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GE$ <br /> GENESIS ENGINEERING & REDEVELOPMENT <br /> The analytical procedures, sample volumes, sample preservation, and holding times are <br /> presented in the Sampling and Analysis Plan. <br /> T he groundwater monitoring wells may be sampled quarterly for a period of one year if <br /> constituent concentrations require additional monitoring. <br /> 2.4 Task 4—Surface Water Investigation <br /> Surface water samples will be collected during or immediately following a rainfall event. <br /> The point(s) of sample collection will be benchmarked for future sampling events. <br /> Samples will be collected in accordance with the procedures presented in the Sampling <br /> and Analysis Plan. The surface water samples will be analyzed for the following <br /> constituents: <br /> 1. Volatile Organic Compounds ("VOC"); <br /> 2. Semi-Volatile Organic Compounds (SVOC"); <br /> 3. Total Petroleum Hydrocarbons as gasoline("TPHg"); <br /> 4. Total Petroleum Hydrocarbons as diesel ("TPHd"); <br /> 5. Benzene, Toluene, Ethylbenzene, and Xylene (`BTEX"); <br /> 6. Polycyclic Aromatic Hydrocarbons ("PAH"); <br /> 7. Oil & Grease; <br /> 8. Title 22 Metals and Hexavalent Chromium; and <br /> 9. Alkalinity, Calcium, Chloride,pH, Sodium, Potassium, Sulfate, Sulfide, Total <br /> Dissolved Solids, Total Hardness, and Conductivity. <br /> The analytical procedures, sample volumes, sample preservation, and holding times are <br /> presented in the Sampling and Analysis Plan. <br /> 2.5 Task 5—Tidal Influence Study <br /> Groundwater flow at the Site may be influenced by tidal fluctuations; as well as diversion <br /> and irrigation pumping and seasonal rainfall. If tidal influence is present, the perspective <br /> of up-gradient, down-gradient, and"regional background"will need to be reevaluated <br /> with respect to groundwater impacts coming onto or leaving the Site and with respect <br /> what constitutes up-gradient and regional background sampling. The purpose of the <br /> Tidal Influence Study will be to evaluate whether groundwater elevation and <br /> groundwater flow direction change based on tidal influence. <br /> The impacts of tidal variations on groundwater flow will be evaluated using continuous <br /> water level indicating data loggers placed in 4 of the new monitoring wells and a stilling <br /> Site Investigation Work Plan 13 of 18 <br /> DePaoli Property <br /> November 14,2007 <br />