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N > f r Delta Environmental Consultants, lr11c. 11030 While Rock Road.Suite 110 Rancho Cordova,CA 95670 916 638.2085 April 19, 1988 Mr. Darrell Robinson Shell Oil Company 100 Howe Avenue, Suite 160 N Sacramento, CA 95825 f Subj: Preliminary Pre-Tank Pull Soil Assessment Moreland Court Shell 7700 Moreland Court Stockton, CA Delta Project No. 40.88-146 Dear Mr. Robinson: The purpose of this letter is to inform Shell Ail Company of the results relatinf to y the work conducted at the above-referenced site on April 4, 1988. The field work conducted on this date involved drilling six soil borings for the i, purpose of assessing the soils before excavation and removal of the existing� under- ground storage tanks,and the excavation of the hole at the proposed location of the i new underground storage tanks could proceed. A site map showing the soil boring n Iocations are presented in Figure 1. l Assessment of the soils around the existing tank cluster, involved drilling four soil Ei borings(B-1 through B-4) through the backfill to a depth of 20 feet. Assessment of the soil: :: the proposed location of the new tank cluster, involved drilling two soil borings(B-3 and B-4)to a depth of 15 feet. Soil samples from each soil borinj,were collected every five feet in brass tubes with a California modified sampler...Qne tube from each sample was sealed and placed in an ioe chest at 40C for storage. The soils in the second brass tube were placed in jars and screened with an hNu meter for total organic vapors. a Et Preliminary screening of the soil samples with the rNu meter did not detect the ?j presence of hydrocarbons(Table 1). Soil samples were not sent to the laboratory for k TPH analysis, as field screening did not indicate a problem. j f z � ii Practical Solutions to Environmentai Concerns }