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Limited Site Assessment Work Plan Hydrogeological 2413/2417 West Lane Associates Stockton,San Joaquin County,CA the Regional Water Quality Control Board under the Site Cleanup Program in 2012. There is not currently an open environmental case at the R&L Diesel property. Scope of Work The scope of work presented in this work plan is designed to address Recognized Environmental Conditions identified in the December 2016 Phase I Environmental Site Assessment prepared by Advanced GeoEnvironmental, Inc., with the exception of the vapor encroachment issue in the vicinity of the former waste oil tank, which has been documented to have received closure by both San Joaquin County and the Regional Water Quality Control Board. Seven shallow borings will be advanced through the use of a direct push rig at the following locations: • The current steam cleaning location on the central portion of the site (which also overlaps with the former septic system). • The former steam cleaning location on the western portion of the site. • The location of the former 1,000 gallon gasoline LIST and associated fuel pump removed in 1957 • The current septic system location. • The location of the former diesel and gasoline LISTS removed from the site in 2007. • A former truck lift area. • A sample location near the center of the site to address background concentrations. Proposed boring locations are shown on Figure 2. Soil Sampling Soil sampling will be completed using direct push technology at the six locations proposed on Figure 2. Each boring will be advanced to approximately 15 feet below grade and two soil samples are planned to be collected per boring. Soil cores will be continuously collected using disposable acetate liners. Soil samples will be collected at approximate depths of 10 feet and 15 feet below grade. Sample depths may be adjusted based on visual evidence of impacted soils. Each boring will be geologically logged. Soil samples will be submitted to a California-certified hazardous materials testing laboratory for analysis for Total Petroleum Hydrocarbons as gasoline, diesel and oil and grease by EPA Method 8015M and benzene, toluene, ethylbenzene and total xylenes and solvents by EPA Method 8260B. Reporting A Limited Site Assessment letter report will be completed detailing the methodology and results of soil and soil vapor sampling. The report will include the laboratory analytical reports, geologic boring logs and other relevant field logs. Final boring locations will be presented on figures. Analytical results will be summarized in tables. The report will also include recommendations, as necessary. 3