SITE INFORMATION AND CORRESPONDENCE FILE 1

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V ® INTERNATIONAL TECHNOLOGY CORPORATION February 12, 1991 FEB 13 '1991 Ms. Eleanor Ratl i ffe Ci-�,v1 0NM@i ffALNrAL�H Public Health Services 1'tRN;13lSE(2viCES San Joaquin County P.O. Box 2009 Stockton, California 95201 Dear Eleanor: On behalf of BP Oil , IT requests approval to excavate limited amounts of material from the two former UST pits at BP Oil Station No. 11192, located at 1403 Country Club Drive in Stockton. Limited excavation would be performed in order to remove material which is unsuitable for engineering and construction purposes. Specifically, loose backfill (pea gravel and sand) . and native material which was dug up but not removed from the pits during sampling (2/8/91) would be removed. It is important to remove these materials so that a uniform, engineered backfill may be placed to allow proper compaction and prevent settlement of pavement and structures. Excavation would proceed to a depth of 13 feet in each of the two former UST pits. This is the depth at which samples of native material were taken and materials above this depth consist dominantly of fill, and dug-up. native soil . Materials removed from each of the two pits would be stockpiled separately, both from each other and from any previously excavated soils. They would then be sampled for disposal , as follows: • From the fuel UST pit, for TPH-g and BTEX, one composite sample per every 50 cubic yards. • From the motor/used oil UST pit, for TPH-d and BTEX. Further analysis to be -made if-any .detections. One composite sample per every 50 cubic yards. . It is estimated that 300 additional yards would be removed from the former fuel UST pit and up to 200 additional yards from. the former oil UST pit. Regional'Office 4585 Pacheco Boulevard.Martinez;California 94553•415-372-9100 IT Corporation is a wholly owned subsidiary of international Technology Corporation