![](media/image1.png){width="1.957638888888889in" height="0.39375in"}

**MEMORANDUM**

**TO:** Najm Shamim **cc.** 11.0248.5000.001.03

Wanda Jacob

Cletis Mixon

Pat Wood

**FROM:** Jignasha Patel/Traci Brody/Ron Lee, Versar Inc.

**DATE:** January 23, 2006

**SUBJECT:** DDAC Dietary Risk Assessment

Attached below is the dietary risk assessment for DDAC.

Please note the following:

-   Product #10324-117 may be used in potato storage areas where the
    potatoes are used as food/feed. When treating potato storage areas,
    the label states that all potatoes should be removed from the
    premises before application, and returned following air-drying of
    treatment solution. Since the product is not to be used directly on
    potatoes, it was assumed that exposures associated with this use are
    smaller than the exposures associated with food that comes into
    contact with treated utensils or countertops.

-   According to the Chlorine Dioxide, Sodium Chlorite Memorandum
    (USEPA, 2005), a method for assessing treated mushroom facilities
    has already been designed by USEPA. Versar, Inc. did not have more
    information regarding this method; therefore the assessment of
    treated mushroom facilities has not been incorporated into our
    assessment. It was assumed that dietary exposures from general
    agricultural premise use, poultry hatcheries, mushroom houses and
    hydroponic uses are much lower than the dietary exposures resulting
    from surface disinfectant and sanitizing uses.

Please contact us if you have any questions.

DIDECYL DIMETHYL AMMONIUM CHLORIDE

DIETARY RISK ASSESSMENT

(OPPTS 248.5000)

Prepared for:

Office of Pesticide Programs

Antimicrobial Division

U.S. Environmental Protection Agency

1921 Jefferson Davis Highway

Arlington, VA 22202

Prepared by:

Versar, Inc.

6850 Versar Center

Springfield, VA 22151

EPA Contract Number: 68-W-01-036

Work Assignment No. 0248.5000.001.03

TAF: 1-3-13

Date: January 20, 2006

### Executive Summary

Didectyl dimethyl ammonium chloride (DDAC) can be used as a disinfectant
or sanitizer on counter tops, utensils, appliances, tables,
refrigerators, on animal premises and/or farms, and in mushroom
premises. The use of antimicrobial on food or feed contact surfaces,
agricultural commodities, in animal premises and poultry premises
including hatcheries and application to food-grade eggs may result in
pesticide residues in human food. Residues from treated surfaces, such
as utensils, countertops, equipment, and appliances can migrate to food
coming into contact with the treated and rinsed surfaces and can be
ingested by humans.

In the absence of data for residues of DDAC on treated food contact
surfaces, the Agency estimated residue levels that may occur in food
from the application rates on food contact surfaces. Dietary exposures
from general agricultural premise use, poultry hatcheries, mushroom
houses and hydroponic uses are expected to be much lower than the
dietary exposures resulting from the surface disinfectant and sanitizing
uses; therefore, these uses were not assessed.

To estimate the Estimated Daily Intake (EDI) to treated food contact
surfaces and food utensils, an FDA (FDA, 2003) model was used in lieu of
residue data. The maximum application rate for DDAC in food handling
establishments from the various labeled ready-to-use products is 0.0043
pounds per gallon of treatment solution. The EDI calculations presented
in this assessment assumes that food can contact 2,000 cm^2^ or 4,000
cm^2^ (50% and 100% of the FDA worst case scenario) of treated surfaces,
and that 10% of the pesticide migrate to food, based on the Agency
Residential SOPs. The use of the 10% transfer rate, instead of the use
of a 100% transfer rate that is used in the FDA Sanitizer Solution
Guidelines, requires the submission of confirmatory data to establish
the reliability of the use of the10% transfer rate. These daily
estimates were conservatively used to assess both acute and chronic
dietary risks. None of the calculated % aPad or % cPad values exceeded
100%.

The maximum application rate for DDAC for bottling/packing of food is
0.0020 lbs a.i per gallons of treatment solution. EDI values were
calculated using an approach similar to that used for treated
food-contact surfaces and food utensils. Exposure was assumed to occur
through the ingestion of three food products that might be packaged with
treated material: milk, egg products, and beverages (alcoholic and
non-alcoholic). None of the calculated % aPad or % cPad values exceeded
100%.

