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Nt <br /> k A Wright <br /> Environmental <br /> Services, Inc. <br /> May 21, 2001 Construction ♦ Engineering • Remediation <br /> Project No 4100 <br /> M&M Automotive <br /> 60 E 10th Street <br /> Tracy, CA 95376 <br /> Attention Mr Larry McLean <br /> Re: Addendum Letter for Site Closure Report <br /> 60 E. 10th Street, Tracy, CA <br /> Dear Mr McLean, <br /> Wright Environmental Services has prepared this addendum letter for the above referenced <br /> Site Closure Report for your site A factor was inadvertently dropped from the calculations <br /> -for contaminant mass estimates using the Lyman, Reidy and Levy (1992) formulas in the <br /> Site Closue Report dated December 12, 2000 In order to provide comparable estimates for <br /> all parties to review, the contaminant mass estimates have been recalculated using a general <br /> formula of contaminant affected mass tunes soil density times average contaminant <br /> concentrations The recalculated estimates are presented below <br /> Soil-Contaminant Mass Estimated Removed <br /> • TPHG <br /> Area of 4,950 ft3 x average soil density 1001b/ft3 x 0 000997 ppm = 457 6 lb <br /> 457 6 — 6 8 lb/gal petroleum product =67 2 gallons TPHG <br /> Benzene <br /> Area of 4,950 ft3 x average soil density 1001b/ft3 x 0 000001541 ppb = 0 76 lb <br /> 0 76— 6 8 lb/gal petroleum product = 0 11 gallons Benzene <br /> MTBE <br /> Area of 4,950 ft3 x average soil density 1001b/ft3 x 0 000000875 ppb = 0 433 lb <br /> 0 433 —6 8 lb/gal petroleum product=0 063 gallons MTBE <br /> Soil-Contaminant Mass Estimated Remaining <br /> TPHG <br /> Area of 2,700 ft3 x average soil density 1001b/ft3 x 0 001328 ppm = 358 5 lb <br /> 358 5 — 6 8 lb/gal petroleum product = 52 7 gallons TPHG <br /> Benzene <br /> Area of 2,700 ft3 x average soil density 100 lb/ft3 x 0 000003134 ppb = 0 84 lb <br /> 0 84 6 8 lb/gal petroleum product= 0 12 gallons Benzene <br /> MTBE <br /> Area of 2,700 ft3 x average soil density 100 lb/ft3 x 0 000001324 ppb = 0 35 lb <br /> 0 35 -1-6 8 lb/gal petroleum product = 0 052 gallons MTBE <br /> • <br /> 67 E 10th Street o Tracy,CA 95376 <br /> 209 833 0758 • Fax 209 832 5152 <br /> wnght@inreach com Lic #651501 A-B HazMat Page 1 ice, <br /> websit hup//home inreach com/wrtght <br />