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required for the private property parcel to the east of the site Since drilling was conducted in the City of Tracy right-of-way, an encroachment permit (#97-198) was obtained from the City of Tracy Department of Public Works Copies of all permits, access agreements and regulatory correspondence are included as Appendix B On December 16, 1997, Ramage Environmental notified Underground Service Alert (USA) to perform a routine utility clearance inspection (USA Ticket Nos 342200 and 342203) I 22 Push-Pont Soil and Groundwater Grab Sampling and Analysis On Friday, December 19 and Monday, December 22, 1997, Ramage Environmental collected soil and groundwater grab samples from eleven locations using a Geoprobes 5400 Direct-Push Technology (Geoprobe) rig, operated by Fisch Environmental of Valley Springs, California The push-point locations were positioned in and around the former UST excavation (Figure 2) The push-point borings SB-1 and SB-1A were located near the center of the former UST excavation To reduce any possibility of vertical smearing of contamination, SB-1 was drilled first to a total depth of 20 feet bgs so that a discrete soil sample could be collected without undue agitation of overlying impacted soil and groundwater A groundwater grab sample was also collected from SB-1 To collect additional, shallower soil samples from the former UST excavation, push-point boring SB-1A was advanced to a total depth of 15 feet bgs To evaluate the extent of impacted soil and determine the concentration of petroleum hydrocarbons in groundwater, four push-point borings (SB-3, SB-4, SB-5 and SB-6) were positioned 5 to 15 feet from the former UST excavation Push-point boring SB-5 was continuously cored using the MacroCoreO system To further define the extent of impacted soil and groundwater, six push-point borings (SB-2, SB-7, SB-8, SB-9, SB-10 and SB-11) were positioned 20 to 40 feet from the former UST excavation Each of these ten push-point borings f was advanced to a total depth of 15 feet bgs 2 2_1 _Soil Sampling Undisturbed soil samples were collected every five feet from each of the push-point borings Soil samples were collected by driving the Geoprobe sampler to the desired depth, retracting the piston tip into a sample tube lined with a one-inch diameter acetate sleeve and driving an additional two feet to displace the soil sample into the sleeve The soil samples were then extracted from the borehole to the surface using the Geoprobe rig The soil samples from SB-5 were extracted directly from the two-inch diameter continuous core The continuous core and each of the soil samples were logged for hydrogeologic and lithologic characteristics according 6