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..-.,.--_. ,. ,. _. .L - .; `:. - .__'+- - —.._ c..._` - .. _. -y-- _ - : :. - - -. SS-. ... - - - ... a-. f •.r - - - .,..- - , e_ .. -.a;, 1 ' 10 December 1999 . ; . AGE-NC Project'No. 95-•0109 Page 3 of�6 '•pioperty. Historic Polk directories for Lodi,'at•five year intervals, were'reviewed to determine l,. pievious'occupants of nearby properties. People familiar with the historynear the subject property were also interviewed. ?. 3.0. FINDINGS Ground water elevation and,flowdirection were calculated'from,field data; hydrocarbon-impact to ground water was inferred from laboratory'analysis of the,ground water samples. . .3.1. GROUND WATER GRADIENT'AND DIRECTION The to depth ground water ranged from 50.78'feet bsg north of the site to 55.87 feet bsg south of the p l� g , . site during the September 1999 monitoring event. The data indicates an average.1.50-foot decrease'_ ofground water elevation between July and September 1999. Ground_ water elevation contours; based upon data collected,on 30 September-1999, are depicted in Figure 3, The inferred ground water flow direction is toward the south. A depression ofthe ground water surface again appears.to be located west of MW44,.whilea localized high is .located near MW=9. Ground water elevations'are summarized on Table 1. 3.2. MICROBIOLOGICAL,ACTIVITY,-IN GROUND WATER ' Concentrations of dissolved oxygen _variably -increased,and decreased between,'the-June and September.1999-monitoring events in water samples collected from. the wells. Only low general. microbiological•activity was detected in samples'from both MW-9 and-MW-14'during the September'. . 1999 sampling event. General subpopulations-decreased 'slightly whife selective-`subpopulations increased-. Field measurement'for indicators of microbiological activity are summarized on Table 2; microbiological and h sicocher6ical analytical results are summarized on Table'3.;The laboratory. ' €n p Y report(A. Keith Kaufman October 13, 1999) and chain-of-custody'fdrm.are included in Appendix' . 3.3,. PETROLEUM HYDROCARBON-IMPACTED GROUND WATER Petroleum hydrocarbons. were detected in ground water sarhples from five.'of the -seven .wells. ' ' sampled. TPH-g'concentrations ranged up to'4,800 parts per-billion {ppb; reported.as micrograms. . ' per liter). Benzene;.toluene, ethylbenzene and.xylenes were detected-at'concentration's as high as 9.9 'Advanced GeoEnvironmental;Inc."