Watsonville City Council
March 14, 2023

Test Report - RGA Environmental , Inc.

Polarized Light Microscopy Analysis Results
Project AOC108673
-------------· ------------------Asbestos---· ------------------- ---------· -----------N onasbeslos------------------· --- Sample Number I Mineral Fibrous Synthetic 01her NonFibrous Run Date Sample Appearance Client Sample Number Chrysotile Amosite Crocidoiite An1t10pnyiiite Tremoliie Aciinollie Cellulose Woe! GI.ass Fibers Fibers Material Analyst 17478(;1CPL 133146
White drywall; wht comp NFM; Qlz, Carb, Binder, Opaq, Misc. Par1. 1747862.CPL 126395 8% 5%
Brown VSF; blk. felt NFM: Qlz, Tar, Carb, Binder, Opaq, Misc. Part.

Layer Con1en1: VSF 15% Chrysolile ; Other Layer: None Detecled 17 4 7863CPL 126396
Sample Localio11 Sample Not Analyzed
1747864CPL 133137
While window putty NFM: QLZ, Carb, Binder, Opaq, Misc. Part. 174786SCPL 117169
White window puuy N FM: QLZ, Carb, Binder, Opaq, Misc. Part. 1747866CPL 133143
Black mastic; dk. grey carpet NFM: Qlz, Carb, Binder, Opaq, Misc. ParL 70%
100 % 8/31!01
SSY
Non Homogeneous
87% 8131/01
SSY
Non Homogeneous
100% 8/31{01
SSY
Homogeneous
JOO% 8/31/01
SSY
Homogeneous
30% 8/31101
SSY
Non. Homogeneous
Samples received on: Friday, Aug us L 31. 2001 Authorized Signature-+-#.~~------------­ RJ Lee Group, Inc.

Bay Area Lah
530 McCormick Street
San Leandro, CA 94577
Date
Stephen S. Yata, Geologisl
Tuesday, Seplember 4, 2001
Phone (510) 567 -0480
Fax (510) 567-0488
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Test Report - RGA Environmental , Inc.

Polarized Light Microscopy Analysis Results
Project AOC108673
--------------------------------Asbestos----------------------· ---------------------Nonasbestos---------------------- Sample Number I Mineral Fibrous Synthetic Other NonFibrous Run Date Sample Appearance Client Sample Number Chrysoti1e Amosite Crocidoliie Anthophyllite Tremolile Actinolile Cellu1ose Wool l 747867CPL 125279 2 %
Black roof NFM: Qlz, Carb, Binder, Opaq, Misc. Part.
1747868CPL
BJack roof
117146
Samples received on: Friday, August 31, 2001
RJ Lee Group, Inc.

Bay Area lab
2%
NFM: Qtz, Carb, Binder, Opaq, Misc. Part.
530 McCormick Street
San Leandro, CA 94577
- -~~g~~-~ ~~ 4
Authorized Signa
Glass Fibers Fibers Material Analyst
98 % &131101
SSY
Homogeneous
1% 97% 8/3lf01
SSY
Homogeneous
Stephen S. Yata, Geologist
Tuesday, September4, 2001
Phone (510) 567-0480
Fax (510) 567-0488
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· SEP. 4. 2001. 1 :43PM_R J LEE GROUP INC __ -.-......,._=--=~-NO. 4122_P. )_="II RGA ENVIRONMENTAL INC. I ACM BULK SAMPLE DATA SHEET CJ4101 Dovu ST., ST!. ,, 0170 t.wtl:ETST., s~ 1249 0 9'& I l"'ST., Sm ll-l I Emeryville:, CA 94608 San FrancislllO, CA 94102 Modeslo, CA 94354 ·: PLM Analysis Tel: (S 10) S47-777l Tel: (415) &34-9660 Tel: (209) SlS-110& .: 5'op AnllYJi5 ill First Positive PAGE ..1...... OF ..l:..__ F111:; (SIO) S47·191J fax; (41.5) 834·9670 Fax: (209) 525·1109 Project Name/Address: ______________________ __.P.M. lniti11l: ___ _ RGA .Project #: Sampled By: Sampling Daie: ,
' Sample(.s) Sent To: O IU. Lee OMicro OOtber: l'umaround Time: _twh _24Hra _3-5 Days ; Fu Report To: Cl SlC>-547-1983 0 415-8'34-9670 D 209-525-810!1 0 (FH #) ________ _ i HM# Oe"'f- ~,. .... " P ... ~ ~ '' "~""' c.. Lu.J Vt\.M I .. , v..,.,. Lt-...,,.. :

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Test Report - RGA Environmental , Inc.

Polarized Light Microscopy Analysis Results
Project AOC108672
--------------------------------Asbestos----------------------· ---------------------Nonasbestos---------------------- Sl!mple Number I Mineral p;brous Synlhetic Other NonFibrous Run Date Sample Appearance Client Sample Number Chrysotiie Amosiie Cnx:idolite .t..~nthophynite Tn:.rnolite Actinolite Cellulme Wool Glass Fibers Fiben Material Analyst l 747869CPL 117150 >1 % 99 % :l/3J/01
Grey window pulty
1747870CPL
B'8ck vapor barrier
1747871CPL
IJ? 107
125274
Brown drywall; offwht. comp
1747872CPL
Offwhite drywall
117129
1747873CPL 117130
Brown sheet vinyl
1747874CPL
Black roofing
125278
Samples received on: Friday, August 3 l, 2001
. RJ Lee Group, Inc.

Bay Area Lah
N FM: Qtz, Carb, Binder, Opaq, Misc. Part.
8%
NFM: Qti, Tar, Cub, Binder, Opaq, Misc. Part.
2%
N FM: Q1z. Carb, Binder, Opaq, Gyp, Mica, Misc. Pact.
2%
NFM: Qtz, Carll, Binder, Opaq, Gyp, Mica, Misc. Part.
20%
NFM: Qtz, Carb, Tar, Binder, Opaq. Misc. Part.
18 %
NFM: Qtz, Tar, Carb, Binder, Opaq, Misc. Part.

SSY
Homogeneous
92 % 8/31101
SSY
Homogeneous
9& % 8131101
SSY
Non Homogeneous
98 % 8/31/01
SSY
Homogeneoui>
80 % 8131(01
SSY
Homogeneous
82 % 8/31/01
SSY
Homogeneous
Authorized Signature 7'H"---#--zi;;;...~ ~~~::~:::::~---­ 530 McCormick Street
San Leandro. CA 94577
____ _f~g~: l of l
Date
Stephen S. Yata, Geol isl
Tuesday, September 4, 200l
Phone (510) 567-0480
Fax ·(510) 567-0488

SEP. 4. 2001· 3:42P~R J LEE GROUP INC--.-...,..._--==r=""-NO. 4151_P. 3_/3-=-.....

RGA ENVIRONMENTAL INC. ACM
8 n.cfe()/A].7 _ I ~AMPfE:bnASHEET I 4101 Do'r'l.£ ST., STI. 14 0 170 MAlwn' ST., STI 1249 D 941 ll"Sr .. Sm 11-1 :
mayvillc:, CA 94601 San Fnncls.co, CA 94102 Modosicl, CA 94354 .. PLM Analysis ! Tel: (SI 0) 547-7771 Tel: (415) 134·9660 Tel; (209) S?S-SIOI • S!Ofl Anllytiul Fiist Positive PAGE _l_ OF .1__ I Fax: (nO) 547-1983 Fae:. (415) 834-9670 Fa: (209) 525-&109 ._ __ .._....., ______________________________ _..-!--__, ____________________ =--==--If d ProjectName/Ad<kess: ~3 y Le,h.,+ s~,.c.+ - 0 Id l\•r~·~ ,.,.;,au.u P.M.Initial:~.S ! R.GA Project#: e H fl\ M ~I U Sampled By:_k: ..... e _______ Sampling Date: I ta I fa, o I [ Sample(s) Sent To: ~ RJ. Lee OMicro OOthcr.: TumaroUDd Time: _Rwh _A.24Hrs _3-S Daysi fax Report To: I( 51~547·1983 O 415-834-9670 O 109-525-81® D (Fax#) ________ _ HM# Ool flaterlal Desctlptlon: \J ··~ '· ._, D """" Sample ID :sample Location & llaterlal lOC1111011 '" Quantity:

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LABORATORY REPORT
RGA Eil"<fro;m:1;en1al
4701 Doyle St::eet, Scite 14
CA 9-t60S
Ar..enjor.: Kennc!h Pilgrim
{510) 547-7771 FAX: (510) 547-l9S3
Analysis: Lead in Paint
Method: EPA S\\'846-7420 --· FLAA
Lend
Parts per
RJ Lee Group ___ . Mli.lion
l33l42 0336251 6.14 6L400
133114 0336252 5.06 50,60(}
11702{) 0336253 0.0553 553
117152
117141
117138
0336255
0336256

8.39 8.65

9.85 8.3,900
S6.500

98.500
RJ Lee Group fo'J '.\o.:

Sa.-::p.ks Received:

Clie:it Project:

Project Name:

Sampling D:i.:e:

Pai.?e 1 of i
350 Ho::!'::X:,rg Ro<>.d !\for'.roev:il!e. ?A 15146
Fax !72¢} 733 .. 1JC;y
ACClOS657
CID.-!!-! 6S33
234 Lc..::i.!sl S!!eet
.30-A!ig-Ol
•'t ?tJ rua•U » RJ kt Grasp*l Clf!Ttnf r.crttJ a.lid «tt:dit,iQrt1' of 1alc .. i«chtJV:g t'oftllpor.t 1J .t:lan&atJ v.ia11an11: c;Jtl /{t('.$(orion <>/ ll'.QfM(ilj pro\•isio1u., n·o r.u;t>nsit_,i(iJ'! or fioCiliry is euu.mni' {01 lftt M•tUltr 1"c •·iiic1' tltr urults art fAJt4 Vnlui irt wr/ffrt: :o 1t'Jdrt1 rht ro'tutt hy rhlr tt,or1. 10 l,,u Gro.11p "'fttr tlit .&c:Mplts fa, a ptrioi ttf dfzctr•4flt.&.

A onrl 1'.01tlfin1 lrr will bt 4SSt!11ttl for tAt tetcrt1 of an1 u:mpfiJ.

S. Pau! Cobes, Laboratory
Brz.ndoa i. !>Hiler. AHistant Sckntist
R}an :a. W:;,lters, Assis tam Sek11li$l
A.IRA ELL.\.P
CA El.AP ;111970
PA DEi' l'I02-l96
D
B :li:iot>erly S. Di.Natale. Philip Griod!i:, Sopnvhor Melisa \' aroer, Scientist D 0 Alan}.{. Le•inc .. :\1anag:cr Please direct iaquiries tB Brand an J. llillcr in Client Services.

Mo."tl"Qe\'ille, PA ·San Leandro, CA- Washington, DC
8 Date ___ _....; ____ _
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~HO I DOYLE ST., s l'E. u rJ 870 ~l\Rl(l:.'r s·r .. STE 1241) (J 1)4ll I IT"ST., STE 11·1 liinr.ryville, CA IJ 1608 S~1n Frartc:iso:;,), Cr\ 94102 ~fodcsto, CA 9-135-' '!<·I: (SIO) S-l7•7771 Td: (.tl5) SH-?660 Tel: (209) S2S·SI08 fa.x: (510) H7 ·193:l h"(: (·HS) 83-1-9670 F:t<: (21.l?) 5"?5·S 10? 'l..'"\ p Lfc-., ' Lt<v.:.l PAGE_~l OF_l_
Project Name/Addr~~s~: _.1 }_~t_~~~~'SJ l'"~ .. d-... -~. -·d'"'"'r"--:-------~--P.M. Initial: s._S~­ ROA Proj~C[ #:_(B..!.1 H. b n~~--.--.. SamplcdBy:_~~~~l.~~ p :_br: ,_ Sampling Datc:_j_/ lJ /.too' - Sample(5) Sc1\t To: 04.1u. Ler. tJMicro OOtht-r: __ ··-···--·~"-·- Turnaround Time; __ Rush X_24Hrs _j.5 Days £~/g~p,o~~.JJ!: ~ 510-5~7-1983 D '1I5"834-9670 D 209~525-8109 O (Fax#) ~--·---- _ .. ,. :!'-7:~.:!$922 .. _ ..... . . ' ·-··'·· ......... ~ .........

Paint Des cription and Sample Location
• I f !!::t :J::.~ ...... .... _ .... - - -i 14 ) Faint Color: .. l :\.) .. " . s~mpk: l.cx::t .~~ K_~re.(.". ·-·-- Substrate; Uc:;.od
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t'ait1t Color. ..

Sample l.oca
--·~-.....·---.... --- ~:..l ::ti. __ •-u••- Snb!ltrnte:. L/, .J titm: Lr.'"~' V ~tic, ..... J.Clt'""
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-
Composite Sample: Y IN
- Composite Sample: Y I N
Composite Sample: Y IN
Composite Sample: Y IN I ~~~l~=~Coh~::~ S:impl~ Loc:-i tion: f t·o~\ J•or ~I'~,., ... 0 \cl .., re~~ Jt~ct .. _........ _ _..._.,._._ .... ____ ,.,._..,,._.,. ·- P«int Color: _ \..J~: h~ Silmplc Loca
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Color:
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Composite Sample: Y IN
Composite Sample: Y IN
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~-~J~-,,.~ ... --=-~~·i·~~aturc: ~ ~ A.. f ~ · Date/Time: "ta ""fl~ 1

September 7, 2001
Mr. Cecil Gore
CH2M Hill
P.O. Box 12681
Oakland, CA 94604-2681
RE: Addiltional Paint Sample for Lead
234 ]locust Street
Wastonvilie, CA
Dear Mr. Gore:

ENVIRONMENTAL INC
Per CH2M Hill's request, RGA Environmental, Inc. (RGA) analyzed the paint film on the surface of the six (6) drywall samples collected from the interior walls and ceilings in the main residence located at 234 Locust Street in Watsonville, California. RJ Lee Group, Inc. (RJ Lee) lifted the paint film from the surface of the remaining drywall samples submitted previously for asbestos analysis. A composite of the paint samples was submitted for analysis. The paint sample was analyzed by flame atomic absorption in accordance with EPA S\V846-7420.

Lead was not detected in the composite paint sample above the laboratory limit of detection for the sample submitted. All of the paint was in good condition and intact with gypsum drywall substrate. The laboratory report and chain of custody fonn are attached.

If you have any questions regarding the sample results or this report, please contact me or the project manager, Steffen Steiner at (510) 547-7771.

R~f}{. Kenneth Pilgrim
Senior Industrial Hygienist, CAC 97-2267
Attachments: Laboratory Report and chain-of-custody form P:\CLIENT\200 I \C\CH2MHill\ Watsonville2add.doc
4701 Doyle Street
Suite 1.4
Emeryville, CA 94608
510 547 7771
FAX 547 1983

RJ Lee Group , Inc.

RGA
4701 Dcyle Suire 14
CA St:.f-CS
Attentlo:i: Kermelb Pilgrim
(5 l{)) 54'7-7771
Analysis:

Metl.-..od:

FAX: (510} 547-1983
Cornpo.,.ite Lead in Paint
EPASiV&46-7420-· FLAA
Sample
C:.ient RJ Lee
Composite 033664-9
Welsh:
<0.0091
Lf..BOR.!!..TORY REPORT
Le3.d
?:;.r:.'<
<92
RJ Lee Gm:1p iob No.:

S!r.l;>:es Received:

Report
Clie!}l Pl"Q.iect:

Pro]ecl .N'3.me:

Sa..-npling D.:11.e:
of1
3:G gochberg P.o:>d ?-lo;i.n)evi:.h, ?A 15146
(i:2.;) 315-1:776 Fax 733-1799
;.CC109519
6-Sep--0!
6-Sep-01
CHMH1S33
:::34 ::..OCust Sueet- :U....., Rrsident<!
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S. Pnl Co!ltn, 1.aboralot')' D Ki11tberly S. Diri'a11Je. Scientist -----------------·----------- D B r"ndon J. Miller, Asibtant Sci:nlisl D Philip Grindle. Soprn•iio; D A la!! Levine, M auager 0 Ryui B. Wa.J1ers. Scientist 0 Melisa Vllni.er. Anislact Scienlisl 0 AlHA EI.LAP 118204
CA ELAP i119i'O
PA DEP #0'.!-396
Please iHre.ct inquiries w Brandon J. Miller In Client Sen·ices:.

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• I flCC/tJ/5/9 ~ AC.M BULKSAMPLEDATASHEET Q4i01 DoYL£ Sr .. Sn-:. 14 0 970 M.-1..l!.Kfi Sr., STE 1241) 0 9./S I !"'ST., ST!! 11·1 F.meryvill..:. CA ~IG1)8 S:i11 F1.mcim1, O. 9·1102 MoJ,:~to, CA 94354 Td: (S!O) 5-11-TI 71 1"r.I: (41S) Sl4-%1i0 rel: (209) S2Hl08 F~·(: (i I 0) 5•17-1983 fJ:1~ (-U 5) SJ.'*-9670 fa;(; (20\l) 52.:!·B109 1 PLM Analysis
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Sent By: RGA ENVIRONMENTAL;
October 8,, 200 l
Mr. Cecil Gore
CH2MHiU
P.O. Box 12681
Oakland, CA 94604-2681
510 547 1983; Oct-8-01 17:04;
RE: Asbestos and Lead-based Paint Abatement Monitoring Report 23·4 Locust Street
W:a..11tonville, CA
Dear Mr. Gore:

E:~VIAONMENTAL INC
RGA Environmental, Inc. (RGA) conducted contractor performance monitoring during abatement: of asbestos containing flooring materials and removal of peeling lead-based paint at the captioned site in Watsonville, California on October 4, 2001. Pecon I Pacific Environmental (Pencon) abated approximately two-hundred (200) square feet of asbestos containing sheet vinyl and one-hundred twenty ( 120) square feet of suspect asbestos containing floor tile from the main residence. Damaged and peeling lead-based paint and asbestos-containing window putty were removed from the exterior of the old residence which is located north of the main residence.

Pencon constructed a negative·pressure enclosure (NPE) inside the main residence containing the living room, kitchen and adjacent bedroom. Critical barriers were installed over all openings in the NPE including windows, doorways and hallway openings. A single high efficiency particulate~ air (HEPA} filtration unit was centered in the work area to reduce airborne fiber concentration during removal activities and provide negative air-pressure to the NPE. A singlestage decontamination unit was established at the entrance to the NPE. The barriers of the NPE established the required regulated area for removal. RGA inspected the work area prior to abatemen1; and approved the construction of the NPE for abatement work Pencon manually scraped the suspect asbestos-containing floor tile from the wood subfloor in the adjacent hedroorn. A circular saw was utilized to cut the sheet vinyl and subfloor in the living room into approximately two square-foot sections and the flooring was pried from the floor joists intact. The work area and the asbestos~containing materials (ACMs) were misted with water during removal to reduce airborne fiber concentrations. All waste was initially packaged into six (6) mil po·Iyethylene (poly) bags and sealed with duct tape. ROA inspected the work area at the conclusion of the removal work to confinn complete removal and adequate cleaning of the work area. Upon approval, Pencon applied an encapsu!ant to the work aren barriers and remaining building rnaterials to reduce residual airborne fibers.

P:\CLIENT\2001 \C\CH2MHill\ WatsQnYill•abau:.doc
4701 Doyle Street
Suite 14 ~nw:ryville, CA 94608
510 547 7771
FAX 547 1983 Page 940 of 1256
Sent By: RGA ENVIRONMENTAL; 510 547 1983; Oct-8-01 17:05; Page 3/3 Pencon created a regulated area approximately fifteen (15) feet away from the perimeter of the old residence for abatement of damaged lead-based paint. Poly sheeting was secured to the base of the building and extended ten (10) feet away from the structure. Pencon manually scraped loose and damaged paint from two of the exterior walls and associated wood trim. The ACM window putty was scraped from the wood window frames intact. Minor peeling of painted surf aces on the interior of the building was not removed due to the poor structural integrity of the building. Encapsulant was applied to the exterior painted surfaces following loose paint removal to aid paint stabilization. All paint debris was packaged in six ( 6) mil poly bags and sealed.

Paint waste was transferred to an onsite disposal bin for client disposal. The ACM widow putty was packaged with ACM flooring from the main residence. Pencon temporarily stored the ACM waste in the main residence. ACM waste was repackaged on October 5, 2001 in regulated asbestos containing material (RACM) bags, sealed and transferred to a onsite disposal bin for client disposal. ·
Two (2) clearance air samples were collected inside the work area of the main residence following encapsulation. The clearance air samples were transported to Micro Analytical Laboratories, Inc. (Micro) in Emeryville. Micro analyzed the air samples by phase contrast microscopy (PCM) according to the National Institute of Occupational Satety and Health (NIOSH) Method 7400. The air samples were reported less than 0.002 fiber per cubic centimeter or less than the limit of detection. The air sample results were less than the Department of Occupational Satety and Health's (DOSH's) pennissible exposure limit (P.EL) for airborne fibers.

Based upon visual observations and the clearance air sample results, the main residence md old residence at 234 Locust Street have been abated and air quality verified less than DOS H's PEL for airborne fibers.

If you have any questions regarding the sample results or this report, please call Steffen Steiner or me at (510) 547-7771.

Kenneth Pilgrim
Senior Industrial Hygienist, CAC 97-2267
Attachments: Laboratory report, chain-of-custody form, field notes, and worker documentation P:\CUENT\2001\C\CH2MJ-Illl\W~nvillc:abate.doc Page 941 of 1256 HUMAN HEALTH RISK ASSESSMENT (HHRA) NOTE NUMBER 3,
DTSC-modified Screening Levels (DTSC-SLs)

CALIFORNIA DEPARTMENT OF TOXIC SUBTANCES CONTROL (DTSC),

HUMAN AND ECOLOGICAL RISK OFFICE (HERO)
RELEASE DATE: June 2020
ISSUE
DTSC has developed modified screening levels based on the U.S. Environmental Protection Agency (USEPA) Regional Screening Levels (RSLs) for use in the human health risk assessment process at hazardous waste sites and permitted facilities.

HHRA Note 3 is periodically updated and users should always check the DTSC website for the most recent versions, including other HHRA Notes.0F0Fa

SUMMARY
In 2008, the USEPA released RSLs to replace the Preliminary Remediation Goals (PRGs) formerly available from several USEPA Regional Headquarters.

HERO reviewed the differences in methodology and RSL concentrations to develop a methodology to incorporate the RSLs into HERO human health risk assessment consultation and review. In addition to updated toxicity criteria, several differences in methodology resulted in a subset of RSLs substantially higher (less protective) than the original PRGs and resulted in HERO issuing recommendations for use of specific screening concentrations. HERO’s review of the RSLs had been conducted in two phases: Phase I (soil and tap water screening levels) and Phase II (air screening levels). Initial versions of HHRA Note 3 (November 2009; May 2011) addressed a Phase I review only. A Phase II review was incorporated into the 21 May 2013 iteration of HHRA Note 3, and an additional update released 14 July 2014. Since July 2014, DTSC is now providing regular updates to the DTSC-SLs, tracking the updates to the USEPA RSL tables after their release. HHRA Note 3 was last updated in April 2019.

The present revision of HHRA Note 3 incorporates HERO recommendations based on adoption of the Toxicity Criteria for Human Health Risk Assessments, Screening Levels, a https://dtsc.ca.gov/human-health-risk-hero/

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

and Remediation Goals rule (hereafter “Toxicity Criteria Rule”)b and review of the May and November 2019 releases of the RSL tables. Exposure factors used in this HHRA Note 3 are consistent with the April 2019 update to HERO HHRA Note 1c, which incorporates much of the 6 February 2014 USEPA memorandum “Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default Exposure Factors. OSWER Directive 9200.1-120.”
HERO has prepared reference Tables 1, 2, and 3 that provide recommended screening levels for compounds in soil, tap water, and air, respectively. In accordance with the Toxicity Criteria Rule, the DTSC-SLs provided in Note 3 should be used in preference to USEPA RSLs to evaluate chemical concentrations in environmental media at California sites and facilities. USEPA RSLS should continue to be used for contaminants for which a DTSC-SL value in Note 3 is not available. Note that the DTSC-SLs are derived at a target risk level of 1×10-6 (one in one million) and a target hazard quotient value of 1. In addition, specific recommendations for several contaminants are discussed. Alternatively, in consultation with HERO, the USEPA online screening calculator can be used to calculate site-specific values using the more protective of Cal/EPA and USEPA toxicity criteria and applying assumptions consistent with HERO recommendations (e.g., route-to-route extrapolation between the oral and inhalation exposure pathways for inhalation toxicity criteria; and California-specific exposure factors).

HERO’s development of DTSC-SLs for air (Table 3) included route extrapolation for chemicals lacking an inhalation toxicity value but which are identified as volatile by the USEPA RSL methodologyd, or by DTSC’s vapor intrusion guidance. The Toxicity F
Criteria Rule and the USEPA Superfund hierarchy of toxicity-criteria sources provides oral toxicity criteria for more chemicals than California agency sources. Consequently, for volatile compounds without inhalation toxicity criteria, most extrapolations to derive DTSC-SLs for air are based on the USEPA oral toxicity criteria. Details on toxicity criteria references are provided in HHRA Note 10.e
WHAT’S NEW (June 2020)
• As a continuation of previous iterations of HHRA Note 3, HERO has reviewed the May and November 2019 RSL table updates (see USEPA’s “What’s New” b See HHRA Note 10, available at: https://dtsc.ca.gov/human-health-risk-hero/ c https://dtsc.ca.gov/human-health-risk-hero/
d In the June 2015 releases of the RSL tables, USEPA included a vapor pressure greater than 1 millimeter of mercury as a defining characteristic of volatile compounds in addition to the long-standing criterion of a Henry’s law constant greater than 1×10-5 (one in one hundred thousand) (atmosphere-cubic meter) per mole. e https://dtsc.ca.gov/human-health-risk-hero/

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

webpagef), as well as other relevant information, including the Toxicity Criteria Rule and other updated Cal/EPA criteria. This revised HHRA Note 3 incorporates our updated recommendations for screening levels, current as of February 2020.
• Changes from the April 2019 HHRA Note 3 include:
o There are new analytes in the USEPA RSL tables resulting in new DTSC-SLs for endosulfan sulfate, styrene-acrylonitrile (SAN) Trimer (THNP isomer), and weathered toxaphene. Additional new analytes include 2-ethyl-1-hexanol, tert-butyl acetate, and several lanthanum compounds, but the USEPA RSL tables should be used for these analytes.
o DTSC-SL analytes in soil: new values for p,a,a,a-tetrachlorotoluene and thiophanate-methyl result from changes in toxicity criteria, and slightly changed values for Aroclor 1016 and Aroclor 5460 result from changes in USEPA’s chemical-parameter values. Soil DTSC-SL values are dropped for arsine, cyanogen, cyanogen bromide, cyanogen chloride, tetryl, thallium acetate, thallium carbonate, and thiocyanic acid because of a change in the number of significant digits in computational comparisons. o DTSC-SL analytes in tap water: new values for p,a,a,a-tetrachlorotoluene and thiophanate-methyl result from changes in toxicity criteria. o DTSC-SL analytes in ambient air: new values for
p,a,a,a-tetrachlorotoluene result from changes in toxicity criteria. • As a reminder, chemicals are listed in alpha-numeric order to eliminate complexities in tabular formatting. HERO recommends the use of CAS numbers to avoid problems with nomenclature and synonyms.

HERO ISSUE CONTACT PERSON:

Edward A. Fendick, Ph.D.

