Laserfiche WebLink
APPENDIX B <br /> GROUNDWATER SAMPLING AND ANALYSIS PROCEDURES <br /> Groundwater Sampling <br /> The static water level in each well was measured to the nearest 0 01 foot with a Sohnst electric <br />' water level indicator cleaned with a laboratory-grade, non-phosphatic detergent and deionized water <br /> before use in each well A clean bailer was used to obtain a sample from the surface of the water in <br /> the well for a subjective analysis of hydrocarbons The sample was retrieved and visually examined <br /> for floating product, sheen, color, and clarity <br /> Approximately three casing volumes of groundwater were purged from the wells using a <br /> stainless-steel, electrical, submersible pump or disposable bailer The pump,cables, and hoses were <br /> cleaned with a laboratory-grade, non-phosphatic detergent and water before use in each well The <br /> wells were purged until withdrawal was of sufficient duration to result in stabilized pH, temperature, <br /> and electrical conductivity of the water, as measured by portable meters calibrated to a standard <br /> buffer and conductivity standard <br /> A sample of the formation water was then collected from the surface of the water in each of the <br /> wells with the Teflon bailer and slowly transferred to laboratory-cleaned sample containers <br /> Sample Labeling and Handling <br /> Water samples were preserved in laboratory-cleaned, 40-milliliter glass vials that contained <br /> concentrated hydrochloric acid as a preservative as necessary The water samples were sealed with <br />' Teflon-lined lids to eliminate air bubbles The sample containers were labeled in the field with the <br /> site identification, monitoring well number and depth, and date, and promptly placed in iced storage <br />' for transport to the laboratory The technician initiated chain-of-custody records in the field that <br /> accompanied the samples to a laboratory certified by the state of California for the analyses <br /> requested Samples were transported to the laboratory promptly <br /> N IsacDPLw044Pg188018800391A 4aa doc Shaw Environmental,Inc <br /> (09 050000) <br /> 8-1 <br />