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r..r N%0011 <br /> 2.1.2 Permits <br /> To perform the proposed scope of work, a drilling permit will be obtained from PHS/EHD. In <br /> addition, since the drilling of SB-7 is proposed to be located in the city of Stockton sidewalk, an <br /> encroachment permit will be obtained. At least 48 hours prior to drilling, Underground Service <br /> Alert (USA) will be notified to perform a routine utility clearance inspection. <br /> 2.2 Push-Point Soil and Groundwater Grab Sampling and Analysis <br /> To define the vertical extent of impacted soil and to determine if groundwater has been impacted <br /> by petroleum hydrocarbons, soil and groundwater grab samples will be collected for analysis <br /> �. from two (2) locations (Figure 2) using a Geoprobe® 5400 Direct-Push Technology (Geoprobe) <br /> drilling rig. <br /> The proposed push-point locations are positioned at the known sources of petroleum <br /> hydrocarbons. The first push-point boring (SB-6) will be located at the southwest corner of the <br /> former UST excavation pit where Kleinfelder identified impacted soil in their soil boring B-5 to a <br /> maximum drilling depth of 25.5 feet bgs. The second push-point boring (SB-7) will be positioned <br /> at the remote fill where soil sampling during the UST removal identified petroleum hydrocarbons <br /> at a depth of 1.5 to 2.0 feet bgs. The proposed sampling and analysis plan for both of the <br /> sample locations is summarized in Table 1. <br /> w <br /> 2.2.1 Soil Sampling <br /> Undisturbed soil samples will be collected from each sample location at five-foot intervals until <br /> groundwater is encountered. In SB-6 (southwest corner of UST excavation pit), soil samples will <br /> be collected at five-foot intervals beginning at a depth of 20 feet bgs. In SB-7 (remote fill <br /> location), soil samples will be collected at five-foot intervals beginning at a depth of 5 feet bgs. <br /> Soil samples will be collected by driving the Geoprobe sampler to the desired depth, retracting <br /> the piston tip into a sample tube lined with a one-inch diameter acetate sleeve and driving an <br /> additional two feet to displace the soil sample into the sleeve. The soil sample will then be <br /> extracted from the borehole to the surface using the Geoprobe rig. A field geologist will log all <br /> soil samples for hydrogeologic and lithologic characteristics according to the Unified Soil <br /> Classification System and screen each sample for any hydrocarbon vapors using an organic <br /> vapor monitor equipped with a photoionization detector. <br /> 4 <br /> V <br /> i� <br />