[31 Pa.B. 6395]

[Continued from previous Web Page]

§ 250.311. Evaluation of ecological receptors.

   (a)  In addition to any protection afforded under other requirements for meeting surface water and air quality standards and MSCs under this chapter, based on the screening process in this section, direct impacts from regulated substances to the following receptors shall be assessed and addressed to implement a remedy that is protective of the environment:

   (1)  Individuals of threatened or endangered species as designated by the United States Fish and Wildlife Service under the Endangered Species Act (16 U.S.C.A. §§ 1531--1544).

   (2)  Exceptional value wetlands as defined in § 105.17 (relating to wetlands).

   (3)  Habitats of concern.

   (4)  Species of concern.

   (b)  For purposes of determining impacts on ecological receptors, no additional evaluation is required if the remediation attains a level equal to 1/10th of the value in Appendix A, Tables 3 and 4, except for constituents of potential ecological concern identified in Table 8, or if the criteria in paragraph (1), (2) or (3) are met. Information that supports a determination that no additional evaluation is required shall be documented in the final report.

   (1)  Jet fuel, gasoline, kerosene, number two fuel oil or diesel fuel are the only constituents detected onsite.

   (2)  The area of contaminated soil is less than 2 acres and the area of contaminated sediment is less than 1,000 square feet.

   (3)  The site has features, such as buildings, parking lots or graveled paved areas, which would obviously eliminate the specific exposure pathways, such as soils exposure.

   (c)  If none of the criteria in subsection (b) are met and if no Constituents of Potential Ecological Concern (CPECs) associated with the release being addressed as part of an NIR at the site, as identified in Appendix A, Table 8, are detected onsite, an onsite evaluation shall be conducted to document any indications of ecological impact. Ecological impacts requiring more detailed evaluation exist if there are differences of greater than 50% in the density or diversity of species or habitats of concern when compared with nearby reference areas representing equivalent ecological areas without contamination, if available. This evaluation shall also document the presence of threatened and endangered species and exceptional value wetlands. If no ecological impacts requiring further evaluation are identified, and no threatened and endangered species exist within a 2,500-foot radius of the site and no exceptional value wetlands exist on the site, no further evaluation is required and that determination shall be documented in the final report.

   (d)  If none of the criteria in subsection (b) are met and if CPECs associated with the release being addressed as part of an NIR at the site are detected onsite or ecological impacts requiring more detailed evaluation, threatened and endangered species, or exceptional value wetlands as identified in subsection (c) exist, a detailed onsite evaluation shall be conducted by a person qualified to perform environmental risk assessments to document any substantial ecological impacts. Substantial ecological impacts exist if there are differences of greater than 20% in the density of species of concern or greater than 50% in the diversity and extent of habitats of concern when compared with nearby reference areas representing equivalent ecological areas without contamination, if available. If there are no substantial ecological impacts identified and there are no threatened or endangered species on or within a 2,500-foot radius of the site and no exceptional value wetlands on the site, that determination shall be provided in the final report.

   (e)  If the person cannot demonstrate that they meet the criteria in subsection (b), and cannot demonstrate that the evaluation performed under subsection (c) identified no ecological impacts requiring more detailed evaluation under subsection (d), or cannot demonstrate that the evaluation performed under subsection (d) identified no substantial ecological impacts, or threatened or endangered species or exceptional value wetlands, one of the following shall be met:

   (1)  A person shall demonstrate in the final report that attainment of the Statewide health standard MSCs are protective of the ecological receptors.

   (2)  If a demonstration cannot be made that the Statewide health standard MSCs are protective of ecological receptors, a person shall demonstrate in the final report that postremedy use will eliminate complete exposure pathways at the time of the final report or in accordance with a postremediation care plan, or that mitigative measures identified in subsection (f) have been instituted and are subject to postremediation care plan requirements as described in § 250.312(b) (relating to final report).

   (3)  A person shall demonstrate attainment of the background standard.

   (4)  A person shall follow the procedures in §§ 250.402(c) and 250.409 (relating to human health and environmental protection goals; and risk assessment report) and demonstrate attainment of the site-specific standard for protection of ecological receptors.

   (f)  Mitigation measures to restore or replace equivalent ecological resources in the local area of the site may be applied if the following are met:

   (1)  No exceptional value wetlands have been identified by the screening process.

   (2)  No Federal or State laws and regulations prohibit or restrict the elimination of habitats or species identified by the screening process.

   (3)  A mitigation measure is selected based on the following hierarchy:

   (i)  Restoration onsite of species and habitats identified in the screening process.

   (ii)  Replacement onsite of species and habitats identified in the screening process.

   (iii)  Replacement on an adjacent area to the site of species and habitats identified in the screening process.

   (iv)  Replacement at a location within the municipality where the site is located of species and habitats identified in the screening process.

