Table 4. The predicted and actual values for TPH and THC loss as determined by RSM.

		21 Days Cocktail Treatment				56 Days Cocktail Treatment
		TPH Removal (%)		THC Removal (%)		TPH Removal (%)		THC Removal (%)
Standard Order	Run Order	Actual Value	Predicted Value	Actual Value	Predicted Value	Actual Value	Predicted Value	Actual Value	Predicted Value
5	1	66.96	68.13	62.02	64.17	85.15	85.2	86.16	87.93
6	2	78.24	78.61	80.95	80.65	93.96	93.19	92.41	91.5
11	3	76.64	75.42	80	77.93	92.36	92.64	85.46	86.38
12	4	80.48	83.23	85.49	89.41	93.32	92.33	94.08	94.01
1	5	67.48	69.07	66.1	67.87	87.21	86.17	87.72	85.88
8	6	79.97	78.8	84.05	81.9	94.81	94.75	94.93	93.17
2	7	76.38	78.76	77.22	81.44	92.89	92.66	92.69	93.54
3	8	82.03	79.65	87.07	82.84	85.75	85.97	95.61	94.76
10	9	70.12	71.34	69.27	71.34	88.99	88.71	89.49	88.57
7	10	83.96	83.59	88.33	88.63	89.66	90.42	89.62	90.53
4	11	77.24	75.66	80.79	79.02	90.77	91.8	91.47	93.31
13	12	89.64	89.64	88.97	88.97	96.28	96.28	96.69	96.69
14	13	89.64	89.64	88.97	88.97	96.28	96.28	96.69	96.69
9	14	74.41	71.66	74.2	70.28	88.48	89.47	87.48	87.55
15	15	89.64	89.64	88.97	88.97	96.28	96.28	96.69	96.69

THC = Total Hydrocarbon Content; TPH = Total Petroleum Hydrocarbon