## SOURCE TEST REPORT

Total and Hexavalent Chromium Emissions From Walker's Custom Chrome Decorative Chromium Plating Tank

MONITORING AND LABORATORY DIVISION STATIONARY SOURCE TESTING BRANCH

FILE NO: 06-05



### DATE: July 5, 2006

APPROVED: 

# fJ~/~"T& David Todd, Field Engineer Source Test Section 

# fJ~no~~~
Source Test Section 

# tv\~T~- ~ Manjit Ahl}Ja, Chief" 

### Stationary Source Testing Branch This report has been reviewed by the staff of the California Air Resources Board (ARB) and approved for publication. Approval does not signify that the contents necessarily reflect the views and policies of the ARB, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.

### ACKNOWLEDGEMENTS

The project leader was Shobna Sahni assisted by Carla Takemoto and Robert Barrera with ARB Stationary Source Division. The sampling team was led by David Todd and included Angus MacPherson and Dan Leon with the ARB MLD and Robert Barrera with ARB Stationary Source Division. Roxana Walker and Peter Samra with MLD Northern Laboratory Branch conducted the laboratory analysis. Dominick Nole and Paramo Hernandez with Alta Plating provided chrome plating assistance and expertise. Paramo Hernandez of Alta Plating also provided onsite analyses for plating bath surface tension. Additional plating bath analysis was provided by Anachem.

This report presents results based on samples collected and analyzed by the ARB staff using ARB test methods. The results have been reviewed by the staff and are believed to be accurate within the limits of the methods. However, data may have been affected by variables that were not known to staff during sampling and review.Page i 

### California Environmental Protection Agency AIR RESOURCES BOARD Monitoring and Laboratory Division

TABLE OF CONTENTS
I. INTRODUCTION

.............................................................................................................. 1 II. PROCESS DESCRIPTION

............................................................................................. 1 III. WALKER'S CUSTOM CHROME SOURCE TEST

...................................................... 2 IV. TEST METHODS

............................................................................................................. 5 V. QUALITY ASSURANCE/QUALITY CONTROL

........................................................... 7 VI. TEST RESULTS

............................................................................................................... 8

FIGURES FIGURE II-1: Dummy Parts for Electroplating

...................................................................... 2 FIGUREIII-1: ARB Capture Hood

............................................................................................ 3 FIGURE III-2: ARB Sampling Location

.................................................................................... 4

TABLES TABLE VI. ARB Test Results

................................................................................................. 9

APPENDICES A. ARB Sampling Results B. ARB Laboratory Results C. Field Data SheetsPage ii (This page is blank.)Page 1 

### California Environmental Protection Agency AIR RESOURCES BOARD Monitoring and Laboratory Division


## Total and Hexavalent Chromium Emissions from

Walker’s Custom Chrome Decorative Chromium Plating Tank

I. INTRODUCTION At the request of the Air Resources Board (ARB) Stationary Source Division (SSD), staff of the Monitoring and Laboratory Division (MLD) performed emissions testing of a decorative chrome electroplating tank operated by Walker’s Custom Chrome located at 2145 Grand Coulee Blvd. in Shasta Lake, California. Total and hexavalent chromium emissions testing was conducted from February 15 through February 23, 2006.
II. PROCESSDESCRIPTION Walker’s Custom Plating performs decorative chromium plating on a variety of small parts including decorative automobile parts. Walker’s decorative chrome plating tank has a capacity of about 500 gallons and is 96 inches long, 29 inches wide, and 42 inches deep. The plating tank is equipped with its own rectifier, and amperage and voltage into the tank varies with the type and area of the parts to be plated. Plating bath temperature was maintained at approximately 95 - 105°F during plating operations. SSD staff periodically collected voltage, amperage, bath temperature, and amp-hour readings for the plating tank during the source test. Emissions from the plating tank are controlled through the use of a chemical fume suppressant, Fumetrol 140, a South Coast Air Quality Management District (SCAQMD) certified fume suppressant for chromium electroplating. Chemical fume suppressants are used in plating baths to change the surface tension and reduce chromic acid mist that is generated during plating operations. No plating tank ventilation system or additional emissions controls are used (i.e. HEPA filter) at Walker’s. Any emissions from the tank are emitted into the building and subsequently vented out through open doors, windows, and vents. As mentioned above, Walker’s normally performs decorative plating on a variety of small parts. Normal usage is about 40 to 60 amp-hours per day for about two or threedays a week. For this source test decorative plating was increased to about 300 amphours per sample run (day) to insure a measured amount of chromium was collected. Dummy parts were plated instead of Walker’s normal production. The dummy parts were hollow metal tubes about 36 inches long and either 1.5 inches in diameter or 1.5 by 1.5 inches square. Both types were used at five to six dummies at a time. Examples of the dummy parts are shown in Figure II-1. A total of 30 dummy parts were plated forPage 2