   (4)  The Department will review and approve mitigation measures prior to implementation to ensure that the proposed remedy and intended use of the property minimize the impacts to ecological receptors identified in the screening procedure.

   (5)  The postremediation care plan requirements in § 250.312(e) or § 250.411(f) (relating to final report) are implemented.

Subchapter G. DEMONSTRATION OF ATTAINMENT

§ 250.703. General attainment requirements for soil.

   (a)  For any standard selected, the attainment demonstration for the soil media shall be made at the point of compliance as defined in Subchapters B--D (relating to background standards; Statewide health standards; and site-specific standards)

   (b)  The soil to which the attainment criteria are applied shall be determined by circumscribing with an irregular surface those concentrations detected during characterization which exceed the selected standard. Where this soil is to be removed from the site, the attainment demonstration applies to the base of the excavation defined by the limit of excavation.

   (c)  Sampling points for demonstration of attainment of soils shall be selected to be random and representative both horizontally and vertically based on a systematic random sampling as set forth in a Department approved reference. If exceedances of a standard occur in a localized area, the Department may require additional characterization and remediation if three or more adjacent samples exceed the standard by more than ten times.

   (d)  For statistical methods under § 250.707(b)(1)(i) (relating to statistical tests), the number of sample points required for each distinct area of contamination to demonstrate attainment shall be determined in the following way:

   (1)  For soil volumes equal to or less than 125 cubic yards, at least eight samples.

   (2)  For soil volumes up to 3,000 cubic yards, at least 12 sample points.

   (3)  For each additional soil volume of up to 3,000 cubic yards, an additional 12 sample points.

   (4)  Additional sampling points may be required based on site-specific conditions.

   (e)  For statistical methods under § 250.707(b)(1)(ii) and (c), the minimum number of samples required for demonstrating attainment shall be as specified by the documentation of the chosen method.

§ 250.707. Statistical tests.

   (a)  For regulated substances which are naturally occurring, the person shall compare the analytical results of background reference samples, that are representative of naturally occurring concentrations of regulated substances on the site, with the analytical results of the medium of concern onsite. For nonnaturally occurring regulated substances for which a known background condition exists, the person shall compare the analytical results of background reference samples, which are related to the migration of contaminants onto the site, with the analytical results of the medium of concern onsite. In addition, application of statistical tests for the background standard shall be as follows:

   (1)  Soil. For soil, a person shall use one of the following statistical methods in subparagraphs (i)--(iii) and conditions relating to subparagraphs (i)--(iii) as described in subparagraphs (iv)--(vi) to demonstrate attainment of the background standard:

   (i)  The person shall demonstrate that the highest measurement from the area of concern is not greater than the highest measurement from the background area. The Department may accept insignificant variances in numbers. The minimum number of samples to be collected is ten from the background reference population and ten from each distinct area of contamination.

   (ii)  The Department may accept the use of a combination of the Wilcoxon rank-sum test (equivalent to the Mann-Whitney U test) and the quantile test for data from two populations. The application of these tests shall meet the criteria in subparagraphs (iv) and (vi).

   (iii)  The Department may accept other appropriate statistical methods that meet the requirements of subparagraphs (iv)--(vi).

   (iv)  For nonparametric and parametric methods under subparagraphs (ii) and (iii), the false-positive rate for a set of data applied to a statistical test may not be greater than 0.20. The minimum number of samples to be collected is ten from the background population and ten from each distinct area of contamination.

   (v)  For parametric methods under subparagraph (iii), the censoring level for each nondetect (ND) shall be the assigned value randomly generated that is between zero and the limit related to the PQL.

   (vi)  For nonparametric and parametric methods under subparagraphs (ii) and (iii), the application of a statistical method shall meet the criteria in subsection (d).

   (2)  Groundwater for known upgradient release of a regulated substance.

   (i)  The Department may accept the use of the nonparametric tolerance intervals that are applied in accordance with the procedures in subparagraphs (ii)--(vi) and (viii)--(x).

   (ii)  The upgradient concentration shall be determined by sampling in a background reference well shown on the basis of characterization to exhibit the highest concentration and by demonstrating that the groundwater is representative of concentrations in groundwater that are migrating onto the site.

   (iii)  The background reference well shall be sampled over a period of eight quarters to provide eight samples.

   (iv)  From these eight samples, the highest concentration for each regulated substance shall be selected as the upper tolerance limit.

   (v)  In each onsite well, eight samples shall also be collected during the same eight-quarter period.

   (vi)  The upper tolerance limit shall be met in each onsite well. The maximum of data collected from each onsite well shall be at or below the upper tolerance limit.

   (vii)  In lieu of subparagraphs (iv)--(vi), the Department may accept a retesting strategy using nonparametric prediction limit in accordance with current EPA guidance (EPA, Office of Solid Waste Management Division. ''Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities;'' Addendum to Interim Final Guidance, EPA, Washington, D. C. June 1992). For each regulated substance, the highest concentration of the eight background reference samples shall be selected as the upper prediction limit, as determined by the most current EPA guidance.

