| Chemical Product | Volume Applied | Dilution / Notes |
|---|---|---|
|
Sodium Hypochlorite (SH) 12.5%
⚠️ See SDS below · OSHA HazCom 2012 · GHS05
|
4.2 gal | Diluted to 0.75% application strength · 47 gal total water |
|
Apple Wash Non-ionic Surfactant
⚠️ See SDS below · OSHA HazCom 2012 · GHS07
|
0.6 oz | 0.15% concentration · reduces surface tension on limestone |
Crew arrived at Magnolia Ridge HOA Building 4
SH 0.75% dilution confirmed · Apple Wash added · solution loaded
Soft wash initiated on limestone facade · dwell timer started
4 min 30 sec dwell elapsed · rinse initiated at low pressure (800 psi)
Job complete · site cleared · BMP equipment packed
Wastewater recovery vacuum deployed prior to application start. Approximately 31.4 gallons of process wastewater captured from low-gradient concrete apron at building base. Wastewater hauled offsite in 50-gallon containment tank for authorized disposal per AZPDES permit conditions.
Two storm drain inlets identified within 50-foot work zone. Drain pillows placed prior to any water application (see Before photos 1–2). Both drains remained protected throughout job duration. Drain pillows removed and inspected post-job after confirming all runoff contained.
Exit pH reading taken at storm drain closest to work zone using calibrated Oakton PCSTestr 35 meter. Reading: 7.2. Discharge cleared per Arizona ADEQ AZPDES permit threshold (6.0–9.0). Photo evidence attached (After photo 3).
All process wastewater vacuumed and transported via sealed 50-gallon tank to authorized disposal facility (Southwest Waste & Recycle, 1200 S. 7th Ave, Phoenix AZ 85007). No discharge to storm drain, impervious surface, or adjacent vegetation.
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