### each of three sample runs (W-11, W-12, and W-13). A fourth sample run (W-14) was collected without any chromium electroplating in the tank.

Fig II-1: A sample of the dummy parts chromium electroplated during emissions sampling.

III. WALKER’S CUSTOM CHROME SOURCE TEST The source test consisted of four individual sample runs. Three sample runs were collected from Walker’s decorative chrome plating tank on February 15, 16 and 17, 2006. During these sample runs the surface tension of the plating solution was about 35 dynes/cm which is a normal operating condition for this facility. A fourth “blank” sample run was collected February 23, 2006, while the plating tank remained “idle.”Page 3



### ARB Method 425 was used to determine hexavalent and total chromium emissions collected during the source tests. Each sample was collected continuously over a four-hour period except the first sample (W-11) which was collected over a two -hour period. During sampling, “dummy” parts were plated in the tank. The dummy parts were necessary to obtain a target of about 300 amp-hours per run. Walker’s Custom Chrome staff prepared each dummy part for plating, including stripping, each time a part reentered the plating tank. ARB staff built a ventilation system to carry any chromium emitted by the plating tank to the source sampling area,(See Figures III-1 and III-2.). This ventilation system consisted of a capture hood with an open bottom, open front, and plastic sheeting on three sides and the top. A 12-inch diameter exhaust duct near the top back center of

Fig III-1: Walker’s decorative chromium plating tank with ARB capture hood and ducting.

the capture hood carried plating tank emissions from the tank and capture hood through a sample collection area and then out toward an exit door. Surfaces of the hood and duct assembly were made of plastic sheeting and PVC flex hose and rigid tubing. This system was designed to allow droplets to return to the tank but collect fumes thatPage 4



### floated above the tank. Per SCAQMD’s procedures for plating tanks and fume suppressant certification, the average "lift" velocity between the tank and the ventilation system was designed to be less than 50 feet/minute.

Fig. III-2: ARB sampling location including vertical sampling pipe (12-inch diameter) and sample collection setup.
The capture hood was suspended above and around the plating tank by PVC pipes. When suspended and in use, the bottoms of the capture hood plastic sidewalls overlapped the back and sides of the plating tank. The open front of the capture hood was high enough and wide enough to allow plating parts to be placed in the tank without interference. “Smoke” sticks were used before and during sample runs to prove there was no emissions "leakage" out of the hood, including the open front. That “smoke,” titanium oxides and hydrochloric acid does not interfere with ARB Method 425 sample collection and analysis. 12" Duct

