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9 March 2020 Page 2 Pre-field Activities The following pre-field activities will be completed prior to performing the fieldwork associated with the additional limited Phase II investigation: • Preparing a Site-Specific Health and Safety Plan (HASP)outlining the procedures to be followed during the field sampling activities. • Notifying Underground Service Alert (USA) and obtaining a USA Ticket Number for the field sampling activities. • Procuring field and sampling equipment along with sampling containers and coordinating with the laboratory. • Obtaining a soil boring permit from the SJCEHD. Soil Sampling Haley&Aldrich will collect shallow soil samples from within the footprint of the former structure that was located on the northwestern edge of the Site, adjacent to Corral Hollow Road. To perform this sampling, Haley&Aldrich will conduct the following activities: • A private utility locator will be used to scan for underground utilities in the vicinity of the proposed boring locations. • Four shallow soil borings will be advanced within the former structure footprint on the northwestern edge of the Site to a total depth of approximately 8 feet below ground surface (bgs) using a hand auger to clear the first 5 feet bgs.A direct-push technology drill rig will then be used to complete the boring(Figure 1). • Soils will be visually observed and screened with a field instrument.Soil characteristics will be logged using the Unified Soil Classification System.All field activities and observations will be recorded in a daily log. • Two discrete soil samples will be collected from each boring(eight total samples)at depths based on visual or olfactory observations of potential soil impacts. If no potential soil impacts are observed,soil samples will be collected at depths of approximately 1 and 3.5 feet bgs. • At each target sample depth,soil samples will be collected directly from the bottom of the hand auger bucket, immediately after extraction from the boring, using a TerraCore"sampler(USEPA Preparatory Method 5035)to prevent loss of volatile compounds.The TerraCore'""sampling kit utilizes field preservation of the soil to obtain samples that accurately represent in-situ concentrations of volatile compounds.A laboratory-provided glass jar with a Teflon®-lined lid will be filled with remaining soil from the sample interval for analysis of non-volatile compounds.All reusable sampling equipment such as the hand auger will be decontaminated with detergent between sample intervals • Soil samples will be submitted following standard environmental handling methods and under chain-of-custody documentation to a California-certified analytical laboratory forthe following: — California Title 22 metals(CA T22 metals) using United Stated Environmental Protection Agency(USEPA) Method 6010/7471; — Volatile organic compounds(VOCs)and gasoline range petroleum hydrocarbons(TPHg) using USEPA Method 8260;