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• J Kennedy/Jenks Consultants objective of this improvement was to upgrade the west sump by increasing solids settling. These changes are expected to improve flexibility and control of discharge to the LAA for vineyard or other crop irrigation. From October 2003 to November 2004, cooling water lift station flows (north sump) were approximately 1,665 gpd, which constituted only about 2 percent of the permissible flow specified in the WDR (October 2003 to March 2004). In September 2004, BTQCLC began to change winery operations and, as of November 2004, is no longer producing non-contact cooling water. Some upgrades have already been made to the process water distribution system piping including increasing the size of the main N-S channel culvert from 12 inches to 36 inches. In addition, a connection has been constructed between the South San Joaquin Irrigation District (SSJID) pipeline and the BTQCLC piping system. BTQCLC plans to construct underground piping to the LAA checks to replace the current open distribution channel system. BTQCLC is planning to plant a combination of a) vineyards with cover crops, or b) grass hay within basins 1 through 4, the southern half of basin 5 and most of basin 7 (80 acres). This acreage will be irrigated using process water as well as supplemental irrigation water(South San Joaquin Irrigation District supply), if necessary. The objective of this project is to increase crop production and nutrient uptake within the LAA, thus improving soil quality. In addition, planting vineyards and cover crops will decrease percolation of process/supplementary water, as well as improve the land management by increasing BTQCLC's ability to manage soil treatment of process water chemical constituents (e.g., nitrogen and salt loading). In order to improve monitoring of the LAA, BTQCLC has constructed two new monitoring wells cross-gradient to groundwater flow. As shown in the Technical Report (Kennedy/Jenks, 2004a), these monitoring wells have already provided some data concerning the groundwater conditions underlying the Site. 1.5 Land Application Area Site Characteristics The soils of the LAA have been mapped as Delhi and Veritas series in the San Joaquin Soil Survey (USDA, 1992). According to borings drilled by Twining (Twining 2000), soils on the Site are sandy and silty with a textural change occurring from 11 to 20 feet bgs. Based on more recent investigation (Kennedy/Jenks 2004a), the subsurface material in the LAA mainly consists of a mix of silty layers, poorly graded fine- and medium-grained sand layers, and a distinct cemented "hardpan" layer at shallow depths. The hardpan was noted as a 2- to 3-foot thick cemented sand or silty sand, typically reddish brown in color except in one boring, where the hardpan had distinct black and gray mottling. The layer was found to be very dense, and fragments were brittle with many small pores. The top of the hardpan was encountered at 6 to 7 feet bgs in one boring and in monitoring wells MW-6 and MW-7 (drilled from the top of the berm surrounding the LAA), as well as at about 5 to 7 feet bgs in soil borings located in the basins. Other cemented layers were encountered in monitoring well MW-6 at 25 feet bgs, 35 feet bgs, 40 to 45 feet bgs, 45 feet bgs, and 55 feet bgs. Cemented and brittle material was encountered between 35.5 and 38 feet bgs in MW-7. Cemented material was not encountered deeper than Groundwater Investigation Work Plan Page 6 Barrel Ten Quarter Circle Winery, Escalon, California g:Gs-group\adminyobl031030118.08_barrelten109-reportslgw invest wrk pWtextdoc