ARCHIVED REPORTS_LIMITED PHASE II ENVIRONMENTAL SITE ASSESSMENT AND SUMMARY OF PROJECT TO DATE

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• ,tat?- 1 result._ Normally, a 90-day rain season has been used for the Tracy area. This ea. 2 falls within Zone 3 of the San Joaquin County Mean Annual Precipitation map, he 3 driest category. Thus, as reflected in Trial Exhibit 36 (the UC Extension Handbook) 4 the 180-day rainy season criterion is used only in the most wet areas. I have 5 concluded that the 3 million-cubic-foot capacity of the three-pond system constitutes a 6 significant, oversized system. In my opinion, the retention pond for this Dairy wo d 7 be sufficiently adequate using the criteria described above if it is approximately 8 1.54 million cubic feet. I have compared this calculation to the rule of thumb in 9 Exhibit 36 which results in a capacity of 1.116 million cubic feet using a 120-day rain 10 season and 837,000 cubic feet for a 90-day rain season. The rule of thumb calcula 'on 11from the same source would yield 1.674 million cubic feet for a 180-day rain season. 12 Using a San Joaquin County Health Department guideline of 110 gallons of discharge 13 per cow, I came up with approximately 1.1 million cubic feet over a 120-day rain 14 season and 820,000 cubic feet over a 90-day rain.season. These calculations do not • 15 take into consideration the fact that the Dairy has a 250,000 cubic foot pre-settle ent 16 manure storage area used to store corral manure in the winter. In sum, the over- 17 sizing of the ponds provides a significant margin of safety. It provides a redundnicy 18 factor of 100% using the conservative 120-day rain season approach, meaning it is at 19 least twice as large as needed. My calculations do not take into consideration a 20 reduction in demand on the ponds should roof structures be constructed over the 21 corrals- U) �lu! K,2iv Ft rQ4 � 22 6. I am also preparing plans for the construction and reinforcement 01 new 23 and existing berms on the perimeter of the property. The existing berm system on the 24 south and west sides of the property will be raised and re-compacted so that surface 25 flow from adjacent land to the south and the end of the Byron Bethany Irrigation 26 Canal on the southwest corner will be minimized. These berms are intended to divert 27 this flow around the Dairy pasture. In addition, the berms on the east side of the 28 corral will be constructed at a height sufficient to protect the corral from the on-flow . a. 4 Declaration of Dan R.Schack In Support Of Objections to Plaintiffs Proposed Statement of Decision