Appendix A to Subchapter L. Long-Term 2 Enhanced Surface Water Treatment Rule

Table 1. CT VALUES (MG•MIN/L) FOR Cryptosporidium INACTIVATION BY CHLORINE DIOXIDE¹

Log Credit	Water Temperature, ° C
	‹=0.5	1	2	3	5	7	10	15	20	25	30
(i) 0.25 …	159	153	140	128	107	90	69	45	29	19	12
(ii) 0.5 …	319	305	279	256	214	180	138	89	58	38	24
(iii) 1.0 …	637	610	558	511	429	360	277	179	116	75	49
(iv) 1.5 …	956	915	838	767	643	539	415	268	174	113	73
(v) 2.0 …	1275	1220	1117	1023	858	719	553	357	232	150	98
(vi) 2.5 …	1594	1525	1396	1278	1072	899	691	447	289	188	122
(vii) 3.0 …	1912	1830	1675	1534	1286	1079	830	536	347	226	147
1 Systems may use the equation to determine log credit between the indicated values: Log credit = (0.001506 x (1.09116)Temp) x CT.

Table 2. CT VALUES (MG•MIN/L) FOR Cryptosporidium INACTIVATION BY OZONE¹

Log Credit	Water Temperature, ° C
	‹=0.5	1	2	3	5	7	10	15	20	25	30
(i) 0.25 …	6.0	5.8	5.2	4.8	4.0	3.3	2.5	1.6	1.0	0.6	0.39
(ii) 0.5 …	12	12	10	9.5	7.9	6.5	4.9	3.1	2.0	1.2	0.78
(iii) 1.0 …	24	23	21	19	16	13	9.9	6.2	3.9	2.5	1.6
(iv) 1.5 …	36	35	31	29	24	20	15	9.3	5.9	3.7	2.4
(v) 2.0 …	48	46	42	38	32	26	20	12	7.8	4.9	3.1
(vi) 2.5 …	60	58	52	48	40	33	25	16	9.8	6.2	3.9
(vii) 3.0 …	72	69	63	57	47	39	30	19	12	7.4	4.7
1 Systems may use the equation to determine log credit between the indicated values: Log credit = (0.0397 x (1.09757)Temp) x CT.

Table 3. UV DOSE TABLE FOR Cryptosporidium, Giardia lambia, AND VIRUS INACTIVATION CREDIT

Log Credit	Cryptosporidium UV dose (mJ/cm2)	Giardia lambia UV dose (mJ/cm2)	Virus UV dose (mJ/cm2)
(i) 0.5 …	1.6	1.5	39
(ii) 1.0 …	2.5	2.1	58
(iii) 1.5 …	3.9	3.0	79
(iv) 2.0 …	5.8	5.2	100
(v) 2.5 …	8.5	7.7	121
(vi) 3.0 …	12	11	143
(vii) 3.5 …	15	15	163
(viii) 4.0 …	22	22	186

Source

The provisions of this Appendix A adopted December 24, 2009, effective December 26, 2009, 39 Pa.B. 7279.