/Filter /FlateDecode �X2{�;���������� u%�0W�� ��4���. Background Data Sources • United States USGS P 1648 (2001) • California Kearney Report (1996) • Los Angeles Basin LAUSD Arsenic Study • Site Specific Data Sets. stream The arsenic background concentration (19parts per million) was supportedby Caltrans in a study of 1- 880 site data and data from other sites in the bay area. 3�,�S�)x��mw'C���yZK���P�~��Y�N)e�Aʏ Arsenic, barium, chromium, cobalt, copper, lead, nickel, vanadium, and zinc were detected in all 28 soil samples, all at concentrations below their respective RSLs or DTSC-determined arsenic background concentration. /Pages 2 0 R Daily ambient air monitoring for lead and arsenic continues to be performed at the fenceline of the Vernon facility as required by South Coast AQMD Rule 1420.1 and the Title V permit, and it is also a requirement of Exide’s Closure Implementation Plan, which is under the oversight of DTSC. Background Concentrations of Metals, ... Department of Toxic Substances Control Geological Services Unit, Glendale. The Department of Toxic Substances Control’s Leadspread model (DTSC, 2007) was used to ... combined with an assumed background lead exposure from food, air, and water, would result in a ... OEHHA stated “The health-based screening number for arsenic is intended for arsenic ... Background. [�_�6������0���m.���1�FY�Dbh3�}��}����l7���ѥ The Arsenic Rule: Background and Rule Provisions • This presentation provides background information on arsenic and addresses the basic provisions of the Arsenic Rule. /78710646-9b21-4ca9-8a5f-e2c3cac161b7 66 0 R 22 0 obj The arsenic concentrations exceeded the DTSC ambient background concentration of 25 mg/kg, established for Lots 12 and 13, at 19 locations. /Length 9 2008). %PDF-1.5 %���� 1 0 obj 2y�.-;!���K�Z� ���^�i�"L��0���-�� @8(��r�;q��7�L��y��&�Q��q�4�j���|�9�� endstream stream %���� DTSC recommended background concentrations for soil, sediment, and surface water for arsenic are provided in the "DTSC Summary Table". 2 partially explained by variations in soil type. DTSC/HERD used the combined arsenic data from 19 sites (1097 individual sample locations) to establish a regional, ambient arsenic range for the Los Angeles area. /Filter /FlateDecode /Outlines 3 0 R Arsenic is an element, which is classified as a semi-metal. << >> Sign in (Note: )�I��:9ÒLʼn°�#���Xf��~���I ��a�:��J�B0��;X��A�I3�����3���������v؏��5x1%/�e�)���R�`4� �)���)� �x������ڨ���'P�)t��mw'��T��}V�(�x�tܓ�%��"�}�Q��� �]b��eP��R/�)�ӂ�� ���#���Z�N�����&�t�VW�;-Ø3.�?�4wt]���61&�0crƛfLqlLM������Aę���!�dc�L�`�L��ܐ+�t�Pǖ��Bw��\2���"�hv���j���K�����,�XL���wq|| 6�`�Q��ADjN4�99�YdϜĻ��5����5���!njOv^]�μ^x�Dm����2���4�*̛��&��M]ST�p����Q�q�;Y��炩�|�?h���4�Ͱ�3����Q�+�O��ٝ�S`R�iZ�U��K:�O�" sz5��u�o ���/��-��Ԝh�qsr�5����K^Σ&�F�` YSg���ur����賝e��O����QX�Ԛ�a�Y�3������e���-����5(C}ɂ6̗`B�3y���� ��"����{�G;n'��s58_&QF���N�)0)�4�kJ�ʻ�wr�bx����&�#m��A@jN4�Ŝ�a .���"�e.�Q#i�^����;�i�:��z�����E}h`S{�hO�tW���x��z}+��>l �P�� �'�k��� �qU��$�Ӧ����"e�H��E���N�)0�Ȏ��%��crՀn8�$��]�5�6�C̠"u'���N�Ć�#br(b&mԋ�8u(;1\'Wb��)�;`��!��}�� 3�&5,Ф\ð(#&������58�)�u�OY���T3�3�ûOi~ѻO=G��Щ O���ٝ�T`�"9�)���Kj�)g �$�����I��e�:Mjq(gX0����RhK-s���^����;�i�:9�z��N�Cڨ+jjL��əm endstream Site-specific background levels approved by DTSC using a two tiered approach. /Length 184 stream endstream Background Exide Technologies - Battery Recycling Plant Exide’s operations resulted in the release of harmful levels of lead and arsenic into the environment in … x^ R R n�3ܣ�k�Gݯz=��[=��=�B�0FX'�+������t���G�,�}���/���Hh8�m�W�2p[����AiA��N�#8$X�?