Sampling console Sample probe and support Sampling

Sample Impinger BoxPage 5



### Flexible and rigid (straight) 12-inch diameter PVC pipe directed tank emissions from the capture hood to the ARB Method 425 sample collection area. Method 425 samples were collected from a vertical (12-inch diameter, 67 inches long) PVC pipe sitting on the inlet to a fan box. Samples were collected from two, three-inch diameter holes cut 90 degrees apart into the vent stack and located 18 inches (11⁄2 duct diameters) above the fan box and 49 inches (four duct diameters) below the flexible pipe connected to the capture hood. The fan box includes a variable flow controlled fan with a 5-foot, 12-inch diameter PVC rigid pipe to exhaust tank emissions. IV. TEST METHODS
A. Source Sampling Procedures Samples were collected and recovered by ARB’s Stationary Source Testing Branch. Stack and duct flows were determined by ARB Stationary Source Test Method 1 (velocity traverse), Method 2 (stack velocity and flow rate), Method 3 (stack gas dry molecular weight), and Method 4 (moisture content). For Method 3, atmospheric concentrations of carbon dioxide, nitrogen, and oxygen were used to determine dry molecular weight. Hexavalent and total chromium samples were collected isokinetically in accordance with ARB draft Method 425, “Determination of Total Chromium and Hexavalent Chromium Emissions from Stationary Sources.” ARB Method 425 was originally adopted January 22, 1987, and amended July 28, 2002. For chromium sampling at Walker’s there were some approved modifications to ARB Method 425. These include the use of unheated sample lines and probes, the use of 0.1 N sodium bicarbonate impinger solution in place of 0.1 N sodium hydroxide solution, and deletion of the sample train filter and filter heater. Each test day consisted of a four-hour run using a single sample train, except for the first run which was only two hours. During the first run (Run W-11), 300 amp-hours of plating were unexpectedly completed within two hours. As a result, that run was reduced to two hours and only one diameter was traversed. The chromium sampling train consisted of a 48-inch glass-lined stainless steel probe with a 3/8-inch diameter glass nozzle, and attached Pitot tube and thermocouple assembly for monitoring stack conditions. A ten-foot Teflon  line connected the probe to three Greenburg-Smith impingers used to collect and stabilize any chromium sample. The first two impingers contained 100 milliliters each of 0.1 normal (N) sodium bicarbonate solution. A third, empty impinger was followed by a cylinder of silica gel (final moisture collection), and a 25-foot umbilical line connected to an isokinetic (Method 5) sampling console. The sampling console includes aPage 6



### vacuum pump, a dry gas meter, and additional monitors and controls for collecting a sample isokinetically. In accordance with Method 1, the sampling location required 24 traverse points (12 sampling points on each diagonal ninety degrees apart). As indicated above, Run W-11 was on only one diagonal. All the other sample runs including the blank (Run W-14) were completed using two diagonals. In accordance with Method 2, thermocouples and Type S Pitot tubes bundled with the sampling probes were used to determine stack velocity. The weight of the impinger solutions and silica gel were recorded before and after each test in order to obtain the moisture content of the stack gas in accordance to Method 4. In addition, stack temperature, ambient temperature, and barometric pressure were measured and recorded during each sample run. Leak checks in accordance with Method 5 were performed on each sample train and Pitot tube setup before and after each sample collection. Leak check results were documented on the Method 425 run sheets. After sampling, rinses of the sampling train nozzle, probe and transfer line, as well as the catch from the impingers, were recovered into three, 500-ml glass sample jars as follows (all sample jars were pre-cleaned and tested to ensure the absence of chromium prior to the source test):

• Container 1 - rinses from the nozzle, sample probe, and transfer line;

• Container 2 – first impinger catch; and

• Container 3 – second and third impinger catches. The pH of the sodium bicarbonate solution used for the probe rinse and impingers was maintained at ≥8.0. Additionally, the impinger solution was chilled with ice to 4°C (39° F) or less during sample collection. All samples were also chilled with ice and refrigeration to 4 °C (39° F) or less during transport and storage prior to analysis to minimize the conversion of hexavalent chromium to trivalent chromium. During sample recovery prior to analysis, disposable vinyl gloves were worn to help prevent contamination. At the conclusion of each sampling week, staff transported the collected samples to the laboratory for storage and analyses. Amperage and voltage supplied by the rectifier was monitored by SSD staff during the source test runs. SSD staff also monitored tank temperature and totalizer amp-hours. In addition, plating bath samples were collected for laboratory analysis to determine plating bath surface tension and chromic acid content.
B. Analytical Procedures Laboratory analyses for hexavalent and total chromium of the collected stack samples was performed by ARB’s Northern Laboratory Branch. Hexavalent chromium (also known as hex chrome, Cr (VI), or Cr +6

### ) was measured using ionPage 7



### chromatography (IC) in accordance with ARB standard operating procedure (SOP) MLD039. The limit of detection (LOD) of the analytical procedure for hexavalent chromium is 0.2 nanograms per milliliter (ng/ml). Total chromium was determined using an atomic absorption/ graphite furnace (GFAA) technique using ARB SOP MLD005. The LOD of the analytical procedure for total chromium is 1.0 ng/ml.

