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Kennedy,/Jenks Consultants Section 3: Field Study . t This section presents the details of the proposed study. 3.1 Test Plots Intensive measurements of site assimilative capacity will be conducted using test plots at three locations (Figure 3): • Two plots in a former vineyard located near the Mokelumne River (referred to as the A Block). This plot will be used to plant and test various crops. • On an existing vineyard that has historically received process water via flood irrigation (either the H or A2 Block). This plot will be used to evaluate the combined assimilative capacity of vineyards and cover crops. The locations identified above will be used for intensive measurements for at least two growing seasons. In addition, other locations in the land application area will be monitored during the course of the study. In particular, soil water monitoring and water flux analysis will be conducted at other locations to assess the effects of crop cover, combined use of vines and cover crops, r � and irrigation uniformity on soil moisture status and percolation. The field study will consist of a detailed suite of measurements made on three test plots identified in Figure 3. Two test plots will be established in the A Block, which currently has a series of irrigation checks planted to 5 different test crops in replicated plantings: triticale, fescue, alkali mix, wheatgrass, and barley. The third test plot will be established in a vineyard location in either H or A2 Block. For spring 2008, plots will be irrigated using surface irrigation methods. In fall, 2008, the irrigation method may be revised as part of the process water treatment improvements. The test plots will be used to develop a salt balance and a nitrogen balance for each crop. Additional measurements of crop removal of constituents and the field soil water balance will also be made at other locations, as described below. Plot sizes will be at least 0.5 acres in order to a) provide a location for detailed sampling that is free from "edge effects" due to distance from adjacent crops and/or non-uniformity of irrigation and b) provide sufficient acreage for representative sampling of soils, crop uptake and biomass sampling. it 3.2 Monitoring Measurements and assessments that will be made at each test plot are described below. The basic components of the proposed field study are summarized in Table 1. A summary of the data that will be collected is included in Table 2. Crop Uptake and Assimilative Capacity Work Plan, Page 4 Woodbridge Winery, Acampo, California