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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />Total Sulfur and sulfate (504) (both by EPA Method 300) - quantifies the total <br />concentrations of these chemicals in both soil and ground water. <br />Total Extractable Petroleum Hydrocarbons (TPH) (EPA Method 8015 with silica gel <br />pretreatment) - quantifies the concentration of petroleum hydrocarbons with limited <br />interference from naturally-occurring (polar) biogenic soil hydrocarbons. <br />Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) (EPA Method 8020) -quantifies <br />the concentration of these volatile aromatics associated with coal and petroleum coke. <br />Polynuclear Aromatic Hydrocarbons (PAHs) (EPA Method 8270) -quantifies the <br />concentration of PAHs associated with coal, coal tar and petroleum coke. <br />Ground Water Analytical Methods <br />Total dissolved solids (TDS) (EPA Method 160.1) - measures the total concentration of <br />dissolved materials, including anions, cations, and uncharged solutes (inorganic and <br />organic) and is used a general indicator of water quality. <br />Alkalinity (Method SM2320B) - is the acid neutralizing capacity from free bicarbonate, <br />hydroxide, and carbonate, and aids characterization of TDS, EC, pH. <br />Electrical Conductivity (EC) (field measurement) - a direct measure of the electrolyte's <br />capacity to conduct electrical current and is directly proportional to their concentration. <br />Acid generating or neutralizing processes can elevate EC. <br />Ca, Mg, K, Na (EPA Method 6020) - quantifies the major cations in most ground waters, <br />is conventionally used to discriminate between major ground water types, and is useful <br />in graphical representation of ground water characteristics. <br />Cl, NO3 (as nitrogen) (EPA Method 300.0)- quantifies the major species, in addition to <br />alkalinity, comprising the most common anions in ground water. Comparison with the <br />major cations will be used to establish the anion-cation balance and verify that the major <br />solutes have been measured and accounted. <br />Dissolved Cu or dissolved Ni, V (EPA Method 6010B/7400) - quantifies dissolved <br />metals concentrations in water. Samples to be analyzed for dissolved metals <br />concentrations will be filtered at the laboratory using a 0.45 j_tm filter prior to sample <br />preservation. <br />Title 22 Metals: Sb, As, Ba, Be, Cd, Cr, Co, Cu, Pb, Hg, Mo, Ni Se, Ag, TI, V, and Zn <br />(EPA Method 6010B/7400) - quantifies dissolved metals concentrations in water. <br />Samples to be analyzed for dissolved metals concentrations will be filtered at the <br />laboratory using a 0.45 urn filter prior to sample preservation. <br />July 2005 Page 14 Environmental Risk Services Corp.