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i4r i TABLE 2 Solt Analytic Results for Vaults 7 and 8 - Diamond Walnut Growers, Stockton, California Sample Total Tot Soluble SoluW Soluble Total Total Total Total Sample Depth Date Analytic Cr Cr Total Cr Cr Cu Na Ca50 Cl ID (ft)a Sampled Laboratory <------------------------------------------------- 4 mg/kg (ppm)------------------------------ 88-8 50.0 01/16/91 Clayton --- --- --- --- --- --- --- --- 1,700 88-8 50 6 01/16/91 Clayton --- --- --- --- --- 350 5,600 --- --- B8-B 55 6 01/16/91 Clayton 27 1 6 0 4 --- --- --- --- ... .._ Vault 6 11 2 12/15/88 Clayton --- --- 0 03 --- 0.38 220 78 970 200 (background) Vault 7 & 8 10 9 12/15/88 Clayton --- --- 0.14 --- 0 67 150 130 120 350 (background) Extraction Method 3050 D1 WET WET WET 3050 3050 DI DI Analytic Method 6010 7196 6010 7196 6010 6010 6010 375 4 325 3 DHS STLC :5W NA �NA 560 5 0 25 NE NE NE NE DHS TTLC 2,500 500 NA NA 2,500 NE NE NE NE Abbreviations Anal tical Laborator - Cr+6 Chromium Clayton = Clayton Environmental Consultants, Inc of Pleasanton, Cr = Hexavalent Chromium California Cu = Copper Na = Sodium Extraction/Analytic Methods Ca = Calcium so = Sulfate 4 3050 = EPA Method 3050, Nitric Acid Digestion Cl = Chloride WET = California Administrative Code, Title 22, Waste Extraction Test ppm = parts per million DI = Deionized water dilution --- = Not analyzed 6010 = EPA Method 6010, Inductively Coupled Argon Plasma (ICRP) DHS = California Department of Health Services 7196 = EPA Method 7196, Colorimetric STLC = DHS Soluble Threshold Limit Concentration 375 4 = EPA Method 375 4, Turbidimetric TTLC = DHS Total Threshold Limit Concentration 325 3 = EPA Method 325 4, Titrimetric NA = Not applicable 325 2 = EPA Method 325 2, Colorimetric NE = STLC and TTLC not established <n = Not detected at detection limits of <n ppm Notes a = Depth in feet below ground surface A Cn O n1 i