§259.APPENDIX D. Groundwater Cleanup Objectives (GWobj)

Name		CAS No.a		Recommended Test  Methodb		Subsurface (mg/L)c		Surface (mg/L)d
acetochlor		34256-82-1		505		0.002j		0.01g
acifluorfen sodium		62476-59-9		515.1		0.091f		0.455g
alachlor		15972-60-8		505		0.002		0.01
aldicarb		116-06-3		531.1		0.003		0.015
aldrin		309-00-2		508		0.000005e		0.000025e
ammonia		7664-41-7		350.2		10.0o		50.0o
atrazine		1912-24-9		505		0.003		0.015
bentazon sodium		50723-80-3		515.1		0.21f		1.05g
bromacil		314-40-9		507		0.7f		3.5g
bromoxynil(o)		1689-99-2				0.14f		0.7g
butylate		2008-41-5		507		0.35f		1.75g
carbofuran		1563-66-2		531.1		0.04		0.2
chlordane		57-74-9		508		0.002		0.01
chlorimuron-ethyl		90982-32-4				0.14f		0.7g
chlorpyrifos		2921-88-2		525.2		0.021f		0.105g
cyanazine		21725-46-2		508.1		0.014l		0.07g
2,4-D		94-75-7		515.1		0.07		0.35
4,4'-DDD		72-54-8		508		0.0004e		0.002e
4,4'-DDE		72-55-9		508		0.0003e		0.0015e
4,4'-DDT		50-29-3		508		0.0003e		0.0015e
diazinon		333-41-5		507		0.00063l		0.00315g
dicamba		1918-00-9		515.1		0.21f		1.05g
dieldrin		60-57-1		508		0.000005e		0.000025e
dimethoate		60-51-5		8141h		0.0014f		0.007g
dinoseb		88-85-7		515.1		0.007		0.07
disulfoton		298-04-4		507		0.00028f		0.0014g
endosulfan		115-29-7		508		0.2e		1.0e
endothall		145-73-3		548.1		0.1		0.1
endrin		72-20-8		508		0.002		0.01
EPTC		759-94-4		507		0.175f		0.875g
glyphosate		1071-83-6				0.7k		3.5g
HCH-alpha		319-84-6		508		0.00001e		0.00005e
heptachlor		76-44-8		505		0.0004		0.002
heptachlor epoxide		1024-57-3		505		0.0002		0.001
lindane		58-89-9		508		0.0002		0.001
linuron		330-55-2		508		0.014f		0.07g
malathion		121-75-5				0.14f		0.7g
methoxychlor		72-43-5		508		0.04		0.2
metolachlor		51218-45-2		507		1.05f		5.25g
metribuzin		21087-64-9		507		0.175m		0.875g
nitrate, as N		7631-99-4		300.0		10.0c		100.0d
parathion, ethyl		56-38-2		8141h		0.042f		0.21g
parathion, methyl		298-00-0		8141h		0.00175f		0.00875g
pendimethalin		40487-42-1				0.28f		1.4g
permethrin		52645-53-1				0.35f		1.75g
phorate		298-02-2		8141h		0.0014i		0.007g
simazine		122-34-9		505		0.004		0.04
2,4,5-TP		93-72-1		515.1		0.05		0.25
terbufos		13071-79-9		507		0.00175i		0.00875g
toxaphene		8001-35-2		508		0.003		0.015
trifluralin		1582-09-8		508		0.0525f		0.2625g

 

Notes:

^a       Chemical Abstract Service (CAS)

^b      USEPA "Methods for the Determination of Organic Compounds in Drinking Water" Supplement III of 1995

^c       Groundwater Quality Standards for Class I: Potable Resource Groundwater (35 Ill. Adm. Code 620.410)

^d      Groundwater Quality Standards for Class II: General Resource Groundwater (35 Ill. Adm. Code 620.420)

^e       Tiered Approach to Corrective Action Objectives (TACO): Values Used to Calculate the Tier I Soil Remediation Objectives for the Migration  to Groundwater Portion of the Groundwater Ingestion Route (35 Ill. Adm. Code  742.Appendix B:Table F)

^f       Human Threshold Toxicant Advisory Concentration (HTTAC) from "Procedures for Determining Human Threshold Toxicant Advisory Concentration for Class I: Potable Resource Groundwater" (35 Ill. Adm. Code 620.Appendix A) using values from Integrated Risk Information System (IRIS), USEPA

^g      Class II GW_obj values based on Class I GW_obj values times 5

^h      USEPA "Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods (SW-846)", July 1992

ⁱ       HTTAC using values from Health Effects Assessment Summary Tables (HEAST), 1997, USEPA

^j       Value from the Acetochlor Registration Agreement monitoring program, http://www.epa.gov/oppefed1/aceto/index.htm

^k      MCL value from Drinking Water Standards and Health Advisories (Summer 2000, EPA 822-B-00-001)

^l       HTTAC using RfD value from Drinking Water Standards and Health Advisories (Summer 2000, EPA 822-B-00-001)

^m     HTTAC using RfD value from Risk Assessment Information System (RAIS), http://risk.lsd.ornl.gov/rap_hp.shtml

ⁿ      In order to provide environmentally conservative default SCOs that take into account the potential for long-term nitrification, one-third of the USEPA's Lifetime Health Advisory Level for ammonia in drinking water (30 mg/L) is used as basis for the groundwater cleanup objectives for Class I and Class II groundwater (U.S. Environmental Protection Agency, 2004, 2004 Edition of the Drinking Water Standards and Health Advisories, Office of Water, Washington, D.C., EPA 822-R-04-005).  Although the Lifetime Health Advisory Level was established for ammonia, most of the dissolved ammonia occurs as ammonium within the pH range (5.6-9.0) of Illinois groundwater.

 

(Source:  Amended at 32 Ill. Reg. 1308, effective January 21, 2008)