SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Ninth Bullet Item Mobil Oil has proceeded with the project in a reasonable and timely manner within the standards of good engineering practice and without compromising the requirements of the regulatory agencies and overall quality of the project. Available records and documents do not support Ms. Bice's contention that Mobil has been delaying the project. To the contrary, Mobil should be commended for it's effort in accommodating the requirements and concerns of the property owners while complying with applicable regulations. The SJPHS commented to Mark III in April 1992 that Mobil Oil was proceeding in a reasonable and timely manner. SPECIFIC COMMENTS Section 1.2, Pages 1-1 and 1-2 First Bullet Item A work plan issued by KEI on September 15, 1988, indicates that one, 1,000-gallon underground storage tank was removed from the site, and that soil samples were collected under the auspices of Captain A. C. Halford of the City of Tracy Fire Department on August 22, 1988. Second Bullet Item The purpose of this report was not to provide an exhaustive summary of all activities associated with the subject site. Data which was considered relevant to the completion of the health risk assessment, and which provided an overview of the site characterization and remediation activities was included in the prelude to the health risk assessment document. Third Bullet Item, First Paragraph The soil sampling activities described in Alton Geoscience's report dated December 14, 1990, were based on the requirements of the potential disposal facilities. The sampling program was designed to characterize the soil at two depth intervals; from ground level to 5 feet below grade (fbg) and from 5 to 10 fbg (depth to ground water). Two discrete samples were collected from each depth interval at each borehole. For the soil interval between ground level and 5 fbg, samples were collected at depths between 1 and 5 fbg. For the soil interval between 5 and 10 fbg, samples were collected at depths between 6.5 and 10 fbg. A total of 186 discrete samples were collected and composited into 12 samples. The samples were analyzed for total petroleum hydrocarbons (I'PH-D and TPH-G), benzene, toluene, ethylbenzene, and xylenes. Since the sampling results described in the December 1990 Alton Geoscience document were conducted on composited samples (as previously described), Geomatrix' statement that"high concentrations of diesel and gasoline were generally detected in samples collected from 9.5 to 10 feet" is false. 4