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�— %an/ kn KLEINFELDER .L. recorded on Purge Characterization and Sample Logs (Attachment B). Prior to cementing the borings, depth to groundwater was measured and indicated on the soil boring logs. 9.0 SAMPLE HANDLING AND ANALYTICAL RESULTS Soil and groundwater samples collected from borings GP-1 and GP-2 were submitted under 16m chain of custody documentation to Alpha Analytical Inc., a California State-certified laboratory in Sparks, Nevada. As requested by PHS/EHD, selected soil and groundwater samples were analyzed for: V • Total Extractable Petroleum Hydrocarbons as motor oil by DHS/LUFT methods ry • Total Purgeable Petroleum Hydrocarbons as gasoline by DHS/LUFT methods • BTEX, Fuel Oxygenates, EDB, and 1,2 DCA by EPA Method 8260 The samples were analyzed on a 5 to 10 day turnaround schedule. The laboratory results were below the detection limits for all requested analytes on all the soil and groundwater samples. Laboratory analytical data sheets and the chain-of-custody documents are attached to this report (Attachment Q. CONCLUSIONS AND RECOMMENDATIONS The following conclusions and recommendations are based upon field observations, and laboratory analytical results. • Analytical results of the soil and groundwater samples collected adjacent to and beneath the former underground storage tanks were all below the indicated laboratory detection limits. • Kleinfelder does not recommend further evaluation. • Kleinfelder recommends that you contact Mr. Jeff Wong at the San Joaquin County Public Health Services, Environmental Health Division to discuss options for disposal of the stockpiled soil and backfilling of the former UST cavity. • A copy of this report should be submitted to Mr. Jeff Wong at the San Joaquin County Public Health Services, Environmental Health Division for review and comment. LIMITATIONS Kleinfelder has prepared this report in accordance with the generally accepted standards of care which exist in northern California at the time of writing. It should be recognized that definition and evaluation of geologic and chemical subsurface conditions are difficult. Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the subsurface and/or historic conditions applicable to the site. The conclusions of this assessment �. are based on field observations and analytical results obtained from soil and water samples collected from the site. More extensive studies may further reduce the uncertainties associated L. 20-4489-01-E01/2000L859/2000W035 Page 3 of 5 Copyright 2000 Kleinfelder,Inc. September 14,2000 LN