Staff Toxicologist
VOICE (direct): 916.255.6555
EMAIL: [email protected]
f https://www.epa.gov/risk/regional-screening-levels-rsls-whats-new

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

BACKGROUND
HERO has a long history of working with the USEPA Region 9 office to integrate California-specific risk assessment concerns into the Preliminary Remediation Goal (PRG) listing and the PRG-screening risk assessment process. One example of the collaboration was the inclusion of ‘Cal-modified’ values into the USEPA Region 9 PRG list from 2004. In 2008, USEPA released a single set of RSL tables for national use and which replaced the USEPA Region 9 PRGs (and eliminated Cal-modified values).

Since then, new USEPA RSLs have been released on a semiannual basis (Spring and Fall) and have included substantial modifications to the RSL methodology and toxicity value updates. Specific details of changes in the USEPA RSL methodology are documented in the “What’s New” webpage section of the USEPA website. 2F2Fg HERO continues the ongoing process of reviewing new values and methodologies, and their application in screening risk assessment. HERO generally has incorporated the USEPA RSL methodological changes, except as noted later in this text. For example, the dermal exposure pathway has been incorporated into the tap water RSL calculation.

There now are 829 elements, compounds and mixtures listed in the RSL tables.

A DTSC-SL value is derived for at least one combination of medium, receptor, and endpoint for 568 unique elements, compounds, and mixtures in this iteration of HHRA Note 3.

USES OF RSLs and DTSC-SLs
Section 3.0 of the USEPA RSL Users Guide3F3Fh lists the following uses for the RSLs:
“These concentrations can be used for:
• Prioritizing multiple sites or operable units or areas of concern within a facility or exposure units
• Setting risk-based detection limits for contaminants of potential concern (COPCs) • Focusing future site investigation and risk assessment efforts (e.g., selecting COPCs for the baseline risk assessment)
• Identifying contamination which may warrant cleanup
• Identifying sites, or portions of sites, which warrant no further action or investigation
• Initial cleanup goals when site-specific data are lacking” g https://www.epa.gov/risk/regional-screening-levels-rsls-whats-new h https://www.epa.gov/risk/regional-screening-levels-rsls-users-guide

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

RSLs are NOT to be used to perform a human health Baseline Risk Assessment (BRA), but to assist in the tasks preceding a human health BRA.

In the past, the USEPA Region 9 PRGs had been used by HERO primarily at open, closing, and formerly-used Department of Defense (DoD) sites. Screening risk assessments at some non-military sites have in the past used different processes.

However, the DTSC-SLs included in this report are being used, and are intended for use, at any DTSC site.

HHRA Note Number 44F4Fi and the Preliminary Endangerment Assessment (PEA) Guidance Manualj provide the most recent guidance for use of screening levels in risk assessments. In general, HERO recommends compliance with the basic approach and principles outlined in Note 4. This includes the provision that DTSC-SLs and USEPA RSLs are used for screening sites as a whole, not for “screening out” individual chemicals. Ratios of the concentration of a particular chemical in a medium (e.g., soil, water, or air) to its risk-based concentration are calculated and the ratio is summed across all chemicals and media to estimate a total risk and hazard for the site. Prior to making risk management decisions based on the results of such an evaluation, it is critical that limitations associated with the use of DTSC-SLs and USEPA RSLs be carefully noted and understood. For example, the derivation of the DTSC-SLs and USEPA RSLs did not include an evaluation of the intrusion of vapors from the subsurface to indoor air (see below for a more detailed discussion of exposure pathways). The intrusion of volatile compounds from soil or groundwater to indoor air is a potentially major exposure pathway and should be evaluated. Ecological receptors were not considered in the derivation of DTSC-SLs and USEPA RSLs. The DTSC-SLs and USEPA RSLs apply only to human receptor exposure scenarios and are NOT necessarily protective of ecological receptors. The need for an ecological risk assessment should be evaluated separately.

CONCEPTUAL SITE MODEL AND INCLUDED EXPOSURE PATHWAYS
Before conducting a screening level human health risk assessment, development of a site-specific conceptual site model (CSM) or site exposure model is critical to ensure all appropriate receptors and exposure pathways are addressed by the chosen screening levels.

The risk-based residential and industrial soil screening levels consider several exposure pathways (ingestion, inhalation of particles and volatile chemicals, and dermal absorption) from each of three environmental media (soil, tap water, and air). i https://dtsc.ca.gov/human-health-risk-hero/
j https://dtsc.ca.gov/wp-content/uploads/sites/31/2018/01/PEA_Guidance_Manual.pdf

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

The tap water screening levels are based on assumed domestic use of water via ingestion from drinking, inhalation of volatile chemicals generated during household use (e.g., showering, dish washing), and dermal exposure.

Although the soil and tap water screening levels account for many typical exposure pathways, they do not account for the following potential exposure pathways (for example, as discussed in the RSL User’s Guide5F5Fk):
• The residential and industrial soil RSLs do not account for exposure to indoor air vapors due to intrusion of subsurface soil gas emissions; ingestion via uptake of plants (home-grown fruits and vegetables), meat, or dairy products; or inhalation of particles (fugitive dust) generated by activities which elevate particulate emissions such as truck traffic and use of heavy equipment. • Pathways not considered in the calculation of the tap water RSLs include subsurface vapor intrusion to indoor air from volatile compounds present in groundwater and transfer of contaminants in surface water or groundwater to aquatic organisms or terrestrial plants with subsequent ingestion by humans.

The RSL on-line calculator and User’s Guide do however include equations which can be used to calculate screening-level concentrations in fish assuming human consumption of fish. These equations do not address impacts to fish; but rather, human consumption of fish which may be contaminated. The RSL on-line calculator and User’s Guide also provide equations which can be used to evaluate recreational receptor exposures to soil/sediment and surface water.

If pathways excluded from the derivation of the soil and tap water screening levels are anticipated at the site (e.g., home-grown produce consumption or excessive dust generation), an RSL- or DTSC-SL-based screening level risk evaluation may significantly underestimate risk. In addition, if there are exposure scenarios other than residential and industrial land use, a screening level risk evaluation using RSLs or DTSC-SLs may not be appropriate (e.g., sites in which trench workers may be exposed to shallow groundwater). In such cases, the evaluation of risk to human receptors at the site could proceed directly to the baseline human health risk assessment process. In other instances, the screening risk assessment may overestimate risk but, in these cases, a baseline human health risk assessment will likely be necessary for site-specific risk-management decisions. For reference, HERO has compiled a summary of recommended exposure factors which may be used as default values in baseline human health risk assessments for California hazardous waste sites and permitted facilities, DTSC HHRA Note 1, which is mostly consistent with the recent changes to the USEPA RSL methodology.
k https://www.epa.gov/risk/regional-screening-levels-rsls-users-guide

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Additional Considerations Regarding Exposure for the Industrial Scenario Evaluations of the industrial scenario using only the soil screening levels do not account for the following pathways: all exposures to groundwater (e.g., consumption as drinking water, vapor intrusion from ground water, or dermal contact); exposure via vapor intrusion to indoor air; exposure to contaminated surface water, and inhalation of particulates generated by activities which increase particulate levels such as truck traffic and use of heavy equipment. If these exposure pathways are significant at a site, screening risk assessment using soil screening levels is generally insufficient. In some cases, it may be possible, with the cooperation of the DTSC toxicologist, to incorporate the risk from the vapor intrusion pathway into the screening risk assessment by adding the risk from this pathway into the risk estimated from the use of the soil screening levels.

The tap water RSLs and DTSC-SLs are calculated using residential land use assumptions. As such, these screening levels are not reflective of potential industrial exposures and may over- or underestimate exposures via the water pathways (e.g., ingestion and dermal exposures to contaminated water, and inhalation exposure to volatile contaminants emitted into workplace air from contaminated water).

METHODOLOGY FOR THE DTSC-SLs
The process for derivation of DTSC-SLs is based on the identical computational algorithms used to derive USEPA’s RSLs. To validate the process, a series of spreadsheet worksheets were populated with the RSL algorithms, USEPA exposureparameter values, USEPA toxicity criteria, and the RSL analyte roster. Values derived in these workbooks were compared to the USEPA values downloaded from the USEPA website. Computed values matched the USEPA values for soil, tap water, and air after allowing for slight differences attributable to treatment of significant digits and rounding.

DTSC-SLs were derived by populating copies of the aforementioned spreadsheet workbooks with toxicity criteria consistent with the Toxicity Criteria Rule, and with California exposure factors and DTSC-specific methods. California exposure factors are those listed in HHRA Note 1 or the PEA Guidance Manual, and many values match those used by USEPA. Toxicity criteria were obtained based on the Toxicity Criteria Rule, as described next.

Toxicity Criteria Rule
On 4 September 2018, the Toxicity Criteria for Human Health Risk Assessments, Screening Levels, and Remediation Goals rule (“Toxicity Criteria Rule”) was approved by the State of California Office of Administrative Law and became effective immediately.l The Rule requires human health risk assessments, risk-based screening l https://dtsc.ca.gov/regs/toxicity-criteria-for-human-health-risk-assessment/

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

levels, and remediation goals prepared pursuant to the Hazardous Substances Account Act (Health and Safety Code [HSC] §25300 et seq., “Chapter 6.8”) to be based on toxicity criteria from a specified hierarchy of sources. The Toxicity Criteria Rule’s Section (§) 69021 provides the hierarchy:
1) §69021(a) - toxicity criteria for a given contaminant listed in Appendix I Tables A and B of the Rule (“promulgated criteria”);
2) §69021(b) - toxicity criteria for contaminants that are not listed in the Rule’s Appendix I but are listed in the current USEPA Integrated Risk Information System (IRIS) database (“promulgated criteria”); and
3) §69021(c) - toxicity values for a given contaminant from “other sources” including but not limited to: the Office of Environmental Health Hazard Assessment (OEHHA) toxicity values that are not listed in the Rule’s Appendix I, USEPA Provisional Peer Reviewed Toxicity Values (PPRTVs), Agency for Toxic Substances and Disease Registry (ATSDR) Minimal Risk Levels (MRLs), USEPA PPRTV Appendix Screening Toxicity Values, USEPA Superfund Health Effects Assessment Summary Table (HEAST) values, and other additional sources (“recommended criteria”). The use of the toxicity criteria under §69021(c) requires approval from the HERO Supervising Toxicologist prior to use.

HHRA Note 10 provides additional detail on the application of the Toxicity Criteria Rule in human-health risk assessments, and in derivation of screening levels and remedial goals. Notably regarding HHRA Note 3, Table 1 of HHRA Note 10 provides the recommended, approved, toxicity criteria for the roster of analytes evaluated in the USEPA RSLs. The HHRA Note 10 Table 1 values are incorporated into HHRA Note 3’s derivation of the DTSC-SLs.

In consideration of evolving methods for mutagenic carcinogens and interagency consistency, calculations for compounds identified as having a mutagenic mode of action (MMOA) utilized age-dependent adjustment factors (ADAFs) in accordance with the methods employed by the USEPA in their RSL tables. Trichloroethene (TCE) was evaluated using the combined MMOA and non-mutagen approaches as developed in the USEPA RSL methodology. Vinyl chloride was evaluated using the same vinylchloride-specific methodology used in the USEPA RSL tables, although the vinyl chloride methodology may be under review. Lastly and as discussed previously, for purposes of screening air contaminants, HERO recommends the use of route extrapolation—converting an oral reference dose or slope factor to an inhalation reference concentration or unit-risk factor—when an inhalation-specific toxicity value is not available.

DTSC-SLs were calculated for the entire roster of RSL analytes and several additional analytes. The final roster of soil and tap water DTSC-SLs are provided in Tables 1 and 2, respectively; air screening levels are listed in Table 3.

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

SITE SCREENING – SOIL, TAP WATER, and AIR CONTAMINANTS
As discussed previously, HERO reviewed the soil, tap water, and air RSLs in a phased approach. The results presented in this version provide recommendations on the use of screening levels for soil, tap water, and air, under residential and industrial/commercial land uses.

Since May 2013, USEPA has provided two sets of tables with RSLs based on target hazard quotients (THQ) of 1.0 and 0.1. The rationale for using a THQ of 0.1 for screening is that if 10 chemicals were at a site and all narrowly passed a screening at THQ=1.0, the resulting total HI could be 10. In general, HERO does not recommend use of screening levels based on a THQ of 0.1. Instead, screening levels based on a target HQ of 1 should be used, and cumulative noncancer hazard should be summed across all site-related contaminants, media, and exposure pathways. As of November 2017, the RSL calculator website now includes user-selectable options for the target risk and the target hazard quotient. The DTSC-SLs are derived at a target risk level of 1×10-6 (one in one million) and a target hazard quotient value of 1. All discussion below relies on a target risk of 1×10-6 (one in one million) or a target hazard quotient of

1. Soil and Tap Water
While it is possible to use the USEPA website’s on-line RSL calculator9F9Fm and employ the California-recommended toxicity criteria and exposure factors for each exposure pathway to derive screening levels, this would be a laborious process for DTSC managers and staff, Responsible Parties, and contractors. To address this difficulty, HERO has combined the USEPA RSL methodology and values with a DTSC-specific methodology and values for all compounds in the USEPA RSL roster. HERO then identified elements, compounds, and mixtures in which the soil, tap water, or ambient air DTSC-SL value was less (more stringent) than the corresponding USEPA RSL value.

Users of the screening levels should be aware that the values are strictly risk-based computed concentrations. The DTSC-SLs and the tabular versions of the USEPA RSL tables do not consider external practical criteria such as analytical detection limits, naturally occurring concentrations, or physical limitations such as soil saturation (although relevant notations are provided in the USEPA RSL tables). For example, screening levels for some chemicals can exceed liquid saturation conditions (i.e., pure analyte in the soil pore space) or can exceed reasonable physical conditions in soil such as concentrations greater than 100,000 ppm (10% by weight or more). Multiple DTSC-SLs exceeded soil-saturation concentrations (particularly volatile organic compounds) or a 10% by weight threshold, so screening-level results should be m http://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

carefully reviewed. Note that the online USEPA RSL calculator has a user-selectable site-specific option to substitute saturation or threshold concentrations when the calculated RSL exceeds those physical limitations. For tap water, risk-based concentrations occasionally exceed maximum contaminant level (MCL) regulatory criteria; see item #5 in the subsequent “Discussion and Recommendations for Specific Contaminants” section.

Lastly, if volatile contaminants are present at a site, soil gas data are required to evaluate the vapor intrusion to indoor air pathway. This allows a more comprehensive evaluation because the soil and tap water screening levels do not include the vapor intrusion pathway, which is often the risk driver.

Air
Subsurface vapor intrusion to indoor air from volatile compounds in soil or groundwater is a potentially major exposure pathway. The air screening levels address residential and commercial/industrial exposure scenarios and may be used for screening contaminants in indoor air. The air screening levels for volatile chemicals also have potential applications for screening soil gas data when used in concert with an appropriate attenuation factor as described in DTSC’s 2011 Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (2011 VIG). DTSCrecommended default attenuation factors for preliminary screening evaluations can be found in Table 2 of DTSC’s 2011 VIG. DTSC also recommends that screening assessments evaluate the default attenuation factors of 0.03 for sub-slab soil gas and “near-source” exterior soil gas, released in 2015 by USEPA.n For detailed recommendations on the vapor intrusion to indoor air pathway and evaluation of soil gas and indoor air data, please consult DTSC’s 2011 VIG, or contact the DTSC site toxicologist to ensure appropriate use of air screening levels on a site-specific basis. • To facilitate site screening, HERO herein provides recommendations on use of air screening levels for chemicals identified as volatile in the USEPA RSL tables or DTSC’s VIG, and non-volatile compounds with inhalation-based toxicity criteria (no route extrapolation). HERO’s derivation is based on a comparison of the inhalation toxicity criteria used to derive the USEPA’s air RSLs relative to California toxicity criteria and HERO recommendations (e.g., route-to-route extrapolation for volatile chemicals). As noted previously, screening levels for air contaminants are the more stringent of USEPA or DTSC screening values. n https://www.epa.gov/sites/production/files/2015-09/documents/oswer-vapor-intrusiontechnical-guide-final.pdf

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

• For the 111 volatile chemicals that lacked inhalation toxicity criteria, HERO extrapolated oral-exposure toxicity criteria to derive inhalation toxicity criteria for use in calculating air screening levels (see HHRA Note 10).

DISCUSSION AND RECOMMENDATIONS FOR SPECIFIC CONTAMINANTS Lead (Soil)
In 2007, Cal/EPA OEHHA developed a new toxicity evaluation of lead, replacing the 10 micrograms per deciliter (µg/dL) threshold blood lead concentration with a sourcespecific “benchmark change” of 1 µg/dL.11F11Fo One µg/dL is the estimated incremental increase in children’s blood lead that would reduce Intelligence Quotient (IQ) by up to 1 point. Considering the updated Cal/EPA lead toxicity criterion, as well as the need for revision to ensure that the model is adequately protective of women of child-bearing age, HERO developed a new version of the DTSC LEAD RISK ASSESSMENT SPREADSHEET (LeadSpread 8; 2011).12F12Fp
Worksheets 1 and 2 of the LeadSpread 8 file include PRG90 calculations for residential and industrial land use scenarios, respectively. The PRG90 values represent lead concentrations in soil that will result in a 90th percentile estimate of a 1µg/dl increase in blood lead in a child or the fetus of a pregnant adult worker. While DTSC has historically used the 99th percentile estimate of blood lead concentration in the population, HERO considers the 90th percentile of the distribution appropriate for use in evaluating lead exposures with the new health-protective criterion of a 1 µg/dL incremental increase in blood lead. The previous benchmark targeted the total blood lead concentration, which also included contributions of lead from background sources.

HERO applies the risk-based soil lead concentrations in a residential use (i.e., unrestricted use) scenario as an Exposure Point Concentration (EPC). A 95-percent upper confidence limit on the arithmetic mean (95% UCL) calculated to be 80 mg/kg or less for residential soil lead, or a 95% UCL of 320 mg/kg or less for industrial soil lead, would be protective of children and women of child-bearing ages, respectively. With regard to assessment of lead risk and evaluating cleanup options, if sufficient data are available, HERO recommends calculating the 95% UCL lead concentration for each exposure area. If individual samples exceed the PRG90 soil lead concentration, the exposure area as a whole might not exceed the PRG90 as long as the 95% UCL itself is below ~80 mg/kg for residential and ~320 mg/kg for industrial/commercial, and assuming hot spots are not present. If “hot spots” (i.e., geographically collocated areas o http://oehha.ca.gov/media/downloads/crnr/pbhgv041307.pdf p https://dtsc.ca.gov/leadspread-8/

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

of elevated concentration), or “outliers” (i.e., individual samples with elevated concentrations) are present, they must be addressed separately.

For initial site screening where data are insufficient to calculate a 95% UCL, comparison of the maximum detected concentration to the PRG90s would be appropriate. If individual sample results exceed the PRG90s, depending on site-specific conditions and sampling results, additional investigation, evaluation, and potentially remediation may be warranted to address concerns about lead exposure.

It is important to note that background exposures to lead, and media other than soil which may be impacted by lead are not considered in LeadSpread8. If lead is present at levels above background in media other than soil (e.g., water, air), or if the home grown produce pathway is anticipated at the site, please contact the HERO toxicologist.

DTSC’s LeadSpread model is periodically updated; users should check the DTSC website for the latest version.13F13Fq
Cadmium (Soil)
The cadmium soil and tap water RSLs based on noncancer effects were calculated using the USEPA Integrated Risk Information System (IRIS) oral reference dose (RfDo) for food (1 µg/kg-day) and water (0.5 µg/kg-day), respectively. Previous versions of HHRA Note 3 utilized alternative toxicity criteria to derive DTSC-SLs; noncancer screening levels for soil, compliant with the Toxicity Criteria Rule, are now derived to be the USEPA RSL (71 mg/kg) for residential soil and a DTSC-SL of 780 mg/kg for commercial/industrial soil.

Please note that the DTSC-modified soil screening levels presented herein are undergoing re-evaluation. Based on newer data and potential updates to cadmium toxicity criteria, HERO’s review of relevant information for this contaminant is ongoing and we plan to derive updated DTSC-modified screening levels for soil in the future. At this time, we have not derived tap water screening levels for cadmium, however, we may do so as part of a future revision. Please consult with the DTSC toxicologist for sites where cadmium is a site-related contaminant in soil or water to ensure an up-to date analysis for site conditions.
­
Beryllium and Beryllium Compounds (Soil).

Cal/EPA toxicity criteria for beryllium differ from current USEPA values. For cancer, there are no oral slope factors from either USEPA or Cal/EPA sources, while the USEPA and Cal/EPA’s inhalation unit risks (IURs) for beryllium and beryllium oxide are the same. Cal/EPA also has a separate IUR for beryllium sulfate (8.6E-1 per µg/m 3), but the Toxicity Criteria Rule requires use of the IRIS IUR for beryllium and q http://www.dtsc.ca.gov/assessingrisk/humanrisk2.cfm

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

compounds (2.4E-3 per µg/m3). For noncancer, the USEPA RfDo (2E-3 mg/kg-day) is 10-fold higher than the noncancer toxicity criterion used by Cal/EPA OEHHA to derive the PHG for beryllium and beryllium compounds (2E-4 mg/kg-day). The difference is based on agency differences in dose metrics and uncertainty adjustments applied to the same underlying primary research. In addition, the USEPA inhalation reference concentration (RfC) for beryllium and compounds (2E-2 µg/m3) is higher than the OEHHA chronic inhalation reference level (REL) for beryllium and compounds (7E-3 µg/m3) because OEHHA weighted the key study’s critical effect as more severe than USEPA did for the same study. Based on the Toxicity Criteria Rule, the OEHHA PHG, OEHHA REL, and IRIS IUR must be used in derivation of the screening levels (although the OEHHA IUR is identical in value to the IRIS IUR, the OEHHA IUR is not specified in the Toxicity Criteria Rule which then defaults to IRIS).

For beryllium and compounds, HERO applied the IRIS IUR (2.4E-3 per µg/m3), the RfDo-equivalent from the PHG document (2E-4 mg/kg-day), the chronic REL (7E-3 µg/m3), and DTSC default dermal exposure parameters (including GIABS=1) to derive DTSC-modified screening levels for soil. The DTSC-modified screening levels based on noncancer effects were calculated to be 16 mg/kg and 230 mg/kg for residential and industrial land use, respectively. For cancer, the DTSC-modified screening levels for beryllium and compounds in soil were calculated to be 1600 mg/kg and 6900 mg/kg under the residential and industrial land use scenarios, respectively, concentrations identical to the USEPA RSL derivation.

For beryllium sulfate, HERO previously applied the Cal/EPA inhalation unit risk (8.6E-1 per µg/m3) for cancer to derive DTSC-modified screening levels for soil of

4.4 mg/kg and 19 mg/kg for residential and industrial land uses, respectively. However, with adoption of the Toxicity Criteria Rule, the computations now use the IRIS inhalation unit risk (2.4E-3 per µg/m3) for cancer to derive screening levels for soil of 1600 mg/kg and 6,900 mg/kg, which is equivalent to the USEPA RSL values. For noncancer endpoints, the DTSC-SL and USEPA RSL for beryllium sulfate and beryllium and compounds in soil are identical. Like cadmium above, at this time we have not derived tap water screening levels for beryllium sulfate. Please consult with the DTSC toxicologist for sites where beryllium is a site-related contaminant in water.

Arsenic (Soil)
USEPA incorporates a relative bioavailability factor (RBA) into the RSL calculations for screening level concentrations for ingestion of soil-borne arsenic (a dimensionless value of 0.6, in contrast to a default value of 1.0 for all other compounds). HERO supports the use of this default RBA value for the adjustment of the ingestion of arsenic bound to soils and the DTSC-SL reflects this modification to the risk calculation. HERO has prepared HHRA Note 6 that provides recommendations for completing site-specific

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

evaluations of the arsenic RBA in site soils.r Please consult with the DTSC toxicologist for sites where soil-borne arsenic is a site-related contaminant for the current recommendations for arsenic bioavailability. Note that risk-based screening-level concentrations of arsenic in soil are often below naturally occurring (background) concentrations. Consequently, HERO strongly recommends consideration of sitespecific background concentrations of inorganic constituents.

Screening Levels and MCLs.

As noted previously, the DTSC-SL and USEPA RSL values are derived strictly as riskbased concentrations—mathematical constructs of the exposure calculation algorithms—that may be independent of certain practical constraints (e.g., solubility, detection limits, or background concentrations). Additionally, there may be risk management considerations (such as regulatory thresholds) that affect decision-making for contaminated sites outside of the risk assessment process. Maximum Contaminant Levels (MCLs) are enforceable regulatory criteria for protection of the drinking water resource and in several examples, are at concentrations lower than risk-based screening levels. Table 4 presents the roster of analytes for which a DTSC-SL or USEPA RSL screening value exceeds an MCL regulatory criterion. These MCL criteria may need additional consideration during scoping for remedial or environmental investigations.

TABULAR RESULTS
HERO has calculated soil and tap water DTSC-SLs for all chemicals on the USEPA RSL roster and several additional analytes. The tabular results list the DTSC-SLs when the DTSC-SL is more stringent than the corresponding USEPA RSL; USEPA RSL values are also provided for completeness for the other combinations of receptor and endpoint when the USEPA RSL was more stringent. Screening concentrations for air were derived for all of the volatile chemicals and several other airborne contaminants, and a DTSC-SL is listed when the value is more stringent than the corresponding USEPA RSL value.

Alternatively, the USEPA on-line screening calculator available at the USEPA RSL website14Fs can be used to calculate site-specific values using the more protective of Cal/EPA or USEPA toxicity criteria, applying assumptions consistent with HERO recommendations (e.g., route-to-route extrapolation between the oral and inhalation exposure pathways where no toxicity value is available for the inhalation route of exposure but an oral toxicity value is available), and site-specific values as agreed upon in consultation with HERO.
r https://www.dtsc.ca.gov/AssessingRisk/humanrisk2.cfm
s https://epa-prgs.ornl.gov/cgi-bin/chemicals/csl_search

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Screening Levels for Soil (Table 1)
Table 1 presents DTSC-modified screening values for soil that are more stringent than the corresponding USEPA value. For this roster of analytes (i.e., with at least one DTSC-SL), available USEPA RSL values are also provided for receptors or endpoints that lack a designated DTSC-SL, for table completeness. A Microsoft Excel® version of Table 1 is available for download from the DTSC website.

Screening Levels for Tap Water (Table 2)
Table 2 presents DTSC-modified screening values for tap water that are more stringent than the corresponding USEPA value. For this roster of analytes (i.e., with at least one DTSC-SL), available USEPA RSL values are also provided for receptors or endpoints that lack a designated DTSC-SL, for table completeness. A Microsoft Excel® version of Table 2 is available for download from the DTSC website.

Screening Levels for Air (Table 3)
Table 3 presents DTSC-modified screening values for air contaminants that are more stringent than the corresponding USEPA RSL value. For this roster of analytes (i.e., with at least one DTSC-SL), available USEPA RSL values are also provided for receptors or endpoints that lack a designated DTSC-SL, for table completeness. A Microsoft Excel® version of Table 3 is available for download from the DTSC website.

Maximum Contaminant Levels (MCLs) (Table 4)
Table 4 presents the roster of analytes for which a DTSC-SL or USEPA RSL exceeds an MCL regulatory criterion. A Microsoft Excel® version of Table 4 is available for download from the DTSC website.

Supporting Documentation
Supporting documentation of the computations for the DTSC-SLs can be provided upon request (see the HERO Issue Contact information earlier in this Note). These documentation files provide the exposure factors, exposure algorithms, toxicity criteria, and computed screening-level concentrations for soil, tap water, and air, for exposures via ingestion, dermal contact, and inhalation.