   (viii)  The application of a statistical method for groundwater background standard shall meet the criteria in subsection (d).

   (ix)  For parametric methods, the censoring level for each nondetect (ND) shall be the assigned value randomly generated that is between zero and the limit related to the PQL.

   (x)  In lieu of eight-quarter sampling in subparagraphs (iii) and (v), the Department may allow the eight samples to be taken during a period of four quarters, or less with written approval from the Department if the following criteria can be met:

   (A)  There is adequate spatial monitoring of the plume upgradient of the property on which the release occurred which indicates a stable plume condition.

   (B)  Parameters affecting the fate and transport of regulated substances within the plume have been fully evaluated.

   (C)  Coefficient of variation for the eight samples collected over a 4-quarter period may not exceed 1.0 for metals and 2.0 for organic compounds.

   (D)  The age of the plume is sufficiently well known to permit a judgment to be made regarding its stability and remediation of the source associated with the upgradient contamination is not currently or has not recently occurred.

   (3)  Background groundwater conditions due to naturally occurring or areawide contamination.

   (i)  To use this subparagraph for areawide contamination, the person performing remediation shall demonstrate to the Department, in writing, that the site conditions are due to areawide contamination and shall obtain the Department's approval to use this subsection.

   (ii)  A minimum of 12 samples shall be collected from any combination of monitoring wells, including upgradient locations, if all data collected is used in determination of background concentrations.

   (iii)  The same number of samples shall be collected within and representative of the area of groundwater contamination (plume) onsite as were collected in the upgradient sampling for each sampling event.

   (iv)  The samples from the upgradient wells and the wells in the plume onsite shall be collected during the same sampling event.

   (v)  Sampling may be accelerated so that all sampling events occur in as short a period of time as possible so as not to result in serial correlation in the data.

   (vi)  The resulting values may be used with appropriate nonparametric or parametric methods to compare the two populations.

   (vii)  The sampling results in the plume onsite may not exceed the sum of the background arithmetic average and three times the standard deviation calculated for the background area.

   (viii)  The application of a statistical method for groundwater background standard shall meet the criteria in subsection (d).

   (ix)  For parametric methods, the censoring level for each nondetect (ND) shall be the assigned value randomly generated that is between zero and the limit related to the PQL.

   (b)  The following statistical tests may be accepted by the Department to demonstrate attainment of the Statewide health standard. The statistical test for soil shall apply to each distinct area of contamination. The statistical test for groundwater will apply to each compliance monitoring well. Testing shall be performed individually for each regulated substance identified in the final report site investigation as being present at the site for which a person wants relief from liability under the act. The application of a statistical method shall meet the criteria in subsection (d).

   (1)  For soil attainment determination at each distinct area of contamination, subparagraph (i), (ii) or (iii) shall be met in addition to the attainment requirements in §§ 250.702 and 250.703 (relating to attainment requirements; and general attainment requirements for soil).

   (i)  Seventy-five percent of all samples, which shall be randomly collected in a single event from the site, shall be equal to or less than the Statewide health standard or the limit related to PQLs with no individual sample exceeding ten times the Statewide health standard.

   (ii)  As applied in accordance with EPA approved methods on statistical analysis of environmental data, as identified in subsection (e), the 95% UCL of the arithmetic mean shall be at or below the Statewide health standard.

   (iii)  For sites with a petroleum release where full site characterization, as defined in § 250.204(b) (relating to final report), has not been done in association with an excavation remediation, attainment of the Statewide health standard shall be demonstrated using the following procedure:

   (A)  For sites regulated under Chapter 245 (relating to administration of the storage tank and spill prevention program) where there is localized contamination as defined in the document ''Closure Requirements for Underground Storage Tank Systems'' (DEP technical document 2530-BK-DEP2008), samples shall be taken in accordance with that document.

   (B)  For sites not covered by clause (A), including all sites being remediated under an NIR under this chapter, samples shall be taken from the bottom and sidewalls of the excavation in a biased fashion that concentrates on areas where any remaining contamination above the Statewide health standard would most likely be found. The samples shall be taken from these suspect areas based on visual observation and the use of field instruments. If a sufficient number of samples has been collected from all suspect locations and the minimum number of samples has not been collected, or if there are no suspect areas, the locations to meet the minimum number of samples shall be based on a random procedure. The number of sample points required shall be determined in the following way:

   (I)  For 250 cubic yards or less of excavated contaminated soil, five samples shall be collected.

   (II)  For each additional 100 cubic yards of excavated contaminated soil, one sample shall be collected.

   (III)  For excavations involving more than 1,000 cubic yards of contaminated soil, the remediator shall identify the number and locations of samples in a confirmatory sampling plan submitted to the Department. The remediator shall obtain the Department's approval of the confirmatory sampling plan prior to conducting attainment sampling.

