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June 16, 1998 %"K %WOO <br /> Page 2 <br /> Response to Request for Additional Information <br /> Errors in previous documents have created confusion regarding the number of <br /> generations of fuel tanks used at the subject site. In a December 22, 1997 Work Plan for <br /> Underg7-ound Storage Tank Replacement, PEG reported that the facility included three <br /> 10,000-gallon fuel tanks and one 12,000-gallon fuel tank. This statement was in error at <br /> the time of the December 22, 1997 document. In a May 1, 1998 document titled Soil <br /> Sampling Results for Station Upgrade, PEG reported that four 10,000-gallon fuel tanks <br /> were removed from the subject site. That statement was also in error. <br /> At present, exactly two generations of underground fuel storage tanks have been used at <br /> the subject site. The first generation of underground fuel storage tanks included two <br /> 6,000-gallon fuel tanks, one 10,000-gallon fuel tank, and one 12,000-gallon fuel tank. <br /> These fuel tanks were installed in 1984 by Mobil Oil during the construction of the <br /> facility. The tanks were removed on February 4, 1998, during tank replacement <br /> activities performed by Tosco. <br /> The second generation of underground fuel storage tanks was installed follovimg the <br /> February 1998 removal of the first generation of fuel storage tanks. The second <br /> generation of fuel tanks includes three 10,000-gallon fuel tanks, and one 12,000-gallon <br /> fuel tank, which remain in service at present. <br /> In response to the January 15, 1998 RWQCB request for additional information, the <br /> original underground storage tanks were removed from the site in February, 1998, as <br /> described above. Details of the investigation performed during the February, 1998 tank <br /> removal activities were described in the attached May 1, 1998 document titled Soil <br /> Sampling Results for Station Upgrade. The May 1, 1998 report includes erroneous <br /> statements regarding the capacities of the removed fuel tanks. However, the remaining <br /> information presented within the May 1, 1998 report is considered valid. PEG <br /> anticipates that the information presented within the May 1, 1998 report will satisfy the <br /> January 15, 1998 RWQCB request for additional information- <br /> Request <br /> nformationRequest for Letter Requiring No Further Action <br /> A copy of the May 1, 1998 report titled Soil Sampling Results for Station Upgrade has <br /> been reviewed by Mr. Harlin Knoll of the SJCEHD. In a May 5, 1998 telephone <br /> conversation with PEG, Mr. Knoll presented the comments of the SJCEHD. The <br /> SJCEHD noted that soil sample PD-3, collected from beneath the central product <br /> dispenser island at a depth of approximately 3 feet below ground surface (bgs), <br /> contained a residual concentration of 1,800 parts per million (ppm) total purgeable <br /> petroleum hydrocarbons calculated as gasoline (TPPH-g). However, the SJCEHD <br /> further noted that soil sample PP-6, collected at a depth of 5 feet bgs, approximately <br /> 4 feet to the south-southeast of PD-3, did not contain a detectable concentration of <br /> 3111741 AICLOSLET.DOC <br />