### Dietary Toxicity

The acute or chronic Population Adjusted Dose (aPAD or cPAD) is
presented in Table 1. The aPAD and cPAD were both 0.1 mg/kg/day (Versar,
2006).

## 

## Table 1: DDAC Dietary Toxicity

+---------------+-----------------+---------------+--------------------+
| Exposure      | Dose Used in    | Target        | Study and          |
|               | Risk Assessment | MOE/UF,       | Toxicological      |
| Scenario      |                 |               | Effects            |
|               | (mg/kg/day)     | Special FQPA  |                    |
|               |                 | SF            |                    |
|               |                 |               |                    |
|               |                 | for Risk      |                    |
|               |                 | Assessment    |                    |
+===============+=================+===============+====================+
| Acute Dietary | NOAEL           | FQPA SF = 1   | Prenatal           |
|               | (developmental) |               | Developmental      |
| (Females      | = 10 mg/kg/day  | UF = 100 (10x | Toxicity - Rat     |
| 13-50)        |                 | inter-species |                    |
|               |                 | e             | MRID 41886701      |
|               |                 | xtrapolation, |                    |
|               |                 | 10x           | LOAEL = 20         |
|               |                 | intra-species | mg/kg/day based on |
|               |                 | variation)    | increased          |
|               |                 |               | incidence of       |
|               |                 |               | skeletal           |
|               |                 |               | variations.        |
+---------------+-----------------+---------------+--------------------+
|               | aPAD = 0.1      |               |                    |
|               | mg/kg/day (for  |               |                    |
|               | Females age     |               |                    |
|               | 13-50)          |               |                    |
+---------------+-----------------+---------------+--------------------+
| Chronic       | NOAEL = 10      | FQPA SF = 1   | Chronic Toxicity   |
| Dietary       |                 |               | Study - Dog        |
|               | mg/kg/day       | UF = 100 (10x |                    |
| (general      |                 | inter-species | MRID 41970401      |
| population)   |                 | e             |                    |
|               |                 | xtrapolation, | LOAEL = 20         |
|               |                 | 10x           | mg/kg/day based on |
|               |                 | intra-species | decreased total    |
|               |                 | variation     | cholesterol levels |
|               |                 |               | in females.        |
+---------------+-----------------+---------------+--------------------+
|               | cPAD = 0.1      |               |                    |
|               | mg/kg/day       |               |                    |
+---------------+-----------------+---------------+--------------------+

a\. cPAD or aPAD= the RfD/FQPA SF (acute RFD and FQPA for aPAD and
chronic RFD and FQPA SF for the cPAD)

### Use Information

Seven DDAC products were identified that have uses that could lead to
incidental ingestion. These uses/products are presented in Table 2. The
labels with the maximum-listed application rate for each use are
presented in bold.

