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Former Unocal #6981 2 13 April 2017 Stockton, San Joaquin County The Assistant Executive Officer finds, with respect to the Responsible Party's acts, or failure to act, the following: 1. According to the 4 May 1993 Remedial Action Plan produced by Resna Industries, Union Oil Company of California (Unocal), now a wholly owned subsidiary of Chevron, purchased the existing retail gas station at 4707 Pacific Avenue in Stockton from Tesoro Gasoline Marketing Company in April 1984. 2. On 12 May 1988 Bassett Construction Company filed an Unauthorized Release Report (UARR) for the Site after discovering an unauthorized release of petroleum from the Site's UST system during system repairs on the same day the UARR was filed. Chevron is named as the Responsible Party under this Order because it, or its corporate predecessor, had control over a UST at the time of or following an unauthorized release of a hazardous substance. (Cal. Code Regs., tit. 23, § 2720.) 3. According to the 4 May 1993 Remedial Action Plan produced by Resna Industries, Unocal excavated approximately 1,600 cubic yards of petroleum impacted soil from the Site in May 1988 and upgraded the Site's UST system. 4. Between January 1990 and August 1992, Unocal installed thirteen groundwater monitoring wells, six vapor extraction wells, and one groundwater extraction well and performed vapor-extraction and groundwater pumping tests as documented in the 4 May 1993 Remedial Action Plan (RAP). 5. Between July and September 1994 Unocal installed a vapor extraction system and conducted system startup testing according to the 28 November 1994 Soil Sampling and System Startup Report produced by GeoStrategies, Inc. 6. Unocal abandoned four monitoring wells in May 1996 to facilitate road construction along Pacific Avenue according to the 9 August 1996 Second Quarter 1996 Status Report produced by GeoStrategies, Inc. 7. In August 1999 Unocal installed three groundwater monitoring wells and one sparge well according to the 15 November 1999 Well Installation and Soil Boring Report produced by Gettler-Ryan, Inc. 8. In April 2000, Unocal demolished the station facilities, removed the UST system, and excavated approximately 100 cubic yards of petroleum impacted soil according to the 29 August 2000 Soil Sampling During Station Demolition at Tosco (Former Unocal) Service Station #6981 produced Gettler-Ryan, Inc. The Site has been used as paved parking for a Target retail store since the demolition of the gas station. 9. Unocal operated the Site's vapor extraction system from September 1994 until the third quarter of 2001 removing approximately 15,000 pounds of total petroleum hydrocarbons as gasoline and 183 pounds of benzene according to Gettler-Ryan, Inc.'s Ozone Microsparge Well and System Installation Report dated 1 February 2002. 10. In November 2001 Unocal installed thirteen ozone sparge wells and began injecting ozone into the subsurface at the Site in December 2001 according to Gettler-Ryan Inc.'s Ozone