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2101 Webster Str ee <br /> 12th Flom' <br /> Oaklarid. CA 94612 <br /> (5103 E368-4-1.00 • FAX:(510):663-4.1 A"i. GEOMATRIX <br /> May 9,2002 <br /> Project 7243.001 <br /> Mr.Robert'Movidh. <br /> C hevro rk d ental auageme�t C mp y <br /> 6001 Bo1linger,Canyon Road <br /> P.O Box 6012 <br /> San Manion,Cali ornia 94583 <br /> Subject. R=ponseto Comments—January 2,2002 Later <br /> Pombo Property <br /> Tracy,California <br /> Dear Mr.Mihalovaicl., <br /> Geornatrix Gonsultants sue.(Geamatrix),has prepared this fetter to respond to comments. <br /> provided by the aarttnent Of Toxic Substances Control(DTSC)Human and Ecological <br /> Risk Ir}ivisid3 (lit}to Z;herrt<sn `ea dant January 2,20(I2,regarding its review of <br /> Report ofAddition4f8oitand Gxoundwatee finiesligation,Pombo Property(5an>,Toaqu)s ` <br /> County APRs 232 170-07),, 12`53 West 11th Street, Tracy, California(December 2000),:and { <br /> Results ofthe Updated Human-Health,ScreeningRiskEvaluation;Pombo Property(San <br /> Joaquin CountyAPS232-:170-07), 1 55 West.11th Street, Tracy, California(October 4, <br /> 2001). <br /> Geornatnx onginalIy prepared a soil and investigation report' that included a human health <br /> e <br /> screening eva2ua..dti dated January 17,200(). DTSC provided comments on the evaluation in A <br /> a memorandum dated March 14,2000. Geomatrix responded to these com meats in-a letter <br /> dated March 29,2000 ansl DTSC:eoncurred with the findings of the evaluation:in.a Apti127, <br /> 2000 letter. The October 2001 updated human health screening risk evaluation that is the. <br /> subject oftheeur' --reviewarras prepated by Creorrma4ix. The October 2001 evaluation <br /> included additional data UrA werescollect+ed subsequent to the carnpletion ofthe.Tazttuary 200? <br /> evaluation. <br /> Responses to each IEMD;comment pertainingto Geomatrix's 0 ober 2001 updated <br /> evaluation are presented:below following the individual comutent in the letter and as <br /> discussedduring theApril.22,2002 meeting between ChevronTexaco,,DTSC,atW Geomatrix. <br /> GENERAL Co11wEN s <br /> s <br /> d. HERD reviewed the r ecumAwI for technica e,ccuracy andvalidity of the screeningAwd <br /> Kok assessment. <br /> No response refiled; <br /> i Solt and GrnrrndWater:lnvaugaiion:Report and Human Health Scremsing Evaluation,poinbo t'r'qpaot <br /> prepared by Gcomatrix Cansuftants,Itc., January 17,2002 <br /> ©eornelGrix Consult: Ina. <br /> Fncgineem,G,%►ID&ts i or l i n enpl ScienCisE3 <br />