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I S <br /> I <br /> r <br /> 17� December 1999, I e 1 1 <br /> 1 AGE-NC Project No 96-0235 - <br /> Page 5 of 11 r_ ; <br /> I le f N n <br /> F <br /> i I 1 I 11 r <br /> 28 SURVEYING <br /> On 03 December 1999, the casing elevations of wells MW-9, and MW-10 were surveyed to the <br /> nearest 0 01400t'relative to MW-6A by representatives of AGE The remaining wells at the site, <br /> including MW-6A,were previously surveyed by Baumbach & Piazza, Inc relative to mean sea level <br /> as established`,at a Clty,of Stockton Bench Mark (Table 4) <br /> 2'9 PURGE/DECON WATER DISPOSAL <br /> On 08 October and 11 November 1999; water generated during purging of monitoring wells and <br /> decontamination of augers from drilling was disposed Approximately 1,320 gallons of water were t <br /> transported 'under hazardous waste manifest by Nor Cal Oil of Denair, California Water was <br /> transported to AmeriClean, Inc in Silver Springs,Nevada for disposal Manifests are Included in <br /> Appendix-E <br /> I <br /> i i 1 <br /> ry2 10 PREPARATION OF CROSS SECTIONS <br /> Two cross sections were prepared for the site illustrating the shallow subsurface geology and <br /> hydrocarbons concentrations in soil beneath the site The cross sections are included as Figures 5 and <br /> 6 A map was also prepared to Illustrate the lateral extent of impacted soil beneath the site <br /> t 2 11' MASS BALANCE CALCULATIONS <br /> } <br /> s <br /> Figures 4 through 6 were used to estimate the mass of contaminants at the site due to operation of k <br /> the former UST No 3 The volurne of impacted soil was subdivided as illustrated in Figure 7 and <br /> the lateral area and average thickness of each section was estimated An average concentration of <br />' hydrocarbons'(TPH=g and+TPH-d) was estimated from soil samples collected and the,mass of <br /> contaminant was calculated Mass calculations, conversion factors and assumptions are included in <br /> Appendix F - <br /> y <br /> I <br /> 1 } y <br /> S <br /> ! I <br /> 3.0. ,FINDINGS <br /> The approximate lateral and vertical extent of remaining hydrocarbons in soil was estimated and _ <br /> cross sections were prepared The approximate mass of hydrocarbons in sail was estimated,from the <br /> cross sections Ground water elevation and flow direction were 'calculated from field data, <br /> hydrocarbon-impact to ground water was inferred from laboratory analysis of the ground water i <br /> I <br /> 1 ' <br /> k �I <br /> Advanced GeoEnviron mental,Inc <br /> 3 r 1 t <br />