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Table 1: HHRA Note 3, June 2020, DTSC-recommended Screening Levels for Soil Analytes Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
1,1,1,2-Tetrachloroethane 630-20-6 2 USEPA RSL 550 DTSC-SL 8.8 USEPA RSL 2700 DTSC-SL 1,1,1-Trichloroethane 71-55-6 -- -- 1700 DTSC-SL -- -- 7200 DTSC-SL 1,1,2,2-Tetrachloroethane 79-34-5 0.6 USEPA RSL 700 DTSC-SL 2.7 USEPA RSL 4300 DTSC-SL 1,1,2-Trichloropropane 598-77-6 -- -- 170 DTSC-SL -- -- 1100 DTSC-SL 1,1-Dichloroethane 75-34-3 3.6 USEPA RSL 1600 DTSC-SL 16 USEPA RSL 7100 DTSC-SL 1,1-Dichloroethene 75-35-4 -- -- 83 DTSC-SL -- -- 350 DTSC-SL 1,2,3-Trichlorobenzene 87-61-6 -- -- 40 DTSC-SL -- -- 300 DTSC-SL 1,2,3-Trichloropropane 96-18-4 0.0015 DTSC-SL 4.8 USEPA RSL 0.021 DTSC-SL 21 USEPA RSL 1,2,4,5-Tetrachlorobenzene 95-94-3 -- -- 17 DTSC-SL -- -- 150 DTSC-SL 1,2,4-Tribromobenzene 615-54-3 -- -- 280 DTSC-SL -- -- 2500 DTSC-SL 1,2,4-Trichlorobenzene 120-82-1 7.8 DTSC-SL 58 USEPA RSL 35 DTSC-SL 260 USEPA RSL 1,2-Dibromo-3-chloropropane 96-12-8 0.0043 DTSC-SL 4.7 USEPA RSL 0.057 DTSC-SL 25 USEPA RSL 1,2-Dinitrobenzene 528-29-0 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 1,2-Diphenylhydrazine 122-66-7 0.68 USEPA RSL -- -- 1.9 DTSC-SL -- -- 1,2-Phenylenediamine 95-54-5 4.5 USEPA RSL 250 USEPA RSL 12 DTSC-SL 2100 DTSC-SL 1,3,5-Trinitrobenzene 99-35-4 -- -- 2200 USEPA RSL -- -- 29000 DTSC-SL 1,3-Butadiene 106-99-0 0.014 DTSC-SL 1.8 USEPA RSL 0.062 DTSC-SL 7.6 USEPA RSL 1,3-Dibromobenzene 108-36-1 -- -- 16 DTSC-SL -- -- 100 DTSC-SL 1,3-Dichloropropane 142-28-9 -- -- 410 DTSC-SL -- -- 2200 DTSC-SL 1,3-Dinitrobenzene 99-65-0 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 1,3-Phenylenediamine 108-45-2 -- -- 380 USEPA RSL -- -- 3200 DTSC-SL 1,4-Benzenediamine-2-methyl sulfate 6369-59-1 5.4 USEPA RSL 19 USEPA RSL 15 DTSC-SL 160 DTSC-SL 1,4-Dibromobenzene 106-37-6 -- -- 420 DTSC-SL -- -- 2900 DTSC-SL 1,4-Dinitrobenzene 100-25-4 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 1,4-Dithiane 505-29-3 -- -- 550 DTSC-SL -- -- 4700 DTSC-SL 1,4-Phenylenediamine 106-50-3 -- -- 63 USEPA RSL -- -- 530 DTSC-SL 1-Bromo-3-fluorobenzene 1073-06-9 -- -- 8.8 DTSC-SL -- -- 50 DTSC-SL 1-Bromo-4-fluorobenzene 460-00-4 -- -- 8.9 DTSC-SL -- -- 51 DTSC-SL 1-Chlorobutane 109-69-3 -- -- 270 DTSC-SL -- -- 1200 DTSC-SL 1-Methylnaphthalene 90-12-0 9.9 DTSC-SL 3400 DTSC-SL 30 DTSC-SL 22000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
2-(2-methoxyethoxy)-Ethanol 111-77-3 -- -- 2500 USEPA RSL -- -- 21000 DTSC-SL 2,2',3,3',4,4',5,5',6,6'-
Decabromodiphenyl ether
1163-19-5 780 USEPA RSL 440 USEPA RSL 2100 DTSC-SL 3700 DTSC-SL 2,2',4,4',5,5'-Hexabromodiphenyl
ether
68631-49-2 -- -- 13 USEPA RSL -- -- 110 DTSC-SL
2,2',4,4',5-Pentabromodiphenyl ether 60348-60-9 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 2,2',4,4'-Tetrabromodiphenyl ether 5436-43-1 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 2,3,4,6-Tetrachlorophenol 58-90-2 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL 2,3,7,8-Tetrachlorodibenzo-p-dioxin 1746-01-6 0.0000048 USEPA RSL 0.000051 USEPA RSL 0.000018 DTSC-SL 0.0006 DTSC-SL 2,3-Dichloropropanol 616-23-9 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL 2,4,4-Trimethylpentene 25167-70-8 -- -- 40 DTSC-SL -- -- 170 DTSC-SL 2,4,5-Trichlorophenol 95-95-4 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL 2,4,5-Trichlorophenoxyacetic acid 93-76-5 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL 2,4,6-Tribromophenol 118-79-6 -- -- 570 USEPA RSL -- -- 4800 DTSC-SL 2,4,6-Trichloroaniline 634-93-5 78 USEPA RSL 1.9 USEPA RSL 210 DTSC-SL 16 DTSC-SL 2,4,6-Trichloroaniline hydrochloride 33663-50-2 19 USEPA RSL -- -- 51 DTSC-SL -- -- 2,4,6-Trichlorophenol 88-06-2 7.8 DTSC-SL 63 USEPA RSL 21 DTSC-SL 530 DTSC-SL 2,4,6-Trinitrotoluene 118-96-7 21 USEPA RSL 36 USEPA RSL 79 DTSC-SL 420 DTSC-SL 2,4/2,6-Dinitrotoluenes E1615210 0.8 USEPA RSL 57 DTSC-SL 2.2 DTSC-SL 480 DTSC-SL 2,4-Dichlorophenol 120-83-2 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL 2,4-Dichlorophenoxyacetic acid 94-75-7 -- -- 700 USEPA RSL -- -- 7300 DTSC-SL 2,4-Dichlorophenoxybutyric acid 94-82-6 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL 2,4-Dimethylaniline 95-68-1 2.7 USEPA RSL 130 USEPA RSL 7.4 DTSC-SL 1100 DTSC-SL 2,4-Dimethylaniline hydrochloride 21436-96-4 0.94 USEPA RSL -- -- 2.6 DTSC-SL -- -- 2,4-Dimethylphenol 105-67-9 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL 2,4-Dinitrophenol 51-28-5 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL 2,4-Dinitrotoluene 121-14-2 1.7 USEPA RSL 130 USEPA RSL 4.7 DTSC-SL 1000 DTSC-SL 2,6-Dimethylphenol 576-26-1 -- -- 38 USEPA RSL -- -- 320 DTSC-SL 2,6-Dinitrotoluene 606-20-2 0.36 USEPA RSL 19 USEPA RSL 0.99 DTSC-SL 160 DTSC-SL 2-Acetylaminofluorene 53-96-3 0.14 USEPA RSL -- -- 0.39 DTSC-SL -- -- 2-Amino-4,6-dinitrotoluene 35572-78-2 -- -- 150 USEPA RSL -- -- 2200 DTSC-SL 2-Butoxyethanol 111-76-2 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL 2-Chloroethanol 107-07-3 -- -- 1300 DTSC-SL -- -- 13000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
2-chloroethyl 2-[4-(1,1-
dimethylethyl)phenoxy]-1-methylethyl
ester Sulfite
140-57-8 22 USEPA RSL 3200 USEPA RSL 59 DTSC-SL 26000 DTSC-SL 2-Chloronaphthalene 91-58-7 -- -- 4100 DTSC-SL -- -- 27000 DTSC-SL 2-Chloronitrobenzene 88-73-3 1.8 USEPA RSL 190 USEPA RSL 4.9 DTSC-SL 1500 DTSC-SL 2-Chlorophenol 95-57-8 -- -- 340 DTSC-SL -- -- 3900 DTSC-SL 2-Chlorotoluene 95-49-8 -- -- 470 DTSC-SL -- -- 2500 DTSC-SL 2-Mercaptobenzothiazole 149-30-4 49 USEPA RSL 250 USEPA RSL 130 DTSC-SL 2100 DTSC-SL 2-Methoxy-5-nitroaniline 99-59-2 11 USEPA RSL -- -- 30 DTSC-SL -- -- 2-Methyl-1,4-benzenediamine
dihydrochloride
615-45-2 -- -- 19 USEPA RSL -- -- 160 DTSC-SL
2-Methyl-5-nitroaniline 99-55-8 60 USEPA RSL 1300 USEPA RSL 160 DTSC-SL 11000 DTSC-SL 2-Methylaniline hydrochloride 636-21-5 4.2 USEPA RSL -- -- 11 DTSC-SL -- -- 2-Methylbenzene,1-4-diamine
monohydrochloride
74612-12-7 -- -- 13 USEPA RSL -- -- 110 DTSC-SL
2-Methylbenzene-1,4-diamine sulfate 615-50-9 5.4 USEPA RSL 19 USEPA RSL 15 DTSC-SL 160 DTSC-SL 2-Methylnaphthalene 91-57-6 -- -- 190 DTSC-SL -- -- 1300 DTSC-SL 2-Methylphenol 95-48-7 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL 2-Naphthylamine 91-59-8 0.3 USEPA RSL -- -- 0.82 DTSC-SL -- -- 2-Nitroaniline 88-74-4 -- -- 630 USEPA RSL -- -- 5200 DTSC-SL 2-Nitrotoluene 88-72-2 2.2 DTSC-SL 62 DTSC-SL 10 DTSC-SL 710 DTSC-SL 2-Phenylphenol 90-43-7 280 USEPA RSL -- -- 760 DTSC-SL -- -- 3,3'-Dichlorobenzidine 91-94-1 0.45 DTSC-SL -- -- 1.2 DTSC-SL -- -- 3,3'-Dimethoxybenzidine 119-90-4 0.34 USEPA RSL -- -- 0.93 DTSC-SL -- -- 3,3'-Dimethylbenzidine 119-93-7 0.049 USEPA RSL -- -- 0.13 DTSC-SL -- -- 3,4-Dimethylphenol 95-65-8 -- -- 63 USEPA RSL -- -- 530 DTSC-SL 3-Methylcholanthrene 56-49-5 0.0055 USEPA RSL -- -- 0.067 DTSC-SL -- -- 3-Methylphenol 108-39-4 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL 3-Nitrotoluene 99-08-1 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL 4-(2-Methyl-4-chlorophenoxy)butyric
acid
94-81-5 -- -- 280 USEPA RSL -- -- 2300 DTSC-SL
4,4'-DDD 72-54-8 2.3 USEPA RSL 1.9 USEPA RSL 6.2 DTSC-SL 16 DTSC-SL 4,4'-DDE 72-55-9 2 USEPA RSL 23 USEPA RSL 9.3 USEPA RSL 340 DTSC-SL 4,4'-DDT 50-29-3 1.9 USEPA RSL 37 USEPA RSL 7.1 DTSC-SL 430 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
4,4'-Dichlorobenzophenone 90-98-2 -- -- 570 USEPA RSL -- -- 4800 DTSC-SL 4,4'-Dichlorodiphenyl sulfone 80-07-9 -- -- 51 USEPA RSL -- -- 420 DTSC-SL 4,4'-Methylene bis(N,N'-
dimethyl)aniline
101-61-1 12 USEPA RSL -- -- 32 DTSC-SL -- --
4,4'-Methylene-bis(2-chloroaniline) 101-14-4 0.081 DTSC-SL 130 USEPA RSL 0.99 DTSC-SL 1100 DTSC-SL 4,4'-Methylenebisbenzeneamine 101-77-9 0.34 USEPA RSL 28000000 USEPA RSL 0.93 DTSC-SL 120000000 USEPA RSL 4,6-Dinitro-2-methylphenol 534-52-1 -- -- 5.1 USEPA RSL -- -- 42 DTSC-SL 4,6-Dinitro-o-cyclohexyl phenol 131-89-5 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL 4-Amino-2,6-dinitrotoluene 19406-51-0 -- -- 150 USEPA RSL -- -- 2100 DTSC-SL 4-Aminobiphenyl 92-67-1 0.026 USEPA RSL -- -- 0.071 DTSC-SL -- -- 4-Chloro-2-methylaniline
hydrochloride
3165-93-3 1.2 USEPA RSL -- -- 3.2 DTSC-SL -- --
4-Chloro-3-methylphenol 59-50-7 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL 4-Chloroaniline 106-47-8 2.7 USEPA RSL 250 USEPA RSL 7.4 DTSC-SL 2100 DTSC-SL 4-Chloronitrobenzene 100-00-5 9 USEPA RSL 44 USEPA RSL 25 DTSC-SL 370 DTSC-SL 4-Chlorotoluene 106-43-4 -- -- 440 DTSC-SL -- -- 2300 DTSC-SL 4-Dimethylaminoazobenzene 60-11-7 0.12 USEPA RSL -- -- 0.32 DTSC-SL -- -- 4-Methylphenol 106-44-5 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL 4-Nitroaniline 100-01-6 27 USEPA RSL 250 USEPA RSL 74 DTSC-SL 2100 DTSC-SL 4-Nitropyrene 57835-92-4 0.42 USEPA RSL -- -- 1.1 DTSC-SL -- -- 4-Nitrotoluene 99-99-0 34 USEPA RSL 250 USEPA RSL 93 DTSC-SL 2100 DTSC-SL 7,12-Dimethylbenz[a]anthracene 57-97-6 0.00046 USEPA RSL -- -- 0.0051 DTSC-SL -- -- 9,10-Anthraquinone 84-65-1 14 USEPA RSL 130 USEPA RSL 37 DTSC-SL 1100 DTSC-SL Acenaphthene 83-32-9 -- -- 3300 DTSC-SL -- -- 23000 DTSC-SL Acephate 30560-19-1 -- -- 76 USEPA RSL -- -- 640 DTSC-SL Acetaldehyde 75-07-0 9.1 DTSC-SL 82 USEPA RSL 40 DTSC-SL 340 USEPA RSL Acetochlor 34256-82-1 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Acetophenone 98-86-2 -- -- 6000 DTSC-SL -- -- 55000 DTSC-SL Acifluorfen sodium 62476-59-9 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL Acrylamide 79-06-1 0.24 USEPA RSL 130 USEPA RSL 3 DTSC-SL 1100 DTSC-SL Alachlor 15972-60-8 9.7 USEPA RSL 630 USEPA RSL 26 DTSC-SL 5300 DTSC-SL Aldicarb 116-06-3 -- -- 63 USEPA RSL -- -- 530 DTSC-SL
Aldicarb sulfone 1646-88-4 -- -- 63 USEPA RSL -- -- 530 DTSC-SL Aldrin 309-00-2 0.039 USEPA RSL 2.3 USEPA RSL 0.18 USEPA RSL 34 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
alpha-HCH 319-84-6 0.086 USEPA RSL 510 USEPA RSL 0.24 DTSC-SL 4200 DTSC-SL Ametryn 834-12-8 -- -- 570 USEPA RSL -- -- 4800 DTSC-SL Amitraz 33089-61-1 -- -- 160 USEPA RSL -- -- 1300 DTSC-SL Aniline 62-53-3 95 USEPA RSL 440 USEPA RSL 260 DTSC-SL 3700 DTSC-SL Anthracene 120-12-7 -- -- 17000 DTSC-SL -- -- 130000 DTSC-SL Aroclor 1016 12674-11-2 6.6 USEPA RSL 4 DTSC-SL 17 DTSC-SL 29 DTSC-SL Aroclor 1221 11104-28-2 0.2 USEPA RSL -- -- 0.53 DTSC-SL -- -- Aroclor 1232 11141-16-5 0.17 USEPA RSL -- -- 0.49 DTSC-SL -- -- Aroclor 1242 53469-21-9 0.23 USEPA RSL -- -- 0.58 DTSC-SL -- -- Aroclor 1248 12672-29-6 0.23 USEPA RSL -- -- 0.58 DTSC-SL -- -- Aroclor 1254 11097-69-1 0.24 USEPA RSL 1.2 USEPA RSL 0.59 DTSC-SL 8.4 DTSC-SL Aroclor 1260 11096-82-5 0.24 USEPA RSL -- -- 0.6 DTSC-SL -- -- Aroclor 5460 11126-42-4 -- -- 35 USEPA RSL -- -- 260 DTSC-SL Arsenic 7440-38-2 0.11 DTSC-SL 0.41 DTSC-SL 0.36 DTSC-SL 4.2 DTSC-SL Asulam 3337-71-1 -- -- 2300 USEPA RSL -- -- 19000 DTSC-SL Atrazine 1912-24-9 2.4 USEPA RSL 2200 USEPA RSL 6.4 DTSC-SL 19000 DTSC-SL Auramine 492-80-8 0.62 USEPA RSL -- -- 1.7 DTSC-SL -- -- Avermectin B1a 65195-55-3 -- -- 25 USEPA RSL -- -- 210 DTSC-SL Azinphos-methyl 86-50-0 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL Azodicarbonamide 123-77-3 -- -- 8600 USEPA RSL -- -- 39000 DTSC-SL Benfluralin 1861-40-1 -- -- 370 DTSC-SL -- -- 4800 DTSC-SL Benomyl 17804-35-2 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Bensulfuron methyl 83055-99-6 -- -- 13000 USEPA RSL -- -- 110000 DTSC-SL Bentazon 25057-89-0 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Benzaldehyde 100-52-7 46 DTSC-SL 4300 DTSC-SL 210 DTSC-SL 29000 DTSC-SL Benzene 71-43-2 0.33 DTSC-SL 11 DTSC-SL 1.4 DTSC-SL 46 DTSC-SL Benzidine 92-87-5 0.00024 DTSC-SL 190 USEPA RSL 0.003 DTSC-SL 1600 DTSC-SL Benzo[a]anthracene 56-55-3 1.1 USEPA RSL -- -- 12 DTSC-SL -- -- Benzo[a]pyrene 50-32-8 0.11 USEPA RSL 18 USEPA RSL 1.3 DTSC-SL 130 DTSC-SL Benzo[b]fluoranthene 205-99-2 1.1 USEPA RSL -- -- 13 DTSC-SL -- -- Benzo[j]fluoranthene 205-82-3 0.42 USEPA RSL -- -- 1.1 DTSC-SL -- -- Benzo[k]fluoranthene 207-08-9 11 USEPA RSL -- -- 130 DTSC-SL -- -- Benzoic acid 65-85-0 -- -- 250000 USEPA RSL -- -- 2100000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Benzotrichloride 98-07-7 0.028 DTSC-SL -- -- 0.13 DTSC-SL -- -- Benzyl alcohol 100-51-6 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Beryllium 7440-41-7 1600 USEPA RSL 16 DTSC-SL 6900 USEPA RSL 230 DTSC-SL Beryllium Sulfate 13510-49-1 1600 DTSC-SL 16 DTSC-SL 6900 DTSC-SL 230 DTSC-SL beta-HCH 319-85-7 0.3 USEPA RSL -- -- 0.82 DTSC-SL -- -- Bifenox 42576-02-3 -- -- 570 USEPA RSL -- -- 4800 DTSC-SL Biphenthrin 82657-04-3 -- -- 950 USEPA RSL -- -- 7900 DTSC-SL Biphenyl 92-52-4 56 DTSC-SL 47 USEPA RSL 260 DTSC-SL 200 USEPA RSL bis(2-Chloroethoxy) methane 111-91-1 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL bis(2-Chloroethyl) Ether 111-44-4 0.1 DTSC-SL -- -- 0.47 DTSC-SL -- -- bis(2-Ethylhexyl) phthalate 117-81-7 39 USEPA RSL 1300 USEPA RSL 110 DTSC-SL 11000 DTSC-SL bis-Chloroisopropyl Ether 108-60-1 -- -- 2000 DTSC-SL -- -- 16000 DTSC-SL Bisphenol A 80-05-7 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Bromodichloromethane 75-27-4 0.29 USEPA RSL 270 DTSC-SL 1.3 USEPA RSL 1300 DTSC-SL Bromoform 75-25-2 19 USEPA RSL 530 DTSC-SL 86 USEPA RSL 3000 DTSC-SL Bromophos 2104-96-3 -- -- 340 DTSC-SL -- -- 3800 DTSC-SL Bromoxynil 1689-84-5 5.3 USEPA RSL 950 USEPA RSL 14 DTSC-SL 7900 DTSC-SL Bromoxynil octanoate 1689-99-2 6.7 USEPA RSL 1100 DTSC-SL 32 USEPA RSL 15000 DTSC-SL Butyl benzyl phthalate 85-68-7 290 USEPA RSL 13000 USEPA RSL 780 DTSC-SL 110000 DTSC-SL Butylate 2008-41-5 -- -- 3200 DTSC-SL -- -- 33000 DTSC-SL Butylated hydroxyanisole 25013-16-5 2700 USEPA RSL -- -- 7400 DTSC-SL -- -- Butylated Hydroxytoluene 128-37-0 150 USEPA RSL 19000 USEPA RSL 410 DTSC-SL 160000 DTSC-SL Butylphthalyl butylglycolate 85-70-1 -- -- 63000 USEPA RSL -- -- 530000 DTSC-SL Cacodylic acid 75-60-5 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Cadmium (diet) 7440-43-9
(diet)
910 DTSC-SL 71 USEPA RSL 4000 DTSC-SL 780 DTSC-SL
Caprolactam 105-60-2 -- -- 31000 USEPA RSL -- -- 260000 DTSC-SL Captafol 2425-06-1 3.6 USEPA RSL 130 USEPA RSL 9.9 DTSC-SL 1100 DTSC-SL Captan 133-06-2 240 USEPA RSL 8200 USEPA RSL 640 DTSC-SL 69000 DTSC-SL Carbaryl 63-25-2 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Carbofuran 1563-66-2 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL Carbon tetrachloride 56-23-5 0.65 USEPA RSL 52 DTSC-SL 2.9 USEPA RSL 250 DTSC-SL Carbonyl sulfide 463-58-1 -- -- 6.7 DTSC-SL -- -- 28 DTSC-SL Carbosulfan 55285-14-8 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Carboxin 5234-68-4 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Chloral hydrate 302-17-0 -- -- 6900 DTSC-SL -- -- 80000 DTSC-SL Chloramben 133-90-4 -- -- 950 USEPA RSL -- -- 7900 DTSC-SL Chloranil 118-75-2 1.3 USEPA RSL -- -- 3.7 DTSC-SL -- -- Chlordane (technical) 12789-03-6 1.7 USEPA RSL 35 USEPA RSL 6.1 DTSC-SL 360 DTSC-SL Chlorfenvinphos 470-90-6 -- -- 44 USEPA RSL -- -- 370 DTSC-SL Chlorimuron-ethyl 90982-32-4 -- -- 5700 USEPA RSL -- -- 48000 DTSC-SL Chloroacetaldehyde 107-20-0 0.53 DTSC-SL -- -- 2.4 DTSC-SL -- -- Chlorobenzilate 510-15-6 4.9 USEPA RSL 1300 USEPA RSL 13 DTSC-SL 11000 DTSC-SL Chlorodibromomethane 124-48-1 0.94 DTSC-SL 470 DTSC-SL 4.1 DTSC-SL 2500 DTSC-SL Chlorothalonil 1897-45-6 32 DTSC-SL 950 USEPA RSL 87 DTSC-SL 7900 DTSC-SL Chlorozotocin 54749-90-5 0.0023 USEPA RSL -- -- 0.0062 DTSC-SL -- -- Chlorpropham 101-21-3 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Chlorpyrifos 2921-88-2 -- -- 63 USEPA RSL -- -- 530 DTSC-SL Chlorpyrifos-methyl 5598-13-0 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Chlorsulfuron 64902-72-3 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Chlorthal-dimethyl 1861-32-1 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Chlorthiophos 60238-56-4 -- -- 51 USEPA RSL -- -- 420 DTSC-SL Chromium (VI) 18540-29-9 0.3 USEPA RSL 230 USEPA RSL 6.2 DTSC-SL 3500 USEPA RSL Chrysene 218-01-9 110 USEPA RSL -- -- 1300 DTSC-SL -- -- cis-1,2-Dichloroethene 156-59-2 -- -- 18 DTSC-SL -- -- 84 DTSC-SL Clofentezine 74115-24-5 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL Cupferron 135-20-6 2.5 USEPA RSL -- -- 6.7 DTSC-SL -- -- Cyanazine 21725-46-2 0.65 USEPA RSL 130 USEPA RSL 1.8 DTSC-SL 1100 DTSC-SL Cyclohexylamine 108-91-8 -- -- 13000 DTSC-SL -- -- 120000 DTSC-SL Cyfluthrin 68359-37-5 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Cyhalothrin 68085-85-8 -- -- 63 USEPA RSL -- -- 530 DTSC-SL Cyromazine 66215-27-8 -- -- 32000 USEPA RSL -- -- 260000 DTSC-SL Dalapon 75-99-0 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Daminozide 1596-84-5 30 USEPA RSL 9500 USEPA RSL 82 DTSC-SL 79000 DTSC-SL Danitol 39515-41-8 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Demeton 8065-48-3 -- -- 2.5 USEPA RSL -- -- 21 DTSC-SL
Di(2-ethylhexyl)adipate 103-23-1 450 USEPA RSL 38000 USEPA RSL 1200 DTSC-SL 320000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Diallate 2303-16-4 8.9 USEPA RSL -- -- 24 DTSC-SL -- -- Diazinon 333-41-5 -- -- 44 USEPA RSL -- -- 370 DTSC-SL
Dibenz[a,h]anthracene 53-70-3 0.028 DTSC-SL -- -- 0.31 DTSC-SL -- -- Dibenzo[a,e]pyrene 192-65-4 0.042 USEPA RSL -- -- 0.11 DTSC-SL -- -- Dibenzofuran 132-64-9 -- -- 66 DTSC-SL -- -- 650 DTSC-SL Dibenzothiophene 132-65-0 -- -- 760 DTSC-SL -- -- 10000 DTSC-SL Dibutyltin Compounds E1790660 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Dicamba 1918-00-9 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Dichloroacetic acid 79-43-6 11 USEPA RSL 250 USEPA RSL 30 DTSC-SL 2100 DTSC-SL Dichlorvos 62-73-7 1.9 USEPA RSL 32 USEPA RSL 5.1 DTSC-SL 260 DTSC-SL Dicrotophos 141-66-2 -- -- 1.9 USEPA RSL -- -- 16 DTSC-SL Dieldrin 60-57-1 0.034 USEPA RSL 3.2 USEPA RSL 0.093 DTSC-SL 26 DTSC-SL Diethanolamine 111-42-2 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Diethyl phthalate 84-66-2 -- -- 51000 USEPA RSL -- -- 420000 DTSC-SL Diethylene glycol monobutyl Ether 112-34-5 -- -- 1900 USEPA RSL -- -- 15000 DTSC-SL Diethylene glycol monoethyl Ether 111-90-0 -- -- 3800 USEPA RSL -- -- 31000 DTSC-SL Diethylformamide 617-84-5 -- -- 69 DTSC-SL -- -- 790 DTSC-SL Diethylstilbestrol 56-53-1 0.0016 USEPA RSL -- -- 0.0042 DTSC-SL -- -- Difenzoquat 43222-48-6 -- -- 5200 USEPA RSL -- -- 44000 DTSC-SL Diflubenzuron 35367-38-5 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL diisopropyl Methylphosphonate 1445-75-6 -- -- 4200 DTSC-SL -- -- 34000 DTSC-SL Dimethipin 55290-64-7 -- -- 1400 USEPA RSL -- -- 12000 DTSC-SL Dimethoate 60-51-5 -- -- 140 USEPA RSL -- -- 1200 DTSC-SL Dimethyl methylphosphonate 756-79-6 320 USEPA RSL 3800 USEPA RSL 870 DTSC-SL 32000 DTSC-SL Dimethyl terephthalate 120-61-6 -- -- 4200 DTSC-SL -- -- 28000 DTSC-SL di-n-Butyl Phthalate 84-74-2 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Dinitrotoluenes 25321-14-6 1.2 USEPA RSL 57 USEPA RSL 3.3 DTSC-SL 480 DTSC-SL di-n-Octyl Phthalate 117-84-0 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Dinoseb 88-85-7 -- -- 63 USEPA RSL -- -- 530 DTSC-SL
Diphenamid 957-51-7 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Diphenyl Sulfone 127-63-9 -- -- 51 USEPA RSL -- -- 420 DTSC-SL Diphenylamine 122-39-4 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Diphenyl-p-phenylenediamine 74-31-7 -- -- 19 USEPA RSL -- -- 160 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Diquat 85-00-7 -- -- 140 USEPA RSL -- -- 1200 DTSC-SL
Direct Black 38 1937-37-7 0.073 DTSC-SL -- -- 0.2 DTSC-SL -- -- Direct Blue 6 2602-46-2 0.073 USEPA RSL -- -- 0.2 DTSC-SL -- -- Direct Brown 95 16071-86-6 0.081 USEPA RSL -- -- 0.22 DTSC-SL -- -- Disulfoton 298-04-4 -- -- 2.5 USEPA RSL -- -- 21 DTSC-SL Diuron 330-54-1 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL
Dodine 2439-10-3 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Endosulfan 115-29-7 -- -- 450 DTSC-SL -- -- 6000 DTSC-SL Endosulfan Sulfate 1031-07-8 -- -- 380 USEPA RSL -- -- 3200 DTSC-SL Endothall 145-73-3 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Endrin 72-20-8 -- -- 19 USEPA RSL -- -- 160 DTSC-SL
Epichlorohydrin 106-89-8 1.8 DTSC-SL 19 USEPA RSL 8.1 DTSC-SL 82 USEPA RSL Ethephon 16672-87-0 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL Ethion 563-12-2 -- -- 32 USEPA RSL -- -- 260 DTSC-SL
Ethyl Ether 60-29-7 -- -- 2200 DTSC-SL -- -- 10000 DTSC-SL Ethyl p-nitrophenyl
phenylphosphorothioate
2104-64-5 -- -- 0.63 USEPA RSL -- -- 5.3 DTSC-SL
Ethylene cyanohydrin 109-78-4 -- -- 4400 USEPA RSL -- -- 37000 DTSC-SL Ethylene diamine 107-15-3 -- -- 6400 DTSC-SL -- -- 77000 DTSC-SL Ethylene dibromide 106-93-4 0.036 USEPA RSL 7.1 DTSC-SL 0.16 USEPA RSL 30 DTSC-SL Ethylene glycol 107-21-1 -- -- 130000 USEPA RSL -- -- 1100000 DTSC-SL Ethylene thiourea 96-45-7 4.9 DTSC-SL 5.1 USEPA RSL 13 DTSC-SL 42 DTSC-SL Ethylphthalyl ethylglycolate 84-72-0 -- -- 190000 USEPA RSL -- -- 1600000 DTSC-SL Fenamiphos 22224-92-6 -- -- 16 USEPA RSL -- -- 130 DTSC-SL Fenvalerate 51630-58-1 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Fluometuron 2164-17-2 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL Fluoranthene 206-44-0 -- -- 2400 USEPA RSL -- -- 18000 DTSC-SL Fluorene 86-73-7 -- -- 2300 DTSC-SL -- -- 17000 DTSC-SL Fluoridone 59756-60-4 -- -- 5100 USEPA RSL -- -- 42000 DTSC-SL Flurprimidol 56425-91-3 -- -- 2500 USEPA RSL -- -- 21000 DTSC-SL Flusilazole 85509-19-9 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Flutolanil 66332-96-5 -- -- 32000 USEPA RSL -- -- 260000 DTSC-SL Fluvalinate 69409-94-5 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Folpet 133-07-3 -- -- 5700 USEPA RSL -- -- 48000 DTSC-SL Fomesafen 72178-02-0 -- -- 160 USEPA RSL -- -- 1300 DTSC-SL Fonofos 944-22-9 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Formaldehyde 50-00-0 11 USEPA RSL 700 DTSC-SL 50 USEPA RSL 3000 DTSC-SL Fosetyl-al 39148-24-8 -- -- 160000 USEPA RSL -- -- 1300000 DTSC-SL Furan 110-00-9 -- -- 9.5 DTSC-SL -- -- 44 DTSC-SL
Furazolidone 67-45-8 0.14 USEPA RSL -- -- 0.39 DTSC-SL -- -- Furium 531-82-8 0.36 USEPA RSL -- -- 0.99 DTSC-SL -- -- Furmecyclox 60568-05-0 18 USEPA RSL -- -- 49 DTSC-SL -- -- gamma-HCH 58-89-9 0.57 USEPA RSL 21 USEPA RSL 2 DTSC-SL 240 DTSC-SL Glufosinate-ammonium 77182-82-2 -- -- 380 USEPA RSL -- -- 3200 DTSC-SL Glutaraldehyde 111-30-8 -- -- 6000 USEPA RSL -- -- 48000 DTSC-SL Glyphosate 1071-83-6 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Guanidine 113-00-8 -- -- 690 DTSC-SL -- -- 8000 DTSC-SL Guanidine Chloride 50-01-1 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Guanidine Nitrate 506-93-4 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Haloxyfop-methyl 69806-40-2 -- -- 3.2 USEPA RSL -- -- 26 DTSC-SL HCH (mixed isomers) 608-73-1 0.14 DTSC-SL -- -- 0.37 DTSC-SL -- -- Heptachlor 76-44-8 0.13 USEPA RSL 38 DTSC-SL 0.63 USEPA RSL 510 DTSC-SL Heptachlor Epoxide 1024-57-3 0.07 USEPA RSL 0.99 DTSC-SL 0.33 USEPA RSL 14 DTSC-SL Hexabromobenzene 87-82-1 -- -- 150 DTSC-SL -- -- 2000 DTSC-SL Hexachlorobenzene 118-74-1 0.19 DTSC-SL 49 DTSC-SL 0.86 DTSC-SL 470 DTSC-SL Hexachlorobutadiene 87-68-3 1.2 USEPA RSL 29 DTSC-SL 5.3 USEPA RSL 160 DTSC-SL Hexachlorodibenzo-p-dioxin Mixture 34465-46-8 0.0001 USEPA RSL -- -- 0.00039 DTSC-SL -- -- Hexachlorophene 70-30-4 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Hexamethylphosphoramide 680-31-9 -- -- 25 USEPA RSL -- -- 210 DTSC-SL Hexanedioic Acid 124-04-9 -- -- 130000 USEPA RSL -- -- 1100000 DTSC-SL Hexazinone 51235-04-2 -- -- 2100 USEPA RSL -- -- 17000 DTSC-SL Hexythiazox 78587-05-0 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL HMX 2691-41-0 -- -- 3900 USEPA RSL -- -- 54000 DTSC-SL
Hydramethylnon 67485-29-4 -- -- 1100 USEPA RSL -- -- 9000 DTSC-SL Hydrogen Chloride 7647-01-0 -- -- 13000000 DTSC-SL -- -- 54000000 DTSC-SL Hydroquinone 123-31-9 9 USEPA RSL 2500 USEPA RSL 25 DTSC-SL 21000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Imazalil 35554-44-0 8.9 USEPA RSL 160 USEPA RSL 24 DTSC-SL 1300 DTSC-SL Imazaquin 81335-37-7 -- -- 16000 USEPA RSL -- -- 130000 DTSC-SL Imazethapyr 81335-77-5 -- -- 160000 USEPA RSL -- -- 1300000 DTSC-SL Indeno[1,2,3-cd]pyrene 193-39-5 1.1 USEPA RSL -- -- 13 DTSC-SL -- -- Iprodione 36734-19-7 -- -- 2500 USEPA RSL -- -- 21000 DTSC-SL Isobutanol 78-83-1 -- -- 14000 DTSC-SL -- -- 100000 DTSC-SL Isophorone 78-59-1 570 USEPA RSL 13000 USEPA RSL 1600 DTSC-SL 110000 DTSC-SL Isopropalin 33820-53-0 -- -- 1100 DTSC-SL -- -- 15000 DTSC-SL Isopropyl methyl phosphonic acid 1832-54-8 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Isoxaben 82558-50-7 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Kepone 143-50-0 0.054 USEPA RSL 19 USEPA RSL 0.15 DTSC-SL 160 DTSC-SL Lactofen 77501-63-4 -- -- 510 USEPA RSL -- -- 4200 DTSC-SL Lactonitrile 78-97-7 -- -- 13 USEPA RSL -- -- 110 DTSC-SL Lead and compounds 7439-92-1 -- -- 80 DTSC-SL-SL -- -- 320 DTSC-SL-SL Lead acetate 301-04-2 1.9 DTSC-SL -- -- 5.3 DTSC-SL -- -- Lead subacetate 1335-32-6 14 DTSC-SL -- -- 39 DTSC-SL -- -- Lewisite 541-25-3 -- -- 0.23 DTSC-SL -- -- 1.6 DTSC-SL
Linuron 330-55-2 -- -- 490 USEPA RSL -- -- 4100 DTSC-SL Malathion 121-75-5 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Maleic anhydride 108-31-6 -- -- 6300 USEPA RSL -- -- 52000 DTSC-SL Maleic hydrazide 123-33-1 -- -- 32000 USEPA RSL -- -- 260000 DTSC-SL Malononitrile 109-77-3 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL m-Aminophenol 591-27-5 -- -- 5100 USEPA RSL -- -- 42000 DTSC-SL Mancozeb 8018-01-7 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Maneb 12427-38-2 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL MCPA 94-74-6 -- -- 32 USEPA RSL -- -- 260 DTSC-SL
Mecoprop 93-65-2 -- -- 63 USEPA RSL -- -- 530 DTSC-SL
Mephosfolan 950-10-7 -- -- 5.7 USEPA RSL -- -- 48 DTSC-SL Mepiquat 24307-26-4 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Mercuric Chloride 7487-94-7 -- -- 13 DTSC-SL -- -- 190 DTSC-SL Mercury 7439-97-6 -- -- 1 DTSC-SL -- -- 4.4 DTSC-SL
Merphos 150-50-5 -- -- 2.3 USEPA RSL -- -- 34 DTSC-SL
Merphos oxide 78-48-8 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Metalaxyl 57837-19-1 -- -- 3800 USEPA RSL -- -- 32000 DTSC-SL Methamidophos 10265-92-6 -- -- 3.2 USEPA RSL -- -- 26 DTSC-SL Methidathion 950-37-8 -- -- 95 USEPA RSL -- -- 790 DTSC-SL Methomyl 16752-77-5 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Methoxychlor 72-43-5 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL Methyl acetate 79-20-9 -- -- 24000 DTSC-SL -- -- 130000 DTSC-SL Methyl Parathion 298-00-0 -- -- 16 USEPA RSL -- -- 130 DTSC-SL Methyl styrene (alpha) 98-83-9 -- -- 2200 DTSC-SL -- -- 13000 DTSC-SL Methylarsonic acid 124-58-3 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Methylcyclohexane 108-87-2 -- -- 5500 DTSC-SL -- -- 23000 DTSC-SL Methylene Chloride 75-09-2 2.2 DTSC-SL 310 DTSC-SL 26 DTSC-SL 2500 DTSC-SL Methylene diphenyl diisocyanate 101-68-8 -- -- 110000 DTSC-SL -- -- 480000 DTSC-SL Methylmethanesulfonate 66-27-3 5.5 USEPA RSL -- -- 15 DTSC-SL -- -- Methylphenols 1319-77-3 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Methylphosphonic acid 993-13-5 -- -- 3800 USEPA RSL -- -- 32000 DTSC-SL Metolachlor 51218-45-2 -- -- 9500 USEPA RSL -- -- 79000 DTSC-SL Metribuzin 21087-64-9 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Metsulfuron-methyl 74223-64-6 -- -- 16000 USEPA RSL -- -- 130000 DTSC-SL Mineral oils (I) 8012-95-1 -- -- 16000 DTSC-SL -- -- 71000 DTSC-SL Mirex 2385-85-5 0.036 USEPA RSL 15 DTSC-SL 0.17 USEPA RSL 220 DTSC-SL Molinate 2212-67-1 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Monomethylaniline 100-61-8 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Myclobutanil 88671-89-0 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL N,N-Dimethylaniline 121-69-7 8.6 DTSC-SL 98 DTSC-SL 39 DTSC-SL 750 DTSC-SL Naled 300-76-5 -- -- 120 DTSC-SL -- -- 1100 DTSC-SL
Naphthalene 91-20-3 2 DTSC-SL 130 USEPA RSL 6.5 DTSC-SL 570 DTSC-SL Napropamide 15299-99-7 -- -- 7600 USEPA RSL -- -- 64000 DTSC-SL n-Butyl alcohol 71-36-3 -- -- 4800 DTSC-SL -- -- 36000 DTSC-SL n-Butylbenzene 104-51-8 -- -- 2400 DTSC-SL -- -- 18000 DTSC-SL Nickel 7440-02-0 15000 USEPA RSL 820 DTSC-SL 64000 USEPA RSL 11000 DTSC-SL Nickel Acetate 373-02-4 15000 USEPA RSL 670 USEPA RSL 64000 USEPA RSL 5400 DTSC-SL Nickel Carbonate 3333-67-3 15000 USEPA RSL 670 USEPA RSL 64000 USEPA RSL 5400 DTSC-SL Nickel refinery dust E715532 15000 DTSC-SL 820 USEPA RSL 64000 DTSC-SL 11000 USEPA RSL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Nickelocene 1271-28-9 0.6 DTSC-SL 670 USEPA RSL 1.6 DTSC-SL 5400 DTSC-SL Nitrocellulose 9004-70-0 -- -- 190000000 USEPA RSL -- -- 1600000000 DTSC-SL Nitrofurantoin 67-20-9 -- -- 4400 USEPA RSL -- -- 37000 DTSC-SL Nitrofurazone 59-87-0 0.42 USEPA RSL -- -- 1.1 DTSC-SL -- -- Nitroglycerin 55-63-0 32 USEPA RSL 6.3 USEPA RSL 87 DTSC-SL 53 DTSC-SL Nitroguanidine 556-88-7 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL N-Methyl-N'-nitro-N-nitrosoguanidine 70-25-7 0.065 USEPA RSL -- -- 0.18 DTSC-SL -- -- N-Nitrosodiethanolamine 1116-54-7 0.19 USEPA RSL -- -- 0.53 DTSC-SL -- -- N-Nitrosodiethylamine 55-18-5 0.00081 USEPA RSL -- -- 0.0099 DTSC-SL -- -- N-Nitroso-di-n-butylamine 924-16-3 0.049 DTSC-SL -- -- 0.23 DTSC-SL -- -- N-Nitrosodiphenylamine 86-30-6 110 USEPA RSL -- -- 300 DTSC-SL -- -- N-Nitrosodipropylamine 621-64-7 0.078 USEPA RSL -- -- 0.21 DTSC-SL -- -- N-Nitrosomorpholine 59-89-2 0.081 USEPA RSL -- -- 0.22 DTSC-SL -- -- N-Nitroso-N-ethylurea 759-73-9 0.0045 USEPA RSL -- -- 0.055 DTSC-SL -- -- N-Nitroso-N-methylurea 684-93-5 0.001 USEPA RSL -- -- 0.012 DTSC-SL -- -- N-Nitrosopiperidine 100-75-4 0.058 USEPA RSL -- -- 0.16 DTSC-SL -- -- N-Nitrosopyrrolidine 930-55-2 0.26 USEPA RSL -- -- 0.71 DTSC-SL -- -- Norflurazon 27314-13-2 -- -- 950 USEPA RSL -- -- 7900 DTSC-SL o-Aminophenol 95-55-6 -- -- 250 USEPA RSL -- -- 2100 DTSC-SL Octabromodiphenyl Ethers 32536-52-0 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL Octamethylpyrophosphoramide 152-16-9 -- -- 130 USEPA RSL -- -- 1100 DTSC-SL Oryzalin 19044-88-3 70 USEPA RSL 8800 USEPA RSL 190 DTSC-SL 74000 DTSC-SL o-Toluidine 95-53-4 3 DTSC-SL -- -- 8.2 DTSC-SL -- --
Oxadiazon 19666-30-9 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL Oxamyl 23135-22-0 -- -- 1600 USEPA RSL -- -- 13000 DTSC-SL Oxyfluorfen 42874-03-3 7.4 USEPA RSL 1900 USEPA RSL 20 DTSC-SL 16000 DTSC-SL p,a,a,a-Tetrachlorotoluene 5216-25-1 0.027 DTSC-SL 4 DTSC-SL 0.13 DTSC-SL 43 DTSC-SL Paclobutrazol 76738-62-0 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL p-Aminophenol 123-30-8 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Paraquat dichloride 1910-42-5 -- -- 280 USEPA RSL -- -- 2400 DTSC-SL Parathion 56-38-2 -- -- 380 USEPA RSL -- -- 3200 DTSC-SL PCB-077 32598-13-3 0.038 USEPA RSL 0.41 USEPA RSL 0.094 DTSC-SL 3 DTSC-SL PCB-081 70362-50-4 0.012 USEPA RSL 0.13 USEPA RSL 0.03 DTSC-SL 1 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
PCB-105 32598-14-4 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-114 74472-37-0 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-118 31508-00-6 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-123 65510-44-3 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-126 57465-28-8 0.000036 USEPA RSL 0.00041 USEPA RSL 0.00009 DTSC-SL 0.003 DTSC-SL PCB-156 38380-08-4 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-157 69782-90-7 0.12 USEPA RSL 1.3 USEPA RSL 0.3 DTSC-SL 10 DTSC-SL PCB-167 52663-72-6 0.12 USEPA RSL 1.3 USEPA RSL 0.31 DTSC-SL 10 DTSC-SL PCB-169 32774-16-6 0.00012 USEPA RSL 0.0013 USEPA RSL 0.00031 DTSC-SL 0.01 DTSC-SL PCB-189 39635-31-9 0.13 USEPA RSL 1.3 USEPA RSL 0.31 DTSC-SL 10 DTSC-SL PCBs (Total) 1336-36-3 0.23 USEPA RSL -- -- 0.58 DTSC-SL -- -- p-Chlorobenzene sulfonic acid 98-66-8 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL p-Chlorobenzoic acid 74-11-3 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL p-Chloro-o-toluidine 95-69-2 2 DTSC-SL 190 USEPA RSL 5.5 DTSC-SL 1600 DTSC-SL Pebulate 1114-71-2 -- -- 2800 DTSC-SL -- -- 24000 DTSC-SL Pendimethalin 40487-42-1 -- -- 19000 USEPA RSL -- -- 160000 DTSC-SL Pentabromo-6-chloro cyclohexane 87-84-3 27 USEPA RSL 1300 USEPA RSL 74 DTSC-SL 11000 DTSC-SL Pentabromodiphenyl Ethers 32534-81-9 -- -- 150 DTSC-SL -- -- 2100 DTSC-SL Pentachlorobenzene 608-93-5 -- -- 51 DTSC-SL -- -- 510 DTSC-SL Pentachloroethane 76-01-7 1 DTSC-SL -- -- 4.6 DTSC-SL -- -- Pentachloronitrobenzene 82-68-8 2.3 DTSC-SL 220 DTSC-SL 11 DTSC-SL 3000 DTSC-SL Pentachlorophenol 87-86-5 1 USEPA RSL 250 USEPA RSL 2 DTSC-SL 1500 DTSC-SL Pentaerythritol tetranitrate (PETN) 78-11-5 140 USEPA RSL 130 USEPA RSL 370 DTSC-SL 1100 DTSC-SL Perfluorobutane sulfonic acid 375-73-5 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Perfluorobutanesulfonate 45187-15-3 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Permethrin 52645-53-1 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Phenacetin 62-44-2 250 USEPA RSL -- -- 670 DTSC-SL -- -- Phenmedipham 13684-63-4 -- -- 15000 USEPA RSL -- -- 130000 DTSC-SL Phenol 108-95-2 -- -- 19000 USEPA RSL -- -- 160000 DTSC-SL Phenol, 2-(1-methylethoxy)-,
methylcarbamate
114-26-1 -- -- 250 USEPA RSL -- -- 2100 DTSC-SL
Phenothiazine 92-84-2 -- -- 32 USEPA RSL -- -- 260 DTSC-SL Phenyl Isothiocyanate 103-72-0 -- -- 4.3 DTSC-SL -- -- 22 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Phenylmercaptan 108-98-5 -- -- 40 DTSC-SL -- -- 260 DTSC-SL Phenylmercuric acetate 62-38-4 -- -- 5.1 USEPA RSL -- -- 42 DTSC-SL Phorate 298-02-2 -- -- 13 USEPA RSL -- -- 110 DTSC-SL
Phosmet 732-11-6 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Phosphorus, White 7723-14-0 -- -- 0.42 DTSC-SL -- -- 2.2 DTSC-SL Phthalic anhydride 85-44-9 -- -- 130000 USEPA RSL -- -- 1000000 DTSC-SL Picloram 1918-02-1 -- -- 4400 USEPA RSL -- -- 37000 DTSC-SL Picramic Acid 96-91-3 -- -- 6.3 USEPA RSL -- -- 53 DTSC-SL Picric Acid 88-89-1 -- -- 57 USEPA RSL -- -- 480 DTSC-SL Pirimiphos-methyl 29232-93-7 -- -- 4.4 USEPA RSL -- -- 37 DTSC-SL Polybrominated Biphenyls (BP-6) 59536-65-1 0.018 USEPA RSL 0.44 USEPA RSL 0.049 DTSC-SL 3.7 DTSC-SL Polymeric methylenediphenyl
diisocyanate
9016-87-9 -- -- 110000 DTSC-SL -- -- 480000 DTSC-SL
Potassium Perfluorobutane Sulfonate 29420-49-3 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL p-Phthalic acid 100-21-0 -- -- 63000 USEPA RSL -- -- 530000 DTSC-SL Prochloraz 67747-09-5 3.6 USEPA RSL 570 USEPA RSL 9.9 DTSC-SL 4800 DTSC-SL Profluralin 26399-36-0 -- -- 450 DTSC-SL -- -- 6000 DTSC-SL Prometon 1610-18-0 -- -- 950 USEPA RSL -- -- 7900 DTSC-SL Prometryn 7287-19-6 -- -- 2500 USEPA RSL -- -- 21000 DTSC-SL Propachlor 1918-16-7 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL Propanil 709-98-8 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL Propargite 2312-35-8 2.8 USEPA RSL 2500 USEPA RSL 7.7 DTSC-SL 21000 DTSC-SL Propargyl alcohol 107-19-7 -- -- 120 DTSC-SL -- -- 1100 DTSC-SL Propazine 139-40-2 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Propham 122-42-9 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Propiconazole 60207-90-1 -- -- 6300 USEPA RSL -- -- 53000 DTSC-SL Propylene glycol 57-55-6 -- -- 1300000 USEPA RSL -- -- 11000000 DTSC-SL Propyzamide 23950-58-5 -- -- 4700 USEPA RSL -- -- 40000 DTSC-SL p-Toluic Acid 99-94-5 -- -- 320 USEPA RSL -- -- 2600 DTSC-SL p-Toluidine 106-49-0 18 USEPA RSL 250 USEPA RSL 49 DTSC-SL 2100 DTSC-SL Pyrene 129-00-0 -- -- 1800 USEPA RSL -- -- 13000 DTSC-SL Pyridine 110-86-1 -- -- 58 DTSC-SL -- -- 530 DTSC-SL
Quinalphos 13593-03-8 -- -- 32 USEPA RSL -- -- 260 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Quinoline 91-22-5 0.18 USEPA RSL -- -- 0.49 DTSC-SL -- -- Quizalofop-ethyl 76578-14-8 -- -- 570 USEPA RSL -- -- 4800 DTSC-SL RDX 121-82-4 8.3 USEPA RSL 300 USEPA RSL 35 DTSC-SL 4000 DTSC-SL Resmethrin 10453-86-8 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL Ronnel 299-84-3 -- -- 3800 DTSC-SL -- -- 51000 DTSC-SL
Rotenone 83-79-4 -- -- 250 USEPA RSL -- -- 2100 DTSC-SL Safrole 94-59-7 0.55 USEPA RSL -- -- 6.7 DTSC-SL -- --
sec-Butylbenzene 135-98-8 -- -- 2200 DTSC-SL -- -- 12000 DTSC-SL Sethoxydim 74051-80-2 -- -- 8800 USEPA RSL -- -- 74000 DTSC-SL S-Ethyl dipropylthiocarbamate 759-94-4 -- -- 3400 DTSC-SL -- -- 37000 DTSC-SL Silvex 93-72-1 -- -- 510 USEPA RSL -- -- 4200 DTSC-SL
Simazine 122-34-9 4.5 USEPA RSL 320 USEPA RSL 12 DTSC-SL 2600 DTSC-SL Sodium diethyldithiocarbamate 148-18-5 2 USEPA RSL 1900 USEPA RSL 5.5 DTSC-SL 16000 DTSC-SL Sodium fluoroacetate 62-74-8 -- -- 1.3 USEPA RSL -- -- 11 DTSC-SL Stirofos 961-11-5 23 USEPA RSL 1900 USEPA RSL 62 DTSC-SL 16000 DTSC-SL Strychnine 57-24-9 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Styrene 100-42-5 -- -- 5600 DTSC-SL -- -- 32000 DTSC-SL Styrene-Acrylonitrile (SAN) Trimer
(THNA isomer)
57964-39-3 -- -- 190 DTSC-SL -- -- 1600 DTSC-SL
Styrene-Acrylonitrile (SAN) Trimer
(THNP isomer)
57964-40-6 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL
Sulfolane 126-33-0 -- -- 63 USEPA RSL -- -- 530 DTSC-SL Tebuthiuron 34014-18-1 -- -- 4400 USEPA RSL -- -- 37000 DTSC-SL Temephos 3383-96-8 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Terbacil 5902-51-2 -- -- 820 USEPA RSL -- -- 6900 DTSC-SL Terbufos 13071-79-9 -- -- 1.8 DTSC-SL -- -- 23 DTSC-SL
Terbutryn 886-50-0 -- -- 63 USEPA RSL -- -- 530 DTSC-SL tert-Butylbenzene 98-06-6 -- -- 2200 DTSC-SL -- -- 12000 DTSC-SL Tetrachloroethene 127-18-4 0.59 DTSC-SL 81 USEPA RSL 2.7 DTSC-SL 390 USEPA RSL Tetraethyl Lead 78-00-2 -- -- 0.00072 DTSC-SL -- -- 0.0033 DTSC-SL Tetraethyldithiopyrophosphate 3689-24-5 -- -- 32 USEPA RSL -- -- 260 DTSC-SL Tetrahydrofuran 109-99-9 -- -- 18000 USEPA RSL -- -- 92000 DTSC-SL Thifensulfuron-methyl 79277-27-3 -- -- 2700 USEPA RSL -- -- 23000 DTSC-SL Thiobencarb 28249-77-6 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Thiocyanic acid (2-
benzothiazolylthio)methyl ester
21564-17-0 -- -- 1900 USEPA RSL -- -- 16000 DTSC-SL
Thiodiglycol 111-48-8 -- -- 5400 USEPA RSL -- -- 75000 DTSC-SL Thiofanox 39196-18-4 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Thiophanate-methyl 23564-05-8 45 DTSC-SL 1700 USEPA RSL 120 DTSC-SL 14000 DTSC-SL Thiram 137-26-8 -- -- 950 USEPA RSL -- -- 7900 DTSC-SL
Toluene 108-88-3 -- -- 1100 DTSC-SL -- -- 5300 DTSC-SL
Toluene-2,4-diisocyanate 584-84-9 16 DTSC-SL 6.4 USEPA RSL 76 DTSC-SL 27 USEPA RSL Toluene-2,5-diamine 95-70-5 3 USEPA RSL 13 USEPA RSL 8.2 DTSC-SL 110 DTSC-SL Toluene-2,6-diisocyanate 91-08-7 16 DTSC-SL 5.3 USEPA RSL 75 DTSC-SL 22 USEPA RSL Toxaphene 8001-35-2 0.45 DTSC-SL 5.7 USEPA RSL 1.2 DTSC-SL 48 DTSC-SL Toxaphene, Weathered E1841606 -- -- 1.9 USEPA RSL -- -- 16 DTSC-SL TPH (C17-C32 aromatic high) E1790676 -- -- 2400 USEPA RSL -- -- 18000 DTSC-SL TPH (C9-C16 aromatic medium) E1790674 -- -- 97 USEPA RSL -- -- 500 DTSC-SL Tralomethrin 66841-25-6 -- -- 470 USEPA RSL -- -- 4000 DTSC-SL trans-1,2-Dichloroethene 156-60-5 -- -- 130 DTSC-SL -- -- 600 DTSC-SL trans-Crotonaldehyde 123-73-9 0.086 DTSC-SL 39 DTSC-SL 0.38 DTSC-SL 260 DTSC-SL Triacetin 102-76-1 -- -- 5100000 USEPA RSL -- -- 42000000 DTSC-SL Triadimefon 43121-43-3 -- -- 2100 USEPA RSL -- -- 18000 DTSC-SL Triallate 2303-17-5 8.2 DTSC-SL 1900 DTSC-SL 38 DTSC-SL 25000 DTSC-SL Triasulfuron 82097-50-5 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Tribenuron-methyl 101200-48-0 -- -- 510 USEPA RSL -- -- 4200 DTSC-SL Tributyl phosphate 126-73-8 60 USEPA RSL 630 USEPA RSL 160 DTSC-SL 5300 DTSC-SL Tributyltin 688-73-3 -- -- 3.6 DTSC-SL -- -- 17 DTSC-SL Tributyltin Compounds E1790678 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Tributyltin oxide 56-35-9 -- -- 19 USEPA RSL -- -- 160 DTSC-SL Trichloroacetic acid 76-03-9 7.8 USEPA RSL 1300 USEPA RSL 21 DTSC-SL 11000 DTSC-SL Trichlorofluoromethane 75-69-4 -- -- 1200 DTSC-SL -- -- 5400 DTSC-SL Tricresyl Phosphates 1330-78-5 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Tridiphane 58138-08-2 -- -- 190 USEPA RSL -- -- 1600 DTSC-SL Triethyleneglycol 112-27-6 -- -- 130000 USEPA RSL -- -- 1100000 DTSC-SL Trifluralin 1582-09-8 81 DTSC-SL 570 DTSC-SL 380 DTSC-SL 7800 DTSC-SL Trimethyl phosphate 512-56-1 27 USEPA RSL 630 USEPA RSL 74 DTSC-SL 5300 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service
Registry
Number
Screening
Level for
Residential
Soil (mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Soil, Cancer
Endpoint,
Screening
Level for
Residential
Soil (mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Soil,
Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Cancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial
Soil, Cancer
Endpoint,
Screening
Level for
Commercial/
Industrial Soil
(mg/kg),
Noncancer
Endpoint
Reference for
Screening
Level for
Commercial/
Industrial Soil,
Noncancer
Endpoint
Triphenylphosphine oxide 791-28-6 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Tris(1,3-dichloro-2-propyl)phosphate 13674-87-8 -- -- 1300 USEPA RSL -- -- 11000 DTSC-SL Tris(1-chloro-2-propyl)phosphate 13674-84-5 -- -- 630 USEPA RSL -- -- 5300 DTSC-SL Tris(2-chloroethyl)phosphate 115-96-8 27 USEPA RSL 440 USEPA RSL 74 DTSC-SL 3700 DTSC-SL Tris(2-ethylhexyl)phosphate 78-42-2 170 USEPA RSL 6300 USEPA RSL 460 DTSC-SL 53000 DTSC-SL Uranium 7440-61-1 -- -- 16 DTSC-SL -- -- 230 DTSC-SL
Urethane 51-79-6 0.12 USEPA RSL -- -- 1.5 DTSC-SL -- -- Vernam 1929-77-7 -- -- 68 DTSC-SL -- -- 760 DTSC-SL
Vinclozolin 50471-44-8 -- -- 76 USEPA RSL -- -- 640 DTSC-SL Vinyl chloride 75-01-4 0.0082 DTSC-SL 70 USEPA RSL 0.15 DTSC-SL 370 USEPA RSL Warfarin 81-81-2 -- -- 19 USEPA RSL -- -- 160 DTSC-SL
Zineb 12122-67-7 -- -- 3200 USEPA RSL -- -- 26000 DTSC-SL Symbols, Abbreviations, and Acronyms:
-- = no value
DTSC = California Department of Toxic Substances Control mg/kg = milligrams per kilogram
RSL = Regional Screening Level
SL = screening level
USEPA = U.S. Environmental Protection Agency

