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Proposal for Phase II Subsurface Investigation Space Station Mini Storage 2051-2055 West Lane Stockton, California 95205 Partner Proposal Number 15-137439.1 April 23, 2015 Page I 2 groundwater in the vicinity of the subject property is inferred to be approximately 43 to 45 feet below ground surface (bgs) with flow direction to the northeast. The subsurface is expected to consist of gravels, sands, silts and clays to at least 25 feet bgs. Objective The main objective of the project will be to identify the location of the septic system leach field and to investigate the potential impact of petroleum hydrocarbons and VOCs to soil as a consequence of a release or releases from the septic system. To investigate the identified REC, Partner will conduct a Phase II Subsurface Investigation. The investigation scope will include a geophysical survey and the advancement of five borings to facilitate the collection and analysis of soil samples. If soil impacts are observed/recorded, the investigation scope will not be sufficient to evaluate the extent and magnitude of subsurface impacts and additional laboratory analysis and/or sampling beyond the proposed scope may be required. Scope Sampling procedures will generally conform to the requirements of the SWRCB and the United States Environmental Protection Agency (EPA). A state-certified laboratory will analyze the samples and the project will be performed under the responsible charge of a qualified Partner representative. Laboratory results will be compared to September 2010 California Human Health Screening Levels (CHHSLs), the November 2012 SWRCB Low-Threat Underground Storage Tank Case Closure Policy, and the January 2015 EPA Region 9 Regional Screening Levels. Partner will perform the following tasks for the Phase II Subsurface Investigation: Prepare a site-specific health and safety plan; Notify Underground Service Alert North (USAN) a minimum of 48 hours prior to drilling activities to clear public utilities; Secure the necessary Boring Permit from the San Joaquin Valley Environmental Health Department (SJVEHD). Permit acquisition will involve submitting a completed application and site plan to the SJVEHD for review and approval and remitting the necessary fees. The turnaround time of the SJFEHD to issue the permit is expected to be no more than two weeks; Notify the applicable regulatory agencies a minimum of five days prior to drilling/backfilling activities; Trace the septic line to the leach field through a geophysical survey. Additionally, clear boreholes of utility lines through a geophysical survey, boring placement will be modified as necessary based on the geophysical survey results to avoid damaging underground features; Advance three borings in the vicinity of the septic leach field to a terminal depth of 20 feet bgs, collecting soil samples in five-foot intervals from five feet bgs to the terminal depth; Advance two borings in the inferred vicinity of the effluent line to a terminal depth of five feet bgs, collecting soil samples at the terminal depth; Field-screen each soil sample using a photoionization detector (PID); Prepare up to 14 soil samples for laboratory analysis; PARTNER