   (IV)  Where water is encountered in the excavation and obvious contamination is observed or indicated, soil samples collected just above the soil/water interface shall be equal to or less than the applicable Statewide health MSC determined by § 250.308(a)(2)(ii) (relating to soil to groundwater pathway numeric values).

   (V)  Where water is encountered in the excavation and no obvious contamination is observed or indicated, a minimum of two samples shall be collected from the water surface in the excavation.

   (C)  All sample results shall be equal to or less than the applicable Statewide health MSC as determined using Tables 1--4 and 6 in Appendix A.

   (iv)  For sites where there is a release to surface soils resulting in excavation of 50 cubic yards or less of contaminated soil, samples shall be collected as described in subparagraph (iii)(B), except that two samples shall be collected.

   (2)  For groundwater attainment determination at each compliance monitoring well, subparagraph (i) or (ii) shall be met in addition to the attainment requirements in § 250.702 and § 250.704 (relating to general attainment requirements for groundwater).

   (i)  Seventy-five percent of all samples collected within each monitoring well over time shall be equal to or less than the Statewide health standard or the limit related to PQLs with no individual sample exceeding both of the following:

   (A)  Ten times the Statewide health standard on the property.

   (B)  Two times the Statewide health standard beyond the property boundary.

   (ii)  As applied in accordance with EPA approved methods on statistical analysis of environmental data, as identified in subsection (e), the 95% UCL level of the arithmetic mean shall be at or below the Statewide health standard.

   (3)  In addition to the statistical tests identified in paragraphs (1) and (2), a person may use a statistical test that meets the requirements of subsection (d) to demonstrate attainment.

   (c)  To demonstrate attainment of the site-specific standard, a person may use a statistical test identified in subsection (b)(1)(ii) and (2)(ii) where the 95% UCL of the arithmetic mean is below the site-specific standard or a statistical test that meets the requirements of subsection (d). The attainment test and the methodology used in the risk assessment to evaluate exposure concentrations shall be the same.

   (d)  Except for the statistical methods identified in subsections (a)(1)(i) and (b)(1)(i) and (2)(i), a demonstration of attainment of one or a combination of remediation standards shall comply with the following:

   (1)  When statistical methods are to be used for demonstration of attainment of Statewide health or site-specific standards, the null hypotheses (Ho) shall be that the true site arithmetic average concentration is at or above the cleanup standard, and the alternative hypothesis (Ha) shall be that the true site arithmetic average concentration is below the cleanup standard. When statistical methods are to be used to determine that the background standard is exceeded, the null hypothesis (Ho) shall be that the background standard is achieved and the alternative hypothesis (Ha) shall be that the background standard is not achieved.

   (2)  A statistical method chosen shall comply with the following performance standards:

   (i)  The underlying assumptions of the statistical method shall be met, such as data distribution.

   (ii)  The statistical method shall be recommended for this use in Department-approved guidance or regulation and shall be generally recognized as appropriate for the particular remediation implemented at the site.

   (iii)  Compositing cannot be used with nonparametric methods or for volatile organic compounds.

   (iv)  For parametric methods, the censoring level for each nondetect shall be the assigned value randomly generated that is between zero and the limit related to the PQL.

   (v)  Tests shall account for seasonal and spatial variability as well as temporal correlation of data, unless otherwise approved by the Department.

   (vi)  Tests used to determine that the background standard is exceeded shall maintain adequate power to detect contamination in accordance with current EPA guidances, regulations or protocols.

   (vii)  For the limits relating to the PQLs, Statewide health and site-specific standards, the false-positive rate for a statistical test may not be greater than 0.20 for nonresidential and 0.05 for residential.

   (viii)  Statistical testing shall be done individually for each regulated substance present at the site.

   (3)  The following information shall be documented in a final report when a statistical method is applied:

   (i)  A description of the statistical method.

   (ii)  A clear statement of the applicable decision rule in the form of statistical hypotheses for each spatial unit and temporal boundary including the applicable statistical parameter of interest and the specific cleanup standard.

   (iii)  A description of the underlying assumptions of the method.

   (iv)  Documentation showing that the sample data set meets the underlying assumptions of the method and demonstrating that the method is appropriate to apply to the data.

   (v)  Specification of false positive rates and, in addition for the background standard, specification of false negative rates.

   (vi)  Documentation of input and output data for the statistical test, presented in tables or figures, or both, as appropriate.

   (vii)  An interpretation and conclusion of the statistical test.

   (e)  The references identified in subsection (b)(1)(ii) and (2)(ii) are as follows:

   (1)  EPA, Office of Policy, Planning and Evaluation, Methods for Evaluating the Attainment of Cleanup Standards, Volume 1: Soils and Solid Media, EPA 230/02-89-042, Washington, D. C. 1989.

   (2)  EPA, Office of Solid Waste Management Division, Test Methods for Evaluating Solid Waste, SW-846 Volume II: Field Methods, EPA, November 1985, Third Edition.

