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Page 10 250-gallon grease trap West along Magnolia 250 gallons (N/A) Tank is double walled St. to catch basin Area C—530 Building 250-gallon diesel fuel Southeast towards on- Tank is double wall, tank (AST) site catch basin with 250 gallons 75 gallons placed within open top bio-filter screen diked generator base Area A: The 10,000-gallon AST is double walled UL approved and thus fully complies with secondary containment. The AST sits within a 10-foot tall masonry enclosure with limited access. It also has spill containment bucket, interstitial monitoring of tank bottom, and flow shut-off. Because this AST is a double-wall tank, the greatest risk for a potential spill exists during the refilling process. The 10,000-gallon AST is filled approximately once every six months. In the event of a spill during refilling, the pipelines would be shut off immediately. Absorbent waddles will be placed to contain the spill area and sorbent material will be used to collect the spill material. The liquid waste will be disposed of using clean 55-gallon containers and the pavement steam cleaned. The bio-filters installed in the storm drain catch basins closest to the AST will aid in preventing petroleum from entering the storm drain system. These catch basins are labeled in the Spill Prevention Control and Countermeasure Plan in Appendix A. If a leakage/spill occurred from the diesel supplier's tank connecting hose while filling up the 10,000-gallon AST, the direction of flow runs South and East towards the identified emergency ready storm drains. The tanker's truck estimated flow rate is 1 to 75 gpm (tanker truck has a variable speed pump)with an approximate full volume of 4,000 gallons. The two (2) 150-gallon day use tanks in the generator room are double walled UL approved and thus fully comply with secondary containment. Both tanks have high and low liquid level audible alarms (§112.8(c)8(i)) and leak detection, and they also have overflow alarms. The two SST Series day tanks are equipped with an overflow pipe back to the main storage tank— in this case the 10,000-gallon AST. These tanks have an overflow backup pump with an audible alarm. In the unlikely event of the rupture of a double walled 150-gallon tank, the spill rate would be approximately 150 gal/hr. Most of the spill would be contained within the open top dike, but if the spill overflowed the containment, the spill would stay within the generator room. Absorbent waddle would be placed to contain the spill area and absorbent material would be used to collect spill material and it would be properly disposed. Inside the generator room there is a drain that is connected to the City of Stockton Municipal Stormwater System, and therefore must be protected with a spill barrier immediately. Area B: The 6,000-gallon UST(exempt) is double walled, fiberglass UL approved tank and has a leak detection system for both vapor and liquid. The 275-gallon day tank is placed inside a spill containment berm with the possibility to hold its entire volume if it was to completely spill. If a leak occurred due to a rupture, a probable spill rate would be 275 gal/hr. Dameron Hospital Spill Prevention Control and Countermeasure Plan June 29,2020