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� 4% � qa me Table 4 Site Parameters For Former Safeway Meat Packing Plant Stockton Caiifornla Receptor Industrfal/Commerical Industrial/Commerical Comment on Parameter Values Symbol Parameter Units RME Average d Lower Depth of Surficial Soil Zane cm 100 33 100 cm the ASTM delauft value is approximately 3 toot&is used to represent sod for a shallow excavation The average case is 33 cm I1 foot)which is the typical risk assessment definition of surface soil ER Enclosed Space Air Exchange Rate LIS N/A N/A Not Applicable to Safeway Site No Building In Area of Concern foc Fraction of Organic Carbon in Soil g C/g soil 001 001 No data available on FOC ASTM default value assumed hcap Thickness of Capillary Fringe cm 5 150 5 cm is the ASTM default 150 cm is a typical capillary fringe height in a silt soil(Fetter, 1980) by Thickness of Vadose Zone cm 755 610 Depth of vadose zone is the difference between depth to groundwater{760 cm or 25 feet)and height of capillary fringe fnfiltration Rate of Water Through Soil cm/year 53 07 The annual precipitation in Stockton is 13 95 inches(35 4 cm) INOAA 1992) Paving at the site acts as a impervious barrier for water,any water that infiltrates will also be subject to evaporation It was assumed that 2%of the rain will infiltrate for the average case& 15%will infiltration for the RME case LB Enclosed Space Vaiumelinfaltration Area Ratio cm NIA NIA Not Applicable to Safeway Site,No Duilding In Area of Concern Lcrack Enclosed Space Foundation or Wall Thickness cm NIA NIA Not Applicable to Safeway Site No Building In Area of Concern Lgw Depth to Groundwater cm 760 760 Over time the depth to groundwater has ranged from 24 to 30 fee in the tank field area Based on March 1995 data IERM 1995) the depth to water is about 25 feet f760 cm) Ls Depth to Subsurface Soil Source cm 100 730 Borings 8 15 16, 17& 19 had measurable TPH at approximately 25 feat bgs A depth of 24 feet(730 cm)was selected based on the depth of tank freld overexcavation{ERM 1993) 100 cm is the depth of TPH in the vicinity of the former diesel supply lines Pe Particulate Emission Rate g/cm"2 s 6 90E 14 0 The site Is paved neither wind nor mechanical erosion of the soil surface will occur RME case value is the ASTM default value Uatr Wind Speed Above Ground Surface In Ambient cm/s 225 370 Average wind speed in the Stockton area is 3 7 nils{ARB 1984) Mixm Zane 2 25 mis is the ASTM delault value x ImarkslSAFEWAY2 XLW Page 1 of 2 212619fi