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Stantec 76(Former BP)Service Station No. 11192 March 10, 2011 Page 6 • Health and Safety Plan (HASP). As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), Stantec will update the current site-specific HASP prior to the commencement of fieldwork. The HASP will be reviewed by the field staff and contractors before beginning field operations at the site. • Permitting. Permits for the advancement of the CPT borings will be obtained from SJCEHD prior to beginning work. An encroachment permit will be acquired from the City of Stockton Public Works Department for the advancement of borings in the public right-of-way. • Borehole Clearance Activities. Prior to initiating field activities, Stantec will mark the boring locations, contact Underground Service Alert (USA) at least 48 hours prior to the initiation of field work, and will contract a private utility locator to determine whether the proposed boring locations are clear of potential subsurface obstructions. After clearance is verified by USA and the utility locator, the borings will be air knifed to a depth of approximately five feet bgs to further minimize the risk of encountering utility lines that are not anticipated at each location. • Advancement of CPT Borings and Collection of Hydropunch° Groundwater Samples. Off-site CPT borings [CPT-4, CPT-5, and CPT-6 (and CPT-9 if it is determined it is needed)] will be advanced along Elmwood Ave to a maximum depth of 125 ft bgs (or refusal). Additionally, two on-site CPT borings (CPT-7 and CPT-8) will be advanced to a maximum depth of 140 ft bgs (or refusal). The borings will be advanced using a direct push CPT rig that will log soil lithology from approximately five feet bgs to the maximum explored depth. Groundwater samples will be collected from separate boreholes advanced adjacent to the CPT borings using a modified HydroPunch° sampler. Prior to sampling, a water level meter will be used to confirm that the drive rods do not contain water. The sampler will then be driven to approximately three feet below the desired sampling depth, and retracted three feet to expose the disposable schedule 20 polyvinyl chloride (PVC) screen and allow for groundwater to enter the HydroPunch°sampler. Each water sample will be collected by lowering a 3/4-inch diameter stainless steel bailer through the drive rods to groundwater. The groundwater will be bailed from the drive rods, decanted from the bailer into 40- milliliter (ml) volatile organic analysis (VOA) vials. Following the collection of each sample, the drive rods will be retracted, leaving the disposable drive tip and four-foot length of PVC well screen in the hole. Following completion, the CPT soil borings will be grouted through the drive rods from the total depth explored to surface grade with neat cement. • Groundwater Analysis. The soil samples will be submitted under chain-of- custody documentation to California-certified laboratory for analysis of TPHg, BTEX, fuel oxygenates (MTBE, DIPE, tertiary amyl methyl ether [TAME], ethyl tertiary butyl ether[EtBE], TBA and ethanol), and lead scavengers (1,2-DCA and ethylene dibromide [EDB]) by EPA Method 826013. 11192 CPT Investigation WP 3-2011.doc