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Joten P. Cummings & A g ssAiates Environmental Consultants ,i,Ar HEAl_lff Ph.(540)30607?2 FRVICE P.O.Box 2847 Fax1E1)7El-33t16 Fremont, CA 94836-2847 File No.0396012.00 99 JUN It; Alf tt34 June 7, 1999 Carol Oz, REHS San Joaquin County PHS-EHD 304 East Weber Ave. , 3rd Floor Stockton, CA 95201 RE: Addendum Letter to the File Closure Report 7777 West Eleventh Street okcy . 9 7 6 S td- 'tb X243— - -- __--- Dear Ms Oz: This addendum is being forwarded to you, by John P. Cummings and Associates (JPCA) , to elucidate some of the information which was not clear and to correct the soil data errors in the original report, dated 10 May 1999. This information is submitted based on questions you and I discussed in our telephone conversation. The information found in Table A of the original File Closure Report was taken from MSDS, Handbook of Chemistry and Physics, CRC Press, 18901 Cranwood Parkway, Cleveland Ohio and Conversion Factors, The University of Chicago Press, Chicago, IL. The Well Survey data reported by the City of Tracy was that no known wells exist to the north, (the Tracy City limits are adj-acent to the subject site boundary on the northern side) within 2,000 feet of the former UST excavation. A reconnaissance _ Lir automo�rie and binocularz conducted by JPCA did not observe any wells to the north of the subject site within 2,000 feet. The thickness of the first aquifer, identified as ten feet, was based on the field drilling soil analysis and boring log data. The Non Detectable boundary for soil was estimated from the field drilling and boring log data as well as the information identified in the SMITH Reports. The soil results from the boring identified as MW 3 along with the information contained in the SMITH Reports was used to ascertain the lateral limits of soil contamination. The TPHG data in Table B was erroneously transposed. The data from the original UST excavation report is not germane as the 1