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Work Plan for Phase II Subsurface Investigation 14800 West Schulte Road Tracy, California 92612 Partner Project Number 18-217440.1 July 2, 2018 Page I 3 To investigate the identified RECs, Partner will conduct a Phase II Subsurface Investigation. The investigation scope will include the advancement of 10 borings to facilitate the collection and analysis of soil and/or soil gas samples. Scope Sampling procedures will generally conform to the requirements of the San Joaquin County Environmental Health Department (SJCEHD), 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 with San Francisco Bay Regional Water Quality Control Board (SFRWQCB) Environmental Screening Levels (ESLs). Partner will perform the following tasks for the Phase II Subsurface Investigation: Prepare a site-specific health and safety plan; Secure the necessary drilling permit from the SJCEHD. Permit acquisition will involve submitting a completed application and site plan to the SJCEHD for review and approval and remitting the necessary fees. The turnaround time of the SJCEHD to issue the permit is expected to be no more than two weeks; Notify the applicable regulatory agencies a minimum of two business days prior to drilling/backfilling activities; Notify Underground Service Alert North (USAN) a minimum of two business days prior to drilling activities to clear public utilities; Perform a geophysical survey on the northwest and south-central portions of the subject property to identify the location of former on-site tankholds and/or existing USTs, piping, and/or associated features and to additionally clear boring locations of utilities. Boring placement will be modified as necessary based on the geophysical survey results to avoid damaging underground features; Advance six borings throughout the subject property (with a bias towards repair operations, paint booth operations, used sand blast media, surface staining, hazardous materials storage areas, sumps, drains, etc.) to a terminal depth of 10 feet bgs, collecting soil samples at two, five, and 10 feet bgs; Advance four borings in the vicinity of the former fuel USTs and gasoline station operations (based on data from the geophysical survey and/or historical records) to a terminal depth of 20 feet bgs, collecting soil samples in five-foot intervals from five feet bgs to the terminal depth; Soil samples will be collected using a two-foot long by 1.5-inch diameter sampler with a two-foot long acetate liner and sampling point. The sampler will be advanced by a direct-push drill rig using four- foot long (three-foot long for the limited-access rig) by 1.25-inch diameter hollow rods with the inner rods in place. At approximately one foot above the desired sampling depth, an inner rod was removed and the sampler was advanced to the desired sampling depth to allow undisturbed soil to enter the sampling liner. The sampler will be retrieved from the subsurface and the soil-filled liner will be removed; Each acetate liner will be cut using a hacksaw or pipe-cutter and the soil samples will be collected in a four-ounce jar and three VOAs according to EPA Method 5035. The jars and VOAs will be labeled for identification and stored in an iced cooler. The soil in the liner will be visually inspected for discoloration, monitored for odors, classified in accordance with the Unified Soil Classification System (USCS), placed in a sealable plastic bag, and field-screened with a photoionization detector (PID); Prepare up to 34 soil samples for laboratory analysis; PARTNER