Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) For the purposes of this article,
detection shall be defined by the detection limits for purposes of reporting
(DLRs) in table 64445.1-A:
Table 64445.1-A
Detection Limits for Purposes of Reporting (DLRs) for
Regulated Organic Chemicals
|
Chemical
|
Detection Limit for Purposes of
Reporting (DLR) (mg/L)
|
| |
| (a) All VOCs, except as listed
...................................... |
0.0005 |
|
Methyl-tert-butyl ether
...................................... |
0.003 |
|
Trichlorofluoromethane
...................................... |
0.005 |
|
1,1,2-Trichloro-1,2,2-Trifluoroethane
...................................... |
0.01 |
| (b)
SOCs...................................... | |
|
Alachlor...................................... |
0.001 |
|
Atrazine...................................... |
0.0005 |
|
Bentazon...................................... |
0.002 |
|
Benzo(a)pyrene......................................
|
0.0001 |
|
Carbofuran...................................... |
0.005 |
|
Chlordane...................................... |
0.0001 |
|
2,4-D...................................... |
0.01 |
|
Dalapon...................................... |
0.01 |
|
Dibromochloropropane
(DBCP)...................................... |
0.00001 |
|
Di(2-ethylhexyl)adipate......................................
|
0.005 |
|
Di(2-ethylhexyl)phthalate......................................
|
0.003 |
|
Dinoseb...................................... |
0.002 |
|
Diquat...................................... |
0.004 |
|
Endothall...................................... |
0.045 |
|
Endrin...................................... |
0.0001 |
|
Ethylene dibromide
(EDB)...................................... |
0.00002 |
|
Glyphosate...................................... |
0.025 |
|
Heptachlor...................................... |
0.00001 |
|
Heptachlor
epoxide...................................... |
0.00001 |
|
Hexachlorobenzene......................................
|
0.0005 |
|
Hexachlorocyclopentadiene......................................
|
0.001 |
|
Lindane...................................... |
0.0002 |
|
Methoxychlor......................................
|
0.01 |
|
Molinate...................................... |
0.002 |
|
Oxamyl...................................... |
0.02 |
|
Pentachlorophenol......................................
|
0.0002 |
|
Picloram...................................... |
0.001 |
|
Polychlorinated biphenyls
(PCBs)...................................... |
|
|
(as
decachlorobiphenyl)...................................... |
0.0005 |
|
Simazine...................................... |
0.001 |
|
Thiobencarb...................................... |
0.001 |
|
Toxaphene...................................... |
0.001 |
|
1,2,3-Trichloropropane......................................
|
0.000005 |
|
2,3,7,8-TCDD
(Dioxin)...................................... |
5x10-9 |
|
2,4,5-TP (Silvex)......................................
|
0.001 |
(b)
When organic chemicals are not detected pursuant to table 64445.1-A.
(1) A water system, which has not detected
any of the VOCs on table 64444-A during the initial four quarters of
monitoring, shall collect and analyze one sample annually. After a minimum of
three years of annual sampling with no detection of a VOC in table 64444-A, a
system using groundwater may reduce the monitoring frequency to one sample
during each compliance period. A system using surface water shall continue
monitoring annually.
(2) A system
serving more than 3,300 persons which has not detected an SOC on table 64444-A
during the initial four quarters of monitoring shall collect a minimum of two
quarterly samples for that SOC in one year during the year designated by the
State Board of each subsequent compliance period. The year will be designated
on the basis of historical monitoring frequency and laboratory
capacity.
(3) A system serving
3,300 persons or less which has not detected an SOC on table 64444-A during the
initial four quarters of monitoring shall collect a minimum of one sample for
that SOC during the year designated by the State Board of each subsequent
compliance period. The year will be designated on the basis of historical
monitoring frequency and laboratory capacity.
(c) When organic chemicals are detected
pursuant to table 64445.1-A.
(1) Prior to
proceeding with the requirements of paragraphs (2) through (7), the water
supplier may first confirm the analytical result, as follows: Within seven days
from the notification of an initial finding from a laboratory reporting the
presence of one or more organic chemicals in a water sample, the water supplier
shall collect one or two additional sample(s) to confirm the initial finding.
Confirmation of the initial finding shall be shown by the presence of the
organic chemical in either the first or second additional sample, and the
detected level of the contaminant for compliance purposes shall be the average
of the initial and confirmation sample(s). The initial finding shall be
disregarded if two additional samples do not show the presence of the organic
chemical.
(2) If one or both of the
related organic chemicals heptachlor and heptachlor epoxide are detected,
subsequent monitoring shall analyze for both chemicals until there has been no
detection of either chemical for one compliance period.
(3) A groundwater sampling site at which one
or more of the following chemicals has been detected shall be monitored
quarterly for vinyl chloride: trichloroethylene, tetrachloroethylene,
1,2-dichloroethane, 1,1,1-trichloroethane, cis-1,2-dichloroethylene,
trans-1,2-dichloroethylene, or 1,1-dichloroethylene. If vinyl chloride is not
detected in the first quarterly sample, the sampling site shall be monitored
once for vinyl chloride during each compliance period.
