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GEOFON <br />I N C O R P O R A T E O <br />65 QUINTA COURT, SUITE D, SACRAMENTO, CA 95823 <br />16 January 2002 TELEPHONE: (916) 681-3601 • FAX (916) 681-3628 <br />INTERNET: www.geofon.com <br />Mr. Larry Smith <br />Administrative Contracting Officer <br />Sacramento Resident Office <br />Corps of Engineers <br />2194 Ascot Avenue <br />Rio Linda, California 95673-9988 <br />Subject: Comments / Responses <br />Underground Storage Tanks Closure Report, Building 330 <br />Lathrop, California <br />Contract No. DACW05-00-D-0008, Delivery Order # 0007 <br />Geofon Project No. 05-5546 <br />Dear Mr. Smith: <br />The following are responses to the comments made by Maurice Benson (DDJC) and John <br />Guzman (DDJC) regarding the closure report for the UST removal activity at Building 330. <br />Comment - Page 12 - "On page 12 paragraph 2, it mentions that the range of test results (for <br />TPH-D) in samples SP -1, SP -2, SP -4, SP -5 and SP -6 was from 12 to 190 mg/kg. Table 3 <br />indicates that the results for those sample IDs ranged from 12 to 21 mg/kg. The result of 190 <br />mg/kg was a duplicate sample taken with the pipeline samples PL -1 and PL -2". <br />Response - The range of test results (for TPH-D) in samples SP -1, SP -2, SP -4, SP -5 and SP -6 <br />has been changed from 12 to 190 mg/kg to 12 to 21 mg/kg. <br />Comment - Tables 2 & 3: Is T DUP-1 a duplicate of T-6? Clarify" <br />Response - Yes, T DUP -I is a duplicate of T-6. Changes have been made to tables 2 & 3. <br />Comment - Tables 2&3: "Is DUP-1 a duplicate of PL -2. Clarify" <br />Response - Yes, DUP -1 is a duplicate of PL -2. Changes have been made to tables 2 & 3. <br />Comment - Table 1: "Add cross reference ID matrix." RI/FS UST # SJC-EHD UST# <br />62 TA 1898-52 <br />76 TA 1898-53 <br />Response - The cross reference ID matrix suggested has been made on Table]. <br />