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The Newark Basin (NB) is a Mesozoic aged half graben that filled upward with nonmarine: (1) fluvial deltaic Stockton Formation, (2) deep lake LF, and (3) shallow lake playa – PF, now comprising the 3 major aquifers. Only the LF and PF aquifer matrix are enriched in arsenic and have natural aqueous arsenic issues. These formations strike ~ NE and dip ~ 12 degrees NW and the LF and PF are bedding confined, multi-layered, leaky aquifer systems. Much work to evaluate the sources and mobilization mechanisms of arsenic in the LF and PF aquifers has been conducted (Serfes, 2005; Zhu and others 2008; Serfes and others, 2010). Recent concerns about the significance of As mobilization from non-imported backfill to be used in a linear trench excavation transecting the LF and PF have been evaluated. Column leach testing of LF and PF rock particles used EPA Method 1627 (USEPA, 2011; Serfes, 2016). These test results not only provided information addressing the key concern(s), but also indirectly about what the major zones of As mobilization in these aquifers are. The EPA-1627 methodology and an improved biogeochemical model of As mobilization in the NB follows.

abstracts with programs - geological society of america

ARSENIC MOBILIZATION AND TRANSPORT IN HYDROGEOCHEMICALLY DYNAMIC RECHARGE ZONES VERSUS STEADY-STATE DEEP WATER-BEARING CONDUITS IN THE LOCKATONG AND PASSAIC FORMATION AQUIFERS IN THE NEWARK BASIN, NEW JERSEY