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t Taber Sime 1954 AMENDED SCOPE OF WORK Based on discussion at the April 7, 2009 meeting, Taber proposes the following revised scope of work: 1. Taber will advance a soil boring (B-5), at the location shown on Figure 3, to groundwater using a limited access rig (LAR) employing hollow-stem auger techniques to further define the lateral extent of impacted soil north cf the spill area at the site and to collect a grab groundwater sample in the presumed do ngradient direction from the underground storage tank location. The soil boring is expected to be advanced to a total depth of 70 feet below grade, with groundwater expected tc be encountered between 50 and 60 feet below grade. 2. During advancement of the proposed soil boring, undisturbed soil samples will be collected from acetate sleeves or brass tubes. A field geologist will log each of the undisturbed soil samples for hydrogeologic and lithologic characteristics according to the Unified Soil Classification System (USCS) and screen each sample for organic vapors using a photoionization detector (PID). The pr posed boring will be continuously logged to the extent site conditions permit. 3. Based on field observations and PID measure ents, up to two sol samples will be-,' - collected d,'collected from proposed boringto be submitted for laboratory analysis. The soil samples will be sealed with Teflon®sheets and plastic end caps, labeled, placed in Ziploe sealable bags, packaged in an iced cooler, and transported with chain-of-custody documentation to a state of California-certified hazardous waste testing laboratory for analysis. Each of the soil samples will be analyzed on a standard turn-around time for TPH-D and TPH-G by EPA Method 8015M and for volatile organic compounds, including BTEX and PCE, by EPA Method 8260B. 4. A grab groundwater sample will be collected at he total depth of the soil boring using a disposable bailer or bladder pump. The grounc water sample will be placed in clean glass sample containers, sealed, packaged in n iced cooler, and transported with chain-of-custody documentation to a state of C lifornia-certified hazardous waste testing laboratory for analysis. The groundwater camp a will be analyzed on a standard turn- around time for TPH-D and TPH-G by EPA Method 8015M and for volatile organic compounds, including BTEX and PCE, by EPA Method 8260B. All work will be performed in accordance with County r gulations, California Code of Regulations, Title 23, Section 2647 and 2648, and the California Department of Water Resources Bulletins 74-81 and 74-90. Drilling activities will be overseen by a State of California-registered Professional Geologist. Schedule Permitting for the proposed soil boring has already been completed. The subsurface investigation is expected to be completed as soon as practical upon approval of this work plan addendum. Should groundwater concentrations in the collected groundwater sample be below water quality goals, Taber will prepare a No Further Action Required report which will document site investigation results and address site closure para eters in accordance with San Joaquin County Environmental Health Department guidelines aid Appendix A - Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites.,