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April 18, 2019 Former Shell Service Station 2085 East Mariposa Road, Stockton Page 3 of 5 I Starting with the five-foot sample and continuing at five-foot intervals until the total depth, soil will be logged for lithology and examined in the field for observable signs of petroleum hydrocarbons, screened for hydrocarbon vapors using a photoicnization detector, and examined for soil classification. Soil will be classified in general accordance with the Unified Soil Classification System. The soil classification and description, including grain size, size grading, subordinate constituents, color, density, moisture content, and organic vapor readings will be recorded on a borm 1, g� // Groundwater samples'will be collected from the borings using a Hydropunch probe consisting of an pouter-sleeve-00—veiing a screened section. At the desired depth,the sleeve will be retracted to expose the screen. Groundwater samples will be collected by lowering a disposable Teflon or stainless steel bailer tied to nylon string into the HydropunchTM probe. Samples will then be poured into 40ml VOA vials with Teflon® septa in a manner that will prevent air bubbles from being trapped within the sample vial. Each vial will be labeled with its sample identification, recorded on the chain-of-custody document, and placed in cold storage for delivery t -the_ana ' al laboratory. Any soil generated during the assessment will be placed 55- allon drum and sealed upo completion of the work activities. Residuals will remain in the drum(s) on-site until they calr e properly disposed. To avoid cross-contamination where necessary, all reusable equipment will e broken down prior t and after each use and cleaned, using an approved non-phosphate detergent, double-rinsed in distilled water, and allowed to air dry.All work will be conducted in accordance with a WPI Site Safety and Health Plan and under the supervision of a California Professional Geologist. Soil and groundwater samples will be delivered under chain-of-custody procedures to Eurofins Calscience Environmental Laboratories, hic. of Garden Grove, California for analysis. Samples will be analyzed for TPHd and TPHg using EPA Method 8015M; and for BTEX and fuel oxygenates using EPA Method 8260B. Low Threat Closure Policy(LTCP) Compliance Site data will be collected and evaluated,where possible,using the criteria outlined in the California State Water Resources Control Board's (SWRCB) Low-Threat Underground Storage Tank Case Closure Policy[SWRCB,Leaking Underground Fuel Tank Guidance Manual, September 20121. Media-Specific Criteria:Petroleum Vapor Intrusion to Indoor Air Assuming non-aqueous phase liquids are not observed during depth-discrete groundwater sampling, vapor intrusion risk will be evaluated using Criteria 3 with the soil and groundwater sampling data collected during this phase of assessment. 8281 Commonwealth Ave. Buena Park,CA 90621 Phone(714)826-0352 24-hour(800)883-0352 Fax(714)523-7880