M-101663-01_18361A_(1999)_Paseo_Real_WRF_(Santa_Fe,_NM).pdf

PLANT VISIT REPORT

PLANT NAME & ADDRESS:

Paseo Real WWTP 73 Paseo Real Santa Fe, NM 87507

WESTECH JOB NO: M-101663-01/18361A (1999)

AUTHOR OF REPORT: Jess Kelley WESTECH GROUP NUMBER: 31102

WESTECH PROJECT MANAGER: Lauren Szilagyi WESTECH GROUP NUMBER: 31101

WESTECH REPRESENTATIVE: Nicole Rusconi AGENCY: Goble Sampson Phoenix

EQUIPMENT: 94-foot COPC2 Primary Clarifier No. 2 (west) with 42-inch DV8050 grease-lubricated cage drive

REASON FOR VISIT: The purpose of my site visit was to inspect all components of the clarifier, assess their condition, and make recommendations as to what course of action should be taken to keep the clarifier running without interruption.

CONTACTS

LeRoy Alvarado Plant Superintendent

(505) 469-5358 lmalvarado@santafenm.gov

PLANT VISIT NOTES

WEDNESDAY, MAY 24, 2026

1. DRIVE

OBSERVATIONS

The drive housing, the reducer attachments, the cage ear attachments, and the torque box plate are in good condition and show little corrosion. The original paint is mostly undamaged and in good condition. The stainless steel torque box is in good condition and the torque control switches are closing at the design torque levels.

The reducer assembly is leaning very badly to the side. This indicates that the lower pinion bearing and perhaps the upper pinion bearing as well, have disintegrated.

There is a gap between the lower edge of the main gear teeth and the plate to which the main gear/bearing is bolted. When the drive is new, this gap is 1/4 inch. As the drive ages and the main bearing wears, this gap narrows, and thus provides a good indication of the condition of the main bearing. This gap is now approximately 3/32 inch, or slightly less that 1/8 inch. This indicates that the case hardened surface of the bearing balls and the induction hardened surface of the bearing races are worn through and that main bearing is worn out. This means that the bearing is riding on unhardened steel and that the main bearing could fail at any time and thus idle the drive and put the clarifier out of commission.

RECOMMENDATIONS

I recommend that the drive be replaced altogether. Replacing the drive would be less expensive than reconditioning the drive to get it back to new condition.

2. CENTER PLATFORM

OBSERVATIONS

The center platform is in good condition. There is little or no corrosion and the original paint is intact and in good condition.

RECOMMENDATIONS

I recommend that the center platform be left as it is.

3. BRIDGE

The bridge is in good condition. There is little or no corrosion and the original paint is intact and in good condition.

RECOMMENDATIONS

I recommend that the bridge be left as it is.

4. LAUNDER TROUGH

OBSERVATIONS

The concrete of the launder trough is in good condition. There is no cracking and spalling of the surface is not deep.

RECOMMENDATIONS

I recommend that the launder trough be left as it is.

5. V-NOTCH EFFLUENT WEIRS & BAFFLES

OBSERVATIONS

The v-notch effluent weirs and inner baffles are made of fiber reinforced plastic (FRP). The mounting brackets and fasteners are stainless steel. The weirs and baffles are clean, show no UV deterioration from the sun, and are in good condition. The stainless steel mounting brackets and fasteners are in good condition.

RECOMMENDATIONS

I recommend that the FRP v-notch effluent weirs and inner baffles and the stainless steel mounting brackets and fasteners be left as they are.

6. ANTI-DENSITY-CURRENT “STAMFORD” BAFFLES

OBSERVATIONS

The anti-density-current or “Stamford” baffles are made of fiber reinforced plastic (FRP). The mounting brackets and fasteners are stainless steel. The baffles are clean, show no UV deterioration from the sun, and are in good condition. The stainless steel mounting brackets and fasteners are likewise in good condition.

RECOMMENDATIONS

I recommend that the FRP anti-density-current or “Stamford” baffles and the stainless steel mounting brackets and fasteners be left as they are.