V. QUALITY ASSURANCE / QUALITY CONTROL To ensure that collected data are consistent, relevant, and defensible, appropriate field and laboratory Quality Assurance (QA) procedures were followed throughout the source test. A detailed explanation of the ARB’s standard field and laboratory QA procedures are contained in ARB Quality Assurance manuals, Stationary Source Test Methods, and laboratory SOPs. As required by ARB Method 425, all surfaces that came into contact with a sample were either glass or Teflon 

### and were pre-cleaned using the following procedure:

• the glassware and Teflon  lines were first washed with detergent;

• soaked with a 10% solution of nitric acid for several hours;

• flushed with liberal amounts of tap water;

• rinsed with de-ionized water; and

• rinsed with 0.1 N sodium bicarbonate solution. Extra pre-cleaned equipment was deployed to ensure that no equipment needed to be re-cleaned or re-used during field sampling. A blank source test (Run W-14) sample was collected at Walker’s with the ARB capture hood and ducting after sampling. Run W-14 was collected similar to runs W-12 and W-13. No changes were made to the sampling results based upon the results of Run W-14. The Type S Pitot tubes used for stack velocity determinations met the required specifications for a baseline coefficient of 0.84 as specified in ARB Method 2. The console assembly, including Pitot tubes, passed leak checks before and after each velocity determination. In addition, all sampling train assemblies passed leak checks before and after each sample run. All test samples were collected using iced impinger sets. After recovery, samples were placed on ice to maintain their temperature at or below 4 °C (39 ° F) as required by ARB Method 425. Collected and recovered samples remained on ice while on site and during transport to the laboratory for analyses. Staff of the Northern Laboratory Branch ensured that the samples were maintained at or below 4 °C (39 ° F) in a sample refrigerator while awaiting analysis.Page 8



### During sample collection and transport, the pH of the sodium bicarbonate solution used for the probe rinse and impinger charging was maintained at ≥8.0 as required by Method 425. This is necessary to ensure that any collected hexavalent chromium is not reduced to trivalent chromium. The pH of the impinger solutions and sample train rinses were checked before sampling and during sample recovery. Chain of custody was maintained for all collected samples. A chain of custody sheet was prepared for each sample run.
VI. TEST RESULTS Results of the ARB Method 425 source tests for Walker’s Custom Chrome decorative chromium plating tank are presented in Table VI-1. Chromium emission rates ranged from 0.0050 to 0.016 milligrams per amp-hour (mg/amp-hr) for total chromium and 0.0037 to 0.012 mg/amp-hr for hexavalent chromium at a surface tension of about 35 dynes/cm. Emissions data and calculations are in Appendix A. Laboratory results are presented in Appendix B. There seems to be a significant difference in the emissions measured with Run W-11 compared to emissions measured with Runs W-12 and W-13. The reason for the difference is not known. Run W-11 sampled for two hours on a single traverse compared to four hours sampling on two traverses, 90o 

### apart, for each of the other two sample runs. For Run W-11, amp-hours were higher and surface tension slightly lower than for Runs W-12 and W-13.Page 9 Table VI Walker’s Custom Chrome Chromium Plating Tank Sampling Dates – February 15-23, 2006 Sampling Location Sample Number W-11 W-12 W-13 Sampling Date 2/15/06 2/16/06 2/17/06 Plating Tank Data Totalizer (amp-hours) 331 300 300 Production Rate (amp-hrs/hr) 165.5 75 75 Freeboard (inches to overflow) 4.75 4.5 5 Surface Tension (dynes/cm) 35.1 35.4 35.4 Chromic Acid Conc. (oz/gal) 34.8 34.8 34.8 Bath Temperature (oF) 90-100 92-105 98-107