Table 2: Use Site Categories and Application Rates

+-----------------------+--------------+---------------+---------------+
| Use Site              | Product      | Method of     | Range of      |
|                       | Label        | Application   | Application   |
|                       | (            |               | Rates (lb     |
|                       | Registration |               | a.i./gal)     |
|                       | No.)         |               |               |
+=======================+==============+===============+===============+
| Egg handling          | 10324-80     | Fogger        | 0.0223-0.0563 |
| equipment: Incubator  |              |               |               |
| and hatchers          | 1839-173     |               |               |
|                       |              |               |               |
|                       | 10324-81     |               |               |
|                       |              |               |               |
|                       | 10324-108    |               |               |
|                       |              |               |               |
|                       | *            |               |               |
|                       | *10324-117** |               |               |
+-----------------------+--------------+---------------+---------------+
| Hatchery: hatchery,   | **10324-80** | Mop, cloth,   | 0.0014-0.0043 |
| settlers, trays,      |              | sponge, hand  |               |
| racks, carts, sexing  | 1839-173     | pump trigger  |               |
| tables, delivery      |              | sprayer, or   |               |
| trucks, and other     | 10324-81     | low pressure  |               |
| hard surfaces         |              | coarse        |               |
|                       | 10324-108    | sprayer       |               |
|                       |              |               |               |
|                       | 10324-117    |               |               |
+-----------------------+--------------+---------------+---------------+
| Egg handling rooms:   | 10324-80     | Fogger        | 0.0007-0.2193 |
| hatcheries            |              |               |               |
|                       | 1839-173     |               |               |
|                       |              |               |               |
|                       | **10324-81** |               |               |
|                       |              |               |               |
|                       | 10324-108    |               |               |
|                       |              |               |               |
|                       | 10324-117    |               |               |
|                       |              |               |               |
|                       | 10324-134    |               |               |
+-----------------------+--------------+---------------+---------------+
| Egg packing plants:   | 1839-173     | Immersion,    | 0.0007-0.0020 |
| food grade eggs       |              | low pressure  |               |
|                       | **10324-81** | coarse        |               |
|                       |              | sprayer, or   |               |
|                       | *            | swabs         |               |
|                       | *10324-117** |               |               |
+-----------------------+--------------+---------------+---------------+
| Food handling         | 1839-173     | Immersion,    | 0.0020        |
| establishments:       |              | low pressure  |               |
| utensils and          | 10324-81     | coarse        |               |
| equipment             |              | sprayer, or   |               |
|                       | 10324-117    | swabs         |               |
+-----------------------+--------------+---------------+---------------+
| Food handling         | 10324-81     | Mop, cloth,   | 0.0023-0.0043 |
| establishments:       |              | sponge, hand  |               |
| countertops,          | 10324-108    | pump trigger  |               |
| appliances, and       |              | sprayer, or   |               |
| tables                | 10324-117    | low pressure  |               |
|                       |              | coarse        |               |
|                       | 1839-173     | sprayer       |               |
|                       |              |               |               |
|                       | **10324-80** |               |               |
+-----------------------+--------------+---------------+---------------+
| Food processing       | 10324-81     | Mop, cloth,   | 0.0020-0.0043 |
| plants: (poultry,     |              | sponge, hand  |               |
| meat, fish, tobacco   | 10324-108    | pump trigger  |               |
| etc.): hard surfaces  |              | sprayer, or   |               |
| and                   | 10324-117    | low pressure  |               |
|                       |              | coarse        |               |
| equipment, including  | **10324-80** | sprayer,      |               |
| utensils, dishes,     |              | feeding       |               |
| silverware, glasses,  | 1839-173     | equipment     |               |
| sink tops,            |              |               |               |
| countertops,          | 10324-134    |               |               |
| refrigerated storage, |              |               |               |
| display equipment,    |              |               |               |
| storage shelves,      |              |               |               |
| appliances, conveyers |              |               |               |
| (fruits/vegetables or |              |               |               |
| meat/poultry) etc.    |              |               |               |
+-----------------------+--------------+---------------+---------------+
| Bottling/packaging    | 1839-173     | Towel,        | 0.0020        |
| sanitizer: food       |              | circulation,  |               |
| contact surface       | 10324-81     | liquid pour - |               |
| sanitizer (i.e.       |              | mechanical or |               |
| bottle sanitizing,    | 10324-117    | automated     |               |
| beer storage tanks,   |              | systems       |               |
| and beverage          |              |               |               |
| dispensing unit)      |              |               |               |
+-----------------------+--------------+---------------+---------------+
| Mushroom facilities   | **10324-80** | Mop, cloth,   | 0.0023-0.0086 |
|                       |              | sponge, hand  |               |
|                       | 10324-81     | trigger       |               |
|                       |              | sprayer, or   |               |
|                       | 10324-108    | coarse spray  |               |
|                       |              | device        |               |
|                       | 10324-117    |               |               |
+-----------------------+--------------+---------------+---------------+
| Farm (poultry, swine, | 1839-173     | Towel, mop,   | 0.0007-0.0043 |
| dairy) premises, feed |              | cloth,        |               |
| storage areas, and    | 10324-81     | sponge, hand  |               |
| cows (uters, flanks,  |              | trigger       |               |
| and teats)            | **10324-80** | sprayer, or   |               |
|                       |              | coarse spray  |               |
|                       | 1839-173     | device        |               |
|                       |              |               |               |
|                       | 10324-108    |               |               |
|                       |              |               |               |
|                       | 10324-117    |               |               |
+-----------------------+--------------+---------------+---------------+

