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E �h # Flying J Travel P PRELE IINARY SITE INVESTIGATION Ripon, g laza NVE Ripon, CA f 4.0 INITIAL SITE ASSESSMENTf 1 At the request of San Joaquin County, OGI performed this Prehmi inary Site Investigation to r ' I evaluate the lateral and vertical extent of petroleum hydrocarbon impacts previoiusly identified beneath Dispenser 13/14 in the RV refueling area. 4.1 Drilling and Soil Sampling t Drilling was conducted February 4, 2009 using a B-57 llo stem auger drilling rig. The rig was used to advance 2 borings ad'acent to Dispenser r g J p /14 in the RV refueling area (Figure 2). Each boring was drilled to a depth of 25 feet bgs. During drilling, soil samples were collected at five foot intervals, or as lithologic conditions permitted, using a 2 1/2-inch diameter by 18-inch long split spoon sampler. The sampler was driven into the bottom of the°boring using a 140-pound hammer: After removal from the boring, soil was screened for evidence of petroleum impacts and.the split-spoon sampler was decontaminated before further use. Each sample„was checked''for discoloration and odor, screened with a,PID and { logged in accordance with the Unified Soil Classification System (Appendix A). After total depth was reachedin each boring, a water sample was collected from the open boring. The water samples were collected using disposable bailers- and then transferred to laboratory provided sample containers. Each container was sealed,labeled and then stored in a cooler until delivery to the laboratory. Soil samples were collected at five foot intervals and each sample was submitted to the laboratory for testing. The following samples were submitted: • Boring SB-1 at 5 feet bgs. ,I • Boring SB-1 at 10 feet bgs. • Boring SB-1 at 15 feet bgs. • Boring SB-1 at 20 feet bgs. �4 • Boring SB-2 at 5 feet bgs • Boring SB-2 at 10 feet bgs • Boring SB-2 at 15 feet bgs. � • Boring SB-2 at 20 feet bgs. ' i .} FLYING J INC. 6 OGI Project No. OGI-09-191 L'