Stack Data Stack Temperature ( 0F) 65 61 61 Velocity (ft/sec) 19.2 20.2 21.6 Static Pressure ("H 20) -0.26 -0.24 -0.25 Stack Area (sq. ft.) 0.785 0.785 0.785 Flow Rate (DSCFM) 899 958 1000 Moisture (% of v/v) 0.7 0.5 0.9 Sampling Data Sampling Time (minutes) 120 240 240 Sample Volume (DSCF) 110.56 233.10 235.72 Chromium Data (ng/sample) Total Chromium 1700 5090 4680 Hexavalent Chromium 1262 3232 3610 Isokinetic Rate (%) 105 104 101
EMISSIONS Concentration (ng/dscm) Total Chromium 543 771 701 Hexavalent Chromium 403 490 541 Emission Rate (mg/hr) Total Chromium 0.83 1.25 1.19 Hexavalent Chromium 0.62 0.80 0.92 Emissions Factors (mg/amp-hr) Total Chromium 0.0050 0.017 0.016 Hexavalent Chromium 0.0037 0.011 0.012 Standard Conditions = 68oF and 29.92 in. Hg. DSCF = dry standard cubic feet. DSCM = dry standard cubic meter. DSCFM = dry standard cubic feet per minute.(This page is blank.)

## Appendix A
ARB Sampling Results(This page is blank.)A-1 MONITORING & LABORATORY DIVISION STATIONARY SOURCE TEST BRANCH

TEST SUMMARY AND RESULTS (FOR FIELD DATA RECORD)

FILE NO.: 06-05 PROJECT NAME: Walker's Chrome RUN NO.: W-11

SUMMARY OF TEST DATA

--------------------- Volume of Gas Sampled (Vm): 111.72 cubic feet Vm Meter Cal. Factor (Y) 0.973 Meter Temperature (Tm): 520 deg. R Barometric Pressure (Pb): 29.79 inches Hg Avg. delta H Orifice Press. (dH avg): 2.442 inches H2O Pb + dH avg: 29.97 inches Hg. O2 in Stack (%O2): 20.90 percent CO in Stack (%CO): 0.0000 percent CO2 in Stack (%CO2): 0.00 percent N2 in Stack (%N2): 79.10 percent Pitot Tube Factor (Cp) 0.84 Avg. of Sqrt. of Pitot Press. (/dP avg): 0.34 /(inches H2O) Stack Temperature (Ts) 525 deg. R Static Pressure -0.26 inches H2O Absolute Stack Pressure (Ps) 29.77 inches Hg Stack Dimensions 12 inches dia. Stack Area (As) 0.785 square feet H2O in Impingers and Silica Gel (Vlc): 16.7 milliliters Sampling Time (t): 120 minutes Nozzle Diameter (Dn): 0.375 inches Total Chromium Mass Collected (Mn): 1,700 nanograms Hexavalent Cr. Mass Collected (Mn): 1,262 nanograms

CALCULATED RESULTS

------------------- Corrected Sample Volume (Vm std): 110.56 DSCF (68 deg.F) Water Vapor in Stack (Bws): 0.7 percent by volume Stack Gas Molecular Wt, Dry (Md): 28.84 lb/lbmole Stack Gas Molecular Wt, Wet 28.76 lb/lbmole Stack Gas Velocity (Vs): 19.20 feet/second Stack Gas Flow Rate (Qs): 899 DSCFM(68 deg.F) Isokinetic Ratio (%I): 105.0 percent Total Cr Mass Conc. (Cs): 15.376453 nanograms/dscf Hex. Cr. Mass Conc. (Cs): 11.414755 nanograms/dscf Total Cr Mass Conc: 543 nanograms/dscm Hex. Cr. Mass Conc: 403 nanograms/dscm Total Cr. Emission Rate (Wm): 0.83 milligrams/hr Total Cr. Hex. Cr. Emission Rate (Wm): 0.62 milligrams/hr Hex. Cr. During Run W-11 plating was twice as fast as designed. As a result the test run was 2 hours instead of 4 and only one diagonal was sampled instead of two.A-2 MONITORING & LABORATORY DIVISION STATIONARY SOURCE TEST BRANCH

