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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2003-0017 J <br /> VILLAGE WEST MARINA MAINTENANCE DREDGING PROJECT 2 <br /> SAN JOAQUIN COUNTY <br /> 7. During excavation, a pipeline will transport the dredged material slurry to the <br /> DMD site for settling and disposal. The DMD site is a 50.5 acre former <br /> wastewater treatment basin (Parcel No. 71-140-17) owned by the City of <br /> Stockton. In the DMD site, solids will settle out and the "effluent'or"return <br /> water" will be discharged back into 14-Mile Slough by pump. The DMD site is <br /> designed for a 96-hour holding time to remove a significant portion of suspended <br /> material from the effluent. The disposal site has a maximum dredge material <br /> capacity of 125,000 cubic yards. <br /> 8. A pump will be used to decant water back to 14-Mile Slough. Noise levels <br /> generated by dredging and water return pumps will be in compliance with the <br /> San Joaquin County noise standard of 65 decibels for maximum outdoor noise <br /> levels in residential areas. Equipment soundproofing may be used to achieve <br /> compliance with the noise level standard. <br /> 9. The estimated rate of effluent discharge during the dredging operation is as <br /> follows: <br /> Effluent Average Flow(into receiving water): 2.70 mgd <br /> Effluent Maximum Flow(into receiving water): 3.00 mgd <br /> 10. The DMD site will fully contain dredged material and prevent any surface runoff <br /> or erosion into waters of the state, except for the effluent discharge described in <br /> Section D of this Order. After drying, the material may be removed for reuse at <br /> other locations. <br /> 11. The Discharger has performed analytical analyses of sediments to be dredged in <br /> order to determine the anticipated sediment quality during dredging operations. <br /> The sediment constituents and average concentrations found in dredge material <br /> are listed below. <br /> Average Concentration <br /> Solid analysis DI extraction Modified elutriate <br /> Constituent (mg/kg) (n/I) test (µg/1) <br /> Antimony ND (<lppm) 1.0 <br /> Arsenic 3.3 1.0 12.5 <br /> Barium 109.0 66.1 <br /> Cadmium ND (<0.3 ppm) ND (<1 ppb) ND (<0.04 ppb) <br /> Chromium 21.3 1.7 ND (<0.01 ppb) <br /> Copper 21.9 5.7 1.4 <br /> Lead 7.9 0.4 ND (<0.5 ppb) <br /> Mercury 0.04 ND (<1 ppb) 0.039 <br /> Nickel 18 2.0 ND (<1 ppb) <br /> Selenium ND (<0.5 ppm) ND (<2 ppb) <br /> Thallium ND (<0.5 ppm) ND (<0.2 ppb) <br /> Zinc 41 9 ND (<5 ppb) <br />