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Sampling of Excavated Soil December 22 , 1988 Marlowe Properties, Stockton, California AGS 38033-1 a�. Upon authorization from the San Joaquin Local Health District, Air Pollution Board, RAMCON spread the soil for aeration. On October 12 , 1988 , a geologist from Applied GeoSystems sampled the aerated soil at the locations indicated on Plate P-2 . The �- samples were collected using a percussion sampler to drive a clean brass sleeve into the soil spread approximately 1 foot thick. The sleeves were removed from the sampler and sealed with aluminum foil, plastic caps, and airtight tape. The samples were then labeled and immediately placed in iced storage for transport to the analytical laboratory. A Chain of Custody Record was initiated by the geologist in the field and accompanied the samples to the laboratory; copies of these records are included with this letter report. The group of three samples (A-B-C) was composited by the analytical laboratory into one sample. In this manner, Applied GeoSystems analyzed one i. composite sample for approximately 45 cubic yards of soil. The soil samples were analyzed for total petroleum hydrocarbons as gasoline by modified Environmental Protection Agency (EPA) Method 8015 and the volatile organic constituents benzene, ethylbenzene, toluene, and total xylene isomers by EPA Method i• 8020 . The analysis was performed at Mobile Chem Labs in San Carlos, California, which is certified by the State of California to perform the requested analyses. Copies of the laboratory analytical reports are attached to this letter report. Results of the chemical analyses are presented on Table 1 and indicate that hydrocarbon constituents in the aerating soil are below �. laboratory detection limits. Applied GeoSystems recommends the soil be disposed of onsite as topsoil in an appropriate location. A copy of this report should be forwarded to Ms. Diane Hinson of the San Joaquin Local Health District, 1601 East Hazelton Avenue, P.O. Box 2009, Stockton, i. California 95201. 2 App/led GeoSystems