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90189N-ALL CON-8 Woodward-Clyde Consultants terms of TTLC and STLC2 criteria established by the State of California for landfill disposal. State and federal health-based drinking water criteria usually serve as a reference point for groundwater. At the present time, the soil and groundwater contaminants probably do not present a significant risk to health and environment, although contaminated groundwater may infringe on the nondegradation policy for the basin. The view that there is no significant risk to health and the environment is based on the fact that: (1) the building and pavement covering the contaminated soil prevent human exposure by direct contact or inhalation of contaminated soil ; and (2) the affected groundwater is not being used for any beneficial purposes and, because of its relatively high salinity, cannot be used, without treatment, for any purpose that would result in appreciable human exposure. Endangerment to human health or the environment through the contamination of drinking water supplies is dependent on the leachabil (ty of the contaminants, their mobility, the proximity of the source of the contamination to existing or possible future drinking water suppliers and the toxicity of the chemical . Recent data (see Appendix R) show groundwater underlying the Navy Drive site contains concentrations of copper and lead which do not exceed drinking water standards. The water in the area is brackish and norpotable and not withdrawn for any known beneficial use other than industrial cooling, and therefore remediation of the groundwater is considered inappropriate. 2.6 CLEANUP LEVELS Potentially toxic chemical Substances found in the groundwater were copper, lead, nickel and tin. The concentrations of these metals found in water from the monitoring wells in Phase 2 of the RI are compared with drinking water standards and background levels in Table 2.2. No standard 2 STLC - Soluble Threshold Limit Concentration; defined in CAC, Title 22, 2-11 0Td WH EE:S F661 TF'"If ESOE SSE 9L6 :-Bl EDOMM FIZTTEn tealua9 ; Woad