**3. Quantitative Dietary assessment**

**3.1 Egg handling equipment, Agricultural Premise Use, and Poultry
Hatcheries**

DDAC products may be used on egg shells in both poultry hatcheries and
food grade-eggs. Although it is possible that some of
sanitizer/disinfectant chemicals may penetrate the egg shells, at this
time the Agency believes that the amount of the chemical transferred
into food is likely to be minimal. Dietary exposures from general
agricultural premise use, poultry hatcheries, mushroom houses and
hydroponic uses are expected to be much lower than the dietary exposures
resulting from the surface disinfectant and sanitizing uses; therefore,
these uses were not assessed.

**3.2 Food Handling Establishments and Food Processing Plants**

To calculate the EDI associated with use of a DDAC product as a food
utensil sanitizer in food handling establishments, a number of
assumptions have been made based on the FDA guidelines (FDA, 2003).

1.  When a surface is treated with a disinfectant, a quantity of the
    disinfectant remains on the surface (Residual Solution). The FDA
    recommended worst-case concentration for this quantity is 1 mg of
    solution per square centimeter of treated surface area. In the
    absence of any other data, this value has been used.

2.  The FDA suggests that, as a worst-case scenario, all food that an
    individual consumes will come into contact with 4,000 cm^2^ of
    sanitized non-porous food-contact surfaces. This contact area
    represents all the surface area from silverware, china, and glass
    used by a person who regularly eats three meals per day at an
    institutional or public facility.

3.  It is assumed that 10% of the active material present on food
    contact surfaces will migrate.

4.  The body weights used for this assessment are: adult man = 70 kg;
    adult woman = 60 kg, and 3-yr old toddler = 15 kg (USEPA, 1997).

For use of a DDAC product as a counter top disinfectant in food handling
establishments, the same assumptions as listed above were used, and one
additional assumption was added:

1.  The amount of counter top surface area that comes in contact with
    food should be much smaller than the amount of food utensil area
    that comes into contact with food. As a conservative estimate, it is
    assumed that 50% of the FDA value, or 2,000 cm^2^ of treated counter
    top surface area, comes into contact with an individual's food per
    day.

The above assumptions and the following equations were used to calculate
EDI and Dietary Daily Dose (DDD):

> EDI (mg/p/day) = AR x RS x SA x F x 10^-6^ (1)
>
> DDD (mg/kg/day) = AR x RS x SA x F x 10^-6^/BW (2)

Where:

AR = Application rate (ppm)

RS = Residual solution (mg/cm^2^)

> SA = Surface area of the treated surface which comes into contact with
> food (cm^2^)

F = Fraction of the pesticide transferred or migrated to food (unitless)

> BW = Body weight (kg)

The input parameters listed in Table 4 and equations 1 and 2 were used
to calculate the output parameters listed in Table 5.

Table 4: Input Parameters for Food Handling Establishments and Food
Processing Plants Hard Surface Sanitizer

+---------------+---------------+-------------+-----------------------+
| **Parameter** | **Value**     |             | **Rationale**         |
+---------------+---------------+-------------+-----------------------+
|               | **Food        | **C         |                       |
|               | Utensil**     | ountertop** |                       |
+---------------+---------------+-------------+-----------------------+
| Residual      | 1 mg/cm^2^    |             | FDA worst-case        |
| Solution on   |               |             | assumption            |
| Surface       |               |             |                       |
+---------------+---------------+-------------+-----------------------+
| Area of       | 4,000 cm^2^   | 2,000 cm^2^ | 100% and 50% of FDA   |
| Treated       |               |             | worst-case assumption |
| Surface       |               |             | for food utensils     |
+---------------+---------------+-------------+-----------------------+
| DDAC          | 0.0020 lb     | 0.0043 lb   | Diluted Solution      |
| concentration | a.i./gal or   | a.i./gal or | concentration, based  |
| in diluted    | 240 ppm       | 515 ppm     | on maximum            |
| Solution^a^   |               |             | concentration.        |
+---------------+---------------+-------------+-----------------------+
| Fraction      | 10%           |             | EPA Assumption        |
| Transferred   |               |             |                       |
+---------------+---------------+-------------+-----------------------+
| Body Weight   | > 70          |             | EPA, 1997             |
| (kg)          | >             |             |                       |
|               | > 60          |             |                       |
| Adult man =   |               |             |                       |
|               | 15            |             |                       |
| Adult woman = |               |             |                       |
|               |               |             |                       |
| Child =       |               |             |                       |
+---------------+---------------+-------------+-----------------------+

