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WORK PLAN FOR LIMITED SITE INVESTIGATION Irerracon Premium California Orchards, Tracy, California January 8, 2021 Terracon Project No. NA207103 The soil samples will be collected into laboratory-prepared containers. The containers will be labeled and placed on ice in a cooler. The soil samples and completed chain-of-custody forms will be transported to a State of California-certified laboratory for analysis. Groundwater Sampling At the completion of drilling, the 50-foot soil boring will be completed as a temporary sampling well (TSW) for the collection of groundwater. The TSW will be constructed by installing 10 feet of 1- inch diameter, 0.010-inch machine slotted PVC well screen with a threaded bottom cap, with 1- inch diameter, threaded, flush-joint PVC riser pipe to surface. The TSW will be left in-place long enough to allow time for enough groundwater to accumulate and be sampled. The groundwater sample from the TSW will be collected using a new disposable polypropylene bailer or low flow sampling equipment and new disposable tubing. The groundwater samples will be collected into laboratory-prepared containers. The containers will be labeled and placed on ice in a cooler. The samples and completed chain-of-custody forms will be transported to a State of California-certified laboratory for analysis. 2.6.2 Boring Abandonment Terracon will schedule the backfilling inspection with the SJCEHD no later than 48 hours prior to planned field work activities to ensure the availability of an SJCEHD representative. Additionally, Terracon will confirm the field work date and inspection time with the inspector 24 hours prior to field work. At the completion of sampling activities and in the presence of an SJCEHD representative, the soil borings will be backfilled using neat cement. A tremie pipe will be lowered to within 3 feet of the bottom of the boring and the cement slurry will be deposited into the borings via the tremie pipe. 2.7 Investigative Derived Waste Based on the method of investigation proposed for the site (direct push continuous coring), two 55-gallon drums of IDW is anticipated to be generated during this scope of work. The IDW, expected to be non-hazardous, will be properly labeled and disposed of as part of this scope of work. 3.0 GENERAL COMMENTS The scope of services is based on the assumptions and limitations noted below. Responsive■ Resourceful ■ Reliable 5