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Complaint Investigation Summary Report #. 5105 COMPLAINT ID: COGM90T6S Site Location: 7679 LONGE ST, STOCKTON, CA 95206 Activity Summary Activity Date Recorded by 08/28/2021 3 pm: Received a page from the General Hospital, Aaron Spehling, 707-601-6562 MANZO is reporting a spill of industrial wash water "dirty water" from their facility. Called Aaron, he indicated that last night one of the workers didn't shut off the freshwater supply and the equalization tank (EQ) overflowed and estimated several thousand gallons of water flowed out of the facility and into the adjacent parking lot and collected over a plugged storm drain (in a parking lot depression). Aaron tested the pH of released water at pH of 7.27. The overspill occurred around noon today. The facility is pumping all released liquid back into the waste pit and the EQ tank. This release is a second release notification received by the EHD this week. The first release notification was on 8/25/2021. 3:25 pm, I arrived on site and met with Aaron, who escorted me around the facility and the spill area— I observed a large area of free-standing liquid (approximately 150'x50') situated in the northern parking lot area. No evidence suggested that the spill escaped the facility, no injuries or evacuations were reported. The observed free-standing water didn't appear to be draining into the onsite storm drain located at the lowest point in same parking lot area (immediately under the standing liquid). Aaron indicated that the storm drain valve, located inside the storm drain sump is currently closed. Aaron also indicated that due to a human error, a supply valve was not closed and the freshwater tank overflowed, discharging the water into the wastewater pit; once the wastewater pit was full, the liquid was pumped to the EQ tank (located in the northern parking lot). The EQ tank was overfilled, resulting in liquid pouring from the top of the EQ tank and into the parking lot. Aaron indicated that the EQ tank is 108,000 gallons. According to Aaron, during normal operations, the EQ tank is pumped through the onsite hazardous waste treatment system (CE-CL) prior to the liquid discharge into the city sewer. As such, a discharge occurred from the EQ tank before the liquid could be treated by the onsite hazardous waste treatment unit, releasing hazardous waste liquid into the parking lot. All the overspilled liquid was pumped back into the onsite system by the facility personnel. Facility pressure washed the spill area and all the rinsate was also returned back into the onsite treatment system. Once all the standing liquid was pumped out, I inspected the inside of the storm drain catch basin, and observed a locked out drain plug. Some standing liquid was noted inside the catch basin sump, brought up the presence of the standing liquid to Aaron's attention, he indicated that he will contact his environmental clean up company to completely empty the catch basin. Generated inspection report for the clean-up of released hazardous waste liquid and the parking lot area, with the request to submit a written corrective action statement with a plan that would minimize the potential for future releases as well as completion of the storm catch basin clean out, emailed report to spehling-aaron@aramark.com. (3 pm-7:12 pm) 08/31/2021 Prepared Prop 65 and provided a copy for mailing MANZO 10/04/2021 Received an email on 10/1/2021 from Aaron Spehling, spehling-aaron@aramark.com, with property owner information. Updated complaint record property owner information. 01/13/2023 Reviewed complaint record, no corrective action to prevent overspills was received, however this is a permitted HW facility. Abated complaint with a reference under the site facility PR0537564. PRESTO MANZO 51carpt Page 2 of 2