ScLA. We would like to submit the attached City of Soledad 2007 Annual Discharger Engineering

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1 ScLA March 28, 2008 Mr. Roger Brggs Executve Offcer Central Coast Regon Calforna Regonal Water Qualty Control Board 895 Aerovsta Place, Sute 101 San Lus Obspo, CA Subject: Attenton: Cty of Soledad 2007 Annual Report Mr. Tom Kukol Dear Mr. Brggs: We would lke to submt the attached Cty of Soledad 2007 Annual Dscharger Engneerng Techncal Report and supportng documents n complance wth Order No. R Provson E. If you have any questons, please call me at Sncerely, LI, L Peter Le Senor Engneer 248 Man Street, Soledad, CA 93960

2 L. Engneerng Techncal Report Ths secton of the Annual Report evaluates performance and capacty wth respect to the treatment and dsposal systems detalng: 1. nputs and outputs 2. precptaton 3. nfltraton/percolaton 4. evaporaton Gallons Gallons Gallons Gallons Plant A Flows Total Q Average Q Max Q Mn Q January 64,584, 744 2,083, 379 2,407, 903 1,870, 488 February 58,569, 567 2,091, 770 2,290, 925 1,913, 493 March 63,852, 797 2,059, 768 2,395, 184 1,809, 796 Aprl 66,107, 303 2,203, 577 2,737, 546 1,921, 885 May 63,679, 428 2,054, 175 2,532, 013 1,693, 109 June 36,738, 669 2,041, 037 2,184, 437 1,731, 833 July 65,429, 600 2,110, 632 2,570, 500 1,150, 500 August 64,663, 800 2,085, 929 2,769, ,000 September 66,688, 700 2,222, 957 2,503, 900 1,964, 700 October 63,841, 680 2,059, 409 2,314, 000 1,571, 050 November 60,095, 320 2,003, 177 2,343, 600 1,733, 000 December 62,332, 580 2,042, 986 2,387, 900 1,741, 700 Annual Total 737,584, ,058, ,437, ,489, 804 Average PLC down for twelve days durng June Plant "A" Flows In MGD Ave Flow -0-Max Flow 3,000, 2,500, 000 2,000, ,500, ,000, VI NO 1"/ The ssues wth flow meters, although ongong, are beng resolved and an update wll be ncorporated nto the 2008 Quarterly Report. Average Plant "A" Flow mantaned a greater than 750,000 GPD unused capacty through out

3 Gallons Gallons Gallons Gallons Plant B Flows Total Q Average Q Max Q Mn Q January 34,101, 956 1,100, 063 1,100, 127 1,100, 002 February 30,801, 248 1,100, 045 1,100, 102 1,100, 001 March 34,101, 723 1,100, 056 1,100, 105 1,100, 004 Aprl 33,002, 157 1,100, 072 1,100, 136 1,100, 017 May 34,102, 052 1,100, 066 1,100, 128 1,100, 015 June 19,800, 721 1,100, 040 1,100, 090 1,100, 001 July No August Data September Inputs October 16,164, ,439 1,446, November 12,027, , , ,600 December 12,655, , , ,340 Annual Total Average PLC and Data Lnes Down; Md June, July, August, and September. The ssues wth the Flow Meters and the Dverter Valve Controls are beng resolved and Dverson to the Prson Plant s beng accomplshed by hand operaton. Plant B Flows 2007 Total Q -a+ Average -- Q! 40,000, ,000, 30,000, ,000, 20,000, ,000, - 10,000, 000 5,000, 6 6 6\ P9 J 5 F P oho F 5 2 Q Q The Hydraulc Balance data s gathered from a complaton of n -house readngs data and area wde monthly humdty data. 6

4 Annual Percolaton Pond Data 2007 Ranfall Evaporaton Plant A Hydraulc Balance Plant B Hyd. Bal. Total Feet Total Feet RIBs # MGD RIBs # MGD January &4& &2& 3&5 1.4 February &4 & &3 5& 1.4 March &4 &7 & &2& 35& 0.63 Aprl &4 &7 & &2& 3& May &7 & &2& 3& June &7 & &2 &3 &5 0.6 July &6 &7 & &2 &3 & August &6 & &2 &3 & September & &2& 3& October & &2& 3& November & &283& December & &2& 35& ac 12.8 ac Total Ave 2.42 Ave Ave 0.68 Ave Plant (A) Hydraulc Balance: Wth 5.31 ft 2007 Ranfall mnus 2.44 ft 2007 Evaporaton equalng 2.87 ft tmes 104 acres equals ac/ft/ yr x 325,851 g/ac ft - =( 97.3 MG /vr) 365days / /yr= 0.267MGD. The 2007 annual Plant (A) nfluent was MG /365= 2.02MGD, therefore, = 2.29 MGD dsposed of by percolaton durng Wth 2 feet of freeboard remanng through out the Plant there remaned 245 MG ofunused capactyfor the year. Average Montorng Well Depths Inches Jan 200A_ - P Feb 10 Mar O Apr May ' 100.0' 1 OJun I'! Jul 50.0 I ' 0 Aug May Sep Sep M aoct LC) Jan D Nov Well # O Dec 7

5 Plant (B) Hydraulc Balance: Usng the same ranfall to evaporaton balance of 2.87ft tmes 16.8 acres equals 48.2 ac /ft/yr. Therefore, 42.8 ac /ft/yr x 325,828 g/ac -ft = 15.7 MG yr / MG /yr nfluent = MG percolated for the year. The hgh rate was accomplshed durng a perod where the montorng well data ndcates and average ground water level at ffty (40) nches lower that annual average. Plant B Montorng Wells Average Depths For 2007 In Feet Well 1 Well 2 Well 3 January February March Aprl May June July August September October November December Average Concluson: By all ndcatons the Plant (A) and Plant (B) dsposal systems are operatng well wthn requred capacty lmts. Plant B Montorng Wells Inches October j January February CI March Aprl May I June 1 July 100 July August 50 APnl I September 0 - January e October N co November I I) December 8

6 Plant (A): Water qualty results for 2007 are hghlghted by lmt breaks for BOD and TSS as follows: Plant A Effluent Water Qualty TKN Ntrate TSS TDS Sodum BOD5 Ntrte Chlorde Sulfate(o) ph January February March Aprl May June , July ND August September 21.9 ND October November December Average Lmts To Plantafluent_ TKN _ Ntrate TSS CL OL Sodum TDS ; tea._ I- Ammon r-- _` _- X W a I BOD5 6 1, --- Ntrte Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1 ChInrrle The TSS lmt was exceeded for the year by 12 PPM average, all other lmts were met. 9

7 Plant (A): Plant A Montorng Wells Water Qualty Average TKN Ntrte Ntrate Boron TDS Sodum Sulfate March June September December Lmts Montorng Well Data Plant "A" L" I ' -+- r TKN Ntrte m a r j + Ntrate Boron TDS Sodum Sulfate Chlorde 0.00 IN Mar Jun Sep Dec Overall the water qualty results show the ground water to be wthn objectves for the Salnas Rver Sub -basn Plan. 10

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