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• r Privileged and Confidential, Attorney Work Product October 13,2017 Scope of Work for 455 E.Eleventh Street Tracy CA 95376 6010/6020,total petroleum hydrocarbons as motor oil(TPH-mo)and TPH as diesel(TPH-d) using method 80158.The five shallow soil samples will also be analyzed for organochlorine pesticides using EPA method 8081,and polychlorinated biphenyls(PCBs) using EPA Method 8082. Task 1.2 Soil-Gas Sampling Soil-gas samples will be collected from each location at two depths, approximately 3 and 10 feet bgs. Each soil-gas sample will be collected from an individual boring.The boring will be drilled by a licensed drilling subcontractor using a hand auger, duel-tube, direct push(or equivalent) drilling method.The soil-gas samples will be collected following Department of Toxic Substances Control(DISC)approved methods'. The soil-gas sample will be collected in laboratory-provided SUMMA canisters and will be transferred under strict chain-of-custody procedures to a California-certified analytical laboratory.The samples will be analyzed forvolatile organic compounds (VOCs) using EPA Method TO-15 and TPH-g using method 8260B and Helium using ASTM Method D1946-90. Task 1.3 Groundwater Sampling One additional soil boring will be advanced at the proposed grab groundwater sample location shown on Figure 2. The boring will be advanced to the depth of groundwater(estimated to be approximately 10 feet bgs),or a maximum of 20 feet bgs. If groundwater is encountered, a grab groundwater sample will be collected from the inside of the boring, using a clean disposable bailer or disposable tubing and either a peristaltic pump or check valve pump.A temporary PVC well screen may also be installed if necessary to allow removal of the duel tube rods, in which case the sample will be collected from inside the temporary casing. The groundwater sample will be analyzed for TPH-g using EPA Method 8260B and for VOCs using EPA method 8260. Closing We are grateful for the opportunity to offer our services on this important project. If you have any questions or comment regarding this proposal, please contact Andy Lojo at(510) 645 1850 ext. 77 or Laurie Israel at(916) 594-8499 ext.39. Sincerely, Andrew M. Lojo, P.G. Laurie B. Israel Principal Geologist Associate Scientist Attachments Figure 1—Proposed Sample Locations 'California Environmental Protection Agency(Cal/EPA).2015.Advisory:Active Soil Gas Investigations.July. Page 3 of 3 Terraphase Engineering Inc.