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0 9 <br /> TECHNICAL MEMORANDUM <br /> Evaluation of Bed Ash Disposal <br /> Forward Landfill <br /> San Joaquin,California <br /> November 1, 2016 <br /> Page 11 <br /> function of low leakage rates and the relatively thick vadose zone between the bottom of the <br /> landfill and the groundwater table. Based on these findings, it can reasonably be concluded that <br /> the potential leaching of copperfrom the bed ash and subsequent leakage(should it occur)would <br /> have no measurable effect on groundwater quality below or adjacent to the site. <br /> SUMMARY OF MULTIMED EVALUATION RESULTS <br /> ITEM I UNITS I AREA 1 1 AREA 2 1 AREA 3 AREA 4 <br /> Alternative 1(Larger Area,Higher Leakage,Shorter Source Duration) <br /> Predicted Maximum Well Concentration mg/L 1.77E-07 5.60E-07 4.08E-08 8.21E-09 <br /> Transient Dilution Attenuation Factor no units 1.81E+08 5.72E+07 7.73E+08 6.21E+09 <br /> ------------ <br /> Time Required to Reach Maximum yrs 22,000 11,600 20,600 41,200 <br /> Typical Method 6010 Detection Limit for Copper mg/L 0.0011 0.0011 0.0011 0.0011 <br /> Concentration>_Method 6010 Method Detection Limit no units NO NO NO NO <br /> Multiple Required for Detection no units 6,211 1,965 26,981 133,983 <br /> Alternative 2(Smaller Area,Lower Leakage,Longer Source Duration) <br /> Predicted Maximum Well Concentration mg/L 5.46E-10 1.04E-09 2.90E-11 6.92E-13 <br /> Transient Dilution Attenuation Factor no units 5.86E+10 3.09E+10 1.09E+12 7.37E+13 <br /> Time Required to Reach Maximum yrs 679,000 679,000 2,570,000 14,000,000 <br /> Typical Method 6010 Detection Limit for Copper mg/L 0.0011 0.0011 0.0011 0.0011 <br /> Concentration z Method 6010 Method Detection Limit no units NO NO NO NO <br /> Multiple Required for Detection no units 2,015,390 1 1,062,802 137,931,034 1,589,136,088 <br />