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21'October 1996 <br /> r, :AGE-N C-95-0109 <br /> Page,5'of 6.. ' <br /> '3:5 HYDROCARBON'MASS BALANCE;CALCULATION.IN SOIL <br /> 15 sections. The mass of hy;dracarbons in 4 <br /> The,site+was divided into,4 layers cvnsiSting'of.a tatal;of <br /> each sectiori:was then`estamated._A total,of 5,48 T`pound's,or 877, gallons of gasoline"was estimated' ' } <br /> .,• <br /> to remain in soil at the site: The greatest mass'Ofhydrocarboris was calculated t an outlin apf mass <br /> at depths from 30 'to 55''feet bsg., P1ots.sliowing:"areas cif impacted soil-and ; <br /> endix E: <br /> Calculations are included in App, <br /> 4 0 r CONCLUSIONS AND RECOMMENDATIONS <br /> ;HYDROCARBON-IMPACTED SOIL . <br /> � r . <br /> Soil sam les were not collected during-the quarter of,199 - Analysis soil samples roclar>!on ' i' ; <br /> p <br /> "between September:1994: and;•March:1996 has <br /> indicated an overall ti decrease o ercent,•Tlie <br /> concentrations"at the'site;,1ocally.,eonceritratioiis have decreased ort of V W 5 pths.between <br /> greatest mass of hy'drocaxbon compounds remaining iri soil occurs n. <br /> d SS feet'bs . The area north of Vw-1 also contains higher concentrations of hydrobcle bons at" <br /> 30 an, g7. <br /> depths frorri Z0 to-25 feet bsg Analytical results of soil saniples;are�sum arized on <br /> We recommend the `addition,of nutrients to these` target areas_as detailed in' Work plan.for'. <br /> 1l7odi cations to Biorerriediation'Of Soil and Ground Water. dated 13 D'ecember.1995 i <br /> WATER ` <br /> HYDROCAR:BON-IMPACT;ED GROUND , <br /> Ground water elevafioia has dropped more than`3 feet between June and September 199b {see Table <br /> 4 The. round-��rater flow,direction"continues to be southerly Analytical results fr hasMo .'a d <br /> g ydrocarbon' lume g <br /> 10,MW-l'I;=MW 12 and MW 13 continue'to�nclicate.that the h was cletec ed in IvIVJ-7; '' r <br /> beyondtYie known plume boundaries. Only a•low concentration'of TPfi�g ^ <br /> �.' Y <br /> indicating that this-well remains the edge of the hydrocarbon plume.. <br /> H drocarbon concentrations have reznained'high in MW 9. Concentrations have`'fluctuated rn"MW „ <br /> Y <br /> 14;aliut have remained zelatively stable over the last`•three' quarters..:Ano aotssceiitered near <br /> samples has,again indicated'that the contaminant plume,has'split,into two P <br /> `t ; MW 14 and 1v1VJ-9. r <br /> n trattons�of dissolved oxygen have getierally increased at the site iiiuing the tliird,quarter of+ <br /> Ca cen <br /> 1996'. Results.of.microbiological and h sicochern cal analysis performed by, an independent' <br /> P Y <br /> coni§ultant indicate,a slight overall increase in bio de gradational.activity°toward the beginning of the <br />