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July 29, 2021 Former Shell Service Station 2575 Country Club Boulevard, Stockton Page 2 approximately 7 feet based on previous gauging data; however, due to seasonal fluctuation, on- site wells MW-8 and MW-15 will be gauged immediately prior to drilling to confirm current groundwater conditions. Proposed locations are shown on Figure 2. Drilling and sampling procedures are described below. Pre-field activities will include: ·Updating the existing WPI Site Safety and Health Plan, as necessary; ·Securing an encroachment permit to access the proposed boring locations; ·Scheduling subcontractors; and ·Notifying Underground Service Alert at least one week prior to commencement of work to perform an underground utility clearance for the planned drilling location. Prior to any ground disturbance, a geophysical survey will be performed to locate all underground utilities in the vicinity of the proposed location(s). Due to the shallow depth to groundwater, locations will be cleared for utilities using a hand auger. Three borings will be advanced and depth-discrete groundwater samples will be collected by a state-licensed C-57 contractor. Due to the shallow water table, soil samples will be collected for logging purposes only. Details of the sampling procedures are in the table below. Number of Borings Depth of Boring Drilling Method Sample Interval Sample Method Sample Analysis 3 Estimated: 8 feet Direct Push or Hand-Held Rotohammer None Groundwater: Hydropunch Sampler Soil: No chemical analysis Groundwater: Total purgeable petroleum hydrocarbons (TPPH), BTEX, and fuel oxygenates using EPA Method 8260B Soil cuttings will be screened for volatile organics using a photo-ionization device. Soil will be examined in the field for observable signs of petroleum hydrocarbons, screened for hydrocarbon vapors using a photoionization detector calibrated to hexane, and examined for soil classification. Soil will be classified in general accordance with the Unified Soil Classification System. The soil classification and description, including blow counts, grain size, size grading, subordinate constituents, color, density, moisture content, and organic vapor readings, will be recorded on a field boring log. Groundwater samples will be collected using a HydroPunchÔ probe consisting of an outer sleeve covering a screened section. At the desired depth, the sleeve will be retracted to expose the screen. Groundwater samples will be collected by lowering a stainless steel or disposable Teflon bailer tied to nylon string thorough the drill rod and into the HydroPunchÔ probe. The collected groundwater will be poured into 40-ml VOA vials with Teflon® septa in a manner that prevents