   (3)  EPA, Office of Solid Waste Management Division, Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Interim Final Guidance, EPA, Washington, D.C., April, 1989.

   (4)  EPA, Office of Solid Waste Management Division, Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Addendum to Interim Final Guidance, EPA, Washington, D.C., June, 1992.

   (5)  40 CFR 264 and 265 (relating to standards for owners and operators of hazardous waste treatment, storage, and disposal facilities; and interim status standards for owners and operators of hazardous waste treatment, storage, and disposal facilities).

TABLE 1--MEDIUM-SPECIFIC CONCENTRATIONS (MSCs) FOR ORGANIC REGULATED SUBSTANCES IN GROUNDWATER

REGULATED SUBSTANCE	CASRN	USED AQUIFERS								NON-USE AQUIFERS
		TDS <= 2500				TDS > 2500
		R		NR		R		NR		R		NR
ACENAPHTHENE	83-32-9	2,200	G	3,800	S	3,800	S	3,800	S	3,800	S	3,800	S
ACENAPHTHYLENE	208-96-8	2,200	G	6,100	G	16,000	S	16,000	S	16,000	S	16,000	S
ACEPHATE	30560-19-1	76	G	300	G	7,600	G	30,000	G	76	G	300	G
ACETALDEHYDE	75-07-0	19	N	52	N	1,900	N	5,200	N	19	N	52	N
ACETONE	67-64-1	3,700	G	10,000	G	370,000	G	1,000,000	G	37,000	G	100,000	G
ACETONITRILE	75-05-8	170	N	350	N	17,000	N	35,000	N	1,700	N	3,500	N
ACETOPHENONE	98-86-2	3,700	G	10,000	G	370,000	G	1,000,000	G	3,700	G	10,000	G
ACETYLAMINOFLUORENE, 2- (2AAF)	53-96-3	0.17	G	0.68	G	17	G	68	G	170	G	680	G
ACROLEIN	107-02-8	0.055	N	0.12	N	5.5	N	12	N	0.55	N	1.2	N
ACRYLAMIDE	79-06-1	0.033	N	0.14	N	3.3	N	14	N	0.033	N	0.14	N
ACRYLIC ACID	79-10-7	2.8	N	5.8	N	280	N	580	N	280	N	580	N
ACRYLONITRILE	107-13-1	0.63	N	2.7	N	63	N	270	N	63	N	270	N
ALACHLOR	15972-60-8	2	M	2	M	200	M	200	M	2	M	2	M
ALDICARB	116-06-3	7	M	7	M	700	M	700	M	7,000	M	7,000	M
ALDRIN	309-00-2	0.0087	N	0.037	N	0.87	N	3.7	N	0.87	N	3.7	N
ALLYL ALCOHOL	107-18-6	49	N	100	N	4,900	N	10,000	N	4,900	N	10,000	N
AMINOBIPHENYL, 4-	92-67-1	0.031	G	0.12	G	3.1	G	12	G	31	G	120	G
AMITROLE	61-82-5	0.7	G	2.8	G	70	G	280	G	700	G	2,800	G
AMMONIA	7664-41-7	30,000	H	30,000	H	3,000,000	H	3,000,000	H	30,000	H	30,000	H
AMMONIUM SULFAMATE	7773-06-0	2,000	H	2,000	H	200,000	H	200,000	H	2,000	H	2,000	H
ANILINE	62-53-3	2.8	N	5.8	N	280	N	580	N	2.8	N	5.8	N
ANTHRACENE	120-12-7	66	S	66	S	66	S	66	S	66	S	66	S
ATRAZINE	1912-24-9	3	M	3	M	300	M	300	M	3	M	3	M
BAYGON (PROPOXUR)	114-26-1	3	H	3	H	300	H	300	H	3,000	H	3,000	H
BENOMYL	17804-35-2	1,800	G	2,000	S	2,000	S	2,000	S	1,800	G	2,000	S
BENTAZON	25057-89-0	1,100	G	3,100	G	110,000	G	310,000	G	1,100	G	3,100	G
BENZENE	71-43-2	5	M	5	M	500	M	500	M	500	M	500	M
BENZIDINE	92-87-5	0.0029	G	0.011	G	0.29	G	1.1	G	2.9	G	11	G
BENZO(A)ANTHRACENE	56-55-3	0.9	G	3.6	G	11	S	11	S	11	S	11	S
BENZO(A)PYRENE	50-32-8	0.2	M	0.2	M	3.8	S	3.8	S	3.8	S	3.8	S
BENZO(B)FLUORANTHENE	205-99-2	0.9	G	1.2	S	1.2	S	1.2	S	1.2	S	1.2	S
BENZO(GHI)PERYLENE	191-24-2	0.26	S	0.26	S	0.26	S	0.26	S	0.26	S	0.26	S
BENZO(K)FLUORANTHENE	207-08-9	0.55	S	0.55	S	0.55	S	0.55	S	0.55	S	0.55	S
BENZOIC ACID	65-85-0	150,000	G	410,000	G	2,700,000	S	2,700,000	S	150,000	G	410,000	G

