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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0103 - 18 - CONSTELLATION BRANDS U.S. OPERATIONS, INC. dba WOODBRIDGE WINERY WOODBRIDGE WINERY SAN JOAQUIN COUNTY a. A video log of PW -2 identified that the well is cased from near surface to a depth of 103 feet bgs and that the well is uncased from 103 feet bgs to 120 feet bgs. An abandoned pump may be stuck in the well between 113 feet bgs and 120 feet bgs, which prevented further assessment of well construction and condition. Water quality data for PW -2 indicates higher TDS, EC, and other general mineral parameters, as compared to the other production wells that are screened in deeper water-bearing intervals. PW -2 is considered a potential vertical conduit due to the presence of holes in the upper 100 foot interval and because the well is uncased between 103 feet bgs and 120 feet bgs. b. Minimal information is known about Well X, which is an unused well located approximately 11 feet from PW -1 and 16 feet from PW -2. A downhole survey of the well identified that the well casing is damaged below 55 feet bgs, which also corresponds with the approximate static water level in the well. Further investigation indicated that the total depth of the well extends to 395 feet bgs, but well completion details below the damaged interval are unknown. Because of the casing damage near the shallow groundwater interval and unknown well construction details, Well X is considered a potential vertical conduit. c. PW -3 is located within the minimum horizontal separation distance of 100 feet to a known septic tank, and within 50 feet of a sanitary sewer line, as required by California Department of Water Resources Well Standard Bulletin 74-90. PW -3 includes five 20-foot screened intervals between 60 feet bgs and 311 feet bgs and is uncased between 311 feet bgs and 337 feet bgs. Although water quality data presented in the Potential Conduit Report did not indicate that PW -3 had been adversely impacted by wastewater constituents, PW -3 is considered a potential vertical conduit due to its proximity to the former stillage pond, current septic tank and sewer line, and its multiple screened intervals. 52. Production wells PW -2 and Well X both have failed casings and represent potential vertical conduits for waste constituents associated with winery operations. Production well PW -2 and Well X are in close proximity to PW -1, which is currently the primary production and drinking water supply well for the winery facility. Abandonment of PW - 2 and Well X is necessary to prevent vertical migration of wastewater constituents and for the protection of the current water supply for the facility. Because PW -2 and Well X should be abandoned and/or destroyed in a manner that that will not compromise the continued use of PW -1, it is appropriate to require the Discharger evaluate well abandonment and/or destruction options and take action as appropriate.2 53. PW -3 is a potential vertical conduit based on its well construction. Although PW -3 is used only for backup purposes and recent water quality data indicates that it meets drinking water standards, the well is located within the minimally prescribed horizontal distances from an active septic tank and sewer line. If future water quality monitoring data show exceedance of a drinking water standard, the well should properly destroyed. 2 For the purpose of this Order, well abandonment can include pressure-grouting or other sealing methods to prevent vertical migration of waste constituents and water within the well or filter pack between water-bearing intervals.