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Table 2: HHRA Note 3 June 2020, DTSC-recommended Screening Levels for Tap Water Analytes Analyte
Chemical
Abstracts Service
Registry Number
Screening Level for Tap
Water (µg/L), Cancer
Endpoint
Reference for Screening
Level for Tap Water,
Cancer Endpoint
Screening Level for Tap
Water (µg/L), Noncancer
Endpoint
Reference for Screening
Level for Tap Water,
Noncancer Endpoint
1,1,1,2-Tetrachloroethane 630-20-6 0.57 USEPA RSL 160 DTSC-SL 1,1,1-Trichloroethane 71-55-6 -- -- 2000 DTSC-SL
1,1,2,2-Tetrachloroethane 79-34-5 0.076 USEPA RSL 110 DTSC-SL 1,1,2-Trichloropropane 598-77-6 -- -- 28 DTSC-SL
1,1-Dichloroethane 75-34-3 2.8 USEPA RSL 1200 DTSC-SL
1,1-Dichloroethene 75-35-4 -- -- 130 DTSC-SL
1,2,3-Trichlorobenzene 87-61-6 -- -- 3.4 DTSC-SL
1,2,3-Trichloropropane 96-18-4 0.0002 DTSC-SL 0.62 USEPA RSL 1,2,4,5-Tetrachlorobenzene 95-94-3 -- -- 1 DTSC-SL
1,2,4-Tribromobenzene 615-54-3 -- -- 22 DTSC-SL
1,2,4-Trichlorobenzene 120-82-1 0.46 DTSC-SL 4 USEPA RSL 1,2-Dibromo-3-chloropropane 96-12-8 0.0003 DTSC-SL 0.37 USEPA RSL 1,3-Dibromobenzene 108-36-1 -- -- 2 DTSC-SL
1,3-Dichloropropane 142-28-9 -- -- 110 DTSC-SL
1,4-Dibromobenzene 106-37-6 -- -- 51 DTSC-SL
1,4-Dithiane 505-29-3 -- -- 59 DTSC-SL
1-Bromo-3-fluorobenzene 1073-06-9 -- -- 1.7 DTSC-SL
1-Bromo-4-fluorobenzene 460-00-4 -- -- 1.6 DTSC-SL
1-Chlorobutane 109-69-3 -- -- 220 DTSC-SL
1-Methylnaphthalene 90-12-0 0.46 DTSC-SL 300 DTSC-SL
2,4,4-Trimethylpentene 25167-70-8 -- -- 36 DTSC-SL
2,4,6-Trichlorophenol 88-06-2 0.65 DTSC-SL 12 USEPA RSL 2,4/2,6-Dinitrotoluenes E1615210 0.11 USEPA RSL 17 DTSC-SL 2-Chloroethanol 107-07-3 -- -- 120 DTSC-SL
2-Chloronaphthalene 91-58-7 -- -- 350 DTSC-SL
2-Chlorophenol 95-57-8 -- -- 29 DTSC-SL
2-Chlorotoluene 95-49-8 -- -- 98 DTSC-SL
2-Methylnaphthalene 91-57-6 -- -- 17 DTSC-SL
2-Nitrotoluene 88-72-2 0.077 DTSC-SL 5.1 DTSC-SL
3,3'-Dichlorobenzidine 91-94-1 0.047 DTSC-SL -- --
4,4'-DDE 72-55-9 0.046 USEPA RSL 1.8 DTSC-SL
4,4'-Methylene-bis(2-chloroaniline) 101-14-4 0.011 DTSC-SL 26 USEPA RSL 4-Chlorotoluene 106-43-4 -- -- 100 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts Service
Registry Number
Screening Level for Tap
Water (µg/L), Cancer
Endpoint
Reference for Screening
Level for Tap Water,
Cancer Endpoint
Screening Level for Tap
Water (µg/L), Noncancer
Endpoint
Reference for Screening
Level for Tap Water,
Noncancer Endpoint
Acenaphthene 83-32-9 -- -- 260 DTSC-SL
Acetaldehyde 75-07-0 2.1 DTSC-SL 19 USEPA RSL
Acetophenone 98-86-2 -- -- 580 DTSC-SL
Aldrin 309-00-2 0.00092 USEPA RSL 0.18 DTSC-SL
Anthracene 120-12-7 -- -- 1000 DTSC-SL
Aroclor 1016 12674-11-2 0.22 USEPA RSL 0.41 DTSC-SL
Aroclor 1254 11097-69-1 0.0079 USEPA RSL 0.12 DTSC-SL
Aroclor 5460 11126-42-4 -- -- 3.5 DTSC-SL
Arsenic 7440-38-2 0.0082 DTSC-SL 0.07 DTSC-SL
Benfluralin 1861-40-1 -- -- 17 DTSC-SL
Benzaldehyde 100-52-7 4.3 DTSC-SL 580 DTSC-SL
Benzene 71-43-2 0.15 DTSC-SL 5.7 DTSC-SL
Benzidine 92-87-5 0.000049 DTSC-SL 59 USEPA RSL
Benzo[a]anthracene 56-55-3 0.017 DTSC-SL -- --
Benzotrichloride 98-07-7 0.0011 DTSC-SL -- --
Beryllium 7440-41-7 -- -- 4 DTSC-SL
Beryllium Sulfate 13510-49-1 -- -- 4 DTSC-SL
Biphenyl 92-52-4 1.6 DTSC-SL 0.83 USEPA RSL
bis(2-Chloroethyl) Ether 111-44-4 0.0063 DTSC-SL -- --
bis-Chloroisopropyl Ether 108-60-1 -- -- 230 DTSC-SL
Bromodichloromethane 75-27-4 0.13 USEPA RSL 120 DTSC-SL Bromoform 75-25-2 3.3 USEPA RSL 120 DTSC-SL
Bromophos 2104-96-3 -- -- 19 DTSC-SL
Bromoxynil octanoate 1689-99-2 0.24 USEPA RSL 56 DTSC-SL Butylate 2008-41-5 -- -- 220 DTSC-SL
Carbon tetrachloride 56-23-5 0.45 USEPA RSL 36 DTSC-SL
Carbonyl sulfide 463-58-1 -- -- 21 DTSC-SL
Chloral hydrate 302-17-0 -- -- 590 DTSC-SL
Chloroacetaldehyde 107-20-0 0.064 DTSC-SL -- --
Chlorodibromomethane 124-48-1 0.2 DTSC-SL 120 DTSC-SL
Chlorothalonil 1897-45-6 4 DTSC-SL 260 USEPA RSL
cis-1,2-Dichloroethene 156-59-2 -- -- 12 DTSC-SL
Cyanogen 460-19-5 -- -- 5.9 DTSC-SL
Cyanogen bromide 506-68-3 -- -- 530 DTSC-SL
Cyanogen chloride 506-77-4 -- -- 290 DTSC-SL
Cyclohexylamine 108-91-8 -- -- 1200 DTSC-SL
Dibenz[a,h]anthracene 53-70-3 0.0061 DTSC-SL -- --

