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suMMrr ENGINEERING,INC. SUTTER Holvll PRo.rcT NO. 2001015 Cousulling Civil Engineers Pond Performance Worksheet BY: Ano Partial-ARix,First Order Reduction Model Phase 2-100,000 TONS I ASSUMPTIONS j Influent water temperature 65 (leg,F - Ambienl Air Mouth Temperature PW Influent Pond I &2 Pond 3 Hydraulic Water BOD removal BOD Renmy;(I Hydraulic Water D011 removal BOD Removal Flow' BOD Detention Timee Temperature` rate constants Effluent BOD` Performance Detention Time Temperature` rate const:utls Effluent ROD' Perliirtnance (1') (gpd) (ntglL) (d) (deg.F) ((1-r) (ing/L) _ (d) (deg.F) ((I-r) (mg1l.) August 73 162,638 5,000 57 67 (1.273 301 94% 18 73 0.304 47 845o September 70 216,938 5,000 42 66 0.267 414 92% 13 70 0.287 90 78% October 63 262,296 5,000 33 65 0.258 519 90% 11 63 0.2511 140 73% November 52 166,899 5,000 51 61 0.241 376 92% 24 52 0.202 64 83% Dcccmber 45 141,570 5,000 58 58 0.228 350 93% 54 45 0.176 33 91011. January 45 397679 5,000 179 52 0.202 135 97% 112 45 0.176 7 95°% February 51 62,997 5,1100 124 58 0.225 173 97% 103 51 0.198 8 951". March 54 67,857 5,000 121 59 0.233 171 97010 102 54 0.2111 8 96% April 59 49,879 5,000 185 61 0.243 109 98% 194 59 0.231 2 98% May 65 46,238 5,000 225 65 0.260 84 98% 331 65 0.260 1 991'0 June 70 28,692 5,000 500 69 0.279 36 99% 147 70 0.287 1 98% July 74 38,683 5,000 320 71 0.292 53 99% 65 74 0.311 2 95% AVERAGE 47,719 5,000 236 62 109 _ 98% 151 60 —4 97% (a) Monthly inflow values from water balance. (b) HRT determined as average of slatting and ending monthly pond volume divided by average of monthly inflow and outflow. (c) Pond walur temperature determined using Bq 8-5 in Tchobanoglous,1998. (d) BOD removal constant determined using a k2o of 0.276 CIA and a temperature coefficient of 1,036. (e) Ellluent BOD determined using a first-order redaction,partial mix model,Ey.8-4 in 7'chobanoglous,1998. Page 8 of 8