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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />Organochlorine pesticides (OCP; EPA Method 8080), organophosphate pesticides (OPP; <br />EPA Method 8140) and polychlorinated biphenyls (PCBs; EPA Method 8080) were not <br />reported above detection limits in site soil samples. <br />The polynuclear aromatic hydrocarbons (PAHs; EPA Method 8270) fluoranthene and <br />pyrene were reported at concentrations of 0.21 mg/Kg and 0.24 mg/Kg, respectively, in <br />soil from MW-4 at 0.5 feet bgs. The semi-volatile organic compound (SVOC; EPA <br />Method 8270) di-n-butyl phthalate was reported in all samples from MW-1 and MW-4. <br />Dames and Moore attributed the reported di-n-butyl phthalate detection to likely <br />laboratory contamination based on detection of this compound in a laboratory method <br />blank. <br />2.2.2 Ground water sampling results - 1991 <br />Ground water samples collected from wells MW-1 and MW-4 in 1991 had reported <br />sulfur (EPA Method 6010) concentrations of 146 mg/L and 153 mg/L, respectively, and <br />sulfate (EPA Method 300) concentrations of 410 mg/L and 440 mg/L, respectively. <br />Sulfide (EPA Method 376.2) was undetected in ground water. <br />Arsenic (EPA Method 6010) was reported at concentrations of 130 micrograms per liter <br />(µg/L) and 60 pg/L in MW-1 and MW-4 ground water, respectively. <br />Chlorinated and organophosphate pesticides and PCBs (EPA Methods 608 and 614) <br />were not detected in site ground water samples. <br />TRPH (EPA Method 418.1) was not detected in ground water at MW-1 and MW-4 <br />Volatile organic compounds (VOCs; EPA Method 601) were not detected in site ground <br />water. <br />2.2.3 Ground water sampling results - 2003 <br />In 2003, ground water from monitor wells MW-2, MW-3, and MW-4 had reported <br />concentrations of sulfur (EPA Method 300) ranging from 466 mg/L to 588 mg/L, and <br />sulfate (EPA Method 300) concentrations ranging from 1412 mg/L to 1780 mg/L. <br />Dissolved nickel EPA Method 6010B) was reported at 0.4 and 0.3 mg/L in ground water <br />from MW-2 and MW-4, respectively. <br />Dissolved vanadium (EPA Method 6010B) was reported at 0.08 mg/L in ground water <br />from MW-4. <br />July 2005 Page 5 Environmental Risk Services Corp.