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3164 Cold Camp Ofive <br /> Suite 200 <br /> Delta Mancho Cordova,-CA 95670 <br /> . Environmental gT61638-2085 <br /> Consultants,Inc. FAX 9161638-8385 <br /> June 26, 1997 <br /> Mr Kenneth Earnest <br /> Ultramar,Inc <br /> 525 West Thud Street <br /> W Hanford,California 93230 <br /> Subject Addendum to Appendix B/Risk Based Corrective Action Tier 1 and Tier 2 Analysis, <br /> Site Closure Evaluation Report <br /> Former Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi,California <br /> Delta Project No D093-915 <br /> k <br /> Dear Mr Earnest <br /> This document presents the mass balance calculations of total petroleum hydrocarbons (TPH) as diesel <br /> ui soil before and after remediation The calculations were requested by San Joaquin County Public <br /> Health Services, Environmental Health Division in a letter dated April 21, 1997 Figures 1 and 2 <br /> illustrate the site location map and the site map,respectively <br /> Mass Balance Calc]QUous for Soal-1994 <br /> Analytical data from soil borings performed in 1994 indicate that TPH as diesel was encountered from <br /> 4 to 70 feet below surface grade (bsg) at the site Table I summarizes the 1994 TPH as diesellsoil <br /> analytical data. In an effort to assess the vertical and lateral extent of TPH aS diad kvsa4�sfie <br /> subsurface was sub-divided into eight 9-foot thick layers as shown in Figures 3 -4 t�Baod OnUe <br /> inferred distribution of TPH as diesel, it has been calculated that approxim4ely A2,790*Ions 4TP,,i <br /> as diesel were present in the soil underlying the site prior to completion of SA remedtaifoftimd tik <br /> excavation activities in 1994 The mass balance calculations are included flf,'AOJ�ndix A. <br /> Mass Balance Calculations for-Soif-1996 <br /> r <br /> Following the completion of SVE remediation and milli eXcavatiott activities hi 19M AWd'soil <br /> borings were performed to assess the pMW*tii t+ # iiiil petrollrtl `��Cz�s mil at 'site." <br /> Based on the analytical data, TPH as diesel ^fits Wcountered from 41 tb 60, bsg, -Uble 4 <br /> summarizes the 1996 TPH as diesel soil anaiytidd data. Figures 5'end 6 piesdM t6 sampk moons <br /> and the vertical and lateral extent of TPH as diesel remamiq in soil. Fused on thesd fq9M and tha <br /> analytical data, it has been estimated that,4,456 gallons bf T#H as diesel is reMwnft ul t1W Wil <br /> underlying the site following SVS remediation ani t&*'15ke6ktion activiOddlMillkitftifIvIffil 1996. It <br /> appears that the most highly elevated levels of TPH as gasoline and TPH as dies d ie in mss permeably <br /> Provtding a Competitive Edge <br />