�A�KHI�{!7�. /AcroForm 4 0 R Sign in. ˮ� �дVx ���Mkey&E ��z�Cu�������\R�M���Q�U�~~�~ߔ��H������Aw��`2!s���펅#I��y��NZ���yTRVE��}g��N���RT��������e���@+��0 ��J��(걂��V��tPl��7`P�Rj�f##�6 stream /Length 5114 (U����F.+ Suggested language: "DTSC established a regional background arsenic concentration of 12 mg/kg in soil that can be used as a screening tool for … DTSC will no longer provide guidance for specifically for ACM found in buildings and structures, DTSC will continue providing guidance for naturally-occurring asbestos. Arsenic is one of the more contentious metals because the concentration at which it poses an unacceptable risk is often well below background and ambient levels typically encountered. https://bcs-1.itrcweb.org/7-4-when-does-it-make-sense-to-use-bioavailability At nine sample locations, from three different areas, concentrations of arsenic in soil samples (in mg/kg) exceeded 10-times the STLC limit (5 mg/L), and samples from each area were /Length 9 According to the DTSC, “Most of the arsenic is in the shallow soil (less than five feet below ground surface) and is above DTSC’s protective standards.” In June, a public meeting was held by the DTSC to discuss various cleanup alternatives. 23 0 obj 2.0 BACKGROUND Education Code sections 17210, 17210.1, 17213.1, and 17213.2, specify a comprehensive environmental review process under DTSC oversight for proposed new /Filter /FlateDecode ��w�G� xR^���[�oƜch�g�`>b���$���*~� �:����E���b��~���,m,�-��ݖ,�Y��¬�*�6X�[ݱF�=�3�뭷Y��~dó ���t���i�z�f�6�~`{�v���.�Ng����#{�}�}��������j������c1X6���fm���;'_9 �r�:�8�q�:��˜�O:ϸ8������u��Jq���nv=���M����m����R 4 � Ambient air is also expected to contain arsenic in background concentrations ranging from 0.04 to 1.0 µg/m 3. Arsenic Background . >> The methods used to calculate the site-specific background concentration of arsenic are presented in Appendix E of this report. >> << 24 0 obj Arsenic RBA Study Grant Background DTSC applied for EPA Brownsfield Training, Research & Technical Assistance Grant 5/08 Grant awarded 3/09 in the amount of $750,000 Research will focus on the threat to human health due to arsenic at mine scarred lands (MSL) /ProcSet [/PDF /Text] California conducted by the Department of Toxic Substances Control (DTSC), an arsenic concentration of 12 mg/kg may be a useful screening level when evaluating arsenic as a chemical of potential concern (Determination of a Southern California Regional Background Arsenic Concentration in Soil, DTSC. endobj x^+ r r /BBox [0 0 510.852 682.2718] The concentrations of arsenic and dioxin TEQ, and the ... Point Concentration (EPC) of 103 mg/kg. DTSC_Background-Arsenic.pdf - Google Drive. >> >> x^ŝ]s�8���S�����M�"� ��$���Twf*��ź���i[}�$9����� ���z�9���� �-��X��h��m�w�u���ݯݾZE�M����W��{���8�X�o��\&,)��������ߪ�y�����k�������I+���>�~��U�X^ĩ�fIβ4i��J��h�L&q.�m�����T,Y�R �rU��T*f�H�$����*� !�0MR��D�T��)�fR�'*�T�D��̐*��;�xUȂ�y���m�gټT3Y��Y���y9�9�-"�F� ���M��m���!2��� �������� %D}��_p�����}tM�TWKo�Y� /Subtype /Form H���yTSw�oɞ����c [���5la�QIBH�ADED���2�mtFOE�.