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Delineation and Destruction Work Plan for Well B-1 Contaminants of concern at the site include chlorinated volatile organic compounds (VOCs). Historically, the highest concentrations of contaminants of concern in well B-1 were detected in 1987; 1,1-dichloroethene was detected at a concentration of 16 micrograms per liter(µg/L), 1,1,1- trichloroethane at 56 µg/L, 1,1-dichloroethane at 2.7 µg/L, tetrachloroethene at 6.2 µg/L, and trichloroethene at 3 µg/L. Total petroleum hydrocarbons (TPH) and related fuel constituents are not contaminants of concern for the site. 2 DELINEATION OF IMPACTS FROM UNAUTHORIZED RELEASE 2.1 Discovery of Oily Substance and Notifications Dudek discovered the oily substance in well B-1 on October 7,2013,while conducting water level measurements at the site.Upon arriving at well B-1,Dudek noticed the well box lid was unsecured and there was a petroleum-like odor in the immediate area. Upon opening the well box, Dudek discovered that the locking well cap was loose, and black oily staining was visible on the inside of the PVC well casing. Dudek attempted to measure the water level;the bottom few feet of the water level tape and sounder came up from the well coated with a black liquid emitting a petroleum odor. Dudek returned on October 11, 2013, with an oil-water level probe and measured 3.3 feet of oily substance. During the previous inspection on July 17, 2013, there was no evidence of a black oily liquid, and the well box lid and locking well cap were secured and in good condition. Therefore, the incident occurred between July 17, 2013, and October 7, 2013 (Dudek 2014; DTSC 2016). Dudek notified the property owner of the issue with well B-1 and installed a new locking well cap and new well box. Dudek notified the County on October 7,2013, the day of discovery. A County inspector was on site at the time, observing the soil vapor sampling that Dudek was also conducting. Dudek notified DTSC the following day, October 8, 2013, of the issue (DTSC 2016). The County EHD reportedly conducted an inspection the following week and issued a Notice to Abate to Empire Real Estate, the site owner; however, Kearney and Dudek were not notified of this interaction and did not learn of it until the 2017 Groundwater Audit Inspection Report was issued(Dudek 2017a). Dudek continued to observe the oily substance in well B-1 during the four 2014 sampling events; they did not encounter an increase in oily substance or other evidence of additional releases(Dudek 2015). During the 2015 sampling events, well B-1 was reported as dry; however, a black oily substance was discovered on the sounder upon reeling it back to the surface (Dudek 2016). In February 2016, DTSC issued a memorandum summarizing the events related to well B-1. This memorandum did not include instructions for a response or a request for further information (DTSC 2016). 10886-7 DUDEK 3 January 2019