TEST SUMMARY AND RESULTS (FOR FIELD DATA RECORD)

FILE NO.: 06-05 PROJECT NAME: Walker's Chrome RUN NO.: W-12

SUMMARY OF TEST DATA

--------------------- Volume of Gas Sampled (Vm): 234.74 cubic feet Vm Meter Cal. Factor (Y) 0.973 Meter Temperature (Tm): 520 deg. R Barometric Pressure (Pb): 29.87 inches Hg Avg. delta H Orifice Press. (dH avg): 2.758 inches H2O Pb + dH avg: 30.07 inches Hg. O2 in Stack (%O2): 20.90 percent CO in Stack (%CO): 0.0000 percent CO2 in Stack (%CO2): 0.00 percent N2 in Stack (%N2): 79.10 percent Pitot Tube Factor (Cp) 0.84 Avg. of Sqrt. of Pitot Press. (/dP avg): 0.36 /(inches H2O) Stack Temperature (Ts) 521 deg. R Static Pressure -0.24 inches H2O Absolute Stack Pressure (Ps) 29.85 inches Hg Stack Dimensions 12 inches dia. Stack Area (As) 0.785 square feet H2O in Impingers and Silica Gel (Vlc): 26.7 milliliters Sampling Time (t): 240 minutes Nozzle Diameter (Dn): 0.375 inches Total Chromium Mass Collected (Mn): 5,090 nanograms Hexavalent Cr. Mass Collected (Mn): 3,232 nanograms

CALCULATED RESULTS

------------------- Corrected Sample Volume (Vm std): 233.10 DSCF (68 deg.F) Water Vapor in Stack (Bws): 0.5 percent by volume Stack Gas Molecular Wt, Dry (Md): 28.84 lb/lbmole Stack Gas Molecular Wt, Wet 28.78 lb/lbmole Stack Gas Velocity (Vs): 20.21 feet/second Stack Gas Flow Rate (Qs): 958 DSCFM(68 deg.F) Isokinetic Ratio (%I): 103.9 percent Total Cr Mass Conc. (Cs): 21.836082 nanograms/dscf Hex. Cr. Mass Conc. (Cs): 13.865269 nanograms/dscf Total Cr Mass Conc: 771 nanograms/dscm Hex. Cr. Mass Conc: 490 nanograms/dscm Total Cr. Emission Rate (Wm): 1.25 milligrams/hr Total Cr. Hex. Cr. Emission Rate (Wm): 0.80 milligrams/hr Hex. Cr.A-3 MONITORING & LABORATORY DIVISION STATIONARY SOURCE TEST BRANCH

TEST SUMMARY AND RESULTS (FOR FIELD DATA RECORD)

FILE NO.: 06-05 PROJECT NAME: Walker's Chrome RUN NO.: W-13

SUMMARY OF TEST DATA

--------------------- Volume of Gas Sampled (Vm): 242.52 cubic feet Vm Meter Cal. Factor (Y) 0.973 Meter Temperature (Tm): 520 deg. R Barometric Pressure (Pb): 29.22 inches Hg Avg. delta H Orifice Press. (dH avg): 2.925 inches H2O Pb + dH avg: 29.44 inches Hg. O2 in Stack (%O2): 20.90 percent CO in Stack (%CO): 0.0000 percent CO2 in Stack (%CO2): 0.00 percent N2 in Stack (%N2): 79.10 percent Pitot Tube Factor (Cp) 0.84 Avg. of Sqrt. of Pitot Press. (/dP avg): 0.38 /(inches H2O) Stack Temperature (Ts) 521 deg. R Static Pressure -0.25 inches H2O Absolute Stack Pressure (Ps) 29.20 inches Hg Stack Dimensions 12 inches dia. Stack Area (As) 0.785 square feet H2O in Impingers and Silica Gel (Vlc): 44.7 milliliters Sampling Time (t): 240 minutes Nozzle Diameter (Dn): 0.375 inches Total Chromium Mass Collected (Mn): 4,680 nanograms Hexavalent Cr. Mass Collected (Mn): 3,610 nanograms