a\. Maximum application rates for food utensils were from product labels
1839-173, 10324-81, and 10324-117 for Utensils and product label
10324-80 for counter-tops.

Table 5: Calculated EDIs, aPAD, and cPAD for Utensils and Countertops

  ------------ -------------- ------------- ---------- ----------------- ------------- ---------- --------------- ------------- -------------
  **Exposure   **Utensils**                            **Countertops**                            **Aggregate**                 
  Group**                                                                                                                       

               **EDI          **DDD         **%        **EDI (mg/p/d)**  **DDD         **%        **EDI           **DDD         **% PAD^a^
               (mg/p/d)**     (mg/kg/d)**   PAD^a^**                     (mg/kg/d)**   PAD^a^**   (mg/p/d)**      (mg/kg/d)**   (mg/kg/d)**

  Adult males  0.0959         0.00137       1.37       0.103             0.00147       1.47       0.199           0.00284       2.84

  Adult        0.0959         0.00160       1.60       0.103             0.00172       1.72       0.199           0.00332       3.32
  females                                                                                                                       

  Children     0.0959         0.00639       6.39       0.103             0.00687       6.87       0.199           0.0133        13.3
  ------------ -------------- ------------- ---------- ----------------- ------------- ---------- --------------- ------------- -------------

a\. % PAD = exposure (DDD) /(aPAD or cPAD) x 100. The acute and chronic
population average dose is the same; therefore the % PADs are the same.

For DDAC treatments of food processing plants, the application rates are
similar to food handling establishments presented above, and hence the
exposure, EDIs, DDDs, and % aPAD and cPADs are also similar.

4.  **Food Bottling/Packaging**

DDAC may also be used as a sanitizer or disinfectant in processing
equipments, utensils in dairies, breweries, canning operations, meat and
vegetable processing plants. In assessing this use, the following
assumptions were made, based on USEPA (2005):

1.  The DDAC concentration in the treatment solution is 0.0020 lb
    a.i./gal, or 240 ppm (0.00024 wt/wt)

2.  When a surface is treated with a disinfectant, a quantity of the
    disinfectant remains on the surface (Residual Solution). The FDA
    recommended worst-case concentration for this quantity is 1 mg of
    solution per square centimeter of treated surface area. In the
    absence of any other data, this value has been used.

3.  For the fraction of pesticide that migrates from the residue to the
    food (*F* in equations 3 and 4), a transfer rate of 100% was used
    instead of 10% because the food is in contact with the treated
    surfaces for potentially very long periods of time.

4.  For a given person, the grams of food per surface area of container
    were as follows (g/cm^2^):

    a.  Milk (dairy): 6.6

    b.  Egg/mayonnaise: 64.0

    c.  Beer, beverages: 150

5.  The daily intake rates for an adult (g/person/day) were as follows:

    a.  Beverages, alcoholic/beer: 182

    b.  Beverages, non-alcoholic: 240

    c.  Egg products: 9.0

    d.  Milk: 124

6.  A child will consume a smaller quantity of calories in a given day.
    To account for differences between intake values among children and
    adults a calorie intake modification factor of 0.64 was applied to
    the EDI for a child. Recommended energy allowances measured in
    kilocalories per body weight for different age groups and genders
    were taken from the National Research Counsil's Recommended Energy
    Allowances. The values are based on the resting energy expenditure
    and the energy required for light to moderate levels of activity, as
    determined by the World Health Organization (USAID, 2005). The
    calculation of the factor is presented in Table 6 below.

