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0 <br /> AEI Project No. 305662 <br /> ' March 16, 2012 <br /> Page 3 of 3 <br /> ' suspect USTs identified or to ascertain whether any areas of former excavations indicative of a <br /> former UST hold are present. <br /> ' Drilling and Soil Sample Collection <br /> The scope of work proposed consists of the drilling and logging of a total of three (3) soil <br /> ' borings (SB1 through SB3) at the property (Figure 2). The selected drilling contractor will hold <br /> a California C57 driller's license. Soil borings will be advanced with a truck-mounted (or similar) <br /> direct-push drilling rig. <br /> The borings will be placed in and around the area denoted as "oil and gas" in historic Sanborn <br /> maps and based on the results of the geophysical survey. The locations of the borings may be <br /> altered based on utility survey findings particularly if underground utilities are identified within <br /> ' the drilling areas. <br /> • Boring SB1 will be advanced to 50 feet bgs or to groundwater, whichever is shallower, <br /> ' for the collection of soil and groundwater samples. It is anticipated that one (1) soil <br /> sample and one (1) groundwater sample will be analyzed from the boring. <br /> ' • Borings SB2 and SB3 will be advanced to a depth of approximately 20 feet bgs for the <br /> collection of soil samples. It is anticipated that one (1) soil sample will be analyzed from <br /> each boring. <br /> ' Soil in the shallow borings will be continuously collected in liners within the sampling barrel <br /> from which a 6-inch sample will be collected at appropriate depths. The sample will be sealed <br /> ' with Teflon tape and plastic end caps. The soil borings will be logged using the Unified Soil <br /> Classification System. A photo ionization detector (PID) will be used to screen soil samples in <br /> the field and the PID readings for each sample will be included on the boring logs. <br /> Groundwater Sample Collection <br /> When first groundwater is encountered, a slotted PVC casing may be temporarily inserted into <br /> ' the borehole to facilitate groundwater collection. Groundwater samples will be collected using <br /> either a disposable bailer or peristaltic pump and decanted into the appropriate sample <br /> containers. The containers will be sealed so that no head-space or air bubbles are visible within <br /> ' the containers. <br /> Boring Destruction <br /> Following completion of sample collection and removal of tooling, the borings will be backfilled <br /> with neat cement grout as required by the SJCEHD and completed at the surface with concrete <br /> ' to match the surrounding conditions. <br /> 1 <br /> 1 <br /> 1 <br />