COGCC

Cleanup Concentrations

Table 915

Contaminant of Concern	Concentrations
Soil TPH (total volatile [C₆-C₁₀] and extractable [C₁₀-C₃₆] hydrocarbons)	500mg/kg
Soils and Groundwater - liquid hydrocarbons including condensate and oil.	below visual detection limits
Soil Suitability for Reclamation
Electrical conductivity (EC) (by saturated paste method)¹ ²	<mmhos/cm
Sodium absorption ratio (SAR) (by saturated paste method)¹ ² ³	<6
pH (by saturated paste method)¹ ²	2mg/l
Organic Compounds in Groundwater ⁴
Benzne	5μg/l
Toluene⁵	560 to 1,000μg/l
ethylbenzene	700μg/l
xylenes (sum of o-, m-, and p- isomers = total xyelenes)⁵	1,400 to 10,000μg/l
naphthalene	140μg/l
1,2,4-trimethylbenzene	67μg/l
1,3,5-trimethylbenzene	67μg/l
Groundwater Inorganic Parameters⁴
Total dissolved solids (TDS)¹	<1.25 X local background
Chloride ion¹	250mg/l or <1.25 X local background
Sulfate ion¹	250mg/l or <1.25 X local background

Table 915 (Continued)

Contaminant of Concern	Concentrations
	Residential Soil Screening Level Concentrations (mg/kg)	Protection of Groundwater Soil Screening Level Concentrations (mg/kg) Risk Based (M) and MCL Based (M)
Organic Compounds in Soils⁶ ⁹ ¹⁰
benzene	1.2	0.0026 (M)
toluene	490	0.69 (M)
ethylbenzene	5.8	0.78 (M)
xylenes (sum of o-, m- and p- isomers = total xylenes)	58	9.9 (M)
1,2,4-trimethylbenzene	30	0.0081 (R)
1,3,5-trimethylbenzene	27	0.0087 (R)
acenaphthene	360	0.55 (R)
anthracene	1800	5.8 (R)
benz(a)anthracene	1.1	0.011 (R)
benzo(b)fluoranthene	1.1	0.3 (R)
benzo(k)fluoranthene	11	2.9 (R)
benzo(a)pyrene	0.11	0.24 (M)
chrysene	110	9 (R)
dibenzo(a,h)anthracene	0.11	0.096 (R)
fluoranthene	240	8.9 (R)
fluorene	240	0.54 (R)
indeno(1,2,3-cd)pyrene	1.1	0.98 (R)
1-methylnaphthalene	18	0.006 (R)
2-methylnaphthalene	24	0.019 (R)
naphthalene	2	0.0038 (R)
pyrene	180	1.3 (R)
Metals in Soils¹ ⁶ ⁹ ¹⁰ ¹¹
arsenic	0.68	0.29 (M)
barium	15000	82 (M)
cadmium	71	0.38 (M)
chromium (VI)	0.3	0.00067 (R)
copper	3100	46 (M)
lead	400	14 (M)
nickel	1500	26 (R)
selenium	390	0.26 (M)
silver	390	0.8 (R)
zinc	23000	370 (R)

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