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POfFV"I'I V.LI <br /> POTE.ViIALI.I SI(:A'FIU\T LF;SSTIIA\ <br />1S$LE~ SIC~IFIG~.AT C]LESS SICAIFIG~AT ~~ <br />~ <br />' SOIRCES <br /> ' <br />' ` IAII'At <br />I <br /> ISSLFS V11 <br />rIGA <br />llOS I>IPAC <br />I <br /> IACORPORA"fEU <br />TABLE 4-I <br />Sti'~'I>V'IARY OF SAN LEAN DRO SEDIMENT TEST REStiLTS <br />Constituent Area .~ Area A Area B Area C RWQCB 1992 Draft <br />(North) (South) Screening Criteria <br />(Wetlands Cover) <br />Silver(Ag) <1.0 <1.0 <].0 <1.0 LO <br />Arsenic (As) 4.6 <1.0 4.3 <1.0 33 <br />Barium (Ba) 36 35 4Z 45 nr <br />Beryllium (Be) <0.50 <0.50 0.62 <0.50 nr <br />Cadmium (Cd) 2.0 ?.4 2.4 3.0 5.0 <br />Cobalt (Co) 8.1 8.1 9.2 9.5 ur <br />Chromium (Cr) 50 43 51 56 220 <br />Copper (Cu) 2R 30 28 38 90 <br />Mercury (Hg) 0.22 0.15 0.23 0.16 0.35 <br />Molybdenum I.5 1.2 1.7 1.5 nr <br />(?vio) <br />Nickel (Ni) 49 47 S2 58 <140 <br />Lead (Pb) 18 7 5 19 21 <50 <br />Antimony (Sb) 23 <2.0 2.7 <20 nr <br />Selenium (Se) <2.0 <2.0 <2.0 <2.0 0.7 <br />Thallium (Tl) <1.0 <1.0 <1.0 <I.0 nr <br />Vanadium (V) 34 31 34 40 nr <br />"Zinc (Zn) 64 61 64 75 160 <br />Nr =Not recorded <br />SOURCE: Treadwell & Rollo (2003) <br />The proposed project does not introduce new development, structure, or impervious surfaces to the DMMS, therefore, the proposed <br />project and subsequent increased inundation of the DMMS is not expected to expose people or property to water-related hazards <br />such as flooding or tidal waves. <br />The proposed dredged material removal and subsequent increased inundation of the DMMS would not significantly alter the <br />direction or rate of flow of groundwater. No groundwater would be pumped from under the sire. The proposed project and <br />subsequent increased inundation of the DMMS is not expected to significantly increase the quantity of groundwater in the area. <br />The annual evaporation potential at the DMMS is relatively high, about 44 to 46 inches. This high evaporation potential, in <br />combination with the proximity to the Bay, concentrates salts in the soils and contributes to surface and shallow groundwater <br />salinity. Groundwater underlying the study area is considered to be brackish and unsuitable as a potable water supply. Because the <br />water at the site is not potable, Ibis project will not reduce the amount of water otherwise available for public water supply. <br />Sau Leandro Dredged Material Management Site 7 March / 2004 <br />Sediment Removal Project <br />