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materials. Most of the drums were observed to be without labels, or to have unreadable labels. Several drums labeled as acetone were visible. In addition, there were several smaller containers of other wastes stored. Wastes included hydraulic fluid and other petroleum chemicals. According to an employee, most of the drums contained hydraulic oil, old resins or acetone. A facility housekeeping activity was conducted by staff of Elegant Surfaces; removal of the waste (approximately 220 gallons) was completed in October 2012. All fluids collected were transported to Evergreen Oil for recycling under manifest number 009940094. Phase I/RCRA Facility Assessment (RFA) and Closure Report On October 12, 2012, the property owners entered into a Facility-Initiated Corrective Action Agreement with DTSC to complete a RCRA Facility Assessment and Closure of the permitted units. The RFA addresses the seven SWMUs, previously identified by DTSC in a 2004 inspection of the facility, and two AOC identified during the development of the RFA. Various revisions of the RFA and Closure Report were submitted to DTSC between October and December 2012; final DTSC approval of the Phase I/RFA and Closure Report was issued on March 26, 2013 following the end of a 30-day public review and comment period. The 30-day public review and comment period ran from February 7, 2013 through March 8, 2013. No written or verbal comments on the proposed corrective action complete determination were received by DTSC during the review and comment period. Health Risk Assessment The following standards were used as threshold levels in determining the need to perform a health risk assessment: the California Environmental Protection Agency (Cal EPA) Human Health Screening Levels (CHHSLs, September 2010), U.S. EPA Screening Levels (formerly known as preliminary remediation goals), California Department of Health Services Maximum Contaminant Level (MCL, May 2009) for drinking water standards. The results of laboratory analysis for soil and groundwater samples collected at the site were compared with one or more of the established chemical concentration screening levels citied in the above regulatory standards. These results indicate that the need to perform a health risk assessment is not necessary. Site Investigations In June 1995, SMITH Environmental Technologies, Inc., on behalf of OIT, conducted a subsurface site investigation to develop a baseline soil and groundwater quality data set for the property. Three ground water wells (MW-1 through MW-3) were advanced to a total depth of 36 feet bsg for collection of soil and grab ground water samples. Analytical results of soil samples indicate that cyanide, total oil and grease (TO-G), pesticides and polychlorinated biphenols (PCBs), volatile organic compounds (VOCs), and semi-volatile organic compounds (SVOCs) were not reported above laboratory detection limits. Chloroform was detected at a concentration of 2.2 micrograms per liter (Ng/1) in a single ground water sample collected from well MW-2. Furthermore, low concentrations of antimony, beryllium, chromium, copper, lead, nickel and zinc were detected in the soil samples collected. Levels of metals detected within soil samples did not exceed CHHSLs for a commercial/industrial land use. Low concentrations of metals detected in ground water well samples did not exceed MCL drinking water standards. Statement of Basis for Former Advanced Interconnect Technologies, Inc. Facility Page 9 of 15