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want yce atnmp. 6aVnrwn contaminated primarily with soluble organic pounds (yoCi). The FRemedial nvezdgptbn/fepsbgi[y Study at DDHW-5hameSle Record of Eastman (HOD), Dpemble Unit (DO S n 993) de oundwateresta t ction, treatment, ch, and ,disarge of treated effluent as the selected remetly contaminated undwdter. The rm&pb n ISi9nifzmm Oiffemn s (ESE) to the OU 1 ROD (URS, 2014a) war signed and approved bythe regulatory agende coal [he Army in 4. The ESE adds in z treatment of high levels d subsurface and Ian use tronr(LUa). OU-2 addresses soil soil gas above the w table. The - (ESE 996) documents a and treatment z of V and also documents no further action doctrine at multiple sites. TheomolAmendment lathe 0U 2 HOD UIH 11) modified the nofurtnera protectiveness by adding TUCs at ten sites and nological m sites for thebur owl (Amece icmnrak a Calif«sipackes of g The MW505 well cluster, also known as SHAO-0UI and UOg, a located outsidespecialmiss the installation boundary to the northwest of the Nourth gallon a (Figure and 2). and -We are located in the areas where Flumes T and a were identified in the EU 1 Them plumes are commonly referred to as North galloon plume. A xalry si6oncant, Increasing ds rend at t was reported in the 201 2015 port (Du, 01 ) anwarramfuehercharactemaion.1.2.1Geologyandity lroge rlogy In the Sharpe mere Is lumber system four hydro athimpmc ere es nave rfed Inxthe hyE 6eolne and zm0 fed IN) below groundce pay).These nydranatlgaphic system distinct zones to monitor hydra gradients and co mcudeseveml saturated ttrransmissi ay (sands) '5 to 12 feet thick in the Imposing depth Intervals: • A Zone—water table to 40 fret logs !re[ ists • C Zone— DO to170 feet logs • E Zone— 170 to 270 feet logs n the A Zone, groundwater is generally uncenfined; however, the fine-grained deposits In the lower A Zone and upper B zone (also known as the A/B ayunard) Iwaily create confining conditions. Although mere Is good mntinugy of the confining layer across Sharpe, groundwater and dissohn d contaminants can move from the A e through the Zone and into met Zone because the colmmng layer In same areas and contains mbave been cal hydraulic gradients used by pumping of ondepo and off-depotwater supply wells. The B, C and D Zones have nydaulic cAaraaemnm of leaky confined a pink.. Subsurface solls vary from clay and i and Within each of the z es,depositsiz ss of the soil types can be found; however the deposits Wary In thickness vertically and horizorally across Sharpe. SIR and clay are the dominant soil types beneath Sharpe, and those deposits are Interbedded with sands. The depositthat apparently has sofa Mof day and sift silty sarnls In th lowers,ze and the Upper B Zone (approximately3t0 feet bgs to To feet hics. This fine- grained it (also known as the " summit) slovrs the horizontal and vertical migration grat of groundwater and communities n Sands are generally thicker and mare abundant In the C and D Zones. Because the transmisawities of the sands in those zones allow groundwater to move at a nigher velocity, Mass Emmonmentat mc. 2