TABLE 3.

Enumeration of viable microorganisms in the pristine and contaminated Alpine soils^a

Soil sample	TPH (mg/kg)	No. of heterotrophs (106 CFU/g) at:				No. of hydrocarbon degraders (106 CFU/g) for:
		2°C	10°C	25°C	37°C	Hexadecane, 10°C	Diesel oil, 10°C	Diesel oil, 37°C
Pristine soils
P1	83	1	2	3	0.2	1.3	0.1	0.1
P2	41	3	2	7	0.05	0.9	0.5	0.0001
P3	74	6	30	40	0.1	20	15	0.04
P4	87	7	13	11	<0.001	7	4	<0.0001
P5	20	2	2	4	0.05	2	2	0.02
P6	89	11	31	21	0.02	13	18	0.02
P7	54	2	10	38	0.7	4	4	0.01
P8	29	2	29	93	8	6	5	1.4
Contaminated soils
C1	428	0	3	15	0.3	2	2	0.02
C2	743	1	8	10	0.04	0.9	1	0.002
C3	756	5	28	58	11	12	10	0.04
C4	1,052	32	67	144	0.3	64	47	0.03
C5	2,085	3	54	90	0.1	3	2	0.0004
C6	3,148	2	7	6	0.02	1	1	0.0004
C7	3,317	51	268	708	4	93	99	0.3
C8	8,385	24	127	70	0.03	11	11	0.01
C9	13,903	2	15	139	0.1	1	11	0.01
C10	22,288	35	70	66	4	17	15	0.4
C11	22,447	2	10	93	0.6	2	2	0.4
C12	30,644	22	62	286	0.6	32	40	0.2

^aGrowth after 28, 14, 7, and 3 to 6 days at 2, 10, 25 and 37°C, respectively. All values are expressed on a dm of soil basis.