COMPLIANCE INFO 2016 - 2017 - Laserfiche WebLink

Home Browse Search

to the east end of the reactor building, where a weir traps particulates before discharging into a pipeline to Grit Pond 41. Grit Pond #1 has a capacity of approximately 151,900 gallons; therefore, all water from the reactor was contained within the pond. The grit pond only receives water during routine and non- routine maintenance, such as the discharge of water following the lamp break, and when rainfall totals are sufficient to temporarily produce standing water. Photographs of the reactor, trench drain, and collection pond are included in Attachment C. After the reactor was drained, reactor covers were then removed to inspect the damage to the lamps. Additional mercury vapor monitoring was conducted adjacent to reactor, with mercury vapor readings of 0.03 units. Therefore, the exclusion zone was expanded and secured. On 12/08/16, site personnel donned PPE and checked mercury vapor levels; all readings were non - detect. Therefore, routine site operations, including calibration activities at other reactors, resumed. Response activities resumed on Saturday, 12/10/16. Mercury vapor levels were checked and the top access covers were removed. The exclusion zone was reduced based on non -detect vapor levels. The Debris in the reactor, including broken glass and quart sleeve material, was removed through the 6 -inch access port below the lamp array. No mercury globules were visible within the reactor. Continuous mercury vapor monitoring was conducted during cleanup activities. On 12/11/16, the area around the reactor was swept with a broom to remove broken quartz glass as directed by SFPUC Health and Safety. The waste debris from both inside and outside the reactor was contained in a 5 gallon bucket and labeled for disposal. PPE used during the cleanup was also double bagged and labeled for disposal. The waste was picked by a hazardous waste transporter on 01/19/17 and delivered to the permitted waste facility in Fernley, Nevada, which is operated by 21" Century Environmental Management of ]Nevada. The manifest signed by the transporter is included as Attachment D. Notifications W On 12/07/16, a WSTD incident report was completed and SFPUC notified the San Joaquin County Environmental Health Department (SJEHD). o On 12/8/16, SFPUC received a Notification to Abate from the SJEHD, requiring disposal of the associated - waste and investigation and abatement of potential contamination. Elena Manzo, SJEHD, conducted a -4 3 site inspection on 12/09/17 and met with site personnel about the incident. SFPUC provided additional _-D information to SJFHD on 12/13/17. Water Quality and Sediment Sampling On 12/09/16, site personnel collected water quality samples from the grit pond and sent the samples to the SFPUC laboratory to be analyzed for mercury using EPA Method 245.1. These samples were analyzed outside of holding times and the results, included in Attachment E, should be considered as estimated. On 01/5/17, additional water quality and sediment samples were collected by AEW Engineering and submitted under chain -of -custody to McCampbell Analytical Laboratory in Pittsburg, California, for mercury analysis under EPA Method 200.8 for water samples and SW 7471E for sediment samples. Water quality samples were collected from the trench drain, which had accumulated approximately 3 inches of standing water as a result of plant shut down activities during the ongoing water supply shutdown, and the inlet to the grit pond. The mercury concentration in both water quality sample from the trench drain were less than the reporting limit of 0.05 µg/L, although mercury was detected in the sample from the grit pond at a concentration of 0.047 µg/L (Attachment E). W