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No Further Action Request 4 * Section 5 0 <br /> Former American Forest Products Facility 2/16/2006 <br /> URS Project No 17322736 Page 5-3 <br /> No <br /> • Do impacts pose a heightened threat to sensitive ecological habitats (e g, presence of <br /> endangered or protected species)? <br /> No <br /> i <br /> • Have more than three carcinogens or five chemicals with similar nonearcinogenic health <br /> effects been identified(see Section 2 11) <br /> No <br /> • Other issues as applicable to the site <br /> No known Issues indicate the use of the tables is inappropriate <br /> 4 Soil and Groundwater Categorization (see Sections 2 4 and 2 5) <br /> I • State the regulatory beneficial use of impacted or potentially impacted groundwater beneath <br /> the site, discuss the actual, likely beneficial use of groundwater based on measured or <br /> assumed quality of the groundwater and the hydrogeologic nature of the soil or bedrock <br /> containing the groundwater <br /> The shallow groundwater in the urban setting of this site is unlikely to be considered for <br /> beneficial use <br /> ra Characterize the sod type(s) and location of impacted soil as applicable to the lookup tables <br /> (e g, soil stratigraphy, soil texture and permeability, depth to and thickness of impacted soil, <br /> etc) <br /> Soils consist largely of silts and silty fine sands, which would not enhance the introduction of <br /> indoor air pollutants to overlying buildings <br /> 5 Exposure Point Concentrations(see Section 2 2, Step 7) <br /> Identify maximum concentrations of chemicals present in impacted media <br /> Table 4 lists maximum concentrations of constituents detected in groundwater samples during <br /> the four quarters of groundwater monitoring during <br /> • Describe how alternative exposure point concentrations were determined (e g, 95% UCLs), <br /> if proposed, and provide supporting data For residential land use scenarios, sample data <br /> should be averaged over no more than a 100m2 (1,000 fh) area For vapor intrusion <br /> concerns, groundwater, soil and/or soil gas data should not be averaged over the floor <br /> space area of existing or anticipated buildings <br /> No data averaging was applied <br /> • Discuss the need to evaluate groundwater data with respect to surface water standards for <br /> potential bioaccumulation of chemicals in aquatic organisms due to the size of the plume, the <br /> proximity of the plume to a body of surface water and the potential for minimal dilution of <br /> groundwater upon discharge to surface water (see Section 2 7) <br /> E VProiects\URS\AI'P12005 DCA Investigation\HP Investigation Report\ArP 2005 Report WP-TE-Rev02 doc <br />