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Chevron U.S.A. - Page 2 I hydrocarbons. The report concluded that shallow soils at the subject property were predominantly comprised of clay and sands underlain by interbedded silts and L clays to the maximum depth of the exploration. Ground water was not encountered -during the course of subsurface exploration. Minor levels of petroleum constituents were reported in one of the soil borings (C-D) •at approximate depths f� of 20 and 30 feet below existing grade. The report summarized that the chemical quality of the ground water at the subject property was not known, and that at least 22 ground water monitoring wells were situated within a 1/2 mile radius of the subject property. one monitoring well was described as existing at the subject property. A letter prepared by the San Joaquin Local Health District dated February 1, 1989 was received by Chevron U.S.A. on February 8, 1989, which directed Chevron to conduct further assessment of the subject property. I Pursuant to that letter, Chevron requested that Dames & Moore prepare a workplan for the installation of three ground water monitoring wells at the subject property. A proposed preliminary site characterization workplan 1 was prepared for the subject property which summarized the details of Dames & Moore's proposed investigation. The workplan was submitted to Chevron U.S.A. for review, and was also submitted to the San Joaquin Local Health District and -Central California Regional Water Quality Control Board offices for review. 1 Upon review of the proposed workplan, the Regional Water Quality Control Board commented that the workplan appeared adequate, and would forward an approval recommendation to the San Joaquin Local Health District for the proposed DAMES & MOORE