7. RAKE ARMS

The rake arms show a great deal of corrosion and the original paint is worn or missing in many places. The corrosion of the main rake arm members and diagonal braces is not through and is not deep enough to jeopardize the structural integrity of the arms. The corrosion of the vertical posts and members which support the spiral rake blades, however, is deep and through in many places.

I recommend that the rake arms either be replaced entirely, or else repaired, sandblasted and repainted.

8. SPIRAL RAKE BLADES AND STAINLESS STEEL SQUEEGEES

The spiral rake blades show extensive, deep and through corrosion and the original paint is almost all badly damaged and missing. The stainless steel squeegees are bent and detached from the rake blades in places.

RECOMMENDATIONS

I recommend that the spiral rake blades and the stainless steel squeegees be replaced entirely.

9. SCUM SKIMMER

The scum skimmer mechanism, the long radial skimmer arm, and the skimmer supports show extensive deep corrosion and the original paint is badly damaged or missing. Parts of the skimmer mechanism are bent and damaged.

RECOMMENDATIONS

I recommend that the scum skimmer mechanism, the long radial skimmer arm, and the skimmer supports be replaced entirely.

10. SCUM BOX

The scum box, its supports, and its attached piping are badly corroded and the original paint is almost entirely missing.

RECOMMENDATIONS

I recommend that the scum box, its supports, and its attached piping be replaced entirely.

11. CAGE

The cage is in good condition. It shows extensive corrosion and the original paint is damaged and missing in many places, but the corrosion is not deep or through and the cage members are not distorted or otherwise damaged.

RECOMMENDATIONS

I recommend that the cage either be replaced or else sandblasted and repainted.

12. CENTER COLUMN

The center column is in good condition. The upper part of the column shows extensive corrosion and the original pain is worn over the entire length of the column, but the corrosion is thin. The base of the column and the bolts that attach it to the clarifier floor are in good condition.

RECOMMENDATIONS

I recommend that the center column be sandblasted and repainted.

13. ENERGY DISSIPATING INLET “EDI”

The energy dissipating inlet or EDI is in good condition. It shows extensive corrosion and the original pain is worn and absent in many places, but the corrosion is thin.

RECOMMENDATIONS

I recommend that the energy dissipating inlet or EDI be sandblasted and repainted.

14. FEED WELL

The feed well is in good condition. It shows extensive corrosion and the original pain is worn and absent in many places, but the corrosion is thin.

RECOMMENDATIONS

I recommend that the feed well be sandblasted and repainted.

15. CLARIFIER BASIN

OBSERVATIONS

The concrete of the clarifier basin appears to be in good condition. The concrete shows only shallow spalling and very little cracking and no heaving. I sounded out the floor in numerous locations and was unable to detect any separation between the floor grout and the underlying concrete.

I recommend that the clarifier basin be left as it is.

SUMMARY OF RECOMMENDATIONS

1. I recommend that the drive be replaced altogether. Replacing the drive would be less expensive than reconditioning the drive to get it back to new condition.

2. I recommend that the center platform be left as it is.

3. I recommend that the bridge be left as it is.

4. I recommend that the launder trough be left as it is.

5. I recommend that the FRP v-notch effluent weirs and inner baffles and the stainless steel mounting brackets and fasteners be left as they are.

6. I recommend that the FRP anti-density-current or “Stamford” baffles and the stainless steel mounting brackets and fasteners be left as they are.

7. I recommend that the rake arms either be replaced entirely, or else repaired, sandblasted and repainted.

8. I recommend that the spiral rake blades and the stainless steel squeegees be replaced entirely.

9. I recommend that the scum skimmer mechanism, the long radial skimmer arm, and the skimmer supports be replaced entirely.

10. I recommend that the scum box, its supports, and its attached piping be replaced entirely.

11. I recommend that the cage either be replaced or else sandblasted and repainted.

12. I recommend that the center column be sandblasted and repainted.

13. I recommend that the energy dissipating inlet or EDI be sandblasted and repainted.

14. I recommend that the feed well be sandblasted and repainted.

15. I recommend that the clarifier basin be left as it is.