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June 2, 1992 <br /> 1� Beacon Station No. 492, Manteca, California <br /> The drill cuttings were stored on and covered with plastic sheeting at the site. Four soil <br /> samples were collected from the drill cuttings and composited into one sample in the <br /> �- laboratory for analyses. Results of analyses were used to evaluate disposal options of the <br /> drill cuttings, pending disposal by Ultramar. <br /> �. On February 21, 1992, a technician from RESNA developed well MW-4. Water purged <br /> from the well was temporarily stored onsite pending disposal by Ultramar. <br /> Results of Soil Analyses <br /> A soil sample collected from boring B-8 and the composite sample from the drill cuttings <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd) <br /> using Environmental Protection Agency (EPA) Method (modified) 8015, benzene, toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) using EPA Method 8020, and total lead <br /> using EPA Method 6010. In addition, the sample from the boring was also analyzed for <br /> ethylene dibromide (EDB)using EPA Method 8010. The samples were analyzed at Applied <br /> Analytical Environmental Laboratories in Fremont, California, and at Sequoia Analytical <br /> Laboratories in Redwood City, California. <br /> Results of laboratory analyses of the soil sample collected from boring B-8 and the <br /> composite sample from the drill cuttings indicated that TPHg, TPHd, BTEX, and EDB <br /> concentrations were below laboratory detection limits for the analytical methods used. Total <br /> lead was detected at a concentration of 6.6 parts per million in the sample collected from <br /> boring B-8 and is interpreted as representative of natural soil conditions. Concentrations <br /> of total lead were below laboratory detection limits for the analytical methods used in the <br /> W <br /> composite soil sample collected from the drill cuttings. Copies of the Chain of Custody <br /> Records and laboratory analysis reports are attached. <br /> GROUND-WATER MONITORING <br /> Field Methods <br /> Field procedures for ground-water monitoring and water sampling are presented below and <br /> discussed in more detail in our field methods (attached)_ A technician from RESNA was <br /> onsite on February 26, 1992, to take water-level measurements, perform subjective analyses <br /> of ground water, and,collect ground-water samples from wells MW-1 through MW-4. The <br /> technician did not note any subjective evidence of hydrocarbons in the samples (Table 2). <br /> 0316keu <br /> 86102-7 3 <br /> V <br />