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TABLE 2: RANGE OF OFF-SITE CONTAMINANTS OF CONCERN <br /> CONTAMINANT MUNICIPAL AND DOMESTIC WELLSa <br /> (Ng/L) <br /> Trichloroethane ND - <br /> 1,1-Dichloroethylene ND-3.5b <br /> Tetrachloroethylene ND <br /> Trichlorethylene ND-5.2b <br /> Copper ND-6c <br /> Lead ND-21d <br /> Silver ND-30C <br /> Mercury ND <br /> Notes: <br /> a Based on monitoring results obtained for samples collected by the RWQCB in 1987 <br /> and monthly and quarterly monitoring of CWS municipal wells (i.e. , CWS-77 <br /> between 7/88 and 12/88) . <br /> b Maximum concentration detected in water samples from CWS-77 municipal <br /> well--recent monitoring data indicate the levels are below EPA's Maximum <br /> Contaminant Level of 5 pg/L. <br /> c Cannot determine from information reviewed the origin of the maximum reported <br /> concentration. <br /> d Maximum concentration detected in water samples from Oak Park well. <br /> Ng/L Micrograms per liter or parts per billion (ppb) . <br /> ND Not detected. _ <br /> 6 <br />