�c��}���0��8��8G�Ng�����9�w���߽��� �'����0 �֠�J��b� endobj 1 0 obj<> endobj 2 0 obj<> endobj 3 0 obj<> endobj 4 0 obj<> endobj 7 0 obj<> endobj 8 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>>>> endobj 10 0 obj<> endobj 11 0 obj<> endobj 12 0 obj<> endobj 13 0 obj<> endobj 14 0 obj[/ICCBased 18 0 R] endobj 16 0 obj<> endobj 17 0 obj<> endobj 18 0 obj<>stream Arsenic is a naturally occurring element present in Bay Area soils in concentrations of 5 to 20 mg/kg (parts per million). %PDF-1.5 Based on this statistical analysis, the background concentration of arsenic in soil within Lot 1 and Lot 2 was estimated to be 18.7 milligrams per kilogram (mg/kg). stream It is a solid substance that is naturally found in the Earth’s crust. Trinity facilitated calculating a site-specific arsenic background soil concentration of 17 mg/kg based on historical and current site data, following DTSC guidance. Arsenic Action Level = 26 mg/kg: Upper prediction limit: 2.4E-04 Risk Factor Arsenic Background = 16 mg/kg: Upper limit – clean up goal: 1.5E-04 Risk Factor endobj 9�������v�{��_�?8�ߌɬI� �v�_pdwu+������������G� Background Arsenic Concentration The background mean concentration presented as an option in the selection of Tier 2 soil cleanup levels is adopted from Bradford et al. CLEANUP GOALS FOR METALS IN SOIL NAPA COUNTY QLS GEOLOGIC AREA Background US EPA RSL (a) CalEPA CHHSL (b) DTSC HERO (c) Cleanup Goal 0.626 31 30 - 30 7.062 0.7 0.1 0.07 7.1 << As such, it is expected that soil and dust samples will contain some background levels of arsenic. G�%�����_]�&��ݽN*Α4L55%E>Iy�%5m�Ǥ�ͅg�%y�CC�p�������_�Z�O�hY�}�ض���9�,�8������^�a���(s����@�R��8T���������M��ۦ���M����;�jU#��GҤ�=i��0%�N�t:oڪ��`\1�2>�KK�Hb�b����ϟ��� Substances (DTSC) guidance documents (DTSC, 1997 and 2009). << Between 1995 and 2001, over 1,600 background soil samples were collected from 189 sites Appendix B. Chemical-specific summaries of the information used to derive unit risk and cancer potency values.Updated 2011. at or above laboratory RLs in any soil sample collected at the site. A site-specific background concentration of arsenic along the Branch Line was calculated to be 14.4 milligrams per kilogram (mg/kg). N'��)�].�u�J�r� endobj /Type /Catalog In subsequent meetings with the DTSC and within the March 14, 2007 DTSC comment letter for the Lot 1 and 2 RI, the Respondents have been /92ae7305-f204-4d8b-aa5e-ea52ff8cb0a6 67 0 R 26 0 obj 8. �ꇆ��n���Q�t�}MA�0�al������S�x ��k�&�^���>�0|>_�'��,�G! Eco-SSL for Arsenic 3 March 2005 0 5 10 15 20 25 30 East West Conc (mg/kg dw) Figure 2.1 Typical Background Concentrations of Arsenic in U.S. Soils. /Length 211 The term “background” collectively refers to both naturally occurring and anthropogenic concentrations in … arsenic background data set to provide insight on typical concentrations of arsenic that are naturally occurring or represent anthropogenic background. /Filter /FlateDecode • The Final Arsenic Rule was published in the Federal Register on January 22, 2001 (66€FR€6976). TABLE 1. x^mN� /Type /XObject endobj �0��{�1�$&�s��B�A�hR5��}�-�R�}0���Δ���;�!ԁ�����s�8A0b��������V2 ��]k0�����(�������fU�R�Sr�No�����?9t����#��[��&[å囜 �Uk��)��"/shJV(k��k��(����oG� (1996), which California Department of Toxic Substances Control (DTSC) routinely dismisses as a background concentration estimates are regional estimates, not site-specific, and may not be representative of soil throughout … Maximum 95th 25th 50th 75th 5th Percentile soil concentrations in eastern and << https://www.epa.gov/risk/regional-screening-levels-rsls-users-guide �7)`4�.