Wastewater characteristics

Influent

Month	Flow (mgd)	CBOD Avg. Mg/L	CBOD lbs./day	TSS Avg. mg/L	TSS lbs./day
Jan-07	7.466	144	9,007.20	120	7,506.00
Feb-07	6.067	173	8,801.20	145	7,376.73
Mar-07	6.025	159	7,956.36	148	7,405.92
Apr-07	6.178	150	7,756.20	140	7,239.12
May-07	4.492	210	7,881.30	174	6,530.22
Jun-07	4.094	225	7,693.65	190	6,496.86
Jul-07	4.044	217	7,239.10	184	6,138.24
Aug-07	3.916	269	8,749.49	191	6,212.46
Sep-07	4.002	267	8,907.12	193	6,439.48
Oct-07	4.793	230	9,207.36	186	7,445.95
Nov-07	4.611	259	9,936.27	187	7,174.06
Dec-07	6.957	161	9,399.18	139	8,114.82

Design Data

Parameter	Design mg/L	Design lbs./day	Annual Daily Avg. mg/L	Annual Daily Avg. lbs./day	Lbs. percent of design
CBOD	220	18,348	205	8,890	48
TSS	200	16,680	166	7,199	43

Effluent 2007

Month	CBOD mg/L	CBOD lbs/day	TSS mg/L	TSS lbs/day	NH3 mg/L	NH3 lbs/day
Jan	7	437	4	250	0.52	33
Feb	6	305	7	356	4.42	225
Mar	3	150	4	200	0.35	17
Apr	3	155	3	155	0.1	5
May	5	188	6	225	0.39	15
Jun	3	103	4	137	0.7	24
Jul	3	100	5	167	0.36	12
Aug	3	97	6	195	0.54	18
Sep	3	100	10	333	1	33
Oct	5	200	9	300	0.43	17
Nov	6	230	13	498	1.05	40
Dec	12	700	16	934	6.81	397

FECALS 2007

2007	May	June	July	Aug.	Sept.	Oct.
Fecal #/100 ml	103	41	28	360	206	318

NPDES Permit Level

	Discharge limitations		Discharge Loading (lbs/day)		Actual Annual discharge
Parameter	30 day	7 day	30 day	7 day	Daily avg. mg/L	Lbs/daily avg. loading
CBOD mg/L	19	28.5	265	1,060	0.2	8.8 lbs
TSS mg/L	22.8	34.2	265	1,060	0.2	8.8 lbs.
NH3 mg/L*	1.6*	2.4*	3.9	15.6	0.09	3.97 lbs.
	10.2	15.3
Fecal #/100 ml*	1,000	2,000	91	22.7	-	-

The City of Fairfield currently has no limitations on metals except total mercury.
Sample frequencies are as follows: one per two-week period: nitrogen, silver, lead and mercury; one per month: zinc, chromium total, chromium dissolved, nickel, copper, cadmium and cyanide.

Effluent Characteristics in UG/L (2007)

Month	CN*	Ag*	Cd*	Cr-T*	Cr-D*	Cu*	Pb*	Ni*	Zn*	Hg*	P*	O&G*
* = Summer only; AA = Below detection limit
Jan.	0	0	0	0	0	0	0	0	17.6	3.2	0.33	0
Feb.	0	2.07	0	0	0	6.64	0	0	49	0	1.58	0
Mar.	0	1.61	0	0	10.1	0	0	0	36	1.3	2.06	0
Apr.	0	3.11	0	0	0	6.26	0	0	41.6	1	2	0
May	0	3.71	0	0	0	10.2	0	0	60.1	2.9	4.5	0
June	0	3.55	0	0	0	10.8	0	0	67.3	1.9	3.38	0
July	0	3.18	0	0	0	9.44	0	0	56.2	3	0.82	0
Aug	0	3.16	0	0	0	10.3	0	0	67.2	2	2.6	0
Sept.	0	1.01	0	0	0	13.8	0	0	58.8	0.6	3.49	0
Oct.	0	6.16	0	0	0	11	0	0	60.3	2.5	1.58	0
Nov.	0	3.61	0	0	0	7.33	0	0	61.27	1.6	3.53	0
Dec.	0.009	2.33	0	0	0	12.2	0	0	35.4	3.9	3.39	0

Last updated: 6/25/2008