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1117 Lone Palm Ave,Suite 201 <br /> Modesto,CA 95351 <br /> (YV <br /> Phone:209-579-2221 J%TC <br /> r Fax: 209-579-2225 <br /> 2.4 Mass Calculations for Site Specific Compounds <br /> Contaminant mass calculations (refer to ATC's Site Conceptual Model, Eggiman Property, 1112 <br /> �.. East Harding Way, Stockton, California, dated March 6, 2008, for the detailed mass <br /> calculations) have been completed for TPHd, TPHg, and BTEX in soil and TPHd, TPHg, BTEX, <br /> MTBE and 1,2 DCA in groundwater. A summary of the quantified mass values, as reported <br /> from March 2008 data, are presented in the following table: <br /> Mass in Volume of <br /> Groundwater I Groundwater LMass in Soil Volume of Soil <br /> Pounds Cubic Feet Pounds Cubic feet <br /> TPHg 15.16 11,444,932 _15,1_31.73 1108,251 <br /> TPHd ; 4.29 3,74_2,1_8_5236.01 2,007 <br /> Benzene 0.01 132,216 0.54 2,361 <br /> Toluene 0.01 94,440 43.59 71,184 <br /> Ethylbenzene 0.12 y 358,872_ 21.69 _ ; 71,184 <br /> Total Xylenes 10.24 481,644 _ 99.59 _1 71,184 <br /> MTBE 0.44 661,080 Not applicable Nota licable <br /> .r 1,2 DCA 0.51 1,614,924 <br /> Not applicable Not applicable <br /> Total Mass in 5,131.73 <br /> TPHg 5.16 -- -- <br /> 3.0 REMEDIAL OBJECTIVES <br /> �1 <br /> According to CCR Title 23, Chapter 16, Article 11, at least two alternatives must be identified <br /> and evaluated for protecting or restoring beneficial groundwater uses. In addition, each <br /> �•+ alternative must be designed to mitigate nuisance conditions and risk of fire and/or explosion. <br /> Groundwater quality monitoring and data collection are currently part of the existing program <br /> and will continue to be a key aspect of any remedial alternative selected. Continued monitoring <br /> would be used as a tool to manage the dissolved contaminant plume as a means to assess the risk <br /> of exposure or further subsurface impact. Vadose zone constituent of concern(COC) evaluation <br /> using soil sample collection and analysis may be implemented to evaluate the adsorbed-phase <br /> contaminant reduction and mass flux. <br /> The proposed remedial action objectives are intended to protect beneficial uses of groundwater <br /> and human health. <br /> Soil <br /> Using established technology to the extent logistically and economically feasible, the specific <br /> remedial objectives for impacted soil beneath the site are to reduce petroleum hydrocarbon and <br /> s:\environmental\22493\reports\feasibility.doc 6 <br /> r <br /> r <br />