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Irerracon LIMITED SITE INVESTIGATION VACANT PROPERTY 23577 S. MOUNTAIN HOUSE PARKWAY TRACY, SAN JOAQUIN COUNTY, CALIFORNIA Terracon Project No. NA197074 November 13, 2020 1.0 SITE DESCRIPTION The site is an approximately 135-acre tract of land located at 23577 S. Mountain House Parkway, Tracy, San Joaquin County, California (assessor's parcel number [APN] 209-080-26). The site currently consists of vacant land (see Exhibit 1 —Topographic Map). A former Chevron pipeline (currently owned by Crimson California Pipeline) and two PG&E natural gas pipelines run through the southwestern corner of the property within a 50-foot-wide easement from northwest to southeast. The Crimson pipeline has operated since 1952 and transports crude oil from Kern County to refineries in the San Francisco Bay Area. On December 4, 2003 a farmer ruptured the Chevron crude-oil pipeline with a piece of farming equipment which resulted in an oil spill at the property estimated by Chevron to be 31,500 gallons. An estimated 16,800 gallons of oil was cleaned up by the excavation of the impacted soil and vacuuming free-product. Approximately 14,700 gallons of oil was estimated to remain in the subsurface soil. The excavated area near the pipeline release is still visible at the site. In March 2004 Kleinfelder submitted a work plan for limited soil and groundwater assessment in the vicinity of the ruptured former Chevron pipeline. In 2005 Kleinfelder implemented the scope of work as described in the work plan and collected soil samples. Based on the Kleinfelder assessment TPH was identified in soil borings in the area of the excavation. As a requirement of the SJC-EHD, and to comply with the requirements of the SSCR, the following LSI is proposed to collect data from the property to addend the SSCR currently in review with the SJC-EHD. A Topographic Map showing the site location is included as Exhibit 1, a Site Diagram showing an satellite image of the site is included as Exhibit 2, and a site detail showing boring locations is included as Exhibit 3 in Appendix A. At your request, Terracon performed the LSI to respond to the SJC-EHD letter dated August 15, 2019, which identified the following environmental site concerns. 2003 Chevron Pipeline Crude Oil Release: On December 4, 2013 a piece of farming equipment ruptured a former Chevron crude oil pipeline that bisects the subject property. Approximately 31,500 gallons was released, 16,800 gallons was estimated to have been recovered, and 14,700 gallons remain in onsite soils. Some of the impacted soil was relocated to the southern portion of the property and stockpiled. The site was assessed in 2005 by Kleinfelder. Soil impacts of total Responsive■ Resourceful ■ Reliable