actual, likely beneficial use of groundwater based on measured or assumed quality of the groundwater and the hydrogeologic nature of the soil or bedrock containing the groundwater. �1 The shallow groundwater in the urban setting of this site is not now and unlikely in the future i to be considered for beneficial use. • Characterize the soil type(s) and location of impacted soil as applicable to the lookup tables (e.g., soil stratigraphy, soil texture and permeability, depth to and thickness of impacted soil, i etc.). • l Soils consist largely of silts and silty fine sands which would not enhance the introduction of —' indoor air pollutants to overlying buildings. Formerly impacted soils to a depth in excess of 20 feet have been removed and disposed of off-site and replaced with clean soil(See Section 4.1 of this report) 5. Exposure Point Concentrations (see Section 2.2, Step 7): t r • Identify maximum concentrations of chemicals present in impacted media. 1 a Maximum concentrations'in groundwater samples during the five quarters of groundwater 5 monitoring beginning in the second quarter of 2008 are presented in Table D-1. ' R f • Describe how alternative exposure point concentrations were determined(e.g., 95%UCLs), if proposed, and provide supporting data.For residential land use scenarios, sample data should be averaged over no more than a 100m2(1,000 ftz) area. For vapor intrusion concerns,groundwater, soil and/or soil gas data should not be averaged over the floor space area of existing or anticipated buildings. No data averaging was applied. • Discuss the need to evaluate groundwater data with respect to surface water standards for potential bioaccumulation of chemicals in aquatic organisms due to the size of the plume,the proximity of the plume to a body of surface water and the potential for minimal dilution of groundwater upon discharge to surface water(see Section 2.7). There are no vicinity surface water bodies, or surface water bodies within the range of the groundwater plume. • Discuss how background concentrations of chemicals were determined, if considered for use in the risk assessment(see Section 2.9). No background concentrations were determined. �t ' r K:SWprocews 227WAmerican Foremt Closure-Summary-Repori-RcvOl.doc