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Pit Inspection October 20,2015 <br /> Synergy Health Proposal No.1133 <br /> Stockton,CA Page 2 <br /> suggests that the sulfuric acid has compromised the integrity of the concrete. Likewise, the east <br /> wall of the pit in the vicinity of the acid mixing process is badly etched. The concrete is also <br /> etched beneath a 4-inch drain line that is located on the north wall in the northwest corner of the <br /> pit and beneath an 8-inch drain line located along the north wall in the northeast portion of the <br /> pit. <br /> I entered the Recycle Water Pit under confined space protocols at approximately 11:00 am. I <br /> noted moderate etching of the concrete along the base of the sloping floor on the south side of <br /> the pit, severe etching at the bottom of the west wall in the northwest corner of the pit and <br /> moderate etching sloping floor in the northeast portion of the pit. There are vertical lines that are <br /> spaced approximately every 4 feet along the interior of this pit. These lines may be from <br /> plywood forms used during the concrete pour. In addition, the concrete around the 24" x 24" <br /> manway cover in the northeast corner of the pit is severely eroded. <br /> No obvious cracks and fractures were observed in the walls or the floor of either pit. It appears <br /> the concrete etching in the Waste Water Pit is cause by the addition of concentrated sulfuric acid. <br /> It is uncertain whether the etching of the concrete pits is providing a pathway for wash water to <br /> impact subsurface soils and/or groundwater beneath the facility. However, concrete is not an <br /> compatible material to construct a process tank in which concentrated acid is used for pH <br /> adjustment. At a minimum, an epoxy coating that is non-reactive to concentrated acids should <br /> be applied to form an impervious seal. <br /> If you have any questions regarding this report or if there is additional information you require please <br /> contact me at(925)478-8390. <br /> Very truly yours, <br /> EGLI <br /> Cook Environmental Services,Inc. E-U) <br /> C <br /> / Q�pFESS/pDF <br /> l, <br /> ✓'� kQ�oO�NY D,L,'�f�, <br /> Tim Cook,P.E. y oo ENVIRONMENTAL <br /> President c� E- x m <br /> usCC <br /> NO.C054038 m <br /> CIVt1. <br /> OF'CAUF4Q� <br />