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TABLE 2 <br /> TOTAL SLUDGE METALS CONCENTRATION <br /> City of Manteca <br /> Manteca's <br /> DHS Average TTLC <br /> TTLCa Valueb <br /> Constituent mg/kg mg/kg <br /> Arsenic 500 1.16 <br /> Barium 10,000 124 <br /> Cadmium 100 1.69 <br /> Chromium 500 7.06 <br /> Copper 2,500 89.6 <br /> Lead 1,000 24.4 <br /> Mercury 20 0.84 <br /> Nickel 2,000 7.16 <br /> Selenium 100 0.42 <br /> Silver 500 11.08 <br /> Zinc 5,000 182.6 <br /> Molybdenum 3,500 1.lC <br /> a Total Threshold Limit Concentration (TTLC) as listed in the California Administrative <br /> Code, Title 22, Section 66699 as persistent and bioaccumulative substance. <br /> b Sample collected from dried sludge. Average values collected from 1987 through 1990. <br /> C Dried sludge sample collected on 4/6/90. <br />