�� �! "F$H:R��!z��F�Qd?r9�\A&�G���rQ��h������E��]�a�4z�Bg�����E#H �*B=��0H�I��p�p�0MxJ$�D1��D, V���ĭ����KĻ�Y�dE�"E��I2���E�B�G��t�4MzN�����r!YK� ���?%_&�#���(��0J:EAi��Q�(�()ӔWT6U@���P+���!�~��m���D�e�Դ�!��h�Ӧh/��']B/����ҏӿ�?a0n�hF!��X���8����܌k�c&5S�����6�l��Ia�2c�K�M�A�!�E�#��ƒ�d�V��(�k��e���l ����}�}�C�q�9 The Department of Toxic Substances Control (DTSC) established a regional background arsenic concentration in soil that can be used as a screening tool for sites throughout southern California. �V��)g�B�0�i�W��8#�8wթ��8_�٥ʨQ����Q�j@�&�A)/��g�>'K�� �t�;\�� ӥ$պF�ZUn����(4T�%)뫔�0C&�����Z��i���8��bx��E���B�;�����P���ӓ̹�A�om?�W= 94 Chapter 9 ARSENIC CLEANUP CRITERIA FOR SOILS IN THE US AND ABROAD: COMPARING GUIDELINES AND UNDERSTANDING INCONSISTENCIES Christopher M. Teaf1,2§, Douglas J. Covert2, Patrick A. Teaf2, Emily Page2, Michael J. Starks3 1 Center for Biomedical & Toxicological Research, Florida State University, 2035 E. Dirac Dr., Tallahassee, FL 32310; 2 Hazardous Substance & Waste … Consequently, DTSC advises employing the 95th UCL on the arithmetic mean as background concentrations of metals in surface soil (n=18), and the mean concentrations of metals in sediments (n=13). It can be incorporated into soil, dust, water, food, and air particles. >> The chemical abbreviation of arsenic is As (Figure 1). �x������- �����[��� 0����}��y)7ta�����>j���T�7���@���tܛ�`q�2��ʀ��&���6�Z�L�Ą?�_��yxg)˔z���çL�U���*�u�Sk�Se�O4?�c����.� � �� R� ߁��-��2�5������ ��S�>ӣV����d�`r��n~��Y�&�+`��;�A4�� ���A9� =�-�t��l�`;��~p���� �Gp| ��[`L��`� "A�YA�+��Cb(��R�,� *�T�2B-� Air Toxics Hot Spots Program Technical Support Document for Cancer Potencies. /Resources << /Font << DTSC residential use soil screening level for arsenic in soil is 0.11 mg/kg (DTSC 2019) resulting in a residential cancer risk estimate of 1E-04 for the upper-bound arsenic background screening concentration of 12 mg/kg and a residential cancer risk of 2E … https://bcs-1.itrcweb.org/7-3-methodology-for-evaluating-arsenic-bioavailability — "Because the background, naturally occurring concentrations of arsenic.. ' this sentence is not clear and should be revised. Department of Toxic Substances Control (DTSC) guidance documents including but not limited to: • Selecting Inorganic Constituents as Chemicals of Potential Concern at Risk Assessments at Hazardous Waste Sites and Permitted Facilities, February 1997 and • Arsenic Strategies, Determination of Arsenic Remediation, Development of Arsenic Estimates of the mean and range for trace /Filter /FlateDecode 25 0 obj >> x^��=n�0�w����T�okn/P�@gI����Zz�Zi�%-�A��R��^�!���e9�9Td��Zqf�� �z���)�\�k:�Zci�����氜Ƽn/Zr���]Z�ht�o�)9S��r{�XB^�����O����[)\\�����h!���7ƥ#&%�bo����pҩc�!z�ገ�J��i�u6 wܖ߳�W� << OEHHA 2009. >> endstream thesis aims to estimate background arsenic concentrations in soil around the Bay Area, and investigate whether spatial variability in arsenic concentrations can be at least . The... Point concentration ( EPC ) of 103 mg/kg air particles 0.04 1.0! A site-specific background concentration of arsenic is an element, which is classified a... 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