+--------------+---------------+---------------------------------------+
| **Appendix   |               |                                       |
| 4.           |               |                                       |
| P            |               |                                       |
| articipating |               |                                       |
| Vendors**    |               |                                       |
|              |               |                                       |
| **2005       |               |                                       |
| Arsenic      |               |                                       |
| Treatment    |               |                                       |
| Technology   |               |                                       |
| Vendors      |               |                                       |
| Forum**      |               |                                       |
|              |               |                                       |
| **November   |               |                                       |
| 2-3, 2005**  |               |                                       |
|              |               |                                       |
| **           |               |                                       |
| Albuquerque, |               |                                       |
| New Mexico** |               |                                       |
+==============+===============+=======================================+
| **Vendor**   | **Type of     | **Description of Technology by        |
|              | Technology**  | Vendor**                              |
+--------------+---------------+---------------------------------------+
| **ADA        | adsorbent     | Amended Silicate™ sorbents are based  |
| Tec          | (Amended      | on a process wherein active           |
| hnologies.** | Silicates)    | adsorption sites are distributed onto |
|              |               | an inert, inexpensive silicate        |
|              |               | substrate. This amendment process can |
|              |               | be tailored for the contaminant(s) of |
|              |               | interest. The arsenic variant         |
|              |               | utilizes a ferric hydroxide amendment |
|              |               | and has properties similar to other   |
|              |               | iron-based materials. However, the    |
|              |               | use of the inexpensive silicate       |
|              |               | substrate allows for efficient        |
|              |               | distribution of the iron at a low     |
|              |               | cost.                                 |
+--------------+---------------+---------------------------------------+
| **Argonide   | Nano iron /   | Alfox is a granular material          |
| C            | alumina       | consisting of a proprietary nano      |
| orporation** | (Alfox GR-3)  | alumina/nano iron hydroxide mixture.  |
|              |               | Laboratory testing shows it has about |
|              |               | 2 to 2.5 times the EBV v. Bayoxide    |
|              |               | E-33. It is a higher bulk density and |
|              |               | improved attrition resistance v.      |
|              |               | E-33.                                 |
+--------------+---------------+---------------------------------------+
| **Brimac     | Adsorption    | Brimac's adsorption media is a        |
| Carbon       | media (Brimac | granular bone char adsorbent with     |
| Service      | 216)          | duel components: carbon and           |
| Products**   |               | hydroxyapatite                        |
|              |               | \[Ca~10~(PO~4~)~6~(OH)~2~\]. The      |
|              |               | carbon surface adsorbs hydrophobic,   |
|              |               | lipophilic and weakly anionic         |
|              |               | molecules while the hydroxyapatite    |
|              |               | adsorbs strongly charged molecules    |
|              |               | together with many inorganic ions     |
|              |               | (metals).                             |
+--------------+---------------+---------------------------------------+
| **Graver     | Titanium      | HydroGlobe MetSorb G is a             |
| Technologies | oxide         | nonregenerable titanium based media,  |
| HydroGlobe   | (MetSorb)     | available in a range of mesh sizes    |
| Division**   |               | from powder to 16/60 mesh. Compared   |
|              |               | to competitive media, MetSorb G is    |
|              |               | less sensitive to common              |
|              |               | interferences such as silicates,      |
|              |               | phosphates, pH, and sulfates. It      |
|              |               | exhibits rapid kinetics, and hence    |
|              |               | low operating cost per thousand       |
|              |               | gallons of water treated. Disposal of |
|              |               | the material is simple as a           |
|              |               | nonhazardous waste by TCLP and        |
|              |               | California WET tests.                 |
+--------------+---------------+---------------------------------------+
| *            | Adsorbent     | The NXT-2 and NXT-CF are lanthanum    |
| *EaglePicher | media (NXT-2) | hydroxide based medias for adsorption |
| Filtration** | and           | and coagulation/filtration arsenic    |
|              | Coagulati     | removal, respectively. The lanthanum  |
|              | on/filtration | hydroxide provides pH stability up to |
|              | (NXT-CF)      | pH10 and removes both As(III) and     |
|              |               | As(V) without the need for chemical   |
|              |               | pretreatment. Both medias also remove |
|              |               | other contaminants such as phosphate, |
|              |               | flouride, selenium and others.        |
+--------------+---------------+---------------------------------------+
| **Inotec**   | Chemic        | The AsTECH process uses immobilized   |
