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2.2 Project History According to the December 2004 A/E West Consultants, Inc. (A/E) Phase I ESA report (and confirmed by Partner in a Phase I completed on the shopping center in December 2014), Quality Cleaners was operating in the shopping center at 3081 North Tracy Boulevard. Quality Cleaners reportedly used PCE in a closed loop system as part of the dry cleaning process. A review of the hazardous waste information system (HAZNET) identified Quality Cleaners as a facility that maintained liquids containing halogenated organic compounds for the dry cleaning process. A review of on-site paperwork indicated that the waste material was stored in a 55-gallon drum prior to removal from the property and disposal by Technichem of Emeryville, California. The current owner of the dry cleaning facility was reported to be in the process of obtaining a new dry cleaning machine that did not employ the use of PCE in the cleaning process. At the time of the A/E Phase I, Quality Cleaners had been a tenant from April 1992 to September 2007 at the shopping center. A dry cleaner checklist completed by A/E indicated that one floor drain was present in a room adjacent to the dry cleaning machine and was connected to the sewer system. In addition, the dry cleaning machine was manufactured in 1991. During Partner's December 2014 Phase I ESA,Partner noted the presence of a dry cleaning tenant known as Quality Cleaners.According to an interview with the property manager,this facility has operated as a dry cleaning facility since 1992. Although the current closed-loop dry cleaning machine (installed in 2007) used a hydrocarbon-based solvent (DF-2000 Aliphatic Hydrocarbon Fluid) for dry cleaning purposes, the prior closed-loop dry cleaning machine (operational from 1992 to 2007),used PCE during the dry cleaning process. Partner observed two 55-gallon steel drums (one containing new DF-2000 Aliphatic Hydrocarbon Fluid and one containing dry cleaning process waste sludge) adjacent to the dry cleaning machine. Steel secondary containment was noted around the dry cleaning machine. According to a May 2014 report prepared by the Local Hazardous Waste Management Program in King County (LHWMP, 2014), Washington, a coalition of local governments, a chromatogram from a gas chromatography-flame ionization detection (GC-FID) analysis of the DF2000 solvent displayed chromatographically as a mound that contained multiple peaks. Therefore,DF2000 was confirmed to be a multicomponent hydrocarbon,with carbon chain lengths predominantly between C-10 and C-12. Analysis via gas chromatography-mass spectrometry (GCMS) confirmed the GC-FID analysis. Although several peaks representing substituted alkanes were identified below C-10 in the GCMS analysis, neither toluene nor benzene was detected in the solvent sample. No significant staining or cracking was observed in the area around the dry cleaning unit or around the hazardous waste storage area. According to the most recent waste manifest present in December 2014, Technichem, a licensed transporter of hazardous waste, collected the waste sludge. Sampling and Analysis Workplan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 4