TABLE 1--MEDIUM-SPECIFIC CONCENTRATIONS (MSCs) FOR ORGANIC REGULATED SUBSTANCES IN GROUNDWATER (Continued)

REGULATED SUBSTANCE	CASRN	USED AQUIFERS								NON-USE AQUIFERS
		TDS <= 2500				TDS > 2500
		R		NR		R		NR		R		NR
BENZOTRICHLORIDE	98-07-7	0.051	G	0.2	G	5.1	G	20	G	51	G	200	G
BENZYL ALCOHOL	100-51-6	11,000	G	31,000	G	1,100,000	G	3,100,000	G	11,000	G	31,000	G
BENZYL CHLORIDE	100-44-7	0.87	N	3.7	N	87	N	370	N	87	N	370	N
BHC, ALPHA-	319-84-6	0.1	G	0.41	G	10	G	41	G	100	G	410	G
BHC, BETA-	319-85-7	0.37	G	1.4	G	37	G	100	S	100	S	100	S
BHC, DELTA-	319-86-8	22	G	61	G	2,200	G	6,100	G	8,000	S	8,000	S
BHC, GAMMA (LINDANE)	58-89-9	0.2	M	0.2	M	20	M	20	M	200	M	200	M
BIPHENYL, 1,1-	92-52-4	1,800	G	5,100	G	7,200	S	7,200	S	7,200	S	7,200	S
BIS(2-CHLOROETHYL)ETHER	111-44-4	0.13	N	0.55	N	13	N	55	N	13	N	55	N
BIS(2-CHLORO-ISOPROPYL)ETHER	108-60-1	300	H	300	H	30,000	H	30,000	H	30,000	H	30,000	H
BIS(CHLOROMETHYL)ETHER	542-88-1	0.00069	N	0.0029	N	0.069	N	0.29	N	0.069	N	0.29	N
BIS(2-ETHYLHEXYL) PHTHALATE	117-81-7	6	M	6	M	290	S	290	S	290	S	290	S
BISPHENOL A	80-05-7	1,800	G	5,100	G	120,000	S	120,000	S	120,000	S	120,000	S
BROMACIL	314-40-9	80	H	80	H	8,000	H	8,000	H	80	H	80	H
BROMOCHLOROMETHANE	74-97-5	90	H	90	H	9,000	H	9,000	H	90	H	90	H
BROMODICHLOROMETHANE	75-27-4	100	M	100	M	10,000	M	1,0000	M	100	M	100	M
BROMOMETHANE	74-83-9	10	H	10	H	1,000	H	1,000	H	1,000	H	1,000	H
BROMOXYNIL	1689-84-5	730	G	2,000	G	73,000	G	130,000	S	730	G	2,000	G
BROMOXYNIL OCTANOATE	1689-99-2	80	S	80	S	80	S	80	S	80	S	80	S
BUTADIENE, 1,3-	106-99-0	0.15	N	0.65	N	15	N	65	N	15	N	65	N
BUTYL ALCOHOL, N-	71-36-3	970	N	2,000	N	97,000	N	200,000	N	9,700	N	20,000	N
BUTYLATE	2008-41-5	350	H	350	H	35,000	H	35,000	H	350	H	350	H
BUTYLBENZENE, N-	104-51-8	1,500	G	4,100	G	15,000	S	15,000	S	1,500	G	4,100	G
BUTYLBENZENE, SEC-	135-98-8	1,500	G	4,100	G	17,000	S	17,000	S	1,500	G	4,100	G
BUTYLBENZENE, TERT-	98-06-6	1,500	G	4,100	G	30,000	S	30,000	S	1,500	G	4,100	G
BUTYLBENZYL PHTHALATE	85-68-7	2,700	S	2,700	S	2,700	S	2,700	S	2,700	S	2,700	S
CAPTAN	13-36-2	190	G	500	S	500	S	500	S	500	S	500	S
CARBARYL	63-25-2	700	H	700	H	70,000	H	70,000	H	120,000	S	120,000	S
CARBAZOLE	86-74-8	33	G	130	G	1,200	S	1,200	S	1,200	S	1,200	S
CARBOFURAN	1563-66-2	40	M	40	M	4,000	M	4,000	M	40	M	40	M
CARBON DISULFIDE	75-15-0	1,900	N	4,100	N	190,000	N	410,000	N	1,900	N	4,100	N
CARBON TETRACHLORIDE	56-23-5	5	M	5	M	500	M	500	M	50	M	50	M
CARBOXIN	5234-68-4	700	H	700	H	70,000	H	70,000	H	700	H	700	H
CHLORAMBEN	133-90-4	100	H	100	H	10,000	H	10,000	H	100	H	100	H

