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Heidi Frey <br />May 6, 2011 <br />Page 2 <br />WWW. bbawater.com <br />SWSP Renewal Request for June 2011 through May 2013 Operations <br />For June 2011 through May 2013, Valco proposes to replace evaporative and aggregate operation <br />depletions in the same manner approved in the previous SWSP. Please note the pumps have been <br />removed from the two alluvial water wells at the Canon City East Pit and Rocky Ford East Pit and Valco <br />does not intend to pump from these wells in the future. Additionally, Valco has stopped gravel <br />excavation operations at all three pits; however, previously mined gravel inventory continues to be hauled <br />off-site at the Rocky Ford East Pit Also, Valco has retained all of the replacement water supplies used in <br />the previous SWSP. A summary of Valco's June 2011 through May 2012 projected annual depletions <br />and available augmentation water are provided in Table 1. Monthly accounting forms with the projected <br />June 2011 through May 2012 depletions and proposed replacement water for the Canon City East Pit, <br />Rocky Ford East Pit and Lamar East pit are attached as Tables 2, 3 and 4, respectively. Table 5 <br />summarizes the individual monthly accounting forms. Thomas E. Brubaker, President of Valco, has <br />indicated that Valco's June 2012 through May 2013 operations will be similar to the projected June 2011 <br />through May 2012 operations presented herein. The following provides a summary of the augmentation <br />methodology and accounting. <br />1, Exposed Surface Area The maximum expented ground water surface area that will he exposed <br />and requires replacement during the term of this SWSP totals 66.8 acres for all three pits, <br />summarized below. <br />June 2011 through May 2013 Exposed Water Surface Area Summary (acres) <br />Gravel Pit <br />Maximum <br />Exposed <br />Water Surface Area <br />Pre -1981 <br />Exposed <br />Water Surface Area <br />SWSP <br />Replacement <br />Water Surface Area <br />Canon City East Pit <br />Rocky Ford East Pit <br />Lamar East Pit <br />30.1 <br />47.3 <br />35.4 <br />15.4 <br />17.4 <br />13.2 <br />14.7 <br />29.9 <br />22.2 <br />Total 112.8 <br />46.0 66.8 <br />2. Water Depletions: Consistent with the previous SWSP, evaporative depletions for this SWSP <br />will be determined using the maximum exposed water surface areas less pre -1981 exposed water <br />surface areas, equal to the "SWSP Replacement Water Surface Area" shown above. The <br />quantification of the evaporative and operational water depletions are based on methodology <br />approved in prior SWSPs and aggregate demands projected by Valco. <br />a. Canon City East Pit and Lamar East Pit Lagging: The evaporative depletions from these <br />pits occur within 100 feet of the Arkansas River. Therefore, depletions to the river <br />system are considered instantaneous and will occur within the same month for the <br />accounting. <br />b. Rocky Ford East Pit Lagging: The evaporative and mining depletions from this pit are <br />greater than 100 feet from the Arkansas River. Therefore, the lagged effects on the <br />Arkansas River are included in the augmentation operations. As described in previous <br />SWSP requests, the projected pattern of total depletion from surface area evaporation was <br />lagged using the Glover -based Integrated Decision Support Alluvial Water Accounting <br />