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0 Partner Project No. 14-117725.1 April 4,2014 Page 2 To evaluate if a release has occurred from the current and former on-site industrial operations, Partner will conduct a Phase I1 Subsurface Investigation. The investigation scope will include a geophysical survey and the advancement of 12 borings to facilitate the collection and analysis of soil samples (Please see attached map for proposed boring locations). The main objective of the project will be to provisionally identify the location of on-site USTs, former tankholds, and/or other associated features and to provisionally investigate the potential impact of petroleum hydrocarbons, volatile organic compounds (VOCs), and/or metals to soil as a consequence of a release or releases from the current and former on-site industrial activities. Scope Sampling procedures will conform to the requirements of the SWRCB, the San Joaquin County Environmental Health Department (SJCEHD), and the Environmental Protection Agency (EPA). A state-certified laboratory will analyze all samples and the entire project will be performed under the responsible charge of a registered professional civil engineer or geologist. Partner will perform the following tasks for the Subsurface Sampling: • Prepare a site-specific health and safety plan; • Notify Underground Service Alert (USA) a minimum of 48 hours prior to drilling activities to clear public utilities; • Secure the necessary boring permit from the EHD. Permit acquisition will involve submitting a work plan, completed application, Master File Record Information Form, driller letter of authorization, and site plan to the EHD for approval and remitting the necessary fees; • Advance two borings in the vicinity of the former USTs (based on data from the geophysical survey and/or historical records)to a terminal depth of 15 feet bgs, collecting soil samples in 5-foot intervals from 5 feet bgs to the terminal depth; • Advance two direct-push borings in the vicinity of the drum storage area(northwem shed)to a terminal depth of 10 feet bgs, collecting soil samples in 5-foot intervals from 5 feet bgs io the terminal depth; • Advance two direct-push borings in the vicinity of the former oil house and former oil AST (based on historical records) to a terminal depth of 10 feet bgs, collecting soil samples in 5- foot intervals from 5 feet bgs to the terminal depth; • Advance six direct-push borings throughout the subject property in the vicinity of the former and current hazardous materials storage areas (including the area of the maintenance pit) to a terminal depth of 10 feet bgs, collecting soil samples in 5-foot intervals from 5 feet bgs to the terminal depth; • Field-screen each soil sample using a photoionization detector(PID); • Prepare up to 26 soil samples for laboratory analysis; • Based on field-screening results, analyze one soil sample per boring (12 soil samples total) for carbon chain total petroleum hydrocarbons (TPH-cc) in accordance with EPA Method 8015M and VOCs in accordance with EPA Method 826013; • Additionally analyze up to six soil samples for California Administrative Manual 17 Metals in accordance with EPA Method 6010/7471; PARTNER