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Page 6 of 6 <br /> Cost to Retrofit Existing Dairies That Do Not Have Tier 1 Or Tier 2 Lagoons <br /> Using the 750 milk cow dairy again, changing the rainfall numbers to what is expected in the <br /> northern Sacramento Valley near Orland, the 750 milk cow dairy needs an additional 1.7 acres <br /> and costs are increased by roughly 50%. Adding an additional month of storage adds <br /> approximately another 7% to the cost. <br /> Conclusion <br /> The estimated costs provided in Table 1 are based on the minimum anticipated cost for the <br /> construction of an HDPE lined lagoon for a range of dairy sizes. These estimates are <br /> conservative (at an estimated higher cost) based on standardized assumptions that were <br /> outlined. However, when compared to each unique dairy situation additional cost drivers can <br /> easily increase the overall cost. These additional costs outlined in the Issues section can <br /> include location, groundwater conditions, manure and sand separation systems, higher rainfall <br /> areas than the south valley, and the length of the storage period. <br />