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Mr. Alan Buehler, P.G., RWQCB May 18, 2018 Work Plan for Additional Site Investigation Project No. 2092-2057-01 2057 South El Dorado Street, Stockton, CA Page 4 Collect soil samples from boring CPT-8. The proposed scope of work has been subdivided into four tasks, as outlined below. Details are provided for the activities associated with each task. All work will be conducted under the direct supervision of a State of California Registered Geologist or Civil Engineer and will be conducted in accordance with standards established by December 2015 LUFT Manual and SJCEHD guidelines. Task 1: Pre-Field Activities Following approval of this document by the RWQCB, the following activities will be completed: Obtain right-of-entry agreements, as necessary, to enable advancement of borings CPT-5 through CPT-8. Obtain drilling permit(s) from SJCEHD, Retain and schedule a licensed C-57 drilling contractor, Update the Health and Safety Plan for the Site, Mark drilling locations and contact Underground Service Alert (USA) to locate underground utilities in the vicinity of the work site, and Notify the RWQCB, SJCEHD, USA, and the affected property owners of the scheduled field activities. Task 2: Field Activities Task 2A: CPT Soil Borings and Groundwater Sampling Stratus will oversee a California licensed drilling contractor advance borings CPT-5 through CPT-8 to an approximate depth of 120 feet bgs. The proposed locations of the borings are shown on Figure 3. The actual locations of the borings will be based on accessibility and the location of underground utilities, as determined by the geologist in the field. CPT consists of advancing a cone-tipped cylindrical probe (1.7 inches in diameter) into the ground while simultaneously measuring the resulting resistance to penetration. A computer generated CPT log is plotted in the field, providing a continuous log of Site lithology. The CPT log will be uploaded to the State Water Resources Control Board's GeoTracker website. Upon completion of CPT profiling, the boreholes will be pressure grouted from the bottom of the borehole up to surface grade. Following the CPT work, groundwater samples will be collected from separate borings, located approximately 2 feet from the initial CPT-5 through CPT-8 borings. A minimum of five groundwater samples will be collected adjacent to CPT-5 through CPT-8. KAQuick N Save #2 \Work Plans\Q-N-S#2-WP-2018.doc STRATUS