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1 <br /> TABLE 10.VOLATILIZATION MODEL PARAMETER ASSUMPTIONS <br /> SOUTH SHORE PARACELS <br /> CITY OF STOCKTON HOUSING AND REDEVELOPMENT AGENCY <br /> STOCKTON,CALIFORNIA <br /> Vadose Zone <br /> Model Variable Abbreviation Soil Groundwater Unit. Source <br /> ' <br /> Depth(length)to va or sourceL w 30.48 Site-spec I cm Site-s ec <br /> Exchange rate indoor air ER 0.00014 0.00014 Usec ASTM,1995 <br /> Enclosed space volume/infiltration area indoor air Lb - cm ASTM,1995 <br /> Areal fraction of cracks in foundation indoor air n 0.01 0.01 cm''-cmcks/cm''-total area ASTM,1995 <br /> ' Slab crack thickness indoor air Lcrk 15 IS cm ASTM-1995 <br /> Conversion factor CFactor 1000 1000 <br /> Air-filled soil porosity vadose theta-as 0.26 0.26 cm'-air/cm'-soil ASTM,1995 <br /> Total soil porosity(vadose) theta-t(vad) 0.38 0.38 cm'-air/cm'-soil ASTM,1995 <br /> Water-filled soil porosity(vaclose) theta-s 0.12 0.12 cm'-water/cm'-soil ASTM,1995 <br /> Air-filled soil porosity(crack-indoor air theta-acrk 0.02 00..003 cm/cm-total volume 2 cm'-air/cm'-total volume ASTM,1995 <br /> Total soil porositycrack-indoor air theta-t crk 0.03 ' ' ASTM,1995 <br /> Water-filled soil porosity(cmck-indoor air <br /> theta-wcrk 0.01 0.01 cin>-air/CM3_Soil ASTM,1995 <br /> Soil porosity,air-filled,capillary zone Theta-aca 0.26 0.26 cm'-air/cm'-soil ASTM,1995 <br /> Total soil porosity(capillary zone theta-t ca 0.38 0.38 cm'/cm'-soil ASTM,1995 <br /> ' Soil Porosity,water-filled,capillary zone Theta-wca 0.12 0.12 cm'-water/cm'-soil ASTM,1995 <br /> [Height <br /> 5ofcal fringe he 0 0 cm Site-spec <br /> e zone by 30.48 Site-s ec cm Site-s ecrht-outdoor air s 200 200 ctn CalEPA 1994outdoor air U 358358cm/sec NOAA,1999ion area outdoors,parallel to wind direction) W Site-spec Site-spec cm Site-spec <br /> Notes: <br /> cm = Centimeters <br /> cm3 = Cubic centimeters <br /> L = Liters <br /> sec= Seconds <br /> bgs=Below ground surface <br /> Depth to groundwater assumed to be 25 feet bgs(762 centimeters) <br /> 200 cm used for residential scenario;300 cm used for commercial/industrial exposure scenarios(ASTM,1995) <br /> 'Climate Summary for Stockton Station 724920(1948-1992),downloaded from NOAA wordwide website. November 1999. <br /> °Based on site dimensions(Treadwell&Rollo,1999)and assumes prevailing wind from northwest direction(NOAA,1999): <br /> Are 510 ft=15,545 cm <br /> An 400 ft=12,192 cm <br /> Are 780 ft=23,774 cm <br /> Sources: <br /> ' American Society for Testing and Materials(ASTM). 1995. Risk-Based Corrective Action Applied at Petroleum Release Sites. Standard E 1739-95. <br /> National Oceanic and Atmospheric Administration(NOAA). 1999. Climate Summary for Stockton Station 724920(1948.1992),downloaded from the worldwide website. November. <br /> State of Califomia Environmental Protection Agency(CalEPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control. January. <br /> U.S.EPA. 1998. Region 9 Preliminary Remediation Goals(PRGs)1998. Physical Chemical Information Table. <br /> S�Mq 99.__'18 <br /> Pngc I or 1 1_,I ON9 <br />