CALCULATED RESULTS

------------------- Corrected Sample Volume (Vm std): 235.72 DSCF (68 deg.F) Water Vapor in Stack (Bws): 0.9 percent by volume Stack Gas Molecular Wt, Dry (Md): 28.84 lb/lbmole Stack Gas Molecular Wt, Wet 28.74 lb/lbmole Stack Gas Velocity (Vs): 21.63 feet/second Stack Gas Flow Rate (Qs): 1000 DSCFM(68 deg.F) Isokinetic Ratio (%I): 100.6 percent Total Cr Mass Conc. (Cs): 19.854152 nanograms/dscf Hex. Cr. Mass Conc. (Cs): 15.314848 nanograms/dscf Total Cr Mass Conc: 701 nanograms/dscm Hex. Cr. Mass Conc: 541 nanograms/dscm Total Cr. Emission Rate (Wm): 1.19 milligrams/hr Total Cr. Hex. Cr. Emission Rate (Wm): 0.92 milligrams/hr Hex. Cr.A-4 MONITORING & LABORATORY DIVISION STATIONARY SOURCE TEST BRANCH

TEST SUMMARY AND RESULTS (FOR FIELD DATA RECORD)

FILE NO.: 06-05 PROJECT NAME: Walker's Chrome RUN NO.: W-14

SUMMARY OF TEST DATA

--------------------- Volume of Gas Sampled (Vm): 230.59 cubic feet Vm Meter Cal. Factor (Y) 0.973 Meter Temperature (Tm): 520 deg. R Barometric Pressure (Pb): 29.42 inches Hg Avg. delta H Orifice Press. (dH avg): 2.708 inches H2O Pb + dH avg: 29.62 inches Hg. O2 in Stack (%O2): 20.90 percent CO in Stack (%CO): 0.0000 percent CO2 in Stack (%CO2): 0.00 percent N2 in Stack (%N2): 79.10 percent Pitot Tube Factor (Cp) 0.84 Avg. of Sqrt. of Pitot Press. (/dP avg): 0.37 /(inches H2O) Stack Temperature (Ts) 532 deg. R Static Pressure -0.24 inches H2O Absolute Stack Pressure (Ps) 29.40 inches Hg Stack Dimensions 12 inches dia. Stack Area (As) 0.785 square feet H2O in Impingers and Silica Gel (Vlc): 26.6 milliliters Sampling Time (t): 240 minutes Nozzle Diameter (Dn): 0.375 inches Total Chromium Mass Collected (Mn): 1,010 nanograms Hexavalent Cr. Mass Collected (Mn): 317 nanograms

CALCULATED RESULTS

------------------- Corrected Sample Volume (Vm std): 225.53 DSCF (68 deg.F) Water Vapor in Stack (Bws): 0.6 percent by volume Stack Gas Molecular Wt, Dry (Md): 28.84 lb/lbmole Stack Gas Molecular Wt, Wet 28.78 lb/lbmole Stack Gas Velocity (Vs): 20.92 feet/second Stack Gas Flow Rate (Qs): 956 DSCFM(68 deg.F) Isokinetic Ratio (%I): 100.7 percent Total Cr Mass Conc. (Cs): 4.4784383 nanograms/dscf Hex. Cr. Mass Conc. (Cs): 1.4056089 nanograms/dscf Total Cr Mass Conc: 158 nanograms/dscm Hex. Cr. Mass Conc: 50 nanograms/dscm Total Cr. Emission Rate (Wm): 0.26 milligrams/hr Total Cr. Hex. Cr. Emission Rate (Wm): 0.08 milligrams/hr Hex. Cr. Run W-14 was run similar to W-12 and W-13 but without any plating in the tank during Run W-14. Amp-hours and amp-hours/hour were zero and bath temperature was 104 oF.

