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0 Work Plan for Phase II Subsurface Investigation 14800 West Schulte Road Tracy,California 92612 Partner Project Number 18-217440.1 June 12,2018 Page 1 2 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; • Conduct pre-drilling site visit to develop boring location strategy addressing potential areas of concern; • 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; • 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 two borings in the vicinity of the existing OWS to a terminal depth of 12 feet bgs, collecting soil samples at two,five, eight,and 12 feet bgs; • Advance 10 borings throughout the subject property (with a bias towards potential releases) to a terminal depth of five feet bgs, collecting soil samples at two and five feet bgs; • 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 28 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 8015, for VOCs in accordance with EPA Method 8260, and for California Administrative Manual (CAM) 17 metals in accordance with EPA Method 6010B/7471A; and; • Samples will be transported under proper chain-of-custody protocol in an iced cooler to SunStar Laboratories, Inc. (a state-certified laboratory [California Department of Public Health Environmental Laboratory Accreditation Program Certificate Number 2250] in Lake Forest, California)for analysis; • Following sampling activities, each boring will be backfilled with neat cement grout and capped with concrete or asphalt patch to match surrounding ground;and • Prepare a report detailing field activities, methods, and findings. PARTNER