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts Service
Registry Number
Screening Level for Tap
Water (µg/L), Cancer
Endpoint
Reference for Screening
Level for Tap Water,
Cancer Endpoint
Screening Level for Tap
Water (µg/L), Noncancer
Endpoint
Reference for Screening
Level for Tap Water,
Noncancer Endpoint
Dibenzofuran 132-64-9 -- -- 4 DTSC-SL
Dibenzothiophene 132-65-0 -- -- 37 DTSC-SL
Dieldrin 60-57-1 0.00066 USEPA RSL 0.18 DTSC-SL
Diethylformamide 617-84-5 -- -- 5.9 DTSC-SL
diisopropyl Methylphosphonate 1445-75-6 -- -- 470 DTSC-SL Dimethyl terephthalate 120-61-6 -- -- 580 DTSC-SL
Endosulfan 115-29-7 -- -- 33 DTSC-SL
Epichlorohydrin 106-89-8 0.19 DTSC-SL 2 USEPA RSL
Ethyl Ether 60-29-7 -- -- 1200 DTSC-SL
Ethylene diamine 107-15-3 -- -- 530 DTSC-SL
Ethylene dibromide 106-93-4 0.0075 USEPA RSL 1.7 DTSC-SL Ethylene thiourea 96-45-7 0.71 DTSC-SL 1.6 USEPA RSL
Fluorene 86-73-7 -- -- 160 DTSC-SL
Formaldehyde 50-00-0 0.39 USEPA RSL 19 DTSC-SL
Furan 110-00-9 -- -- 5.8 DTSC-SL
Guanidine 113-00-8 -- -- 59 DTSC-SL
HCH (mixed isomers) 608-73-1 0.011 DTSC-SL -- --
Heptachlor 76-44-8 0.0014 USEPA RSL 0.98 DTSC-SL
Heptachlor Epoxide 1024-57-3 0.0014 USEPA RSL 0.058 DTSC-SL Hexabromobenzene 87-82-1 -- -- 12 DTSC-SL
Hexachlorobenzene 118-74-1 0.0088 DTSC-SL 4.7 DTSC-SL
Hexachlorobutadiene 87-68-3 0.14 USEPA RSL 3.6 DTSC-SL
Hydrogen Chloride 7647-01-0 -- -- 19 DTSC-SL
Isobutanol 78-83-1 -- -- 1800 DTSC-SL
Isopropalin 33820-53-0 -- -- 30 DTSC-SL
Lead acetate 301-04-2 0.28 DTSC-SL -- --
Lead subacetate 1335-32-6 2.1 DTSC-SL -- --
Lewisite 541-25-3 -- -- 0.029 DTSC-SL
Mercuric Chloride 7487-94-7 -- -- 3 DTSC-SL
Mercury 7439-97-6 -- -- 0.063 DTSC-SL
Merphos 150-50-5 -- -- 0.18 DTSC-SL
Methoxychlor 72-43-5 -- -- 20 DTSC-SL
Methyl acetate 79-20-9 -- -- 5900 DTSC-SL
Methyl styrene (alpha) 98-83-9 -- -- 330 DTSC-SL
Methylcyclohexane 108-87-2 -- -- 13000 DTSC-SL
Methylene Chloride 75-09-2 1.7 DTSC-SL 100 DTSC-SL
Mineral oils (I) 8012-95-1 -- -- 18000 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts Service
Registry Number
Screening Level for Tap
Water (µg/L), Cancer
Endpoint
Reference for Screening
Level for Tap Water,
Cancer Endpoint
Screening Level for Tap
Water (µg/L), Noncancer
Endpoint
Reference for Screening
Level for Tap Water,
Noncancer Endpoint
Mirex 2385-85-5 0.00088 USEPA RSL 1.2 DTSC-SL
N,N-Dimethylaniline 121-69-7 0.63 DTSC-SL 11 DTSC-SL
Naled 300-76-5 -- -- 12 DTSC-SL
Naphthalene 91-20-3 0.12 DTSC-SL 6.1 USEPA RSL
n-Butyl alcohol 71-36-3 -- -- 590 DTSC-SL
n-Butylbenzene 104-51-8 -- -- 290 DTSC-SL
Nickel 7440-02-0 -- -- 220 DTSC-SL
Nickelocene 1271-28-9 0.086 DTSC-SL 220 USEPA RSL
N-Nitroso-di-n-butylamine 924-16-3 0.0014 DTSC-SL -- -- o-Toluidine 95-53-4 0.42 DTSC-SL -- --
p,a,a,a-Tetrachlorotoluene 5216-25-1 0.00076 DTSC-SL 0.23 DTSC-SL p-Chloro-o-toluidine 95-69-2 0.26 DTSC-SL 54 USEPA RSL
Pebulate 1114-71-2 -- -- 240 DTSC-SL
Pentabromodiphenyl Ethers 32534-81-9 -- -- 12 DTSC-SL
Pentachlorobenzene 608-93-5 -- -- 2.1 DTSC-SL
Pentachloroethane 76-01-7 0.18 DTSC-SL -- --
Pentachloronitrobenzene 82-68-8 0.05 DTSC-SL 13 DTSC-SL Phenyl Isothiocyanate 103-72-0 -- -- 1 DTSC-SL
Phenylmercaptan 108-98-5 -- -- 5.6 DTSC-SL
Phosphorus, White 7723-14-0 -- -- 0.12 DTSC-SL
Profluralin 26399-36-0 -- -- 17 DTSC-SL
Propargyl alcohol 107-19-7 -- -- 12 DTSC-SL
Pyrene 129-00-0 -- -- 81 DTSC-SL
Pyridine 110-86-1 -- -- 5.9 DTSC-SL
Ronnel 299-84-3 -- -- 210 DTSC-SL
sec-Butylbenzene 135-98-8 -- -- 590 DTSC-SL
S-Ethyl dipropylthiocarbamate 759-94-4 -- -- 270 DTSC-SL Styrene 100-42-5 -- -- 1100 DTSC-SL
Terbufos 13071-79-9 -- -- 0.11 DTSC-SL
tert-Butylbenzene 98-06-6 -- -- 380 DTSC-SL
Tetrachloroethene 127-18-4 0.084 DTSC-SL 41 USEPA RSL
Tetraethyl Lead 78-00-2 -- -- 0.00051 DTSC-SL
Thallium acetate 563-68-8 -- -- 0.059 DTSC-SL
Thallium carbonate 6533-73-9 -- -- 0.12 DTSC-SL
Thiocyanic acid 463-56-9 -- -- 1.2 DTSC-SL
Thiophanate-methyl 23564-05-8 6.4 DTSC-SL 530 USEPA RSL Toluene 108-88-3 -- -- 410 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts Service
Registry Number
Screening Level for Tap
Water (µg/L), Cancer
Endpoint
Reference for Screening
Level for Tap Water,
Cancer Endpoint
Screening Level for Tap
Water (µg/L), Noncancer
Endpoint
Reference for Screening
Level for Tap Water,
Noncancer Endpoint
Toluene-2,4-diisocyanate 584-84-9 0.34 DTSC-SL 0.017 USEPA RSL Toluene-2,6-diisocyanate 91-08-7 0.34 DTSC-SL 0.017 USEPA RSL Toxaphene 8001-35-2 0.065 DTSC-SL 1.8 USEPA RSL
trans-1,2-Dichloroethene 156-60-5 -- -- 110 DTSC-SL
trans-Crotonaldehyde 123-73-9 0.0091 DTSC-SL 5.9 DTSC-SL Triallate 2303-17-5 0.19 DTSC-SL 110 DTSC-SL
Tributyltin 688-73-3 -- -- 1.5 DTSC-SL
Trichlorofluoromethane 75-69-4 -- -- 1700 DTSC-SL
Trifluralin 1582-09-8 1.4 DTSC-SL 25 DTSC-SL
Vernam 1929-77-7 -- -- 4.8 DTSC-SL
Vinyl chloride 75-01-4 0.0098 DTSC-SL 45 USEPA RSL
Symbols, Abbreviations, and Acronyms:
-- = no value
µg/L = micrograms per liter
DTSC = California Department of Toxic Substances Control RSL = Regional Screening Level
SL = screening level
USEPA = U.S. Environmental Protection Agency

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Table 3: HHRA Note 3, June 2020, DTSC-recommended Screening Levels for Ambient Air Analytes Analyte
Chemical
Abstracts
Service Registry
Number
Screening
Level for
Residential
Air (µg/m3),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Cancer
Endpoint
Screening
Level for
Residential
Air (µg/m3),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Air
(µg/m3), Cancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Cancer
Endpoint
Screening Level
for Commercial/
Industrial Air
(µg/m3),
Noncancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Noncancer
Endpoint
1,1,1,2-Tetrachloroethane 630-20-6 0.38 USEPA RSL 130 DTSC-SL 1.7 USEPA RSL 530 DTSC-SL 1,1,1-Trichloroethane 71-55-6 -- -- 1000 DTSC-SL -- -- 4400 DTSC-SL 1,1,2,2-Tetrachloroethane 79-34-5 0.048 USEPA RSL 83 DTSC-SL 0.21 USEPA RSL 350 DTSC-SL 1,1,2-Trichloropropane 598-77-6 -- -- 21 DTSC-SL -- -- 88 DTSC-SL 1,1-Dichloroethane 75-34-3 1.8 USEPA RSL 830 DTSC-SL 7.7 USEPA RSL 3500 DTSC-SL 1,1-Dichloroethene 75-35-4 -- -- 73 DTSC-SL -- -- 310 DTSC-SL 1,2,3-Trichlorobenzene 87-61-6 -- -- 3.3 DTSC-SL -- -- 14 DTSC-SL 1,2,3-Trichloropropane 96-18-4 0.00014 DTSC-SL 0.31 USEPA RSL 0.0016 DTSC-SL 1.3 USEPA RSL 1,2,4,5-Tetrachlorobenzene 95-94-3 -- -- 1.3 DTSC-SL -- -- 5.3 DTSC-SL 1,2,4-Tribromobenzene 615-54-3 -- -- 21 DTSC-SL -- -- 88 DTSC-SL 1,2,4-Trichlorobenzene 120-82-1 0.38 DTSC-SL 2.1 USEPA RSL 1.7 DTSC-SL 8.8 USEPA RSL 1,3-Butadiene 106-99-0 0.017 DTSC-SL 2.1 USEPA RSL 0.072 DTSC-SL 8.8 USEPA RSL 1,3-Dibromobenzene 108-36-1 -- -- 1.7 DTSC-SL -- -- 7 DTSC-SL 1,3-Dichloropropane 142-28-9 -- -- 83 DTSC-SL -- -- 350 DTSC-SL 1,4-Dibromobenzene 106-37-6 -- -- 42 DTSC-SL -- -- 180 DTSC-SL 1,4-Dithiane 505-29-3 -- -- 42 DTSC-SL -- -- 180 DTSC-SL 1-Bromo-3-fluorobenzene 1073-06-9 -- -- 1.3 DTSC-SL -- -- 5.3 DTSC-SL 1-Bromo-4-fluorobenzene 460-00-4 -- -- 1.3 DTSC-SL -- -- 5.3 DTSC-SL 1-Chlorobutane 109-69-3 -- -- 170 DTSC-SL -- -- 700 DTSC-SL 1-Methylnaphthalene 90-12-0 0.39 DTSC-SL 290 DTSC-SL 1.7 DTSC-SL 1200 DTSC-SL 2,4,4-Trimethylpentene 25167-70-8 -- -- 42 DTSC-SL -- -- 180 DTSC-SL 2,4,6-Trichlorophenol 88-06-2 0.14 DTSC-SL -- -- 0.61 DTSC-SL -- -- 2-Chloroethanol 107-07-3 -- -- 83 DTSC-SL -- -- 350 DTSC-SL 2-Chloronaphthalene 91-58-7 -- -- 330 DTSC-SL -- -- 1400 DTSC-SL 2-Chlorophenol 95-57-8 -- -- 21 DTSC-SL -- -- 88 DTSC-SL 2-Chlorotoluene 95-49-8 -- -- 83 DTSC-SL -- -- 350 DTSC-SL 2-Methylnaphthalene 91-57-6 -- -- 17 DTSC-SL -- -- 70 DTSC-SL 2-Naphthylamine 91-59-8 0.0062 DTSC-SL -- -- 0.027 DTSC-SL -- -- 2-Nitrotoluene 88-72-2 0.051 DTSC-SL 3.8 DTSC-SL 0.22 DTSC-SL 16 DTSC-SL 4,4'-DDE 72-55-9 0.029 USEPA RSL 1.3 DTSC-SL 0.13 USEPA RSL 5.3 DTSC-SL 4-Chlorotoluene 106-43-4 -- -- 83 DTSC-SL -- -- 350 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service Registry
Number
Screening
Level for
Residential
Air (µg/m3),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Cancer
Endpoint
Screening
Level for
Residential
Air (µg/m3),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Air
(µg/m3), Cancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Cancer
Endpoint
Screening Level
for Commercial/
Industrial Air
(µg/m3),
Noncancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Noncancer
Endpoint
Acenaphthene 83-32-9 -- -- 250 DTSC-SL -- -- 1100 DTSC-SL Acetaldehyde 75-07-0 1 DTSC-SL 9.4 USEPA RSL 4.5 DTSC-SL 39 USEPA RSL Acetophenone 98-86-2 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL Aldrin 309-00-2 0.00057 USEPA RSL 0.13 DTSC-SL 0.0025 USEPA RSL 0.53 DTSC-SL Ammonia 7664-41-7 -- -- 210 DTSC-SL -- -- 880 DTSC-SL
Anthracene 120-12-7 -- -- 1300 DTSC-SL -- -- 5300 DTSC-SL Aroclor 1016 12674-11-2 0.14 USEPA RSL 0.29 DTSC-SL 0.61 USEPA RSL 1.2 DTSC-SL Aroclor 1254 11097-69-1 0.0049 USEPA RSL 0.083 DTSC-SL 0.021 USEPA RSL 0.35 DTSC-SL Aroclor 5460 11126-42-4 -- -- 2.5 DTSC-SL -- -- 11 DTSC-SL Arsine 7784-42-1 -- -- 0.016 DTSC-SL -- -- 0.066 DTSC-SL Benfluralin 1861-40-1 -- -- 21 DTSC-SL -- -- 88 DTSC-SL Benzaldehyde 100-52-7 2.8 DTSC-SL 420 DTSC-SL 12 DTSC-SL 1800 DTSC-SL Benzene 71-43-2 0.097 DTSC-SL 3.1 DTSC-SL 0.42 DTSC-SL 13 DTSC-SL Benzidine 92-87-5 0.0000072 DTSC-SL -- -- 0.000088 DTSC-SL -- -- Benzo[a]anthracene 56-55-3 0.0092 DTSC-SL -- -- 0.11 DTSC-SL -- -- Benzo[a]pyrene 50-32-8 0.00092 DTSC-SL 0.0021 USEPA RSL 0.011 DTSC-SL 0.0088 USEPA RSL Benzo[b]fluoranthene 205-99-2 0.0092 DTSC-SL -- -- 0.11 DTSC-SL -- -- Benzo[k]fluoranthene 207-08-9 0.0092 DTSC-SL -- -- 0.11 DTSC-SL -- -- Benzotrichloride 98-07-7 0.00086 DTSC-SL -- -- 0.0038 DTSC-SL -- -- Beryllium 7440-41-7 0.0012 USEPA RSL 0.0073 DTSC-SL 0.0051 USEPA RSL 0.031 DTSC-SL Beryllium Sulfate 13510-49-1 0.0012 DTSC-SL 0.0073 DTSC-SL 0.0051 DTSC-SL 0.031 DTSC-SL Biphenyl 92-52-4 1.4 DTSC-SL 0.42 USEPA RSL 6.1 DTSC-SL 1.8 USEPA RSL bis(2-Chloroethyl) Ether 111-44-4 0.004 DTSC-SL -- -- 0.017 DTSC-SL -- -- bis-Chloroisopropyl Ether 108-60-1 -- -- 170 DTSC-SL -- -- 700 DTSC-SL Bromodichloromethane 75-27-4 0.076 USEPA RSL 83 DTSC-SL 0.33 USEPA RSL 350 DTSC-SL Bromoform 75-25-2 2.6 USEPA RSL 83 DTSC-SL 11 USEPA RSL 350 DTSC-SL Bromophos 2104-96-3 -- -- 21 DTSC-SL -- -- 88 DTSC-SL
Bromoxynil octanoate 1689-99-2 -- -- 63 DTSC-SL -- -- 260 DTSC-SL Butylate 2008-41-5 -- -- 210 DTSC-SL -- -- 880 DTSC-SL
Cadmium (water) 7440-43-9 (water) 0.00067 DTSC-SL 0.01 USEPA RSL 0.0029 DTSC-SL 0.044 USEPA RSL Carbon tetrachloride 56-23-5 0.47 USEPA RSL 42 DTSC-SL 2 USEPA RSL 180 DTSC-SL Carbonyl sulfide 463-58-1 -- -- 10 DTSC-SL -- -- 44 DTSC-SL Chloral hydrate 302-17-0 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL Chloroacetaldehyde 107-20-0 0.042 DTSC-SL -- -- 0.18 DTSC-SL -- --

