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Phase II Site Aseeesme or Alden Park Area Chevron Pipe Line Company Tracy, California ' TABLE 9 SUMMARY OF GROUNDWATER CHEMICAL TEST RESULTS - METALS, CHLORIDE AND TDS HELL6 REGULATORY STANDARDS DETECTION Up-gradient Adjacent to FIELD DRINKING WATER STANDARDS(2) PROPOSED(3) LIMIT (Background) Concrete Slab Dove-gradient BLANK p�rime�r' Seconder EPA MCLC PARAlD:IER(1) (mR/i) MH-2 RV 3 MW-3 MW-1/KJC (vg/I) Td---p7 Antimony 0.1 *(4) x • + + - Arsenic 0.005 0.053 0.024 0.053 0.012 * 0.05 = 0.050 • Barium 0.03 0.89 0.84 1.1 0.32 * 1.0 1.5 Beryllium 0.01 + + + • + Cadmium 0.05 + + * * + 0.010 - 0.005 Chromium (tot) 0.04 0.12 + + * + 0.05 0.12 Chromium (VI) 0.005 0.007 0.006 0.007 • e _ Cobalt 0.04 + + • x • _ - Copper 0.02 0.15 1.3 Lead 0.2 + * + * e 0.05 - 0.020 Mercury 0.0005 + • x + * 0.002 0.003 Molybdenum 0.2 + • + + • - Nickel 0.05 0.11 Selenium 0.005 + • + • * 0.01 0045 Silver 0.01 + + • x . Thallium 0.3 x + • + + _ - - Vanadium 0.05 0.23 * 0.15 0.10 0.05 - _ Zinc 0.01 0.25 0.11 _ 0.14 0.08 0.04 - 5.0 _ Chloride 30 340 460 DID(6) 330 + _ 250 Total Dissolved - Solids (TDS) 2 2,100 1,500 1,600 1,700 380 - 500 - NOTES: • (1) Analyses performed by ANATEC Laboratories, Inc., Sante Rosa, CA. (2) Title 22, CAC, Articles 4 and S. The purpose of the primary drinking water standards is to protect human health, while the purpose of the secondary drinking water standards is to protect the taste, odor and appearance of drinking water and to protect pipes and fixtures. (3) Federal Register, July 8, 1987. MCLG - Maximum Contaminant Level Goal. MCLG's are non-enforceable health goals which are to be set at the level at which no known or anticipated adverse effects on the health occur and which allow an adequate margin of safety. (4) * - Not detected at method detection limit. (5) - - No value currently exists. (6) UID - Unable to determine due to insufficient sample. BFAIOA/AT9