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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0103 - 15 - CONSTELLATION BRANDS U.S. OPERATIONS, INC. dba WOODBRIDGE WINERY WOODBRIDGE WINERY SAN JOAQUIN COUNTY Well/ Source Average Result (mg/L, except as noted) TDS Nitrate-N EC1 Sodium Chloride Sulfate Dist. No. 12 288 1.0 418 20 16 7.2 Dist. No. 22 298 0.8 443 21 16 7.1 1 µmhos/cm 2 Sample obtained from facility water tap. GROUNDWATER CONDITIONS 44. Subsurface investigations conducted between 2001 and 2009 identified shallow sediments consisting of a mixture of sand/silt and sand intervals. Investigation activities included the installation and sampling of groundwater monitoring wells MW-1 through MW -14, in addition to the evaluation of other existing on-site wells. The current groundwater monitoring well network is shown in Attachment B. 45. The depth to shallow groundwater ranges from 3.2 feet bgs near the Mokelumne River on the southern end of the facility, to 68.6 feet bgs further to the north. Groundwater consistently flows away from the Mokelumne River to the north-northwest with a decreasing component of horizontal gradient laterally away from the river. This condition makes Mokelumne River a losing stream that recharges the shallow groundwater interval. 46. Average concentrations of selected constituents from groundwater monitoring results since 2001 are presented below. The location column identifies each well’s position relative to potential on-site waste constituent source areas and shallow groundwater flow direction. Well ID Mean Analytical Result (mg/L, except as noted) EC1 TDS TKN NO3-N SO4 Cl Na Location MW -1 153 60.9 1.0 ND 1.6 1.2 7.0 UP MW -2 367 288 0.6 0.2 28 17 11 UP MW -3 278 138 2.3 ND 1.6 19 25 UP MW -4 766 430 4.7 ND 1.3 37 53 DGP MW -5 1,008 724 0.6 15 62 67 35 DGLA MW -6 740 538 2.0 9.9 54 43 39 DGLA MW -7 768 577 1.4 12 96 26 53 DGLA MW -8 1,076 773 1.3 3.2 79 44 90 DGLA MW -9 942 655 0.6 3.8 59 55 58 CGLA MW -10 532 348 1.0 7.2 39 15 45 CGLA MW -11 684 506 0.9 15 54 35 40 DGWLA MW -12 157 170 0.6 1.2 4.3 7.4 10 UP MW -13 917 585 0.2 3.8 31 57 51 DGWLA MW -14 541 394 0.6 7.9 48 21 33 CG