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service Registry
Number
Screening
Level for
Residential
Air (µg/m3),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Cancer
Endpoint
Screening
Level for
Residential
Air (µg/m3),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Air
(µg/m3), Cancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Cancer
Endpoint
Screening Level
for Commercial/
Industrial Air
(µg/m3),
Noncancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Noncancer
Endpoint
Chlorodibromomethane 124-48-1 0.13 DTSC-SL 83 DTSC-SL 0.58 DTSC-SL 350 DTSC-SL Chromium (VI) 18540-29-9 0.0000068 DTSC-SL 0.1 USEPA RSL 0.000082 DTSC-SL 0.44 USEPA RSL Chrysene 218-01-9 0.092 DTSC-SL -- -- 1.1 DTSC-SL -- -- cis-1,2-Dichloroethene 156-59-2 -- -- 8.3 DTSC-SL -- -- 35 DTSC-SL Cyanogen 460-19-5 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL
Cyanogen bromide 506-68-3 -- -- 380 DTSC-SL -- -- 1600 DTSC-SL Cyanogen chloride 506-77-4 -- -- 210 DTSC-SL -- -- 880 DTSC-SL Cyclohexylamine 108-91-8 -- -- 830 DTSC-SL -- -- 3500 DTSC-SL Dibenz[a,h]anthracene 53-70-3 0.00084 DTSC-SL -- -- 0.01 DTSC-SL -- -- Dibenzofuran 132-64-9 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL Dibenzothiophene 132-65-0 -- -- 42 DTSC-SL -- -- 180 DTSC-SL Dieldrin 60-57-1 0.00061 USEPA RSL 0.21 DTSC-SL 0.0027 USEPA RSL 0.88 DTSC-SL Diethylformamide 617-84-5 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL diisopropyl Methylphosphonate 1445-75-6 -- -- 330 DTSC-SL -- -- 1400 DTSC-SL Dimethyl terephthalate 120-61-6 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL Endosulfan 115-29-7 -- -- 25 DTSC-SL -- -- 110 DTSC-SL
Epichlorohydrin 106-89-8 0.12 DTSC-SL 1 USEPA RSL 0.53 DTSC-SL 4.4 USEPA RSL Ethyl Ether 60-29-7 -- -- 830 DTSC-SL -- -- 3500 DTSC-SL Ethylene diamine 107-15-3 -- -- 380 DTSC-SL -- -- 1600 DTSC-SL Ethylene dibromide 106-93-4 0.0047 USEPA RSL 0.83 DTSC-SL 0.02 USEPA RSL 3.5 DTSC-SL Fluorene 86-73-7 -- -- 170 DTSC-SL -- -- 700 DTSC-SL
Formaldehyde 50-00-0 0.22 USEPA RSL 9.4 DTSC-SL 0.94 USEPA RSL 39 DTSC-SL Furan 110-00-9 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL
Guanidine 113-00-8 -- -- 42 DTSC-SL -- -- 180 DTSC-SL
HCH (mixed isomers) 608-73-1 0.0026 DTSC-SL -- -- 0.011 DTSC-SL -- -- Heptachlor 76-44-8 0.0022 USEPA RSL 2.1 DTSC-SL 0.0094 USEPA RSL 8.8 DTSC-SL Heptachlor Epoxide 1024-57-3 0.0011 USEPA RSL 0.054 DTSC-SL 0.0047 USEPA RSL 0.23 DTSC-SL Hexabromobenzene 87-82-1 -- -- 8.3 DTSC-SL -- -- 35 DTSC-SL Hexachlorobenzene 118-74-1 0.0055 DTSC-SL 3.3 DTSC-SL 0.024 DTSC-SL 14 DTSC-SL Hexachlorobutadiene 87-68-3 0.13 USEPA RSL 4.2 DTSC-SL 0.56 USEPA RSL 18 DTSC-SL Hydrogen Chloride 7647-01-0 -- -- 9.4 DTSC-SL -- -- 39 DTSC-SL Indeno[1,2,3-cd]pyrene 193-39-5 0.0092 DTSC-SL -- -- 0.11 DTSC-SL -- -- Isobutanol 78-83-1 -- -- 1300 DTSC-SL -- -- 5300 DTSC-SL Isopropalin 33820-53-0 -- -- 63 DTSC-SL -- -- 260 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service Registry
Number
Screening
Level for
Residential
Air (µg/m3),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Cancer
Endpoint
Screening
Level for
Residential
Air (µg/m3),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Air
(µg/m3), Cancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Cancer
Endpoint
Screening Level
for Commercial/
Industrial Air
(µg/m3),
Noncancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Noncancer
Endpoint
Lead acetate 301-04-2 0.035 DTSC-SL -- -- 0.15 DTSC-SL -- -- Lewisite 541-25-3 -- -- 0.021 DTSC-SL -- -- 0.088 DTSC-SL Mercuric Chloride 7487-94-7 -- -- 0.031 DTSC-SL -- -- 0.13 DTSC-SL Mercury 7439-97-6 -- -- 0.031 DTSC-SL -- -- 0.13 DTSC-SL Merphos 150-50-5 -- -- 0.13 DTSC-SL -- -- 0.53 DTSC-SL
Methoxychlor 72-43-5 -- -- 21 DTSC-SL -- -- 88 DTSC-SL
Methyl acetate 79-20-9 -- -- 4200 DTSC-SL -- -- 18000 DTSC-SL Methyl styrene (alpha) 98-83-9 -- -- 290 DTSC-SL -- -- 1200 DTSC-SL Methylcyclohexane 108-87-2 -- -- 6300 DTSC-SL -- -- 26000 DTSC-SL Methylene Chloride 75-09-2 1 DTSC-SL 420 DTSC-SL 12 DTSC-SL 1800 DTSC-SL Methylene diphenyl diisocyanate 101-68-8 -- -- 0.083 DTSC-SL -- -- 0.35 DTSC-SL Mineral oils (I) 8012-95-1 -- -- 13000 DTSC-SL -- -- 53000 DTSC-SL Mirex 2385-85-5 0.00055 USEPA RSL 0.83 DTSC-SL 0.0024 USEPA RSL 3.5 DTSC-SL N,N-Dimethylaniline 121-69-7 0.42 DTSC-SL 8.3 DTSC-SL 1.8 DTSC-SL 35 DTSC-SL Naled 300-76-5 -- -- 8.3 DTSC-SL -- -- 35 DTSC-SL
n-Butyl alcohol 71-36-3 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL n-Butylbenzene 104-51-8 -- -- 210 DTSC-SL -- -- 880 DTSC-SL Nickel 7440-02-0 0.011 USEPA RSL 0.015 DTSC-SL 0.047 USEPA RSL 0.061 DTSC-SL Nickel refinery dust E715532 0.011 DTSC-SL 0.015 USEPA RSL 0.047 DTSC-SL 0.061 USEPA RSL N-Nitroso-di-n-butylamine 924-16-3 0.00091 DTSC-SL -- -- 0.004 DTSC-SL -- -- p,a,a,a-Tetrachlorotoluene 5216-25-1 0.0007 DTSC-SL 0.25 DTSC-SL 0.0031 DTSC-SL 1.1 DTSC-SL Pebulate 1114-71-2 -- -- 210 DTSC-SL -- -- 880 DTSC-SL
Pentabromodiphenyl Ethers 32534-81-9 -- -- 8.3 DTSC-SL -- -- 35 DTSC-SL Pentachlorobenzene 608-93-5 -- -- 3.3 DTSC-SL -- -- 14 DTSC-SL Pentachloroethane 76-01-7 0.12 DTSC-SL -- -- 0.55 DTSC-SL -- -- Pentachloronitrobenzene 82-68-8 0.043 DTSC-SL 13 DTSC-SL 0.19 DTSC-SL 53 DTSC-SL Phenyl Isothiocyanate 103-72-0 -- -- 0.83 DTSC-SL -- -- 3.5 DTSC-SL Phenylmercaptan 108-98-5 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL Phosphorus, White 7723-14-0 -- -- 0.083 DTSC-SL -- -- 0.35 DTSC-SL Polymeric methylenediphenyl diisocyanate 9016-87-9 -- -- 0.083 DTSC-SL -- -- 0.35 DTSC-SL Profluralin 26399-36-0 -- -- 25 DTSC-SL -- -- 110 DTSC-SL Propargyl alcohol 107-19-7 -- -- 8.3 DTSC-SL -- -- 35 DTSC-SL Pyrene 129-00-0 -- -- 130 DTSC-SL -- -- 530 DTSC-SL
Pyridine 110-86-1 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical
Abstracts
Service Registry
Number
Screening
Level for
Residential
Air (µg/m3),
Cancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Cancer
Endpoint
Screening
Level for
Residential
Air (µg/m3),
Noncancer
Endpoint
Reference for
Screening
Level for
Residential
Air, Noncancer
Endpoint
Screening
Level for
Commercial/
Industrial Air
(µg/m3), Cancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Cancer
Endpoint
Screening Level
for Commercial/
Industrial Air
(µg/m3),
Noncancer
Endpoint
Reference for
Screening Level
for Commercial/
Industrial Air,
Noncancer
Endpoint
Ronnel 299-84-3 -- -- 210 DTSC-SL -- -- 880 DTSC-SL
sec-Butylbenzene 135-98-8 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL S-Ethyl dipropylthiocarbamate 759-94-4 -- -- 210 DTSC-SL -- -- 880 DTSC-SL Styrene 100-42-5 -- -- 940 DTSC-SL -- -- 3900 DTSC-SL
Terbufos 13071-79-9 -- -- 0.1 DTSC-SL -- -- 0.44 DTSC-SL tert-Butylbenzene 98-06-6 -- -- 420 DTSC-SL -- -- 1800 DTSC-SL Tetrachloroethene 127-18-4 0.46 DTSC-SL 42 USEPA RSL 2 DTSC-SL 180 USEPA RSL Tetraethyl Lead 78-00-2 -- -- 0.00042 DTSC-SL -- -- 0.0018 DTSC-SL Thiocyanic acid 463-56-9 -- -- 0.83 DTSC-SL -- -- 3.5 DTSC-SL Toluene 108-88-3 -- -- 310 DTSC-SL -- -- 1300 DTSC-SL
trans-1,2-Dichloroethene 156-60-5 -- -- 83 DTSC-SL -- -- 350 DTSC-SL trans-Crotonaldehyde 123-73-9 0.0059 DTSC-SL 4.2 DTSC-SL 0.026 DTSC-SL 18 DTSC-SL Triallate 2303-17-5 0.16 DTSC-SL 100 DTSC-SL 0.68 DTSC-SL 440 DTSC-SL Tributyltin 688-73-3 -- -- 1.3 DTSC-SL -- -- 5.3 DTSC-SL Trichlorofluoromethane 75-69-4 -- -- 1300 DTSC-SL -- -- 5300 DTSC-SL Trifluralin 1582-09-8 1.5 DTSC-SL 31 DTSC-SL 6.4 DTSC-SL 130 DTSC-SL Vernolate 1929-77-7 -- -- 4.2 DTSC-SL -- -- 18 DTSC-SL
Vinyl chloride 75-01-4 0.0095 DTSC-SL 100 USEPA RSL 0.16 DTSC-SL 440 USEPA RSL Symbols, Abbreviations, and Acronyms:
-- = no value.
µg/m3 = microgram per cubic meter
DTSC = California Department of Toxic Substances Control RSL = Regional Screening Level
SL = screening level
USEPA = U.S. Environmental Protection Agency

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Table 4: HHRA Note 3, June 2020, Screening Levels for Tap Water that Exceed State or Federal Maximum Contaminant Levels Analyte
Chemical Abstracts
Service Registry Number
Screening Level
for Tap Water
(µg/L),
Cancer Endpoint
Reference for
Screening Level for
Tap Water,
Cancer Endpoint
Screening Level for
Tap Water (µg/L),
Noncancer Endpoint
Reference for
Screening Level for
Tap Water,
Noncancer Endpoint
California
Maximum
Contaminant Level
(MCL) (µg/L)
USEPA
Maximum
Contaminant Level
(MCL) (µg/L)
1,1,1-Trichloroethane 71-55-6 -- -- 2000 DTSC-SL 200 200 1,1,2,2-Tetrachloroethane 79-34-5 0.076 USEPA RSL 110 DTSC-SL 1 -- 1,1,2-Trichloro-1,2,2-
trifluoroethane 76-13-1 -- -- 10000 USEPA RSL 1200 --
1,1-Dichloroethane 75-34-3 2.8 USEPA RSL 1200 DTSC-SL 5 -- 1,1-Dichloroethene 75-35-4 -- -- 130 DTSC-SL 6 7
1,2,3-Trichloropropane 96-18-4 0.0002 DTSC-SL 0.62 USEPA RSL 0.005 -- 1,2-Dibromo-3-chloropropane 96-12-8 0.0003 DTSC-SL 0.37 USEPA RSL 0.2 0.2 1,2-Dichloroethane 107-06-2 0.17 USEPA RSL 13 USEPA RSL 0.5 5 1,2-Dichloropropane 78-87-5 0.85 USEPA RSL 8.2 USEPA RSL 5 5 1,3-Dichloropropene 542-75-6 0.47 USEPA RSL 39 USEPA RSL 0.5 -- 1,4-Dichlorobenzene 106-46-7 0.48 USEPA RSL 570 USEPA RSL 5 75 2,4-Dichlorophenoxyacetic acid 94-75-7 -- -- 170 USEPA RSL 70 70 Alachlor 15972-60-8 1.1 USEPA RSL 160 USEPA RSL 2 2
Aluminum 7429-90-5 -- -- 20000 USEPA RSL 1000 --
Antimony 7440-36-0 -- -- 7.8 USEPA RSL 6 6
Atrazine 1912-24-9 0.3 USEPA RSL 630 USEPA RSL 1 3
Barium 7440-39-3 -- -- 3800 USEPA RSL 1000 2000
Bentazon 25057-89-0 -- -- 570 USEPA RSL 18 --
Benzene 71-43-2 0.15 DTSC-SL 5.7 DTSC-SL 1 5
Benzo[a]pyrene 50-32-8 0.025 USEPA RSL 6 USEPA RSL 0.2 0.2 bis(2-Ethylhexyl) phthalate 117-81-7 5.6 USEPA RSL 400 USEPA RSL 4 6 Bromate 15541-45-4 0.11 USEPA RSL 80 USEPA RSL 10 10
Cadmium (water) 7440-43-9 (water) -- -- 9.2 USEPA RSL 5 5 Carbofuran 1563-66-2 -- -- 94 USEPA RSL 18 40
Carbon tetrachloride 56-23-5 0.46 USEPA RSL 36 DTSC-SL 0.5 5

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical Abstracts
Service Registry Number
Screening Level
for Tap Water
(µg/L),
Cancer Endpoint
Reference for
Screening Level for
Tap Water,
Cancer Endpoint
Screening Level for
Tap Water (µg/L),
Noncancer Endpoint
Reference for
Screening Level for
Tap Water,
Noncancer Endpoint
California
Maximum
Contaminant Level
(MCL) (µg/L)
USEPA
Maximum
Contaminant Level
(MCL) (µg/L)
Chlordane (technical) 12789-03-6 0.021 USEPA RSL 0.77 USEPA RSL 0.1 2 Chlorobenzene 108-90-7 -- -- 78 USEPA RSL 70 100
cis-1,2-Dichloroethene 156-59-2 -- -- 12 DTSC-SL 6 70
Dalapon 75-99-0 -- -- 600 USEPA RSL 200 200
Di(2-ethylhexyl)adipate 103-23-1 65 USEPA RSL 12000 USEPA RSL 400 400 Dichloroacetic acid 79-43-6 1.5 USEPA RSL 79 USEPA RSL 60 60 Dinoseb 88-85-7 -- -- 15 USEPA RSL 7 7
Diquat 85-00-7 -- -- 44 USEPA RSL 20 20
Endothall 145-73-3 -- -- 380 USEPA RSL 100 100
Endrin 72-20-8 -- -- 2.3 USEPA RSL 2 2
Ethylbenzene 100-41-4 1.5 USEPA RSL 810 USEPA RSL 300 700 Ethylene dibromide 106-93-4 0.0075 USEPA RSL 1.7 DTSC-SL 0.05 0.05 gamma-HCH 58-89-9 0.052 USEPA RSL 4.5 USEPA RSL 0.2 0.2 Glyphosate 1071-83-6 -- -- 2000 USEPA RSL 700 700
Heptachlor 76-44-8 0.0014 USEPA RSL 0.98 DTSC-SL 0.01 0.4 Heptachlor Epoxide 1024-57-3 0.0014 USEPA RSL 0.058 DTSC-SL 0.01 0.2 Hexachlorobenzene 118-74-1 0.0088 DTSC-SL 4.7 DTSC-SL 1 1 Mercuric Chloride 7487-94-7 -- -- 3 DTSC-SL 2 2
methyl tert-butyl Ether 1634-04-4 14 USEPA RSL 6300 USEPA RSL 13 -- Methylene Chloride 75-09-2 1.7 DTSC-SL 100 DTSC-SL 5 5
Molinate 2212-67-1 -- -- 30 USEPA RSL 20 --
Nickel 7440-02-0 -- -- 220 DTSC-SL 100 --
Nitrate 14797-55-8 -- -- 32000 USEPA RSL 45000 10000
Nitrite 14797-65-0 -- -- 2000 USEPA RSL 1000 1000
Oxamyl 23135-22-0 -- -- 500 USEPA RSL 50 200
Pentachlorophenol 87-86-5 0.041 USEPA RSL 23 USEPA RSL 1 1 Perchlorate Ion 14797-73-0 -- -- 14 USEPA RSL 6 15
Picloram 1918-02-1 -- -- 1400 USEPA RSL 500 500

HHRA Note Number 3 – DTSC-Modified Screening Levels – June 2020

Analyte
Chemical Abstracts
Service Registry Number
Screening Level
for Tap Water
(µg/L),
Cancer Endpoint
Reference for
Screening Level for
Tap Water,
Cancer Endpoint
Screening Level for
Tap Water (µg/L),
Noncancer Endpoint
Reference for
Screening Level for
Tap Water,
Noncancer Endpoint
California
Maximum
Contaminant Level
(MCL) (µg/L)
USEPA
Maximum
Contaminant Level
(MCL) (µg/L)
Selenium 7782-49-2 -- -- 100 USEPA RSL 50 50
Silvex 93-72-1 -- -- 110 USEPA RSL 50 50
Simazine 122-34-9 0.61 USEPA RSL 94 USEPA RSL 4 4
Styrene 100-42-5 -- -- 1100 DTSC-SL 100 100
Tetrachloroethene 127-18-4 0.084 DTSC-SL 41 USEPA RSL 5 5 Thiobencarb 28249-77-6 -- -- 160 USEPA RSL 70 --
Toluene 108-88-3 -- -- 410 DTSC-SL 150 1000
trans-1,2-Dichloroethene 156-60-5 -- -- 110 DTSC-SL 10 100 Trichloroacetic acid 76-03-9 1.1 USEPA RSL 390 USEPA RSL 60 60 Trichlorofluoromethane 75-69-4 -- -- 1700 DTSC-SL 150 -- Vinyl chloride 75-01-4 0.0098 DTSC-SL 45 USEPA RSL 0.5 2 Symbols, Abbreviations, and Acronyms:
-- = no value.
µg/L = micrograms per liter
CAS# = Chemical Abstracts Service Registry Number
DTSC = California Department of Toxic Substances Control MCL = Maximum Contaminant Level
RSL = Regional Screening Level
SL = screening level
USEPA = U.S. Environmental Protection Agency

Oilfield Environmental and Compliance, INC.

Dear Client:

Enclosed is an analytical report for the above referenced project. The samples included in this report were received on 19-Jun-10 14:10 and analyzed in accordance with the attached chain-of-custody.

Unless otherwise noted, all analytical testing was accomplished in accordance with the guidelines established in our Quality Assurance Manual, applicable standard operating procedures, and other related documentation. The results in this analytical report are limited to the samples tested and any reproduction thereof must be made in its entirety.

If you have any questions regarding this report, please do not hesitate to contact the undersigned.

Sincerely,
Work Order: 1002122
25 June 2010
Laboratory Manager
Lisa Race
Wade Allmon
1309 Morrison Ave.

