more... > Organic & Water Labs > Water Quality Lab > Documentation Required For Sampling [Image: Chain of Custody Form] The Chain of Custody form is required to accompany regulatory samples from EPA- and LDEQ-funded projects. All other samples must be accompanied by a Sample Analysis Request Form. Please review the Water Sample Management and Collection Guide in the "Additional Information" link for necessary sampling and shipping guidance. If you have further questions, contact the Callegari Environmental Center Laboratory. Copper in Our Residential Water Systems: Corrosion and Blue Water [Image: Picture 1] Copper is a common, malleable metal that occurs in natural deposits as ores containing other elements, soil, water, sediment, and air. It is used to make products such as coins, electrical wiring, and water pipes for household plumbing