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k`i KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> The O'Conner Woods Retirement Community is located at 4000 Wagner Heights Road in <br /> Stockton, California (Plate 1). Two underground fuel storage tanks at the site were <br /> excavated and removed, and the excavations were backfilled without soil samples being <br /> collected as required by the Regional Water Quality Control Board. <br /> On December 18, 1990, one soil boring was drilled to 15 feet at each of the previous tank <br /> locations. Kleinfelder collected soil samples at five foot intervals, and qualitatively <br /> screened the samples with an organic vapor monitoring instrument that uses a <br /> photoionization detector (PID). The PID instrument responses were insignificant during <br /> drilling. The sample collected at the terminus of each boring was submitted under chain- <br /> of-custody to California Analytical Laboratory/Enseco. The samples were analyzed for <br /> purgeable and extractable total petroleum hydrocarbons; and, for benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX). Neither of the samples submitted for analysis <br /> contained petroleum hydrocarbons or BTEX above the laboratory reporting limits. <br /> F17-91-11 1 <br /> Copyright 1991 KLeinfelder, Inc. <br />