TABLE 1--MEDIUM-SPECIFIC CONCENTRATIONS (MSCs) FOR ORGANIC REGULATED SUBSTANCES IN GROUNDWATER (Continued)

REGULATED SUBSTANCE	CASRN	USED AQUIFERS								NON-USE AQUIFERS
		TDS <= 2500				TDS > 2500
		R		NR		R		NR		R		NR
CHLORDANE	57-74-9	2	M	2	M	56	S	56	S	56	S	56	S
CHLORO-1,1-DIFLUOROETHANE, 1-	75-68-3	140,000	N	290,000	N	1,400,000	S	1,400,000	S	140,000	N	290,000	N
CHLORO-1-PROPENE, 3- (ALLYL CHLORIDE)	107-05-1	2.8	N	5.8	N	280	N	580	N	280	N	580	N
CHLOROACETOPHENONE, 2-	532-27-4	0.31	G	0.88	G	31	G	88	G	310	G	880	G
CHLOROANILINE, P-	106-47-8	150	G	410	G	15,000	G	41,000	G	150	G	410	G
CHLOROBENZENE	108-90-7	100	M	100	M	10,000	M	10,000	M	10,000	M	10,000	M
CHLOROBENZILATE	510-15-6	2.4	G	9.6	G	240	G	960	G	2,400	G	9,600	G
CHLOROBUTANE, 1-	109-69-3	15,000	G	41,000	G	680,000	S	680,000	S	15,000	G	41,000	G
CHLORODIBROMOMETHANE	124-48-1	100	M	100	M	10000	M	10000	M	10000	M	10000	M
CHLORODIFLUOROMETHANE	75-45-6	100	H	100	H	10,000	H	10,000	H	100	H	100	H
CHLOROETHANE	75-00-3	230	G	900	G	23,000	G	90,000	G	23,000	G	90,000	G
CHLOROFORM	67-66-3	100	M	100	M	10,000	M	10,000	M	1,000	M	1,000	M
CHLORONAPHTHALENE, 2-	91-58-7	2,900	G	8,200	G	12,000	S	12,000	S	2,900	G	8,200	G
CHLORONITROBENZENE, P-	100-00-5	37	G	140	G	3,700	G	14,000	G	37	G	140	G
CHLOROPHENOL, 2-	95-57-8	40	H	40	H	4,000	H	4,000	H	40	H	40	H
CHLOROPRENE	126-99-8	19	N	41	N	1,900	N	4,100	N	1,900	N	4,100	N
CHLOROPROPANE, 2-	75-29-6	280	N	580	N	28,000	N	58,000	N	280	N	580	N
CHLOROTHALONIL	1897-45-6	60	G	240	G	600	S	600	S	60	G	240	G
CHLOROTOLUENE, O-	95-49-8	100	H	100	H	10,000	H	10,000	H	100	H	100	H
CHLORPYRIFOS	2921-88-2	20	H	20	H	1,100	S	1100	S	20	H	20	H
CHLORSULFURON	64902-72-3	1,800	G	5,100	G	130,000	S	130,000	S	1,800	G	5,100	G
CHLORTHAL-DIMETHYL (DACTHAL) (DCPA)	1861-32-1	400	H	400	H	500	S	500	S	500	S	500	S
CHRYSENE	218-01-9	1.9	S	1.9	S	1.9	S	1.9	S	1.9	S	1.9	S
CRESOL	1319-77-3	180	G	510	G	18,000	G	51,000	G	18,000	G	51,000	G
CRESOL, 0- (METHYLPHENOL, 2-)	95-48-7	1,800	G	5,100	G	180,000	G	510,000	G	180,000	G	510,000	G
CRESOL, M (METHYLPHENOL, 3-)	108-39-4	1,800	G	5,100	G	180,000	G	510,000	G	1,800,000	G	2,500,000	S
CRESOL, P (METHYLPHENOL, 4-)	106-44-5	180	G	510	G	18,000	G	51,000	G	180,000	G	510,000	G
CRESOL, P-CHLORO-M-	59-50-7	180	G	510	G	18,000	G	51,000	G	180	G	510	G
CROTONALDEHYDE	4170-30-3	0.079	N	0.34	N	7.9	N	34	N	7.9	N	34	N
CROTONALDEHYDE, TRANS-	123-73-9	0.079	G	0.34	G	7.9	G	34	G	7.9	G	34	G
CUMENE	98-82-8	1,100	N	2,300	N	50,000	S	50,000	S	50,000	S	50,000	S
CYCLOHEXANONE	108-94-1	49,000	N	100,000	N	4,900,000	N	10,000,000	N	49,000	N	100,000	N
CYFLUTHRIN	68359-37-5	1	S	1	S	1	S	1	S	1	S	1	S
CYROMAZINE	66215-27-8	270	G	770	G	27,000	G	77,000	G	270	G	770	G