Santa Barbara, CA 93103
RE: Watsonville
Wade Allmon
307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
Z3c 1002122-01 16-Jun-10 14:20 19-Jun-10 14:10 Solid
Z13e 1002122-02 16-Jun-10 17:15 19-Jun-10 14:10 Solid
Z14b 1002122-03 16-Jun-10 18:20 19-Jun-10 14:10 Solid
Z15c 1002122-04 16-Jun-10 18:55 19-Jun-10 14:10 Solid
Z17c 1002122-05 16-Jun-10 19:22 19-Jun-10 14:10 Solid
Z22c 1002122-06 17-Jun-10 11:55 19-Jun-10 14:10 Solid
Z23c 1002122-07 17-Jun-10 12:25 19-Jun-10 14:10 Solid
Z25a 1002122-08 17-Jun-10 13:20 19-Jun-10 14:10 Solid
Z28a 1002122-09 17-Jun-10 14:50 19-Jun-10 14:10 Solid
Y12e 1002122-10 17-Jun-10 15:30 19-Jun-10 14:10 Solid
Z30b 1002122-11 17-Jun-10 17:20 19-Jun-10 14:10 Solid
W1-3 1002122-12 18-Jun-10 08:20 19-Jun-10 14:10 Solid
W1-5 1002122-13 18-Jun-10 08:40 19-Jun-10 14:10 Solid
W1-10 1002122-14 18-Jun-10 08:45 19-Jun-10 14:10 Solid
W1-15 1002122-15 18-Jun-10 09:00 19-Jun-10 14:10 Solid
W1-20 1002122-16 18-Jun-10 09:10 19-Jun-10 14:10 Solid
W1-25 1002122-17 18-Jun-10 09:13 19-Jun-10 14:10 Solid
W2-2.5 1002122-18 18-Jun-10 09:45 19-Jun-10 14:10 Solid W2-5 1002122-19 18-Jun-10 09:52 19-Jun-10 14:10 Solid
W2-10 1002122-20 18-Jun-10 10:03 19-Jun-10 14:10 Solid
W2-15 1002122-21 18-Jun-10 10:10 19-Jun-10 14:10 Solid
W2-20 1002122-22 18-Jun-10 10:12 19-Jun-10 14:10 Solid
W2-25 1002122-23 18-Jun-10 10:30 19-Jun-10 14:10 Solid
W3-2.5 1002122-24 18-Jun-10 11:00 19-Jun-10 14:10 Solid W3-5 1002122-25 18-Jun-10 11:05 19-Jun-10 14:10 Solid
W3-10 1002122-26 18-Jun-10 11:11 19-Jun-10 14:10 Solid
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
W3-15 1002122-27 18-Jun-10 11:20 19-Jun-10 14:10 Solid
W3-20 1002122-28 18-Jun-10 11:25 19-Jun-10 14:10 Solid
W1-W 1002122-29 18-Jun-10 09:00 19-Jun-10 14:10 Water
W2-W 1002122-30 18-Jun-10 10:22 19-Jun-10 14:10 Water
W3-W 1002122-31 18-Jun-10 11:30 19-Jun-10 14:10 Water
Z33b 1002122-32 18-Jun-10 12:22 19-Jun-10 14:10 Solid
Z34f 1002122-33 18-Jun-10 13:05 19-Jun-10 14:10 Solid
Z35c 1002122-34 18-Jun-10 13:44 19-Jun-10 14:10 Solid
Z37b 1002122-35 18-Jun-10 14:30 19-Jun-10 14:10 Solid
Z38c 1002122-36 18-Jun-10 15:03 19-Jun-10 14:10 Solid
Z40a 1002122-37 18-Jun-10 16:16 19-Jun-10 14:10 Solid
Z26c 1002122-38 17-Jun-10 13:58 19-Jun-10 14:10 Solid
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z3c
1002122-01 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.97 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 11 0.99 " " "" " "
Barium 180 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 1.0 0.99 " " "" " "
Chromium 58 0.99 " " "" " " N-02
Cobalt 9.8 0.99 " " "" " "
Copper 51 0.99 " " "" " "
Lead 200 4.0 " 20 " " 23-Sep-10 " N-02, N-03
Mercury 0.10 0.098 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.99 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 76 0.99 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 0.99 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 280 40 " 20 " " 23-Jun-10 "
Vanadium 28 5.0 " 5 " " 22-Jun-10 "
Zinc 200 9.9 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z13e
1002122-02 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.10 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.7 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 16 0.94 " " "" " "
Barium 240 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 0.94 ND " " " "" "
Chromium 51 0.94 " " "" " " N-02
Cobalt 10 0.94 " " "" " "
Copper 31 0.94 " " "" " "
Lead 350 3.8 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.53 0.093 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.94 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 69 0.94 " " "" " "
Selenium 4.7 ND " " " "" "
Silver 0.94 ND " " " "" "
Thallium 4.7 ND " " " "" "
Titanium 250 38 " 20 " " 23-Jun-10 "
Vanadium 29 4.7 " 5 " " 22-Jun-10 "
Zinc 480 9.4 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z14b
1002122-03 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.29 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 4.5 0.96 " " "" " "
Barium 380 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 0.96 ND " " " "" "
Chromium 31 0.96 " " "" " "
Cobalt 8.8 0.96 " " "" " "
Copper 42 0.96 " " "" " "
Lead 670 9.6 " 50 " " 23-Jun-10 " N-02, N-03
Mercury 0.11 0.098 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 35 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 260 38 " 20 " " 23-Jun-10 "
Vanadium 34 4.8 " 5 " " 22-Jun-10 "
Zinc 500 9.6 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z15c
1002122-04 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.08 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 3.9 0.99 " " "" " "
Barium 130 0.49 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 0.99 ND " " " "" "
Chromium 31 0.99 " " "" " "
Cobalt 6.4 0.99 " " "" " "
Copper 42 0.99 " " "" " "
Lead 390 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.098 ND " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.99 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 49 0.99 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.99 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 260 39 " 20 " " 23-Jun-10 "
Vanadium 41 4.9 " 5 " " 22-Jun-10 "
Zinc 240 9.9 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z17c
1002122-05 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.56 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 10 0.98 " " "" " "
Barium 120 0.49 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 0.98 ND " " " "" "
Chromium 35 0.98 " " "" " "
Cobalt 9.0 0.98 " " "" " "
Copper 47 0.98 " " "" " "
Lead 370 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.097 ND " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 31 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 340 39 " 20 " " 23-Jun-10 "
Vanadium 45 4.9 " 5 " " 22-Jun-10 "
Zinc 710 25 " 50 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z22c
1002122-06 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 6.59 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 10 0.98 " " "" " "
Barium 380 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 0.98 ND " " " "" "
Chromium 50 0.98 " " "" " " N-02
Cobalt 8.4 0.98 " " "" " "
Copper 56 0.98 " " "" " "
Lead 1700 20 " 100 " " 23-Jun-10 " N-01, N-03
Mercury 0.13 0.093 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 25 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 300 39 " 20 " " 23-Jun-10 "
Vanadium 41 4.9 " 5 " " 22-Jun-10 "
Zinc 250 9.8 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z23c
1002122-07 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.73 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 12 1.0 " " "" " "
Barium 120 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 1.2 1.0 " " "" " "
Chromium 40 1.0 " " "" " "
Cobalt 8.1 1.0 " " "" " "
Copper 57 1.0 " " "" " "
Lead 280 4.0 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 4.3 0.49 " 5 A006372 22-Jun-10 23-Jun-10 EPA 7471A N-02, N-03 Molybdenum 1.0 ND " " A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 35 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 320 40 " 20 " " 23-Jun-10 "
Vanadium 38 5.0 " 5 " " 22-Jun-10 "
Zinc 240 10 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z25a
1002122-08 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.21 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 7.2 0.96 " " "" " "
Barium 460 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 4.2 0.96 " " "" " "
Chromium 81 0.96 " " "" " " N-02
Cobalt 8.0 0.96 " " "" " "
Copper 120 0.96 " " "" " "
Lead 1400 19 " 100 " " 23-Jun-10 " N-01, N-03
Mercury 0.14 0.093 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.7 0.96 " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 35 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 300 38 " 20 " " 23-Jun-10 "
Vanadium 42 4.8 " 5 " " 22-Jun-10 "
Zinc 1400 48 " 100 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z28a
1002122-09 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.22 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 3.9 0.96 " " "" " "
Barium 160 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 1.5 0.96 " " "" " "
Chromium 28 0.96 " " "" " "
Cobalt 9.2 0.96 " " "" " "
Copper 98 0.96 " " "" " "
Lead 150 3.8 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.14 0.097 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.5 0.96 " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 20 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 340 38 " 20 " " 23-Jun-10 "
Vanadium 54 4.8 " 5 " " 22-Jun-10 "
Zinc 450 9.6 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Y12e
1002122-10 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.82 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 5.9 0.97 " " "" " "
Barium 340 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 2.1 0.97 " " "" " "
Chromium 26 0.97 " " "" " "
Cobalt 9.7 0.97 " " "" " "
Copper 45 0.97 " " "" " "
Lead 650 9.7 " 50 " " 23-Jun-10 " N-02, N-03
Mercury 0.28 0.094 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.97 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 28 0.97 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.97 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 360 39 " 20 " " 23-Jun-10 "
Vanadium 45 4.8 " 5 " " 22-Jun-10 "
Zinc 680 24 " 50 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z30b
1002122-11 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.68 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 9.5 0.96 " " "" " "
Barium 270 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 1.3 0.96 " " "" " "
Chromium 74 0.96 " " "" " " N-02
Cobalt 14 0.96 " " "" " "
Copper 47 0.96 " " "" " "
Lead 170 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.22 0.096 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 91 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 310 39 " 20 " " 23-Jun-10 "
Vanadium 43 4.8 " 5 " " 22-Jun-10 "
Zinc 370 9.6 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-3
1002122-12 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.00 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 3.2 0.96 " " "" " "
Barium 120 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.96 ND " " " "" "
Chromium 38 0.96 " " "" " "
Cobalt 9.0 0.96 " " "" " "
Copper 16 0.96 " " "" " "
Lead 5.9 0.96 " " "" " "
Mercury 0.099 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 36 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 380 38 " 20 " " 23-Jun-10 "
Vanadium 38 4.8 " 5 " " 22-Jun-10 "
Zinc 40 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-5
1002122-13 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.56 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.7 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 4.1 0.95 " " "" " "
Barium 150 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 0.95 ND " " " "" "
Chromium 36 0.95 " " "" " "
Cobalt 17 0.95 " " "" " "
Copper 11 0.95 " " "" " "
Lead 6.4 0.95 " " "" " "
Mercury 0.096 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.95 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 32 0.95 " " "" " "
Selenium 4.7 ND " " " "" "
Silver 0.95 ND " " " "" "
Thallium 4.7 ND " " " "" "
Titanium 380 38 " 20 " " 23-Jun-10 "
Vanadium 43 4.7 " 5 " " 22-Jun-10 "
Zinc 32 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-10
1002122-14 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.15 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 2.2 1.0 " " "" " "
Barium 120 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 1.0 ND " " " "" "
Chromium 95 1.0 " " "" " " N-02
Cobalt 9.2 1.0 " " "" " "
Copper 16 1.0 " " "" " "
Lead 3.7 1.0 " " "" " "
Mercury 0.096 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 72 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 700 100 " 50 " " 23-Jun-10 "
Vanadium 40 5.0 " 5 " " 22-Jun-10 "
Zinc 30 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-15
1002122-15 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.10 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 1.0 ND " " " "" "
Barium 170 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 1.0 ND " " " "" "
Chromium 46 1.0 " " "" " "
Cobalt 20 1.0 " " "" " "
Copper 23 1.0 " " "" " "
Lead 7.3 1.0 " " "" " "
Mercury 0.17 0.093 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 120 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 220 40 " 20 " " 23-Jun-10 "
Vanadium 24 5.0 " 5 " " 22-Jun-10 "
Zinc 47 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-20
1002122-16 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 6.86 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 2.5 0.98 " " "" " "
Barium 77 0.49 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.98 ND " " " "" "
Chromium 60 0.98 " " "" " " N-02
Cobalt 7.7 0.98 " " "" " "
Copper 11 0.98 " " "" " "
Lead 2.9 0.98 " " "" " "
Mercury 0.10 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 67 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 470 39 " 20 " " 23-Jun-10 "
Vanadium 26 4.9 " 5 " " 22-Jun-10 "
Zinc 26 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-25
1002122-17 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.04 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 1.4 0.96 " " "" " "
Barium 50 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.96 ND " " " "" "
Chromium 44 0.96 " " "" " "
Cobalt 6.4 0.96 " " "" " "
Copper 5.9 0.96 " " "" " "
Lead 2.1 0.96 " " "" " "
Mercury 0.099 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 53 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 260 39 " 20 " " 23-Jun-10 "
Vanadium 15 4.8 " 5 " " 22-Jun-10 "
Zinc 16 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-2.5
1002122-18 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 3.58 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 190 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Barium 150 2.0 " " "" " "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 0.98 ND " " " "" "
Chromium 71 0.98 " " "" " "
Cobalt 2.4 0.98 " " "" " "
Copper 47 0.98 " " "" " "
Lead 37 0.98 " " "" " "
Mercury 0.22 0.10 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 16 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 280 39 " 20 " " 23-Jun-10 "
Vanadium 51 4.9 " 5 " " 22-Jun-10 "
Zinc 48 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-5
1002122-19 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 3.77 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 120 0.96 " " "" " " N-02, N-03
Barium 130 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.96 ND " " " "" "
Chromium 69 0.96 " " "" " " N-02
Cobalt 4.8 0.96 " " "" " "
Copper 53 0.96 " " "" " "
Lead 6.8 0.96 " " "" " "
Mercury 0.10 0.097 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 33 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 310 96 " 50 " " 23-Jun-10 "
Vanadium 52 4.8 " 5 " " 22-Jun-10 "
Zinc 95 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-10
1002122-20 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 4.35 0.100 pH Units 1 A006396 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 8.5 0.97 " " "" " "
Barium 110 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.97 ND " " " "" "
Chromium 37 0.97 " " "" " "
Cobalt 7.2 0.97 " " "" " "
Copper 14 0.97 " " "" " "
Lead 4.4 0.97 " " "" " "
Mercury 0.097 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.97 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 43 0.97 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.97 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 270 39 " 20 " " 23-Jun-10 "
Vanadium 30 4.8 " 5 " " 22-Jun-10 "
Zinc 78 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-15
1002122-21 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.75 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 18 0.95 " " "" " "
Barium 120 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.95 ND " " " "" "
Chromium 65 0.95 " " "" " " N-02
Cobalt 13 0.95 " " "" " "
Copper 27 0.95 " " "" " "
Lead 8.5 0.95 " " "" " "
Mercury 0.13 0.097 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.95 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 89 0.95 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.95 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 210 38 " 20 " " 23-Jun-10 "
Vanadium 41 4.8 " 5 " " 22-Jun-10 "
Zinc 63 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-20
1002122-22 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 9.61 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 3.6 0.96 " " "" " "
Barium 100 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.96 ND " " " "" "
Chromium 65 0.96 " " "" " " N-02
Cobalt 7.6 0.96 " " "" " "
Copper 14 0.96 " " "" " "
Lead 4.3 0.96 " " "" " "
Mercury 0.099 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 79 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 240 38 " 20 " " 23-Jun-10 "
Vanadium 25 4.8 " 5 " " 22-Jun-10 "
Zinc 38 2.4 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-25
1002122-23 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.62 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.7 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 2.9 0.94 " " "" " "
Barium 98 0.47 " " "" " "
Beryllium 2.3 ND " " " "" "
Cadmium 0.94 ND " " " "" "
Chromium 54 0.94 " " "" " " N-02
Cobalt 9.9 0.94 " " "" " "
Copper 15 0.94 " " "" " "
Lead 4.1 0.94 " " "" " "
Mercury 0.13 0.095 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.94 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 81 0.94 " " "" " "
Selenium 4.7 ND " " " "" "
Silver 0.94 ND " " " "" "
Thallium 4.7 ND " " " "" "
Titanium 260 38 " 20 " " 23-Jun-10 "
Vanadium 25 4.7 " 5 " " 22-Jun-10 "
Zinc 39 2.3 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-2.5
1002122-24 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 5.14 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 24 1.0 " " "" " "
Barium 120 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 1.0 ND " " " "" "
Chromium 71 1.0 " " "" " " N-02
Cobalt 4.9 1.0 " " "" " "
Copper 82 1.0 " " "" " "
Lead 70 1.0 " " "" " " N-02
Mercury 0.10 0.095 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 42 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 270 40 " 20 " " 23-Jun-10 "
Vanadium 34 5.0 " 5 " " 22-Jun-10 "
Zinc 52 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-5
1002122-25 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 4.59 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 13 1.0 " " "" " "
Barium 130 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 1.0 ND " " " "" "
Chromium 66 1.0 " " "" " " N-02
Cobalt 7.7 1.0 " " "" " "
Copper 120 1.0 " " "" " "
Lead 8.2 1.0 " " "" " "
Mercury 0.096 0.093 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 53 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 270 40 " 20 " " 23-Jun-10 "
Vanadium 37 5.0 " 5 " " 22-Jun-10 "
Zinc 93 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-10
1002122-26 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 4.08 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 5.4 0.99 " " "" " "
Barium 160 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 0.99 ND " " " "" "
Chromium 54 0.99 " " "" " " N-02
Cobalt 6.3 0.99 " " "" " "
Copper 21 0.99 " " "" " "
Lead 6.5 0.99 " " "" " "
Mercury 0.097 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.99 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 52 0.99 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 0.99 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 330 40 " 20 " " 23-Jun-10 "
Vanadium 35 5.0 " 5 " " 22-Jun-10 "
Zinc 82 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-15
1002122-27 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 5.68 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 6.0 0.99 " " "" " "
Barium 120 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 0.99 ND " " " "" "
Chromium 62 0.99 " " "" " " N-02
Cobalt 19 0.99 " " "" " "
Copper 33 0.99 " " "" " "
Lead 8.0 0.99 " " "" " "
Mercury 0.15 0.099 " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.99 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 130 0.99 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 0.99 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 88 9.9 " " "" " "
Vanadium 37 5.0 " " "" " "
Zinc 86 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-20
1002122-28 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 5.96 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Arsenic 4.0 0.98 " " "" " "
Barium 160 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 0.98 ND " " " "" "
Chromium 61 0.98 " " "" " " N-02
Cobalt 10 0.98 " " "" " "
Copper 24 0.98 " " "" " "
Lead 6.2 0.98 " " "" " "
Mercury 0.096 ND " 1 A006373 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006374 22-Jun-10 22-Jun-10 EPA 6020 Nickel 81 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 250 39 " 20 " " 23-Jun-10 "
Vanadium 32 4.9 " 5 " " 22-Jun-10 "
Zinc 65 2.5 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W1-W
1002122-29 (Water)
Total Metals by EPA 6000/7000 Series Methods
Antimony 0.010 ND mg/L 1 A006363 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 0.010 ND " " " " 25-Jun-10 "
Barium 9.2 0.040 " 20 " " 22-Jun-10 "
Beryllium 0.016 0.0020 " 1 " " 22-Jun-10 "
Cadmium 0.018 0.0020 " " "" " "
Chromium 0.38 0.0040 " " "" " "
Cobalt 2.2 0.020 " 10 " " 22-Jun-10 "
Copper 0.24 0.0020 " 1 " " 22-Jun-10 "
Lead 0.022 0.0020 " " "" " "
Mercury 0.00020 ND " " A006371 22-Jun-10 22-Jun-10 EPA 7470A Molybdenum 0.020 ND " 10 A006363 21-Jun-10 22-Jun-10 EPA 6020 Nickel 3.0 0.020 " " "" " "
Selenium 0.040 ND " " " "" "
Silver 0.0020 ND " 1 " " 22-Jun-10 "
Thallium 0.0023 0.0020 " " "" " "
Titanium 0.46 0.040 " " "" " "
Vanadium 0.057 0.010 " " "" " "
Zinc 0.36 0.010 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W2-W
1002122-30 (Water)
Total Metals by EPA 6000/7000 Series Methods
Antimony 0.010 ND mg/L 1 A006363 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 0.010 ND " " " " 25-Jun-10 "
Barium 0.21 0.0020 " " " " 22-Jun-10 "
Beryllium 0.0053 0.0020 " " "" " "
Cadmium 0.0020 ND " " " "" "
Chromium 0.19 0.0040 " " "" " "
Cobalt 0.0050 0.0020 " " "" " "
Copper 0.011 0.0020 " " "" " "
Lead 0.0020 ND " " " "" "
Mercury 0.00020 ND " " A006371 22-Jun-10 22-Jun-10 EPA 7470A Molybdenum 0.0020 ND " " A006363 21-Jun-10 22-Jun-10 EPA 6020 Nickel 0.068 0.0020 " " "" " "
Selenium 0.0040 ND " " " "" "
Silver 0.0020 ND " " " "" "
Thallium 0.0020 ND " " " "" "
Titanium 1.4 0.20 " 5 " " 22-Jun-10 "
Vanadium 0.021 0.010 " 1 " " 22-Jun-10 "
Zinc 0.017 0.010 " " "" " "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch W3-W
1002122-31 (Water)
Total Metals by EPA 6000/7000 Series Methods
Antimony 0.010 ND mg/L 1 A006363 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 0.039 0.010 " " " " 25-Jun-10 "
Barium 0.076 0.0020 " " " " 22-Jun-10 "
Beryllium 0.020 0.0020 " " "" " "
Cadmium 0.15 0.0020 " " "" " "
Chromium 0.21 0.0040 " " "" " "
Cobalt 0.87 0.020 " 10 " " 22-Jun-10 "
Copper 1.8 0.020 " " "" " "
Lead 0.097 0.0020 " 1 " " 22-Jun-10 "
Mercury 0.00020 ND " " A006371 22-Jun-10 22-Jun-10 EPA 7470A Molybdenum 0.020 ND " 10 A006363 21-Jun-10 22-Jun-10 EPA 6020 Nickel 4.7 0.020 " " "" " "
Selenium 0.040 ND " " " "" "
Silver 0.0020 ND " 1 " " 22-Jun-10 "
Thallium 0.0020 ND " " " "" "
Titanium 0.96 0.40 " 10 " " 22-Jun-10 "
Vanadium 0.35 0.010 " 1 " " 22-Jun-10 "
Zinc 3.9 0.10 " 10 " " 22-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z33b
1002122-32 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.26 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 9.4 0.97 " " "" " "
Barium 110 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.97 ND " " " "" "
Chromium 45 0.97 " " "" " "
Cobalt 9.3 0.97 " " "" " "
Copper 33 0.97 " " "" " "
Lead 200 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.17 0.098 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.97 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 42 0.97 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.97 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 320 39 " 20 " " 23-Jun-10 "
Vanadium 37 4.8 " 5 " " 22-Jun-10 "
Zinc 160 9.7 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z34f
1002122-33 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.25 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 34 0.96 " " "" " "
Barium 110 0.48 " " "" " "
Beryllium 2.4 ND " " " "" "
Cadmium 0.96 ND " " " "" "
Chromium 39 0.96 " " "" " "
Cobalt 8.0 0.96 " " "" " "
Copper 28 0.96 " " "" " "
Lead 800 9.6 " 50 " " 23-Jun-10 " N-02, N-03
Mercury 0.12 0.10 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.96 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 41 0.96 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.96 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 320 38 " 20 " " 23-Jun-10 "
Vanadium 34 4.8 " 5 " " 22-Jun-10 "
Zinc 300 9.6 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z35c
1002122-34 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.75 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.8 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 7.3 0.97 " " "" " "
Barium 150 1.9 " 20 " " 23-Jun-10 "
Beryllium 2.4 ND " 5 " " 22-Jun-10 "
Cadmium 1.7 0.97 " " "" " "
Chromium 38 0.97 " " "" " "
Cobalt 8.3 0.97 " " "" " "
Copper 72 0.97 " " "" " "
Lead 260 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.11 0.096 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.97 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 44 0.97 " " "" " "
Selenium 4.8 ND " " " "" "
Silver 0.97 ND " " " "" "
Thallium 4.8 ND " " " "" "
Titanium 280 39 " 20 " " 23-Jun-10 "
Vanadium 31 4.8 " 5 " " 22-Jun-10 "
Zinc 380 9.7 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z37b
1002122-35 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 9.28 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 7.6 0.99 " " "" " "
Barium 350 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 1.1 0.99 " " "" " "
Chromium 36 0.99 " " "" " "
Cobalt 10 0.99 " " "" " "
Copper 40 0.99 " " "" " "
Lead 670 9.9 " 50 " " 23-Jun-10 " N-02, N-03
Mercury 0.10 0.092 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.99 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 37 0.99 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 0.99 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 330 40 " 20 " " 23-Jun-10 "
Vanadium 42 5.0 " 5 " " 22-Jun-10 "
Zinc 920 25 " 50 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z38c
1002122-36 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.69 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 5.4 1.0 " " "" " "
Barium 130 0.50 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 1.1 1.0 " " "" " "
Chromium 29 1.0 " " "" " "
Cobalt 9.2 1.0 " " "" " "
Copper 190 4.0 " 20 " " 23-Jun-10 "
Lead 420 4.0 " " "" " " N-02, N-03
Mercury 0.31 0.099 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 33 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 350 40 " 20 " " 23-Jun-10 "
Vanadium 40 5.0 " 5 " " 22-Jun-10 "
Zinc 380 10 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z40a
1002122-37 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 8.18 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 13 0.98 " " "" " "
Barium 300 2.0 " 20 " " 23-Jun-10 "
Beryllium 2.5 ND " 5 " " 22-Jun-10 "
Cadmium 2.0 0.98 " " "" " "
Chromium 39 0.98 " " "" " "
Cobalt 8.2 0.98 " " "" " "
Copper 41 0.98 " " "" " "
Lead 390 3.9 " 20 " " 23-Jun-10 " N-02, N-03
Mercury 0.29 0.097 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 0.98 ND " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 34 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 1.0 0.98 " " "" " "
Thallium 4.9 ND " " " "" "
Titanium 320 39 " 20 " " 23-Jun-10 "
Vanadium 33 4.9 " 5 " " 22-Jun-10 "
Zinc 540 25 " 50 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch Z26c
1002122-38 (Solid)
Wet Chemistry by EPA or APHA Standard Methods
pH 7.28 0.100 pH Units 1 A006397 21-Jun-10 21-Jun-10 9045 HoldX Total Metals by EPA 6000/7000 Series Methods
Antimony 4.9 ND mg/kg 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Arsenic 3.6 0.98 " " "" " "
Barium 120 0.49 " " "" " "
Beryllium 2.5 ND " " " "" "
Cadmium 2.0 0.98 " " "" " "
Chromium 49 0.98 " " "" " "
Cobalt 5.6 0.98 " " "" " "
Copper 160 3.9 " 20 " " 23-Jun-10 "
Lead 720 9.8 " 50 " " 23-Jun-10 " N-02, N-03
Mercury 0.22 0.097 " 1 A006372 22-Jun-10 23-Jun-10 EPA 7471A Molybdenum 1.9 0.98 " 5 A006359 21-Jun-10 22-Jun-10 EPA 6020 Nickel 27 0.98 " " "" " "
Selenium 4.9 ND " " " "" "
Silver 0.98 ND " " " "" "
Thallium 4.9 ND " " " "" "
Titanium 250 39 " 20 " " 23-Jun-10 "
Vanadium 28 4.9 " 5 " " 22-Jun-10 "
Zinc 470 9.8 " 20 " " 23-Jun-10 "
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Wet Chemistry by EPA or APHA Standard Methods - Quality Control Batch A006396 - EPA 9045 pH Prep
LCS (A006396-BS1) Prepared & Analyzed: 21-Jun-10
pH pH Units 3.91 0.100 4.00 10 97.8 90-110
LCS (A006396-BS2) Prepared & Analyzed: 21-Jun-10
pH pH Units 7.04 0.100 7.00 10 101 90-110
LCS (A006396-BS3) Prepared & Analyzed: 21-Jun-10
pH pH Units 10.1 0.100 10.0 10 101 90-110
Duplicate (A006396-DUP1) Source: 1002122-01 Prepared & Analyzed: 21-Jun-10 pH pH Units 8.91 0.100 8.97 10 0.671
Batch A006397 - EPA 9045 pH Prep
LCS (A006397-BS1) Prepared & Analyzed: 21-Jun-10
pH pH Units 3.90 0.100 4.00 10 97.5 90-110
LCS (A006397-BS2) Prepared & Analyzed: 21-Jun-10
pH pH Units 6.98 0.100 7.00 10 99.7 90-110
LCS (A006397-BS3) Prepared & Analyzed: 21-Jun-10
pH pH Units 10.0 0.100 10.0 10 100 90-110
Duplicate (A006397-DUP1) Source: 1002122-21 Prepared & Analyzed: 21-Jun-10 pH pH Units 8.68 0.100 8.75 10 0.803
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006359 - EPA 3050B
Blank (A006359-BLK1) Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/kg ND 2.0
Antimony " ND 1.0
Arsenic " ND 0.20
Barium " ND 0.10
Beryllium " ND 0.50
Cadmium " ND 0.20
Chromium " ND 0.20
Cobalt " ND 0.20
Copper " ND 0.20
Lead ND 0.20 "
Molybdenum " ND 0.20
Nickel " ND 0.20
Selenium " ND 1.0
Silver " ND 0.20
Thallium " ND 1.0
Vanadium " ND 1.0
Zinc ND 0.50 "
LCS (A006359-BS1) Prepared: 21-Jun-10 Analyzed: 23-Jun-10 Titanium mg/kg 15.3 2.0 15.0 20 102 85-115
Antimony " 16.1 1.0 15.0 20 108 85-115
Arsenic " 15.6 0.20 15.0 20 104 85-115
Barium " 14.5 0.10 15.0 20 96.9 85-115
Beryllium " 14.6 0.50 15.0 20 97.4 85-115
Cadmium " 15.2 0.20 15.0 20 101 85-115
Chromium " 14.7 0.20 15.0 20 98.1 85-115
Cobalt " 15.0 0.20 15.0 20 100 85-115
Copper " 14.8 0.20 15.0 20 98.8 85-115
Lead 14.8 0.20 15.0 20 " 98.6 85-115
Molybdenum " 14.6 0.20 15.0 20 97.0 85-115
Nickel " 15.0 0.20 15.0 20 100 85-115
Selenium " 15.3 1.0 15.0 20 102 85-115
Silver " 15.1 0.20 15.0 20 100 85-115
Thallium " 14.4 1.0 15.0 20 96.0 85-115
Vanadium " 14.6 1.0 15.0 20 97.2 85-115
Zinc 14.9 0.50 15.0 20 " 99.4 85-115
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006359 - EPA 3050B
LCS Dup (A006359-BSD1) Prepared: 21-Jun-10 Analyzed: 23-Jun-10 Titanium mg/kg 15.2 2.0 15.0 20 102 0.107 85-115
Antimony " 15.6 1.0 15.0 20 104 3.56 85-115
Arsenic " 15.4 0.20 15.0 20 103 1.31 85-115
Barium " 14.8 0.10 15.0 20 98.4 1.55 85-115
Beryllium " 14.4 0.50 15.0 20 96.3 1.15 85-115
Cadmium " 15.3 0.20 15.0 20 102 0.618 85-115
Chromium " 14.9 0.20 15.0 20 99.1 1.02 85-115
Cobalt " 15.0 0.20 15.0 20 99.8 0.338 85-115
Copper " 15.0 0.20 15.0 20 99.8 0.996 85-115
Lead 14.9 0.20 15.0 20 " 99.3 0.738 85-115
Molybdenum " 14.5 0.20 15.0 20 96.9 0.161 85-115
Nickel " 15.1 0.20 15.0 20 101 0.342 85-115
Selenium " 15.1 1.0 15.0 20 101 1.44 85-115
Silver " 15.3 0.20 15.0 20 102 1.33 85-115
Thallium " 14.7 1.0 15.0 20 98.1 2.20 85-115
Vanadium " 14.7 1.0 15.0 20 98.1 0.939 85-115
Zinc 15.0 0.50 15.0 20 " 99.7 0.288 85-115
Duplicate (A006359-DUP1) Source: 1002122-01 Prepared: 21-Jun-10 Analyzed: 23-Jun-10 Titanium mg/kg 286 39 283 20 0.981
Antimony " ND 4.9 ND 20
Arsenic " 9.21 0.98 10.9 20 16.9
Barium " 165 2.0 182 20 9.83
Beryllium " ND 2.5 ND 20
Cadmium " 0.791 0.98 1.03 20 QR-04 26.1
Chromium " 60.4 0.98 57.8 20 4.56
Cobalt " 9.53 0.98 9.81 20 2.94
Copper " 41.8 0.98 51.5 20 QR-04 20.7
Lead 171 3.9 203 20 " 16.7
Molybdenum " ND 0.98 ND 20
Nickel " 74.9 0.98 76.4 20 2.03
Selenium " ND 4.9 ND 20
Silver " ND 0.98 ND 20
Thallium " ND 4.9 ND 20
Vanadium " 28.4 4.9 28.2 20 0.892
Zinc 156 9.8 196 20 QR-04 " 22.9
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006359 - EPA 3050B
Matrix Spike (A006359-MS1) Source: 1002122-01 Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Antimony mg/kg 38.6 20 298 ND 20 12.9 0-88
Arsenic " 293 4.0 298 10.9 20 94.8 73-124
Barium " 451 2.0 298 182 20 90.3 18-166
Beryllium " 312 9.9 298 ND 20 105 76-132
Cadmium " 295 4.0 298 1.03 20 98.6 82-118
Chromium " 370 4.0 298 57.8 20 105 58-139
Cobalt " 309 4.0 298 9.81 20 100 85-114
Copper " 332 4.0 298 51.5 20 94.2 64-138
Lead 442 4.0 298 203 20 " 80.4 61-138
Molybdenum " 251 4.0 298 ND 20 84.3 67-112
Nickel " 390 4.0 298 76.4 20 105 68-132
Selenium " 285 20 298 ND 20 95.5 66-132
Silver " 234 4.0 298 ND 20 78.3 18-153
Thallium " 294 20 298 ND 20 98.7 78-114
Vanadium " 326 20 298 28.2 20 99.9 80-119
Zinc 422 9.9 298 196 20 " 75.7 40-153
Matrix Spike Dup (A006359-MSD1) Source: 1002122-01 Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Antimony mg/kg 1.90 0.98 294 ND 20 QR-02 0.647 181 0-88 Arsenic " 290 3.9 294 10.9 20 94.7 0.0271 73-124
Barium " 522 2.0 294 182 20 QR-02 116 24.6 18-166
Beryllium " 292 9.8 294 ND 20 99.3 5.13 76-132
Cadmium " 296 3.9 294 1.03 20 100 1.63 82-118
Chromium " 355 3.9 294 57.8 20 101 3.53 58-139
Cobalt " 297 3.9 294 9.81 20 97.6 2.60 85-114
Copper " 332 3.9 294 51.5 20 95.5 1.33 64-138
Lead 511 3.9 294 203 20 QR-02 " 105 26.5 61-138
Molybdenum " 232 3.9 294 ND 20 79.0 6.55 67-112
Nickel " 370 3.9 294 76.4 20 99.7 5.20 68-132
Selenium " 277 20 294 ND 20 94.3 1.21 66-132
Silver " 224 3.9 294 ND 20 76.1 2.91 18-153
Thallium " 283 20 294 ND 20 96.3 2.45 78-114
Vanadium " 312 20 294 28.2 20 96.4 3.57 80-119
Zinc 425 9.8 294 196 20 " 77.8 2.71 40-153
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006363 - EPA 3005A
Blank (A006363-BLK1) Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L ND 0.020
Antimony " ND 0.0050
Arsenic " ND 0.0050
Barium " ND 0.0010
Beryllium " ND 0.0010
Cadmium " ND 0.0010
Chromium " ND 0.0020
Cobalt " ND 0.0010
Copper " ND 0.0010
Lead ND 0.0010 "
Molybdenum " ND 0.0010
Nickel " ND 0.0010
Selenium " ND 0.0020
Silver " ND 0.0010
Thallium " ND 0.0010
Vanadium " ND 0.0050
Zinc ND 0.0050 "
LCS (A006363-BS1) Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L 0.146 0.020 0.150 20 97.0 85-115
Antimony " 0.149 0.0050 0.150 20 99.1 85-115
Arsenic " 0.155 0.0050 0.150 20 103 85-115
Barium " 0.149 0.0010 0.150 20 99.4 85-115
Beryllium " 0.153 0.0010 0.150 20 102 85-115
Cadmium " 0.150 0.0010 0.150 20 100 85-115
Chromium " 0.150 0.0020 0.150 20 100 85-115
Cobalt " 0.152 0.0010 0.150 20 101 85-115
Copper " 0.153 0.0010 0.150 20 102 85-115
Lead 0.149 0.0010 0.150 20 " 99.0 85-115
Molybdenum " 0.148 0.0010 0.150 20 98.4 85-115
Nickel " 0.153 0.0010 0.150 20 102 85-115
Selenium " 0.157 0.0020 0.150 20 105 85-115
Silver " 0.151 0.0010 0.150 20 101 85-115
Thallium " 0.139 0.0010 0.150 20 92.7 85-115
Vanadium " 0.148 0.0050 0.150 20 98.6 85-115
Zinc 0.158 0.0050 0.150 20 " 105 85-115
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006363 - EPA 3005A
LCS Dup (A006363-BSD1) Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L 0.145 0.020 0.150 20 96.7 0.356 85-115
Antimony " 0.150 0.0050 0.150 20 99.8 0.689 85-115
Arsenic " 0.157 0.0050 0.150 20 105 1.45 85-115
Barium " 0.149 0.0010 0.150 20 99.4 0.0550 85-115
Beryllium " 0.153 0.0010 0.150 20 102 0.388 85-115
Cadmium " 0.151 0.0010 0.150 20 100 0.125 85-115
Chromium " 0.150 0.0020 0.150 20 99.7 0.555 85-115
Cobalt " 0.152 0.0010 0.150 20 101 0.142 85-115
Copper " 0.152 0.0010 0.150 20 101 0.527 85-115
Lead 0.148 0.0010 0.150 20 " 98.5 0.549 85-115
Molybdenum " 0.151 0.0010 0.150 20 100 2.03 85-115
Nickel " 0.152 0.0010 0.150 20 102 0.481 85-115
Selenium " 0.158 0.0020 0.150 20 105 0.571 85-115
Silver " 0.152 0.0010 0.150 20 102 0.710 85-115
Thallium " 0.140 0.0010 0.150 20 93.1 0.354 85-115
Vanadium " 0.147 0.0050 0.150 20 98.3 0.347 85-115
Zinc 0.158 0.0050 0.150 20 " 105 0.161 85-115
Duplicate (A006363-DUP1) Source: 1002122-29 Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L 0.480 0.040 0.460 20 4.19
Antimony " ND 0.010 ND 20
Arsenic " ND 0.010 0.00406 20
Barium " 9.43 0.040 9.16 20 2.87
Beryllium " 0.0168 0.0020 0.0163 20 3.17
Cadmium " 0.0177 0.0020 0.0178 20 0.880
Chromium " 0.386 0.0040 0.382 20 1.25
Cobalt " 2.20 0.020 2.22 20 0.942
Copper " 0.241 0.0020 0.238 20 1.42
Lead 0.0218 0.0020 0.0216 20 " 0.701
Molybdenum " ND 0.020 ND 20
Nickel " 2.99 0.020 3.02 20 1.12
Selenium " ND 0.040 ND 20
Silver " ND 0.0020 ND 20
Thallium " ND 0.0020 0.00226 20
Vanadium " 0.0596 0.010 0.0569 20 4.58
Zinc 0.367 0.010 0.361 20 " 1.50
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006363 - EPA 3005A
Matrix Spike (A006363-MS1) Source: 1002122-29 Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L 6.69 0.80 6.00 0.460 20 104 70-130
Antimony " 6.06 0.20 6.00 ND 20 101 54-147
Arsenic " 6.02 0.20 6.00 0.00406 20 100 54-148
Barium " 24.4 0.10 6.00 9.16 20 QM-4X 254 24-167
Beryllium " 6.16 0.040 6.00 0.0163 20 102 28-175
Cadmium " 6.02 0.040 6.00 0.0178 20 100 51-148
Chromium " 6.61 0.080 6.00 0.382 20 104 54-144
Cobalt " 8.45 0.040 6.00 2.22 20 104 46-151
Copper " 6.25 0.040 6.00 0.238 20 100 45-154
Lead 6.16 0.040 6.00 0.0216 20 " 102 50-154
Molybdenum " 6.03 0.040 6.00 ND 20 101 61-142
Nickel " 9.27 0.040 6.00 3.02 20 104 42-155
Selenium " 5.97 0.080 6.00 ND 20 99.4 52-148
Silver " 6.10 0.040 6.00 ND 20 102 17-167
Thallium " 5.70 0.040 6.00 0.00226 20 94.9 34-137
Vanadium " 6.29 0.20 6.00 0.0569 20 104 46-153
Zinc 6.44 0.20 6.00 0.361 20 " 101 33-160
Matrix Spike Dup (A006363-MSD1) Source: 1002122-29 Prepared: 21-Jun-10 Analyzed: 22-Jun-10 Titanium mg/L 6.71 0.80 6.00 0.460 20 104 0.302 70-130
Antimony " 6.15 0.20 6.00 ND 20 102 1.49 54-147
Arsenic " 5.91 0.20 6.00 0.00406 20 98.5 1.74 54-148
Barium " 23.3 0.10 6.00 9.16 20 QM-4X 236 7.18 24-167
Beryllium " 5.99 0.040 6.00 0.0163 20 99.6 2.78 28-175
Cadmium " 6.17 0.040 6.00 0.0178 20 103 2.46 51-148
Chromium " 6.58 0.080 6.00 0.382 20 103 0.542 54-144
Cobalt " 8.51 0.040 6.00 2.22 20 105 0.884 46-151
Copper " 6.32 0.040 6.00 0.238 20 101 1.08 45-154
Lead 6.21 0.040 6.00 0.0216 20 " 103 0.854 50-154
Molybdenum " 5.86 0.040 6.00 ND 20 97.7 2.87 61-142
Nickel " 9.38 0.040 6.00 3.02 20 106 1.64 42-155
Selenium " 5.92 0.080 6.00 ND 20 98.6 0.825 52-148
Silver " 4.71 0.040 6.00 ND 20 QR-02 78.5 25.7 17-167
Thallium " 5.73 0.040 6.00 0.00226 20 95.4 0.507 34-137 Vanadium " 6.24 0.20 6.00 0.0569 20 103 0.839 46-153
Zinc 6.48 0.20 6.00 0.361 20 " 102 0.633 33-160
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006371 - EPA 7470A Prep
Blank (A006371-BLK1) Prepared & Analyzed: 22-Jun-10
Mercury mg/L ND 0.00020
LCS (A006371-BS1) Prepared & Analyzed: 22-Jun-10
Mercury mg/L 0.0205 0.00020 0.0200 20 103 85-115
LCS Dup (A006371-BSD1) Prepared & Analyzed: 22-Jun-10
Mercury mg/L 0.0207 0.00020 0.0200 20 104 0.882 85-115
Duplicate (A006371-DUP1) Source: 1002062-01 Prepared & Analyzed: 22-Jun-10 Mercury mg/L ND 0.00020 ND 20
Matrix Spike (A006371-MS1) Source: 1002062-01 Prepared & Analyzed: 22-Jun-10 Mercury mg/L 0.00466 0.00020 0.0200 ND 20 QM-05 23.3 75-125 Matrix Spike Dup (A006371-MSD1) Source: 1002062-01 Prepared & Analyzed: 22-Jun-10 Mercury mg/L 0.00467 0.00020 0.0200 ND 20 QM-05 23.3 0.214 75-125 Batch A006372 - EPA 7471A Prep
Blank (A006372-BLK1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg ND 0.10
LCS (A006372-BS1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.63 0.10 1.67 20 97.6 85-115
LCS Dup (A006372-BSD1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.63 0.10 1.67 20 97.5 0.0615 85-115
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006372 - EPA 7471A Prep
Duplicate (A006372-DUP1) Source: 1002122-01 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 0.0827 0.10 0.102 20 QR-04 20.6
Matrix Spike (A006372-MS1) Source: 1002122-01 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.62 0.093 1.55 0.102 20 98.0 75-125
Matrix Spike Dup (A006372-MSD1) Source: 1002122-01 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.70 0.097 1.61 0.102 20 98.9 0.979 75-125 Batch A006373 - EPA 7471A Prep
Blank (A006373-BLK1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg ND 0.10
LCS (A006373-BS1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.70 0.10 1.67 20 102 85-115
LCS Dup (A006373-BSD1) Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.68 0.10 1.67 20 101 1.14 85-115
Duplicate (A006373-DUP1) Source: 1002122-12 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 0.0581 0.099 0.0517 20 11.8
Matrix Spike (A006373-MS1) Source: 1002122-12 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.91 0.097 1.61 0.0517 20 115 75-125
Matrix Spike Dup (A006373-MSD1) Source: 1002122-12 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Mercury mg/kg 1.90 0.10 1.66 0.0517 20 111 3.50 75-125
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006374 - EPA 3050B
Blank (A006374-BLK1) Prepared & Analyzed: 22-Jun-10
Titanium mg/kg ND 2.0
Antimony " ND 1.0
Arsenic " ND 0.20
Barium " ND 0.10
Beryllium " ND 0.50
Cadmium " ND 0.20
Chromium " ND 0.20
Cobalt " ND 0.20
Copper " ND 0.20
Lead ND 0.20 "
Molybdenum " ND 0.20
Nickel " ND 0.20
Selenium " ND 1.0
Silver " ND 0.20
Thallium " ND 1.0
Vanadium " ND 1.0
Zinc ND 0.50 "
LCS (A006374-BS1) Prepared & Analyzed: 22-Jun-10
Antimony mg/kg 15.9 1.0 15.0 20 106 85-115
Arsenic " 15.6 0.20 15.0 20 104 85-115
Barium " 14.9 0.10 15.0 20 99.6 85-115
Beryllium " 15.2 0.50 15.0 20 102 85-115
Cadmium " 15.0 0.20 15.0 20 100 85-115
Chromium " 15.0 0.20 15.0 20 100 85-115
Cobalt " 15.1 0.20 15.0 20 100 85-115
Copper " 15.1 0.20 15.0 20 101 85-115
Lead 15.0 0.20 15.0 20 " 99.9 85-115
Molybdenum " 15.0 0.20 15.0 20 100 85-115
Nickel " 15.2 0.20 15.0 20 101 85-115
Selenium " 15.4 1.0 15.0 20 103 85-115
Silver " 15.1 0.20 15.0 20 101 85-115
Thallium " 14.3 1.0 15.0 20 95.1 85-115
Vanadium " 14.9 1.0 15.0 20 99.6 85-115
Zinc 14.9 0.50 15.0 20 " 99.6 85-115
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006374 - EPA 3050B
LCS Dup (A006374-BSD1) Prepared & Analyzed: 22-Jun-10
Antimony mg/kg 15.6 1.0 15.0 20 104 1.58 85-115
Arsenic " 15.2 0.20 15.0 20 101 2.64 85-115
Barium " 14.9 0.10 15.0 20 99.3 0.280 85-115
Beryllium " 14.9 0.50 15.0 20 99.3 2.28 85-115
Cadmium " 15.1 0.20 15.0 20 100 0.394 85-115
Chromium " 14.9 0.20 15.0 20 99.4 0.746 85-115
Cobalt " 15.1 0.20 15.0 20 101 0.454 85-115
Copper " 15.3 0.20 15.0 20 102 0.954 85-115
Lead 15.0 0.20 15.0 20 " 100 0.202 85-115
Molybdenum " 14.9 0.20 15.0 20 99.3 0.996 85-115
Nickel " 15.2 0.20 15.0 20 101 0.324 85-115
Selenium " 14.9 1.0 15.0 20 99.5 3.01 85-115
Silver " 15.0 0.20 15.0 20 100 0.591 85-115
Thallium " 14.5 1.0 15.0 20 96.6 1.52 85-115
Vanadium " 14.8 1.0 15.0 20 98.5 1.09 85-115
Zinc 14.6 0.50 15.0 20 " 97.2 2.46 85-115
Duplicate (A006374-DUP1) Source: 1002122-12 Prepared: 22-Jun-10 Analyzed: 23-Jun-10 Titanium mg/kg 352 39 377 20 6.79
Antimony " ND 4.9 ND 20
Arsenic " 3.00 0.98 3.19 20 6.12
Barium " 124 0.49 122 20 1.58
Beryllium " ND 2.4 ND 20
Cadmium " ND 0.98 ND 20
Chromium " 37.2 0.98 38.3 20 2.74
Cobalt " 8.81 0.98 9.03 20 2.42
Copper " 15.9 0.98 16.2 20 2.02
Lead 5.73 0.98 5.94 20 " 3.49
Molybdenum " ND 0.98 ND 20
Nickel " 35.7 0.98 36.3 20 1.88
Selenium " ND 4.9 ND 20
Silver " ND 0.98 ND 20
Thallium " ND 4.9 ND 20
Vanadium " 38.4 4.9 37.8 20 1.59
Zinc 38.9 2.4 39.7 20 " 2.17
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Result Limit
Reporting
Units Level
Spike
Result
Source
%REC
%REC
Limits RPD
RPD
Analyte Limit Notes
Total Metals by EPA 6000/7000 Series Methods - Quality Control Batch A006374 - EPA 3050B
Matrix Spike (A006374-MS1) Source: 1002122-12 Prepared & Analyzed: 22-Jun-10 Antimony mg/kg 18.5 20 293 ND 20 6.30 0-88
Arsenic " 266 3.9 293 3.19 20 89.8 73-124
Barium " 442 2.0 293 122 20 109 18-166
Beryllium " 301 9.8 293 ND 20 103 76-132
Cadmium " 278 3.9 293 ND 20 94.8 82-118
Chromium " 318 3.9 293 38.3 20 95.4 58-139
Cobalt " 288 3.9 293 9.03 20 95.1 85-114
Copper " 291 3.9 293 16.2 20 93.7 64-138
Lead 292 3.9 293 5.94 20 " 97.8 61-138
Molybdenum " 198 3.9 293 ND 20 67.5 67-112
Nickel " 317 3.9 293 36.3 20 95.8 68-132
Selenium " 264 20 293 ND 20 90.2 66-132
Silver " 256 3.9 293 ND 20 87.3 18-153
Thallium " 268 20 293 ND 20 91.3 78-114
Vanadium " 310 20 293 37.8 20 92.9 80-119
Zinc 311 9.8 293 39.7 20 " 92.5 40-153
Matrix Spike Dup (A006374-MSD1) Source: 1002122-12 Prepared & Analyzed: 22-Jun-10 Antimony mg/kg 22.7 19 288 ND 20 QR-02 7.87 22.1 0-88
Arsenic " 261 3.8 288 3.19 20 89.6 0.224 73-124
Barium " 444 1.9 288 122 20 112 2.37 18-166
Beryllium " 295 9.6 288 ND 20 103 0.260 76-132
Cadmium " 287 3.8 288 ND 20 99.5 4.85 82-118
Chromium " 316 3.8 288 38.3 20 96.5 1.14 58-139
Cobalt " 287 3.8 288 9.03 20 96.5 1.43 85-114
Copper " 290 3.8 288 16.2 20 95.2 1.57 64-138
Lead 295 3.8 288 5.94 20 " 101 2.77 61-138
Molybdenum " 192 3.8 288 ND 20 QM-08 66.8 0.942 67-112
Nickel " 315 3.8 288 36.3 20 96.7 0.974 68-132
Selenium " 261 19 288 ND 20 90.7 0.508 66-132
Silver " 272 3.8 288 ND 20 94.5 7.94 18-153
Thallium " 272 19 288 ND 20 94.4 3.34 78-114
Vanadium " 309 19 288 37.8 20 94.2 1.47 80-119
Zinc 307 9.6 288 39.7 20 " 92.8 0.295 40-153
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. [none]
Wade Allmon
Watsonville
Santa Barbara CA, 93103 25-Jun-10 10:57
Oilfield Environmental and Compliance, INC.

