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Privileged and Confidential, Attorney Work Product ' October 13,2017 Scope of Work for 455 E.Eleventh Street Tract/ CA 95376 February of 1994, San Joaquin County Environmental Health Department determined that no further action was required.The UST is considered an HREC. The 2017 AGE Phase I ESA recommended the collection of soil samples to assess impacts from the RECs identified at the Site.Terraphase also recommends the collection and analysis of soil-gas samples to assess volatile organic compound (VOC) impacts to the Site from the RECs and the historic UST. Terraphase also recommends the collection and analysis of one groundwater sample to assess potential impacts to groundwater beneath the Site from the RECs and HREC. Lastly,Terraphase recommends the collection of soil samples to assess the subsurface soil for the presence of organochlorine pesticides from former use of the Site for agriculture. Scope of Work The scope of work to complete the objectives of the Investigation includes the following three tasks: Task 1- Drilling, Sampling, and Laboratory Analysis Task 1 -Drilling,Sampling,and Laboratory Analysis The drilling and sampling program will include: 1. Fifteen soil samples will be collected from five different locations at 1, 3, and 5 feet below ground surface (bgs). 2. Six soil-gas samples will be collected from three locations at depths of approximately 5 and 10 feet bgs. 3. One grab-groundwater sample will be collected from the northern portion of the Site. The proposed sample locations are shown on Figure 2.The sample collection and analytical methods are described below and are organized by media to be sampled. Sub-surface sampling borings will be backfilled with cement in accordance with SJCEHD requirements. Pavement,gravel, or soil surfaces will be repaired using concrete,gravel, or soil to match original conditions as closely as possible.Spray paint used for utility clearance may remain visible for approximately one to two months. Investigation derived waste (IDW)will consist of soil boring cores, disposable sampling supplies, and decontamination rinse water.These materials will be placed into 55-gallon drum(s) and left at the Site until waste characterization and off-site disposal can be scheduled. IDW will be sampled, if necessary,to facilitate waste disposal acceptance. Task 1.1 Soil Sampling Fifteen soil samples, collected at approximately 1, 3, and 5 feet bgs and will be visually inspected and logged by a Terraphase field geologist or engineer in general accordance with the Unified Soil Classification System. The ten soil samples from the two shallow depths will be submitted to a California certified analytical laboratory following strict chain of custody procedures for analysis for CAM 17 metals using EPA Method Page 2 of 3 Terraphase Engineering Inc.