(4) If the detected level of organic
chemicals for any sampling site does not exceed any shown in table 64444-A, the
water source shall be resampled every three months and the samples analyzed for
the detected chemicals. After one year of sampling an approved surface water
system or two quarters of sampling a groundwater system, the State Board will
consider allowing the water supplier to reduce the sampling to once per year
upon request, based on a review of previous sampling data. Systems shall
monitor during the quarter(s) which previously yielded the highest analytical
results.
(5) If the detected level
of an organic chemical for any sampling site exceeds that listed in table
64444-A, the water supplier shall report this information to the State Board
within 48 hours of receipt of the result. Unless use of the contaminated source
is discontinued, the water supplier shall resample the contaminated source and
compliance shall be determined as follows:
(A) Water systems serving more than 3,300
persons shall sample monthly for six months and shall submit the results to the
State Board as specified in section
64469. If the average
concentration of the initial finding, confirmation sample(s), and six
subsequent monthly samples does not exceed the MCL shown in table 64444-A, the
water supplier may reduce the sampling frequency to once every three months. If
the running annual average or the average concentration of the initial finding,
confirmation sample(s), and six subsequent monthly samples exceeds the MCL
shown in table 64444-A, the water system shall be deemed to be in violation of
section 64444.
(B) Water systems serving 3,300 persons or
less shall sample quarterly for a minimum of one year and shall submit the
results to the State Board as specified in section
64469. If the running annual
average concentration does not exceed the MCL in table 64444-A, the water
supplier may reduce the sampling frequency to once every year during the
quarter that previously yielded the highest analytical result. Quarterly
monitoring shall resume if any reduced frequency sample result exceeds the MCL.
If the running annual average concentration exceeds the MCL in table 64444-A,
the water system shall be deemed to be in violation of section
64444.
(C) If any sample would cause the running
annual average to exceed the MCL, the water system is immediately in violation.
If a system takes more than one sample in a quarter, the average of all the
results for that quarter shall be used when calculating the running annual
average. If a system fails to complete four consecutive quarters of monitoring,
the running annual average shall be based on an average of the available
data.
(6) If any
resample, other than those taken in accordance with paragraph (5), of a water
sampling site shows that the concentration of any organic chemical exceeds a
MCL shown in table 64444-A, the water supplier shall proceed in accordance with
paragraphs (1) and (4), or paragraph (5).
(7) If an organic chemical is detected and
the concentration exceeds ten times the MCL, the water supplier shall notify
the State Board within 48 hours of the receipt of the results and the
contaminated site shall be resampled within 48 hours to confirm the result. The
water supplier shall notify the State Board of the result of the confirmation
sample(s) within 24 hours of the receipt of the confirmation result(s).
(A) If the average concentration of the
original and confirmation sample(s) is less than or equal to ten times the MCL,
the water supplier shall proceed in accordance with paragraph (5).
(B) If the average concentration of the
original and confirmation samples exceeds ten times the MCL, use of the
contaminated water source shall immediately be discontinued, if directed by the
State Board. Such a water source shall not be returned to service without
written approval from the State Board.
1. New
section filed 11-22-88; operative 12-22-88 (Register 88, No. 51).
2.
Amendment of section heading, text and NOTE filed 9-8-94 as an emergency;
operative 9-8-94 (Register 94, No. 36). A Certificate of Compliance must be
transmitted to OAL by 1-6-95 or emergency language will be repealed by
operation of law on the following day.
3. Amendment of section
heading, text and NOTE refiled 1-3-95 as an emergency; operative 1-3-95
(Register 95, No. 1). A Certificate of Compliance must be transmitted to OAL by
5-3-95 or emergency language will be repealed by operation of law on the
following day.
4. Amendment of section heading, text and NOTE
refiled 4-26-95 as an emergency; operative 4-26-95 (Register 95, No. 17). A
Certificate of Compliance must be transmitted to OAL by 8-24-95 or emergency
language will be repealed by operation of law on the following
day.
5. Certificate of Compliance as to 4-26-95 order including
amendment of subsections (b)(1)-(b)(3), (c)(1)-(2), and (c)(4)-(c)(5)(B)
transmitted to OAL 5-5-95 and filed 6-19-95 (Register 95, No.
25).
6. Amendment of subsection (a) of Table and amendment of NOTE
filed 4-17-2000; operative 5-17-2000 (Register 2000, No. 16).
7.
Amendment of Table 64445.1-A and amendment of NOTE filed 5-13-2003; operative
6-12-2003 (Register 2003, No. 20).
8. Amendment of subsections
(c)(5)-(c)(5)(B), new subsection (c)(5)(C), amendment of subsections
(c)(7)(A)-(B) and amendment of NOTE filed 10-29-2008; operative 11-28-2008
(Register 2008, No. 44).
9. Change without regulatory effect
amending subsections (a)(2)-(3), (c)(4)-(c)(5)(B), (c)(7) and (c)(7)(B) and
amending NOTE filed 6-2-2015 pursuant to section
100, title 1, California Code of
Regulations (Register 2015, No. 23).
10. Amendment filed 12-14-2017;
operative 12-14-2017 pursuant to Government Code section
11343.4(b)(3)
(Register 2017, No. 50).
Note: Authority cited: Sections
116271,
116350
and
116375,
Health and Safety Code. Reference: Sections
116385,
116450,
116460
and
116555,
Health and Safety Code.
