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Work Plan for Expedited Additional Site Assessment Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Proposal Number P14-129814.4 May 5,2015 Page 14 that the lateral could extend west of the dry cleaners suite and possibly conned to a sewer main within the residential neighborhood west of the shopping center. The local topography slopes gently to the northeast; • Collect a groundwater sample adjacent to the north of the dry cleaner suite. While this sample is being analyzed, collect a groundwater sample from a boring approximately 100 feet north- northeast of the dry cleaner suite; • Collect a groundwater sample to the east and west of the"100-foot distance" boring mentioned above; • At that point,the additional four samples would be collected either south-southwest and closer to the dry cleaner suite or north-northeast and downgradient of any of the three locations that would be approximately 100 feet from the dry cleaner suite(as noted above). • Three five-foot deep soil gas samples, one soil sample, and one groundwater sample will be collected from borings advanced adjacent to the north-south boundary of the subject property contiguous to the site associated with 3301 North Tracy Boulevard. Scope Sampling procedures will conform to the requirements of the DTSC, the Central Valley Regional Water Quality Control Board (CVRWQCB) and the United States Environmental Protection Agency (USEPA). A state-certified laboratory will analyze the samples and the project will be performed under the responsible charge of a qualified environmental professional. Analytical results will be compared to the CVRWQCB's August 2104 Water Quality Goals(groundwater),the DTSC's July 2014 Once of Human Health and Ecological Risk, Human Health Note Number 3 (soil gas) and the August 2012 State Water Resources Control Board's Low-Threat Underground Storage Tank Case Closure Policy(soil). Partner will perform the following tasks for the Subsurface Sampling: • Revise the existing site-specific health and safety plan; • Notify Underground Service Alert North a minimum of 48 hours prior to drilling activities to clear public utilities; • Retain a private utility locator to clear and identify buried utilities using terrain conductivity and ground penetrating radar tools; • Secure the necessary boring permit from the SJCEHD. Permit acquisition will involve submitting a completed application and site plan to SJCEHD for review and approval. The turnaround time for SJCEHD to issue the permit is expected to be no more than 10 days; • Schedule an inspection by SJCEHD a minimum of two days prior to drilling activities; • Advance ten direct push borings as described above to a terminal depth of up to 15 feet bgs,collecting a grab groundwater sample at the terminal depth; • Analyze the ten groundwater samples with a mobile laboratory in accordance with EPA Method 8260; • Install three 5-foot deep soil gas probes in the northeastern portion of the subject property and collect three soil gas samples for analysis of BTEX in accordance with Method TO-15;