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4 <br /> Working to Restore Nature <br /> Wells that did not contain floating product were purged using a 3 5-inch-diameter stainless- <br /> steel electric submersible pump The pump, cables, and hoses were cleaned with industrial <br /> soap and water before use to each well. The wells were purged until withdrawal is of <br /> sufficient duration to result in a stabilized pH, temperature, and electrical conductivity of <br /> ! the water measured using portable meters calibrated to a standard buffer and conductivity <br /> standard If the well was dewatered, the water level was allowed to recover to at least 80 <br /> ! percent of the initial water level <br /> Before collecting each groundwater sample, a Teflon bailer was cleaned with industrial soap <br /> I and rinsed with tap water and deionized water, and the sampler changes latex gloves The <br /> appropriate preservative (concentrated sulfuric, nitnc, or hydrochloric acid) was added to <br /> {� each sample bottle as required for the preservation of the sample before laboratory analysis. <br /> i A sample of the formation water was then collected from the surface of the water in each <br /> of the wells using the Teflon bailer The water samples were sealed in laboratory-cleaned, <br /> 40-milliliter glass vials with Teflon-lined lids so that no air bubbles are present The <br /> samples were then labeled and promptly placed in iced storage Chain of Custody Records <br /> were initiated by the field geologist and accompanied the samples to the analytical <br /> laboratories A field log of well evacuation procedures and parameter monitoring was <br /> maintained <br /> t' The fluids generated during sample purging were directed into type 17E, steel, 55-gallon, <br /> ! , liquid waste drums approved for this use by the Department of Transportation The drums <br /> were labeled and temporarily stored onsite pending disposal <br /> Sample Labeling and Handling <br /> f Sample containers were labeled in the field with the job number, sample location and depth, <br /> and date and promptly placed in iced storage for transport to the laboratory A Cham of <br /> Custody Record was initiated by the geologist and updated throughout handling of the <br /> samples and accompanies the samples to a laboratory certified by the State of California for <br /> the analyses requested. Samples were transported to the laboratory promptly to help ensure <br /> that recommended sample holding times were not exceeded Samples in our custody were <br /> properly disposed of after their useful life had expired <br /> M <br /> Gradient and Direction of Qroundwater Flow <br /> �i The elevations and horizontal references ("x" and "y" lateral coordinates) of the monitoring <br /> wells and other site features were surveyed by a licensed land surveyor with respect to a <br /> nearby United States Geodetic Survey, County, or City bench mark The horizontal <br /> distances were measured to the nearest 0 Hoot, and the elevations were referenced to <br /> within 0 01-foot. The groundwater elevation in each monitoring well was calculated by <br /> subtracting the depth to water from the wellhead elevation The groundwater elevation <br /> 30003-7 <br /> , <br />