|              | al/biological | functional groups and microorganisms  |
|              | (AsTECH)      | to bind and remove arsenic from       |
|              |               | concentrated and dilute solutions to  |
|              |               | levels at or below detection. Arsenic |
|              |               | is removed by chemical binding and    |
|              |               | biological transformation.            |
|              |               | Pilot-scale tests in mining waters    |
|              |               | have demonstrated arsenic removal to  |
|              |               | below detection. Additionally, the    |
|              |               | AsTECH process can be configured to   |
|              |               | simultaneously remove other metals    |
|              |               | and inorganics such as nitrates, Se,  |
|              |               | Zn, Mg, Cr, and others - also to near |
|              |               | or below detection. Scalable to treat |
|              |               | large flow, low capital and           |
|              |               | operational costs - operational costs |
|              |               | are expected to be in the \$0.10 to   |
|              |               | \$0.35/1000-gallon range.             |
+--------------+---------------+---------------------------------------+
| **Orca Water |               | Orca Water Technologies presents the  |
| Te           |               | Kemloop 1000. The system will remove  |
| chnologies** |               | arsenic and multi-contaminants using  |
|              |               | a partially recirculating coagulation |
|              |               | conduit combined with direct          |
|              |               | filtration.                           |
+--------------+---------------+---------------------------------------+
| **Purolite** | Ion exchange  | Purolite: Purolite\'s                 |
|              | and           | iron-impregnated anion resin,         |
| **SolmeteX,  | adsorptive    | ArsenX^np^, will remove arsenic and   |
| Inc**        | medias        | uranium. Modifications incorporating  |
|              | (ArsenX^np^;  | A-530E, our perchlorate selective     |
| **McPhee     | A-530E;       | resin, and/or our C-100E cation resin |
| E            | A-520E;       | will selectively remove perchlorate   |
| nvironmental | A-300E;       | and radium as well. Brine regenerable |
| Supply,      | C100E)        | SBA resins (A-520E and A-300E) will   |
| LLC**        |               | remove arsenic, nitrate, and uranium  |
|              |               | simultaneously.                       |
|              |               |                                       |
|              |               | SolmeteX: ArsenX^np^ is a hybrid      |
|              |               | polymeric media impregnated with iron |
|              |               | nanoparticles. Media has excellent    |
|              |               | capacity, flow dynamics, and is       |
|              |               | regenerable.                          |
|              |               |                                       |
|              |               | McPhee Environmental Supply offers    |
|              |               | arsenic removal systems featuring     |
|              |               | AsX^np^/ ArsenX^np^. Benefits of this |
|              |               | technology are smaller footprint,     |
|              |               | regenerable media, high pressure      |
|              |               | capacity, no backwashing, no pH       |
|              |               | adjustment, no waste, and virtually   |
|              |               | no O&M. Systems available for POU as  |
|              |               | well as small and large municipal     |
|              |               | applications.                         |
+--------------+---------------+---------------------------------------+
| **ResinTech, | Hybrid        | Iron-based adsorbent monatomically    |
| Inc.**       | re            | dispersed in the gel phase of a       |
|              | sin/adsorbent | strong base anion resin. Arsenic      |
|              | (ASM-10-HP)   | removal first occurs by ion exchange, |
|              |               | and then arsenic is adsorbed into the |
|              |               | iron. The hybrid resin has very rapid |
|              |               | kinetics and is significantly more    |
|              |               | robust than competitive granular      |
|              |               | medias.                               |
+--------------+---------------+---------------------------------------+
| **Virotec    | Adsorption    | Aresenic Removal                      |
| I            | (Bauxsol,     | Description:=Bauxsol™ has a high acid |
| nternational | Arsenic       | neutralizing capacity and an          |
| Limited**    | ProActiv)     | excellent ability to trap trace       |
|              |               | metals and metalloids. Trapped ions   |
|              |               | are tightly bound by mechanisms that  |
|              |               | include: precipitation of low         |
|              |               | solubility minerals, isomorphous      |
|              |               | substitution, solid-state diffusion,  |
|              |               | and adsorption. Bauxsol™ has an       |
|              |               | excellent ability to remove As(V)     |
|              |               | from water and field trials show the  |
|              |               | addition of Bauxsol™ to sulfidic rock |
|              |               | reduced the As concentration in       |
|              |               | leachate from 35 to less than 0.005   |
|              |               | mg/L.  Arsenic concentrations have    |
|              |               | remained below 0.005 mg/L for five    |
|              |               | years since the treatment and         |
|              |               | concentrations of trace metals have   |
|              |               | remained well below regulatory        |
|              |               | limits.                               |
+--------------+---------------+---------------------------------------+