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` Phase Ii Subsurface Investigation • • <br /> Tracy Corners Shopping Center <br /> 3225 North Tracy Boulevard <br /> Tracy,California 95376 <br /> Partner Project Number P14-129814.2 <br /> December 19,2014 <br /> Page 13 <br /> Groundwater was not encountered during this investigation and was not a part of the scope of work. <br /> According to the State Water Resources Control Board (SWRCB)GeoTracker Website (Global Identification <br /> Number T06077000), a leaking underground storage tank site is located approximately 400 feet north of <br /> the subject property. The water table at this location was at a depth of approximately 9 to 13 feet below <br /> ground surface (bgs) during 2005 with a flow direction to the south-southwest. Given the recent and <br /> ongoing drought it is likely that the water table is at least several feet deeper than it was in 2005. <br /> Subsurface Investigation Scope of Work <br /> Please see Table 1 for a summary of the borings, sampling schedule and laboratory analyses for this <br /> investigation. The scope of the Phase II Subsurface Investigation included the advancement of four <br /> borings(SG1 through SG4)for the collection of representative sub-slab soil gas samples. <br /> Field Activities <br /> Utility Clearance <br /> Partner delineated the work area with white spray paint and notified Underground Services Alert (USA) <br /> North to clear public utility lines as required by law at least 48 hours prior to drilling activities. USA North . <br /> issued ticket number 509978 for the project. <br /> Health and Safety Plan <br /> Partner reviewed the site-specific Health and Safety Plan with on-site personnel involved in the project <br /> prior to the commencement of drilling activities. <br /> Drilling Equipment <br /> On December 9, 2014, Partner advanced borings SG1 through SG4 with a rotary hammer drill. Sampling <br /> equipment was decontaminated between samples and borings to prevent cross-contamination. <br /> Boring Locations <br /> Borings SGl was advanced in the boiler room of the dry cleaning facility adjacent to a floor drain. Boring <br /> SG2 was advanced southwest of the dry cleaning machine, SG3 south of the dry cleaning machine, and <br /> SG4 northeast of the dry cleaning machine. Please see Figure 3 for a map indicating boring locations. <br /> Sampling Depths <br /> Borings SGl through SG4 were advanced to a terminal depth immediately below the concrete slab floor <br /> of the interior area of the dry cleaning facility. Soil gas samples were collected from each boring <br /> immediately below the slab at 5 inches bgs. <br /> Sub-Slab Soil Gas Probe Construction <br /> Each sub-slab soil gas probe, consisting of a pre-fabricated stainless steel screen attached to 1/a-inch <br /> diameter polyethylene tubing which was manually inserted into a 1h-inch diameter hole drilled within the <br /> concrete building slab using the rotary hammer drill. Sand was poured into the annulus to form a sand <br /> pack around the probe screen and approximately 2 inches of dry, granular bentonite was placed atop the <br /> PARTNER <br />