## Appendix B
Laboratory Results(This page is blank.)B-1



## Chromium Source Testing Results Project: Walker's Custom Chrome Sample Collection: February 2006
Probes and Impingers

ml of sample Total Cr Total Cr Cr(VI) Cr(VI) Cr (VI) as Sample ID collected ng/ml ng recovered ng/ml ng recovered % of Total Cr

W11-P 82.7 13.0 1100 8.2 680 61.8% W11-I1 104.6 5.7 600 5.3 550 91.7% W11-I2 105.7 <1.0 <110 0.3 32 Totals: 1,700 1,262 74.2% W12-P 78.6 54.0 4300 33.0 2600 60.5% W12-I1 93.2 7.3 680 6.3 590 86.8% W12-I2 103.8 1.1 110 0.4 42 38.2% Totals: 5,090 3,232 63.5% W13-P 103.0 28.0 2900 18.0 1900 65.5% W13-I1 106.1 15.0 1600 15.0 1600 100.0% W13-I2 105.1 1.7 180 1.0 110 61.1% Totals: 4,680 3,610 77.1% W14-P 73.8 8.7 640 2.7 200 31.3% W14-I1 93.8 2.5 230 0.7 66 28.7% W14-I2 101.3 1.4 140 0.5 51 36.4% Totals: 1,010 317 31.4% The limit of detection (LOD) for Cr by GFAA is 1.0 ng/ml. The LOD for Cr 6+ by IC is 0.2 ng/ml.B-2

Chromium Source Testing Results Project: Walkers Chrome
Date ml of sample Total Cr Total Cr Cr(VI) Cr(VI) Analyzed Sample ID collected ng/ml ng recovered ng/ml ng recovered 3/28/2006 W11-I1 104.6 5.7 600 5.3 550 3/28/2006 W11-I2 105.7 <1.0 <110 0.3 32 3/28/2006 W11-Probe 82.7 13 1100 8.2 680 3/28/2006 W12-I1 93.2 7.3 680 6.3 590 3/28/2006 W12-I2 103.8 1.1 110 0.4 42 3/28/2006 W12-Probe 78.6 54 4300 33 2600 3/28/2006 W12-Probe 78.6 54 4300 34 2600 3/28/2006 W13-I1 106.1 15 1600 15 1600 3/28/2006 W13-I2 105.2 1.7 180 1 110 3/28/2006 W13-Probe 103 28 2900 18 1900 3/28/2006 W14-I1 93.8 2.5 230 0.7 66 3/28/2006 W14-I2 101.3 1.4 140 0.5 51 3/28/2006 W14-Probe 73.8 8.7 640 2.7 200B-3



### Subject: Walker Chrome plating bath analysis by Anachem Date: Tue, 16 May 2006 08:25:37 -0700 From: Robert Barrera <rbarrera@arb.ca.gov> To: David Todd <dtodd@arb.ca.gov>, Carla Takemoto <ctakemot@arb.ca.gov> The analysis on the chromium plating bath sample from Walker's has been completed except for the Hull Cell test. The results are as follows: Date: May 11, 2006 Lab#: B16229 SA# 054005 Chromic Acid 34.8 oz/gal Sulfate 0.40 oz/gal Ratio 87/1 Trivalent Chromium0.5% Surface Tension 28.9 dynes/cm Baume 24.4 Chloride <25 mg/L Iron 0.91 g/L Copper 2.08 g/L Zinc 0.51 g/L
The Hull Cell result will be in this week. Robert Barrera <rbarrera@arb.ca.gov> Air Resources Engineer California Air Resources Board Stationary Source Division(This page is blank.)"'c,.,



### Appendix C

Field Data Sheets



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