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COOK • • SERVICES, JC. GENERAL ENGINEERING CONTRAr-TOR A. HAZ #921387 RECEIVED DEC 10 Z015 October 20, 2015 ENVIPRE MITESERVICTAL ELTH Brian Hanson Maintenance Team Lead Synergy Health 6801 Longe St. Stockton, Ca. 95206 Subject: Pit Inspection at Synergy Health 6801 Longe Streei, Stockton,CA Dear Mr.Hanson, Cook Environmental Services inspected two concrete pits at the Synergy Health Stockton facility located at 6801 Longe Street, Stockton, California (see Figure 1) on October 10, 2015 to satisfy the requirements of the California Health and Safety Code Section 25144.6(c)(2). The inspection was conducted in response to a Notice of Violation (NOV) issued by the San Joaquin Environmental Health Department dated April 7, 2014. Synergy Health uses the two concrete pits to process waste washwater from an industrial laundry. The purpose of the inspection was to determine if the pits are constructed of materials that are impervious under the conditions of use and whether cracks, fractures or other defects in the concrete pits are providing a pathway for wash wastewater to impact subsurface soils and/or groundwater beneath the facility. Both pits were inspected immediately after Fremouw Environmental Services (FES) had cleaned the pits with a pressure washer and removed all rinse water using a vacuum truck. The two wastewater pits are located in a boiler room, which is in the southeast corner of the building. The Recycle Water Pit processes rinse water which after processing is recycled to the laundry. This pit is approximately 8 feet wide x 8 feet long x 7 feet deep. The Waste Water Pit contains wash water that is pH balanced prior to discharge to the City of Stockton sewer system. This pit is approximately 16 feet long x 8 feet wide x 7 feet deep. According to drawing B 20- 4592 prepared by Kemco Systems Inc. and dated November 16, 1998 the pit is comprised of poured in place concrete that is approximately 8-inches thick. The walls at the bottom of the pit are sloped toward the center. There is a center of the bottom of each pit is flat and is approximately 2 feet wide. The drawing for both pits is shown on Figure 2. I noted the presence of two 55-gallon drums of concentrated sulfuric acid above the Waste Water Pit. One of the drums was attached to a metering pump. Reportedly, the pH of the waste water ranges from 10 to 12. The metering pump adjusts the pH to<9 prior to discharge to the sanitary sewer. Sulfuric acid is delivered to the bottom of the pit and a mixing propeller is located approximately 3 feet above the discharge point for the acid. I entered the Waste Water Pit under confined space protocols at approximately 10:30 am on October 10, 2015. I noted that the flat portion of the bottom of this pit is badly etched. The aggregate in the concrete is raised approximately '/i inch above the concrete in places. This y 14B5 TREAT BLvo., STE. 203A WALNUT CREEK, CA 94597 R: [925) 47B-6390 F: 1225) 478-B394 -WWW.COOKENVIRONMENTAL.COM