Notes and Definitions
QR-04 The RPD exceeded the QC control limits.

QR-02 The RPD result exceeded the QC control limits; however, both percent recoveries were acceptable. Sample results for the QC batch were accepted based on percent recoveries and completeness of QC data.

QM-4X The spike recovery was outside of QC acceptance limits for the MS and/or MSD due to analyte concentration at 4 times or greater the spike concentration. The QC batch was accepted based on LCS and/or LCSD recoveries within the acceptance limits.

QM-08 The spike recovery was outside acceptance limits for the MS and/or MSD. The QC Batch was accepted based on LCS/LCSD percent recoveries and RPD values.

QM-05 The spike recovery was outside acceptance limits for the MS and/or MSD due to matrix interference. The LCS and/or LCSD were within acceptance limits showing that the laboratory is in control and the data is acceptable.

N-03 Analyte concentration above 20 X TCLP.

N-02 Analyte concentration below TTLC but above 10 X STLC.

N-01 Analyte concentration exceeds TTLC.

HoldX Sample holding time expired.

Sample results reported on a dry weight basis
RPD Relative Percent Difference
dry
NR Not Reported
ND Analyte NOT DETECTED at or above the reporting limit DET Analyte DETECTED
Oilfield Environmental and Compliance The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Oilfield Environmental and Compliance CHAIN-OF CUSTODY
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City/State/ZIP:

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Oilfield Environmental and Compliance
307 Roemer Way Suite 300, Santa Maria CA 93454
phone: (805) 922-4772 fax: (805) 925-3376 www.oecusa.com Highway 33, McKittrick CA
phone: (661) 762-9143
Project Name/#: ~~vr£1.e..

Site: ~Llc....

Analysis Requested

CHAIN OF CUSTODY
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Oilfield Environmental and Compliance
307 Roemer Way Suite 300, Santa Maria CA 93454
phone: (805) 922-4772 fax: (805) 925-3376 www.oecusa.com Highway 33, McKittrick CA
phone: (661) 762-9143
Company: ~ /(JJJ..~ Project Name/#: '1J ~K,.vlk
Site: ~~vafLA.

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Oilfield Environmental and Compliance CHAIN OF CUSTODY
307 Roemer Way Suite 300, Santa Maria CA 93454 Highway 33, McKittrick CA phone: (805) 922-4772 fax: (805) 925-3376 www.oecusa.com phone: (661) 762-9143 Page S-- of _4~- Company:

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Company: ~
Oilfield Environmental and Compliance
307 Roemer Way Suite 300, Santa Maria CA 93454
phone: (805) 922-4772 fax: (805) 925-3376 www.oecusa.com Highway 33, McKittrick CA
phone: (661) 762-9143
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CHAIN OF CUSTODY

Special Instructions:

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tt•~.~PLE RECEIPT CUENT: ft.}adeAl/mofl OECID#: Temp: ifJ ° C coc RECEIVED t L RECEIPT LOGIN I ~ 1 .... } /1 0
DATEfflME: {, I 'f I 0 Jt./I 0 DATFJTIME: ~/,-. ~~~~}~--#-~~~~~- Acceptable lbqe: U"C to 6"C
0'151 REFRIGERA TOR(s): $
SAMPLE TRANSPORT, RECEIPT, CONDITION & PRESERVATION: ef No NIA (*) PROBLEM CHAIN FORM NEEDED D OEC Courier/Sampler COC document(s) received with samples D• D Custody Seals (circle): Pres~ ~very(Olher than OEC Courier) Correct containers for analysis requested ~ D• D Samples I Coolers
Samples Received on Ice Container(s) intact and in good condition D• D Intact I Broken• D Samples Received Outside Temp. Range• Container label(s) consistent with COC ~ D• ~ Method of Shipment & Tracking #or llf>plicable):

D Samples Direct from field (Outside Temp) OEC preservative added ( .. note std ID) Ou 0 D After-Hours Outside Drop-otT[Brought Inside) Proper preservation on sample label(s) D D ~ ( .. ) OEC Preservative ID:
(Initials/Date/Time): VOA containers free ofheadspace 0 O• Dissolved Metals Filtration: tDate/lnit!Prcscrve IDl Tedlar B_11gs free of condensation D D• ~
CONTAINERS, COC CHANGES AND/OR CORRECTIONS CHANGES AUTHORIZED BY:

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~C/-JJA- J ... f /J z. l!io I ti fl/JO~ - t:47 :;P.-_:n), /..., l/c-i q/Jss - - sU!t n 'I .., RECEIPT LOGIN BY: -....,.,,...dbJ-=--· _· ___ _ RECEIPT REVIEWED BY:----~___,.~-- Pagc__/_orL Page 1050 of 1256 Oilfield Environmental and Compliance, INC.

Dear Client:

Enclosed is an analytical report for the above referenced project. The samples included in this report were received on 22-May-10 17:00 and analyzed in accordance with the attached chain-of-custody.

Unless otherwise noted, all analytical testing was accomplished in accordance with the guidelines established in our Quality Assurance Manual, applicable standard operating procedures, and other related documentation. The results in this analytical report are limited to the samples tested and any reproduction thereof must be made in its entirety.

If you have any questions regarding this report, please do not hesitate to contact the undersigned.

Sincerely,
Work Order: 1001778
02 June 2010

DATA SUBJECT TO CHANGE

DRAFT REPORT
Wade Allmon
1309 Morrison Ave.

Santa Barbara, CA 93103
RE: Santa Barbara County Litigation Project
Wade Allmon
307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. Watsonville
Wade Allmon
Santa Barbara County Litigation Project
Santa Barbara CA, 93103 02-Jun-10 17:03
Oilfield Environmental and Compliance, INC.

Sample ID Laboratory ID Matrix Date Sampled

ANALYTICAL REPORT FOR SAMPLES
Date Received
DRAFT: Y1-B8 1001778-01 20-May-10 13:48 22-May-10 17:00 Solid DRAFT: Y1-C6 1001778-02 20-May-10 14:22 22-May-10 17:00 Solid DRAFT: Y2-C2 1001778-03 20-May-10 16:12 22-May-10 17:00 Solid DRAFT: Y2-D2 1001778-04 20-May-10 16:18 22-May-10 17:00 Solid DRAFT: Y3-G2 1001778-05 20-May-10 19:10 22-May-10 17:00 Solid DRAFT: Y3 -H4 1001778-06 20-May-10 19:12 22-May-10 17:00 Solid DRAFT: Y4-B2 1001778-07 21-May-10 10:03 22-May-10 17:00 Solid DRAFT: Y4 -C4 1001778-08 21-May-10 10:10 22-May-10 17:00 Solid DRAFT: Y5-D2 1001778-09 21-May-10 11:43 22-May-10 17:00 Solid DRAFT: Y5-E2 1001778-10 21-May-10 11:47 22-May-10 17:00 Solid DRAFT: Y6-C2 1001778-11 21-May-10 12:52 22-May-10 17:00 Solid DRAFT: Y7-B2 1001778-12 21-May-10 13:55 22-May-10 17:00 Solid DRAFT: Y8-B2 1001778-13 21-May-10 14:00 22-May-10 17:00 Solid DRAFT: Y9-C6 1001778-14 21-May-10 16:16 22-May-10 17:00 Solid DRAFT: Y10-B4 1001778-15 21-May-10 18:00 22-May-10 17:00 Solid DRAFT: Y11-B2 1001778-16 21-May-10 19:06 22-May-10 17:00 Solid DRAFT REPORT The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.

307 Roemer Way, Suite 300, Santa Maria, CA 93454
TEL: (805) 922-4772
www.oecusa.com FAX: (805) 925-3376

Project:

Project Number:

Project Manager:

Reported:

Wade Allmon
1309 Morrison Ave. Watsonville
Wade Allmon
Santa Barbara County Litigation Project
Santa Barbara CA, 93103 02-Jun-10 17:03
Oilfield Environmental and Compliance, INC.

Analyte Result
Limit Reporting Prepared Analyzed Method Notes Units Dilution Batch DRAFT: Y1-B8
1001778-01 (Solid)
DRAFT: Wet Chemistry by EPA or APHA Standard Methods
pH 6.65 0.100 pH Units 1 A005394 22-May-10 22-May-10 9045 HoldX DRAFT: Total Metals by EPA 6000/7000 Series Methods
Antimony 5.0 ND mg/kg 5 A005439 31-May-10 01-Jun-10 EPA 6020 Arsenic 18 1.0 " " "" " "
Barium 180 2.0 " 20 " " 02-Jun-10 "
Beryllium 2.5 ND " 5 " " 01-Jun-10 "
Cadmium 1.6 1.0 " " "" " "
Chromium 62 1.0 " " "" " " N-02
Cobalt 13 1.0 " " "" " "
Copper 94 1.0 " " "" " "
Lead 750 10 " 50 " " 02-Jun-10 " N-02, N-03
Mercury 0.24 0.090 " 1 A006002 01-Jun-10 01-Jun-10 EPA 7471A Molybdenum 1.0 ND " 5 A005439 31-May-10 01-Jun-10 EPA 6020 Nickel 60 1.0 " " "" " "
Selenium 5.0 ND " " " "" "
Silver 1.0 ND " " " "" "
Thallium 5.0 ND " " " "" "
Titanium 280 40 mg/L 20 " " 02-Jun-10 "
Vanadium 36 5.0 mg/kg 5 " " 01-Jun-10 "
Zinc 700 25 " 50 " " 02-Jun-10 "
DRAFT REPORT The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety.