J2 - APPENDIX CLARIFICATIONS 1 SYSTEM AND CONTROL EQUIPMENT DESIGN INCINER8 LATAM.pdf

SPIN WASHING MACHINE JUNE 2026

APPENDIX – CLARIFICATIONS

FINAL DESIGN|INCINERATOR COMBUSTION

GAS CONDITIONING AND CONTROL SYSTEM

– EMBASSY OF THE UNITED STATES OF

AMERICA – COSTA RICA

Drug Incinerator Operations Advisor

Contractor - ATSG Corporation

ATSG CARSI

Costa Rica – Central America

Guatemala, June 2026

Prepared by

SENSITIVE BUT UNCLASSIFIED

APPENDIX CLARIFICATIONS 1 -SYSTEM AND CONTROL EQUIPMENT DESIGN – INCINER8 LATAM

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CONTENT

CONTENTS

MAIN CLARIFICATIONS AND ANSWERS TO INL - OIJ QUESTIONS

ADDITIONAL QUERIES ON PLANS – INL

ADDITIONAL INQUIRIES CONSULTING ENGINEER – INL GUATEMALA

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MAIN CLARIFICATIONS AND ANSWERS TO INQUIRIES INL - OIJ

1. On page 8 of the document, it states that the central spray pipe is 7.11 meters long. However, the design data on the following page indicates that the central pipe is 4.271 meters long. Please correct this information in the document.

Clarification: The correct dimension is the one shown in the plans, 4,271mm; the table is attached again for reference.

2. It is stated that 8% sodium hydroxide and agitators can be used to prevent limescale buildup. I am concerned that hydroxide particles may be present in the water and could eventually clog the nozzles. Is this factored into the nozzle diameter?

Answer: The nozzles can eventually become clogged, and although they have a relatively large diameter according to the design, maintenance should be performed, if considered and detailed more precisely in the operation and maintenance manual.

3. It is also noted that the lower the alkaline concentration of the solution, the lower the neutralization efficiency will be. This could eventually prevent the acid gases from reaching the expected level. How certain are we that 8% sodium hydroxide will provide adequate neutralization?

Answer: With an 8% sodium hydroxide concentration, the pH would be between 13.8 and 14. With a 1% sodium hydroxide concentration, the pH would be close to 13. The same happens with calcium hydroxide. Conclusion: The acidic gases will be neutralized, or rather, removed.

4. The use of calcium hydroxide will generate solid sludge; how often will the sedimentation tank need to be cleaned?

Answer: Calcium hydroxide generates very little calcium carbonate and solid sludge; these are largely the particles that will be removed.

5. According to the design, will there now be two types of waste to treat: solid sludge and wastewater? If so, this could have a significant cost impact on the process.

Answer: The water in the tank is recycled; it doesn't need to be discarded. What needs to be managed is the sludge. Now, if you want to discharge the water into the sewer system, you should do so when the pH of the solution is around 6 to 8, which would be a very advanced stage of water reuse.

6. The design indicates 12 nozzles, but the notes state that the exact quantity should be checked with the distributor.

Does this mean the designer is unclear about the number of nozzles?

Clarification: The design, with the selected nozzles, includes 12 nozzles as long as they are purchased from the indicated company, but they can be purchased from other companies, and these must be adjusted to the required water flow, injection pressure, and nozzle size

7. If sodium hydroxide were used for neutralization, what concentration should be used?

Answer: According to preliminary calculations, the concentration of sodium hydroxide, or better yet calcium hydroxide, can be 1%.

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8. For maintenance purposes, are floor drains required when we need to clean both the washer and the reservoir tank?

Answer: The sedimentation tank must be cleaned depending on the number of incinerations. The higher the number, the more frequent the cleaning. This is determined on-site once the system has been installed. It requires floor drains, which are included in the design and are used to channel the wastewater to storage. Alternatively, sludge and neutralized water are removed during the process, depending on the selected option.

9. Additionally, the water that is taken from the reservoir tank to where it would be deposited, since it comes with elevated levels of substance that we add to neutralize it (Lime, Sodium, etc.).

Answer: Wastewater is what generates the solids. The solids must be removed from the water to prevent them from clogging the nozzles and to adjust the pH. The final water must be discarded once it has been neutralized according to the analyses performed and local regulations.

10. Will the Venturi (directional flow) be maintained?

Clarification: The current system is maintained, but it must be improved and perfected, as well as establishing preventive and corrective maintenance routines. The intervention would come after the auxiliary chimney, but some repairs to the horizontal section behind the post-combustion chamber, where the current sprinklers 1 and 2 are located, should be considered.

11. The mist eliminator: What is its lifespan?

Answer: The service life of a demister in a flue gas scrubber mainly depends on:

gas composition, temperature, particle load, presence of acids, gas speed, demister's material, washing frequency and maintenance.

That’s why there isn't a single exact lifespan, but there are typical ranges; it can be between 5 and 15 years.

12. Would the washer have an internal ladder to reach the highest nozzle?

Answer: It is not considered; the design plan is to make the tube in sections so that it can be easily assembled and disassembled for internal maintenance.

13. Could we consider changing the direction of the sprinkler at the outlet of the secondary chamber? This would prevent damage to the refractory lining of that duct.

Answer: Currently, this system is performing the function of lowering the temperature correctly, and the proposed system – Centrifugal Washer – will perform a complementary task. By changing the direction of the spray, we would also be changing this operating condition; however, this is something that can and should be evaluated in the construction phase.

ADDITIONAL INQUIRIES ABOUT PLANS – INL

1. In Figure 2, attached, a legend is repeated regarding the stainless-steel supply pipe. We believe this legend does not correspond to what is indicated, since it is the duct through which the incineration gases travel. Please confirm.

Answer: That’s correct, the legend is repeated, it refers to the supply pipe, in any case, what it’s pointing to is the pipe for the gases that go to the washer.

2. Figure 4, Sheet 4, shows the recirculation tank with a PVC discharge pipe. We would like to confirm the use of stainless steel as the best option due to the nature of the fluid. We also need clarification on the exact location of the pumps, as Figure 6 shows them inside the tank, while other drawings depict a pump room.

Finally, please indicate whether a wedge is required for cleaning the sludge inside the tank in the second section.

Answer: That’s correct. The entire pipe is considered to be stainless steel. Initially, PVC was considered and was used in the drawing, but ultimately, due to all the characteristics mentioned, the best option and the one selected is stainless steel.

APPENDIX CLARIFICATIONS -SYSTEM AND CONTROL EQUIPMENT DESIGN – INCINER8 LATAM

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When drawing the tank, the pumps were initially considered as shown. However, in the latest plan update, the option of installing them in a pump house was proposed. This house could have a cast-in-place support slab, and the pumps could be positioned parallel to each other to improve monitoring, maintenance, and operation.

Therefore, the correct location is in the pump house. Regarding the wedge, yes, additional structures can be added or fabricated to facilitate better maintenance. These changes would not affect the system and its proper operation, but they should also be evaluated by the construction team and defined in the system's operation and maintenance manual.

3. Regarding the tank outlets and feed inlets, we require the heights of the pipes and fittings needed in the lines. We also require the suction head.

Answer: The pipes are installed from floor level 0 up to a range of 30cm. This level of detail can be considered by the builder as it does not alter the operation of the system. It will also depend a lot on the type of support to be installed for the pipe and the level of demand on the system, also considering how it will be integrated with the existing air, water, etc. pipes. Therefore, the possibility is left open and will be defined at the time of construction.

4. Use of water recirculation pumps. Please specify the pump required for handling the flow with suspended solids and the filters required upstream of the pumps. Consider using "trash” or

"grinder” type pumps.

Answer: These types of specifications can be provided by the pump distributor. The requirements and specifications are shared with them so that they can provide commercial advice on the ideal type of pump. What we must guarantee for proper operation is the pressure and resistance it must overcome, the filters that can be installed, and the type of pump to move water with suspended solids.

5. We require the working pressure of the pumps (10 psi) and if they will be working within any area.

Answer: This system must be capable of handling 18.4 gal/min and overcome the losses in the water and treatment system. The working pressure must be a minimum of 10 psi; therefore, the operating range must be 100%, meaning it must reach twice the flow rate or equal to the pressure. All of this is regulated prior to operation by installing control pressure gauges and various pressure regulating valves.

6. Regarding the tank's waterproofing, given the nature of the water, could an epoxy-type coating be considered? Which one would you recommend?

Answer: Yes, that's correct. The most recommended option is to have an epoxy coating that guarantees waterproofing and extends the lifespan of the recirculation system (tank). The coating was proposed using SIKA monotop 101, but

You can consider another more robust, locally available coating, or one recommended by the supplier according to the type of water to be treated.

7. We understand that the formulation of the neutralizing solution, as currently planned in the project, will take place in the tank. Is this correct? What is the agitation system referred to in the "Additional Details"?

Is it manual or mechanical? We require clarification on how the neutralizing mixture will be formulated and where (liquid or solid, in an external tank, etc.). How will the equipment be fed?

Answer: This can be done in the tank, or it can also be in a barrel, drum (cubic tank) or external container and will depend on whether it is with a solid or liquid solution. A peristaltic dosing pump can also be considered to inject the required solution at the necessary dosing rate. If it is to be done outside or inside the tank, it can be done manually or mechanically, using a fixed or mobile agitator. These are details that can be considered for greater ease of operation.

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The water supply to the equipment is provided by the supply pump, which introduces water through the tube to the nozzles.

8. For parameter control, where would the sampling ports be located?

Answer: For water treatment parameter control, sampling ports are considered to be the access covers for each tank section, which allow water samples collected. A T-type drain valve may also be installed to collect samples for analysis by an external laboratory.

9. Regarding the impact zone, in the description of the materials, what does it correspond to?

Answer: If you are referring to the core breaker disc, it is the one located at the end of the spray tube with the nozzles that allows for greater and better interaction between the gas flow and the water droplets. If you are referring to the mist eliminator, it is the point of contact between the humid gas and the deflector vanes of this eliminator, which allows for a vapor shock and condensation of water droplets downwards in the scrubber. Finally, if you are referring to the impact zone in the equipment, it is the internal walls of the scrubber where the water pressure from the nozzles is received, and the gas scrubbing occurs.

Nickel-chromium alloys (Inconel 625 or Hastelloy C-276): If metal is required in the impact zone, these alloys offer excellent resistance to heat oxidation and acid corrosion. However, even these require quenching (water jackets) if exposed directly and for a prolonged period to 1000

°C.

ADDITIONAL INQUIRIES CONSULTING ENGINEER – INL GUATEMALA

"Keep the sprinkler at the outlet of the secondary chamber.

That's correct, this has been considered and that's why the final design was considered in this way to achieve an efficient team, smaller in size and operating inputs.

1.Ensure that the materials used in the washer and ducts are made of stainless steel with the coating specified in the proposal for a long lifespan (strictly monitor this issue).

It is considered for the system especially where there is greater contact with water, specifically in the body of the washer.

2.The water must be treated so that the gas scrubber nozzles have the least amount of scale build up (remember that water at elevated temperatures reacts and can, even if it is not hard water, create scale in the nozzles).

The reason why nozzles are ordered with a larger diameter is this: they will eventually become clogged, but this can be avoided with regular and necessary system maintenance, which the manufacturer should explain in the operation and maintenance manual.

3.Consider where the component will be manufactured; if everything is made of stainless steel, the

TIG (Tungsten Inert Gas) welding process must be used, and the workshop must have welders specialized for that process.

That's correct, the manufacturer should consider the best welding and waterproofing to prevent leaks at joints and relevant places of contact with the liquid.

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4.What is presented is in plans, but in reality, it must be considered that the spaces where

The water pipes and ducts will pass may have to be moved or adapted.

That's correct, we've even reached a level of detail much more specific than what’s required before manufacturing. Many doubts have been resolved, and there are few outstanding issues or pending matters left, thanks to the multidisciplinary group that has contributed, resolved concerns, and provided a wealth of documentation that will be well used by the manufacturer.

5.It is important to review with the architects the manhole space in the gas scrubber, since periodically

(every 15 days or as experience dictates) they will have to enter to check the nozzles and their condition, as this is crucial for maintaining low temperatures. If a couple of nozzles are obstructed or not providing the flow rate for which they were designed, the temperature difference will vary, and consequently the water inside will.

undergo chemical changes, creating a chain reaction. During operation, these nozzles cannot be checked; they can only be inspected at the end of the day.

This is the main reason why 3 manholes have been left that will allow access to the parts of the equipment in order to check the condition of the nozzles and internally the condition of the main equipment.

Sebastian Lopez Montoya| MBA ENVIRONMENTAL ENGINEER

Professional Registration No. 05238175412ANT

Commercial Director|INCINER8 LatAm

Email:slopez@inciner8latam.com

Website:www.inciner8latam.com

Carlos Alberto Echeverri Londoño| PhD in Environmental Engineering

Professional card No. 3546

Technical advisor|INCINER8 LatAm

Website:www.inciner8latam.com mailto:slopez@inciner8latam.com mailto:slopez@inciner8latam.com http://www.inciner8latam.com/ http://www.inciner8latam.com/