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GeoStrategies Inc. <br />} <br /> A., Unocal Corporation <br /> July 10 1992--1 <br /> Page 2 <br /> Ground-Water samples were collected on May'- 8, 1992-. Samples were analyzed <br /> for Total Petroleum .:,Hydrocarbons calculated as Gasoline (TPH-Gasoline), <br /> according to. EEPA Method; 5030; for Benzene; Toluene, Xylenes <br /> (BTEX) according to EPA Method 8020, and for Total Petroleum Hydrocarbons. <br /> calculated as Dieser (TPH-Diesel) according to EPA method .35-10.. The ground- <br /> water samples were: analyzed-:by National Environmental Testing :(NET) Pacific, <br /> a. California `State-certified'. laboratory located. in Santa Rosa, California. The <br /> laboratory, analytical, report and Chain-of-Custody form;are included in _Appendix <br /> A. These data -are summarized-, and, included.� with. the `historical chemical <br /> analytical data -presented in Table 2. _A chemical concentration map for benzene <br /> is presented on Plate 4 Groundwater- sampling field methods and procedures .are <br /> included;.-in Appendix B. <br /> If you. have any questions, _please: call. <br /> GeoStrateges=.Inc. by,.:. <br /> Ellen C. Tostersmith <br /> Geologist:.. <br /> - <br /> ,�C,QF0 .%,: LUiyp`Fy, <br /> Diane.M. Lundquist; P:E: .c <br /> Senior Engineer: N0: <br /> C 46725 C46725CIVVL <br /> '' <br /> - - - ECF/DML/shl `' ` - ...::. � �TgT6.p�CA <br /> a Plate 1. Vicinity' M <br /> Plate 2: . -_-Site Plan <br /> Plate 3... . :Potentioitietrc N14p'. <br /> Plats 4. Benzene. Concentration Map.- <br /> Appendix .A: Laboratory Analytical'Report and:Chain-of-Custody Form <br /> Appendix B: Field: Methods :and Procedures <br /> QC Review: <br /> 78460'14 . <br />