TABLE 1--MEDIUM-SPECIFIC CONCENTRATIONS (MSCs) FOR ORGANIC REGULATED SUBSTANCES IN GROUNDWATER (Continued)

REGULATED SUBSTANCE	CASRN	USED AQUIFERS								NON-USE AQUIFERS
		TDS <= 2500				TDS > 2500
		R		NR		R		NR		R		NR
DDD, 4,4'-	72-54-8	0.62	N	2.7	N	62	N	160	S	62	N	160	S
DDE, 4,4'-	72-55-9	1.9	G	7.6	G	40	S	40	S	40	S	40	S
DDT, 4,4'-	50-29-3	1.9	G	5.5	S	5.5	S	5.5	S	5.5	S	5.5	S
DI(2-ETHYLHEXYL)ADIPATE	103-23-1	400	M	400	M	40,000	M	40,000	M	200,000	S	200,000	S
DIALLATE	2303-16-4	2.5	N	10	N	250	N	1,000	N	250	N	1,000	N
DIAMINOTOLUENE, 2,4-	95-80-7	0.21	G	0.81	G	21	G	81	G	210	G	810	G
DIAZINON	333-41-5	0.6	H	0.6	H	60	H	60	H	0.6	H	0.6	H
DIBENZO(A,H)ANTHRACENE	53-70-3	0.09	G	0.36	G	0.6	S	0.6	S	0.6	S	0.6	S
DIBROMO-3-CHLOROPROPANE, 1,2-	96-12-8	0.2	M	0.2	M	20	M	20	M	20	M	20	M
DIBROMOBENZENE, 1,4-	106-37-6	370	G	1,000	G	20,000	S	20,000	S	370	G	1,000	G
DIBROMOETHANE, 1,2- (ETHYLENE DIBROMIDE)	106-93-4	0.05	M	0.05	M	5	M	5	M	5	M	5	M
DIBROMOMETHANE	74-95-3	97	N	200	N	9,700	N	20,000	N	9,700	N	20,000	N
DIBUTYL PHTHALATE, N-	84-74-2	3,700	G	10,000	G	370,000	G	400,000	S	400,000	S	400,000	S
DICHLORO-2-BUTENE, 1,4-	764-41-0	0.016	N	0.069	N	1.6	N	6.9	N	0.016	N	0.069	N
DICHLOROBENZENE, 1,2-	95-50-1	600	M	600	M	60,000	M	60,000	M	60,000	M	60,000	M
DICHLOROBENZENE, 1,3-	541-73-1	600	H	600	H	60,000	H	60,000	H	60,000	H	6,0000	H
DICHLOROBENZENE, P-	106-46-7	75	M	75	M	7,500	M	7,500	M	7,500	M	7,500	M
DICHLOROBENZIDINE, 3,3'-	91-94-1	1.5	G	5.8	G	150	G	580	G	1,500	G	3,100	S
DICHLORODIFLUOROMETHANE (FREON 12)	75-71-8	1,000	H	1,000	H	100,000	H	100,000	H	100,000	H	100,000	H
DICHLOROETHANE, 1,1-	75-34-3	27	N	110	N	2700	N	11,000	N	270	N	1,100	N
DICHLOROETHANE, 1,2-	107-06-2	5	M	5	M	500	M	500	M	50	M	50	M
DICHLOROETHYLENE, 1,1-	75-35-4	7	M	7	M	700	M	700	M	70	M	70	M
DICHLOROETHYLENE, CIS-1,2-	156-59-2	70	M	70	M	7,000	M	7,000	M	700	M	700	M
DICHLOROETHYLENE, TRANS-1,2-	156-60-5	100	M	100	M	10,000	M	10,000	M	1,000	M	1,000	M
DICHLOROMETHANE (METHYLENE CHLORIDE)	75-09-2	5	M	5	M	500	M	500	M	500	M	500	M
DICHLOROPHENOL, 2,4-	120-83-2	20	H	20	H	2,000	H	2,000	H	20,000	H	20,000	H
DICHLOROPHENOXYACETIC ACID, 2,4- (2,4-D)	94-75-7	70	M	70	M	7,000	M	7,000	M	7,000	M	7,000	M
DICHLOROPROPANE, 1,2-	78-87-5	5	M	5	M	500	M	500	M	50	M	50	M
DICHLOROPROPENE, 1,3-	542-75-6	6.6	G	26	G	660	G	2,600	G	660	G	2,600	G
DICHLOROPROPIONIC ACID, 2,2- (DALAPON)	75-99-0	200	M	200	M	20,000	M	20,000	M	20,000	M	20,000	M
DICHLORVOS	62-73-7	0.52	N	2.2	N	52	N	220	N	0.52	N	2.2	N
DICYCLOPENTADIENE	77-73-6	0.55	N	1.2	N	55	N	120	N	0.55	N	1.2	N

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