> The above assumptions and the following equations were used to
> calculate EDI and Dietary Daily Dose (DDD):
>
> EDI (mg/p/day) = AR x RS x DIR x MSA^-1^ x F x 10^-6^ x CMF (3)
>
> DDD (mg/kg/day) = AR x RS x DIR x MSA^-1^ x F x 10^-6^ x CMF/BW (4)

Where:

AR = Application rate (ppm)

RS = Residual solution (mg/cm^2^)

> MSA = Mass-surface area ratio (the treated surface that comes into
> contact with food) (g/cm^2^)
>
> DIR = Daily intake rate of food in a given day (g/p/day)

F = Fraction of the pesticide transferred or migrated to food (unitless)

> BW = Body weight (kg)
>
> CMF = Calorie intake modification factor (100% adults; 64.4% Children)

Assumptions 1-4, inputs from Table 6 and 7, and equations 3 and 4 were
used to calculate the dietary rates and doses presented in Table 8.

Table 6: Toddler (3-yr old) and Adult Calorie Intake Comparison

+-----------------------+-------------+-------------+---+----------------+
| **Group (Age)**       | **Body      | **K         | * |                |
|                       | Weight      | ilocalories | * |                |
|                       | (kg)**      | per kg^a^** | K |                |
|                       |             |             | i |                |
|                       |             |             | l |                |
|                       |             |             | o |                |
|                       |             |             | c |                |
|                       |             |             | a |                |
|                       |             |             | l |                |
|                       |             |             | o |                |
|                       |             |             | r |                |
|                       |             |             | i |                |
|                       |             |             | e |                |
|                       |             |             | s |                |
|                       |             |             | ^ |                |
|                       |             |             | b |                |
|                       |             |             | ^ |                |
|                       |             |             | * |                |
|                       |             |             | * |                |
+-----------------------+-------------+-------------+---+----------------+
| Child (1-3)           | 15.0        | 102         | 1 |                |
|                       |             |             | , |                |
|                       |             |             | 5 |                |
|                       |             |             | 3 |                |
|                       |             |             | 0 |                |
+-----------------------+-------------+-------------+---+----------------+
| Female (25-50)        | 60.0        | 36.0        | 2 |                |
|                       |             |             | , |                |
|                       |             |             | 1 |                |
|                       |             |             | 6 |                |
|                       |             |             | 0 |                |
+-----------------------+-------------+-------------+---+----------------+
| Male (25-50)          | 70.0        | 37.0        | 2 |                |
|                       |             |             | , |                |
|                       |             |             | 5 |                |
|                       |             |             | 9 |                |
|                       |             |             | 0 |                |
+-----------------------+-------------+-------------+---+----------------+
| **Output**            |             |             |   |                |
+-----------------------+-------------+-------------+---+----------------+
| ##### Child Modifica  |             |             |   | 0.644          |
| tion Factor (CMF)^c^  |             |             |   |                |
+-----------------------+-------------+-------------+---+----------------+

a.  USAID, 2005

b.  Kilocalories = Kcal/Kg x BW

c.  CMF = Kcal-child ÷ \[(Kcal-female + Kcal-male)/2\]

