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Wilk "Pi """I& 1i Ik "fir IP "No I& IL "& VW 16 Tabic 4 Site Parameters For Former Safeway Maat Packing Plant Stockton California Receptor Industrial/Commerical tndustrial/Commerical Comment on Parameter Values Symbol Parameter Units AME Average d Lower Depth of SurhCial Sod Zone cm 100 33 100 cm the ASTM default value is approximately 3 foot&is used to represent sod for a shallow excavation The average case is 33 cm(1 foot)which is the typical risk assessment definition of surface soil ER Enclosed Space Air Exchange Rate Vs NIA NIA Not Applicable to Safeway Site No Budding In Area of Concern foc Fraction of Organic Carbon in Sod g CIO sad 001 001 No data available on FOC,ASTM default value assumed hcop Thickness of Capillary Fringe cm 5 150 5 cm is the ASTM default 150 em is a typical capillary fringe height in a silt soil IFetter 1980► by Thickness of Vadose Zone cm 755 610 Depth of vadosa zone is the difference between depth to groundwater(760 cm or 25 feet}and height of capillary fringe I Infiltration Rate of Water Through Sod cmlyear 53 0 7 The annual precipitation in Stockton is 13 95 Inches(35 4 cm) (NOAA 1992) Paving at the site act$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 Volumellnhltration Area Ratio cm NIA N/A Not Applicable to Safeway Site,No Pudding In Area of Concern Lcrack Enclosed Space Foundation or Wall Thickness cm N/A NIA Not Applicable to Safeway Site No Budding 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 26 feet 4760 cm) Ls Depth to Subsurface Soil Source cm 100 730 Borings 6 15, 16, 17& 19 had measurable TPH at approximately 25 leet bgs A depth of 24 feet(730 cm)was selected based on the depth of tank field overexcavation(ERM 1993), 100 cm is the depth of TPH in the vicinity of the former diesel supply lines Pe Particulate Emission Rate 91cm"2 s 6 90E 14 0 The site is paved neither wind nor mechanical erosion of the sod surface will occur RME case value is the ASTM default value Uair Wind Speed Above Ground Surface In Ambient cm/s 225 370 Average wind speed in the Stockton area is 3 7 mis(ARB 1984) Mixing Zone 2 25 mis is the ASTM default value x lmarks%SAFEWAY2 XLW Page 1 of 2 2126196