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ARCADIS September 23, 2013 Phase II ESA UPS Freight Lathrop (CA) Before fieldwork began, a soil boring permit was received from the San Joaquin County Environmental Health Department(SJCEHD, Attachment 1). Health and Safety Plan The site-specific Health and Safety Plan (HSP)was prepared to include drilling activities in accordance with Occupational Safety and Health Administration requirements and applicable federal and state regulations(29CFR1910.120 and 8CCR5192, respectively)for use during site investigations. HSP procedures were reviewed with subcontractor and ARCADIS personnel prior to beginning fieldwork. Investigation Borings The borings were advanced using a direct push drilling rig. Each boring was continuously cored and lithology encountered at each boring was recorded using the Unified Soil Classification System (USCS)as directed by an ARCADIS professional geologist. A photoionization detector(PID)was used to screen the encountered soil for the presence of volatile organic compounds (VOCs). Each boring was advanced approximately 20-feet below ground surface to allow for groundwater sample collection. Copies of field soil boring logs are included as Attachment 2. Sample Collection and Analysis Due to the lack of PID detections and no visual observations that indicated the presence of petroleum hydrocarbon impacts, soil samples were only collected directly above the water table. After collection,the ends of the sleeves containing soil selected for laboratory analysis were covered with Teflon-lined plastic caps. The samples were then labeled, logged on chain-of-custody forms, and placed in an ice- chilled cooler for transportation to a California state-certified laboratory, under standard chain-of-custody protocols. Collected soil samples were placed on hold and were not analyzed. Grab groundwater samples were collected from each boring. The groundwater samples were collected by lowering a small-diameter(0.75-inch), stainless steel bailer down the drill casing from the surface and carefully decanting the sampled water into appropriate laboratory supplied containers. The samples were labeled, logged on chain-of-custody forms, and placed in an ice-chilled cooler for transportation to a California state-certified laboratory, under standard chain-of- custody protocols. Page: G WMM PSCWaN 1.01LOIOPW 11 EMll Sunny R.P N�_MPSP SalRf 3/5