Schedule 2020
Description: NAWQA 85 VOCs, WWR, +IDs, Note: GW=3x40ml, SW=4x40ml, Acid
Analyzing Laboratory(s):
USGS - National Water Quality Laboratory, Denver, CO
Analyte CAS Number RL Unit
1,2,3,4-Tetramethylbenzene  488-23-3 0.14 ug/L
1,2,3,5-Tetramethylbenzene  527-53-7 0.14 ug/L
2-Butanone  78-93-3 2 ug/L
trans-1,4-Dichloro-2-butene  110-57-6 0.7 ug/L
2-Hexanone  591-78-6 0.4 ug/L
4-Methyl-2-pentanone  108-10-1 0.37 ug/L
Acetone  67-64-1 6 ug/L
Acrylonitrile  107-13-1 0.8 ug/L
Benzene  71-43-2 0.021 ug/L
1,2,3-Trichlorobenzene  87-61-6 0.18 ug/L
1,2,3-Trimethylbenzene  526-73-8 0.06 ug/L
1,2,4-Trichlorobenzene  120-82-1 0.12 ug/L
1,4-Bromofluorobenzene  460-00-4 pct
Bromobenzene  108-86-1 0.028 ug/L
Chlorobenzene  108-90-7 0.028 ug/L
Ethylbenzene  100-41-4 0.03 ug/L
1,3-Dichlorobenzene  541-73-1 0.03 ug/L
Butylbenzene  104-51-8 0.12 ug/L
n-Propylbenzene  103-65-1 0.042 ug/L
1,2-Dichlorobenzene  95-50-1 0.048 ug/L
1,4-Dichlorobenzene  106-46-7 0.034 ug/L
sec-Butylbenzene  135-98-8 0.06 ug/L
tert-Butylbenzene  98-06-6 0.06 ug/L
Bromoethene  593-60-2 0.1 ug/L
Bromoform  75-25-2 0.1 ug/L
Hexachlorobutadiene  87-68-3 0.14 ug/L
Carbon disulfide  75-15-0 0.038 ug/L
Tetrachloromethane  56-23-5 0.06 ug/L
Chloroform  67-66-3 0.024 ug/L
Isopropylbenzene  98-82-8 0.038 ug/L
1,1,1,2-Tetrachloroethane  630-20-6 0.03 ug/L
1,1,1-Trichloroethane  71-55-6 0.032 ug/L
1,1,2-Trichlorotrifluoroethane  76-13-1 0.038 ug/L
1,2-Dibromoethane  106-93-4 0.036 ug/L
1,2-Dichloroethane-d4  17060-07-0 pct
1,2-Dichloroethane  107-06-2 0.13 ug/L
Hexachloroethane  67-72-1 0.14 ug/L
1,1,2,2-Tetrachloroethane  79-34-5 0.08 ug/L
Chloroethane  75-00-3 0.12 ug/L
Diethyl ether  60-29-7 0.08 ug/L
Ethyl tert-butyl ether  637-92-3 0.03 ug/L
cis-1,2-Dichloroethylene  156-59-2 0.024 ug/L
Tetrachloroethylene  127-18-4 0.03 ug/L
trans-1,2-Dichloroethylene  156-60-5 0.032 ug/L
Trichloroethylene  79-01-6 0.038 ug/L
1,1-Dichloroethane  75-34-3 0.035 ug/L
Tetrahydrofuran  109-99-9 1 ug/L
Diisopropyl ether  108-20-3 0.1 ug/L
m- and p-Xylene  m=108-38-3p=106-42-3 0.06 ug/L
1,3,5-Trimethylbenzene  108-67-8 0.044 ug/L
Ethyl methacrylate  97-63-2 0.18 ug/L
Methyl methacrylate  80-62-6 0.2 ug/L
Methyl acrylonitrile  126-98-7 0.4 ug/L
Bromochloromethane  74-97-5 0.12 ug/L
Bromodichloromethane  75-27-4 0.028 ug/L
Dibromochloromethane  124-48-1 0.1 ug/L
Dichlorodifluoromethane  75-71-8 0.18 ug/L
Trichlorofluoromethane  75-69-4 0.08 ug/L
Methyl acrylate  96-33-3 1 ug/L
Bromomethane  74-83-9 0.26 ug/L
Chloromethane  74-87-3 0.17 ug/L
Methyl iodide  74-88-4 0.5 ug/L
tert-Butyl methyl ether  1634-04-4 0.1 ug/L
Dibromomethane  74-95-3 0.05 ug/L
Dichloromethane  75-09-2 0.06 ug/L
Naphthalene  91-20-3 0.52 ug/L
Number of Tentatively Identified Compounds (TICs)  no.
o-Xylene  95-47-6 0.038 ug/L
4-Isopropyl-1-methylbenzene  99-87-6 0.08 ug/L
1,2,3-Trichloropropane  96-18-4 0.18 ug/L
1,3-Dichloropropane  142-28-9 0.06 ug/L
2,2-Dichloropropane  594-20-7 0.05 ug/L
1,2-Dibromo-3-chloropropane  96-12-8 0.51 ug/L
1,1-Dichloropropene  563-58-6 0.026 ug/L
3-Chloropropene  107-05-1 0.5 ug/L
cis-1,3-Dichloropropene  10061-01-5 0.05 ug/L
trans-1,3-Dichloropropene  10061-02-6 0.09 ug/L
1,2-Dichloropropane  78-87-5 0.029 ug/L
1,2,4-Trimethylbenzene  95-63-6 0.056 ug/L
Set number  no.
Styrene  100-42-5 0.042 ug/L
tert-Pentyl methyl ether  994-05-8 0.04 ug/L
Toluene  108-88-3 0.02 ug/L
2-Chlorotoluene  95-49-8 0.04 ug/L
o-Ethyl toluene  611-14-3 0.06 ug/L
4-Chlorotoluene  106-43-4 0.05 ug/L
Toluene-d8  2037-26-5 pct
Vinyl chloride  75-01-4 0.08 ug/L
1,1,2-Trichloroethane  79-00-5 0.04 ug/L
1,1-Dichloroethylene  75-35-4 0.024 ug/L
Container Requirements
Quantity     Bottle
3 40mL GCV - This schedule consumes the entire container.
Description: 40 mL Glass septum vial, amber
Treatment and Preservation: DO NOT RINSE VIAL. Completely fill vial with sample to exclude air bubbles. Preserve all volatiles samples except samples for Schedules1306 and 4024 adjusting sample with 1:1 HCl/H2O solution to a pH of 2. If free chlorine is present, first add 25 mg of ascorbic acid to each vial before filling with sample, then fill with sample and adjust the sample to a pH of 2. Protect sample from sunlight, store sample at 4 deg C, ship immediat
References
1. OFR 97-829 
Brooke F. Connor, Donna L. Rose, Mary C. Noriega, Lucinda Murtagh and Sonja R. Abney
Method ID: O-4127-96
2. NWQL Tech Memo 98-06 
Elimination of Acrolein from NWQL Schedules 2020, 2021 and Deletion of Schedule 1401
Method ID: TM 98-06