Table 7: Input Parameters for Food Bottling/Packaging Hard Surface
Sanitizer

+-------------------+---------------+-------+-------------------------+
| **Parameter**     | ##### Input   |       | **Rational**            |
+-------------------+---------------+-------+-------------------------+
| Food mass/surface | Milk          | 6.6   | USEPA, 2005             |
| (g/cm^2^)         |               |       |                         |
|                   |               |       |                         |
+-------------------+---------------+-------+-------------------------+
|                   | E             | 64    |                         |
|                   | gg/Mayonnaise |       |                         |
+-------------------+---------------+-------+-------------------------+
|                   | Beer,         | 150   |                         |
|                   | beverages     |       |                         |
+-------------------+---------------+-------+-------------------------+
| Intake rates      | Milk          | 124   | USEPA, 2005             |
| (g/p/d)           |               |       |                         |
|                   |               |       |                         |
|                   |               |       |                         |
|                   |               |       |                         |
|                   |               |       |                         |
|                   |               |       |                         |
+-------------------+---------------+-------+-------------------------+
|                   | Egg products  | 9     |                         |
+-------------------+---------------+-------+-------------------------+
|                   | Beer,         | 182   |                         |
|                   | beverages     |       |                         |
+-------------------+---------------+-------+-------------------------+
|                   | Beverages/    | 240   |                         |
|                   | nonalcoholic  |       |                         |
+-------------------+---------------+-------+-------------------------+
| Fraction          | 100%          |       | FDA worst case          |
| Transferred       |               |       | assumption              |
+-------------------+---------------+-------+-------------------------+
| Residual Solution | 1 mg/cm^2^    |       | FDA worst case          |
| on Surface        |               |       | Assumption              |
+-------------------+---------------+-------+-------------------------+
| Quantity DDAC     | 0.0020 lb ai  |       | Diluted solution        |
|                   | or 240 ppm    |       | concentration, based on |
|                   |               |       | maximum concentration.  |
+-------------------+---------------+-------+-------------------------+
| Body Weight (kg)  |               |       |                         |
|                   |               |       |                         |
| Adult man =       | 70            |       | USEPA, 1997             |
|                   |               |       |                         |
| Adult woman =     | 60            |       |                         |
|                   |               |       |                         |
| Child =           | 15            |       |                         |
+-------------------+---------------+-------+-------------------------+

a\. Maximum application rates for food utensils were from product labels
1839-173, 10324-81, and 10324-117.

Table 8: Calculated EDIs, aPAD, and cPAD for Representative Dairy and
Beverage Consumption

  --------------------- ---------------- ------------- -------------- -------------
  **Food Type**         **Exposure       **EDI         **DDD          **% PAD**
                        Group**          (mg/p/d)**    (mg/kg/d)**    

  Milk                  Adult Male       0.00451       6.44x10^-5^    0.0644

                        Adult Female                   7.52x10^-5^    0.0752

                        Child^a^         0.00290       1.94x10^-4^    0.194

  Egg product           Adult Male       8.10x10^-9^   1.16x10^-10^   1.16x10^-7^

                        Adult Female                   1.35x10^-10^   1.35x10^-7^

                        Child ^a^        5.22x10^-9^   3.48x10^-10^   3.48x10^-7^

  Beverages,            Adult Male       0.0230        3.29x10^-4^    0.329
  non-alcoholic                                                       

                        Adult Female                   3.84x10^-4^    0.384

                        Child^a^         0.0148        9.90x10^-4^    0.990

  Beverages, alcoholic, Adult Male       2.91x10^-4^   4.16x10^-6^    0.00416
  beer                                                                

                        Adult Female                   4.85x10^-6^    0.00485
  --------------------- ---------------- ------------- -------------- -------------

a\. Child EDI values are multiplied by a modification factor of 0.644

**4.0 References**

FDA. 2003. "Sanitizing Solutions: Chemistry Guidelines for Food Additive
Petitions."

Last accessed June 9, 2003.

USAID. 2005. "ANNEX III: Recommended Energy Allowance Tables." November
2005.
<http://www.usaid.gov/our_work/humanitarian_assistance/ffp/crg/annex-3.htm>.
Last viewed January 23, 2006.

USEPA. 1997. Exposure Factors Handbook. Volume I-II. Office of Research
and Development. Washington, D.C. EPA/600/P-95/002Fa. August 1997.

USEPA. 2005. Dietary Assessment of Chlorine Dioxide, Sodium Chlorite
From Their Use As Indirect Food Contact Sanitizers/Disinfectants (Hard
Surface Sanitizers). Memorandum from Najm Shamim, USEPA to Melba Morrow
and Jennifer Slotnick, USEPA. Dates August 15, 2005.

Versar. 2006. DDAC Occupational and Residential Exposure Assessment.
Memorandum from Adria Diaz/Karie Riley/Kelly McAloon, Versar, Inc., to
Laura Bailey, USEPA dated January 20, 2006.