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V 100-YEAR WATER BALANCE FOR THE GEORGE REED MUNN&PERKINS AGGREGATE FACILITY SAN JOAQUIN COUNTY,CALIFORNIA _ Settling Ponds Precip., Evap. Inflow,ac-in. Outflow,ac-in. Volume,ac-in Depth, Area, Month in in WW Precip. Evap. Pere. Recy. Change Net It Be (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (Il) (12) Jan 4.00 0.95 988.8 49 3.7 1,189.4 0 -156 186 5.73 3.93 Feb 3.59 1.40 1,143.7 44 5.5 839.5 0 342 529 2.43 3.76 Mar 3.36 2.90 1,225.5 41 10.9 1,527.6 0 -272 257 10.03 4.16 Apr 2.41 4.28 1,208.7 29 17.8 1,063.2 0 157 414 4.58 3.87 May 1.51 6.46 1,142.7 18 25.0 1,365.0 0 -229 185 7.96 4.05 Jun 0.46 8.18 1,298.9 6 33.1 962.0 0 309 494 3.25 3.80 Jul 0.16 8.93 1,164.9 2 33.9 1,528.4 0 -395 99 10.04 4.16 Aug 0.22 7.55 1,375.7 3 31.4 904.9 0 442 540 2.12 3.74 Sep 1.17 5.46 1,181.6 14 20.4 1,626.1 0 -451 90 11.97 4.27 Oct 1.73 3.61 1,258.1 21 15.4 987.5 0 276 366 3.17 3.80 Nov 2.80 1.77 1,038.4 34 6.7 1,417.9 0 -352 14 9.23 4.12 Dec 3.75 0.98 1,190.7 46 4.0 904.1 0 328 342 2.11 3.74 Total 25.16 52.48 14,217.8 306 208.1 14,315.6 0 Total pond catchment area,ac: 12.17 Percolation Rate,in/hr: 2.38 Estimated value within the range established by Kleinfelder Geotechnical Report dated 12/28/05. Allows for reduced permeability due to sedimentation of fines. See now 7. Maximum pond storage,ac-ft: 72.4 Volume is determined from topographic survey conducted by NorhStar Engineering Group, dated 12/05.Assumptions include constant side slopes and bottom elevations for each pond. Maximum storage volume of 72.4 acre-feet includes three(3)ponds said 2 feet of freeboard. (1) Water balance begins in January (2) 100-yr annual precipitation depth of 25.16 inches for Escalon is a weighted average of 119 years of precipitation data for Oakdale and Modesto provided by the California Department of Water Resources.The annual value is distrubuted monthly in accordance with mean monthly precipitation patterns. (3) Average monthly evaporation data from California DWR CIMIS. (4) Water inflow equals daily wastewater flow times days per month.See Reference Table A for monthly wastewater flows based on plant production. (5) Precipitation inflow equals precipitation(2)times total pond catchment area of all three ponds+runoff from areas tributary to ponds. Runoff calculations use an average coefficient of C=0.45 for all areas except ponds,where C=1.0. Acreage of each mnoff area is shown on Exhibit H of the ROWD Technical Report. (9) Evaporation outflow equals evapotranspiration(3)times pond water surface area(12)from previous month. (7) Pond percolation estimated as a function of submerged side slope area of all ponds and fractional amount through bottom of perc pond. (8) Recycle outflow equals zero as the plant does not regularly recycle from ponds(facility operations do not require a recycle stream). (9) Volume change equals ww inflow+precipitation inflow-evaporation outflow-percolation outflow-recycle outflow, (10) Net volume equals mooing total of volume change(9),beginning in January. (11) Pond water depth estimated from pond geometries and topographic field survey acquired 12/05. (12) Pond water surface area estimated as a function of net volume(10). Wastewater Generation Data,gpd Peak gpd: 2,202,021 Average Daily: 1,057,661 Dry Season Avg: 1,095,529 Wet Season Avg: 1,020,882 F:\06398 Munn 6 Perkins Aggregate Facility\MP Balance v4 Page 1 of 2