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• QUARTERLY MONITORING WELL FINDINGS Western Oil & Spreading Inc. Acampo Plant Site - 19256 N Highway 99, Acampo, CA Site June 26, 2004 SAMPLING PROCEDURE On June 26, 2004, Don Light of Del-Tech Geotechnical Services (DelTech) sampled WOS Monitoring Wells Nos 1 through 6 He removed the cover and the secured expansive plug from the enclosed 2 IN PVC casing After a small portion of the undisturbed water was withdrawn using a clean bailer and visually examined it for any free phase product Depth to water surface was measured with an indexed tape and probe The depth to water surface from the north edge of the top of the PVC well casing (TQC) and recorded The well casing was purged using a dedicated Waterra Inertia Pump with a clear PE tube with a ball foot valve evacuating six volumes of the casing A grab sample from the bailing tube was measured periodically for pH, EC, temperature, O R P and Dissolved Oxygen as well as visual characteristics noted Following sampling the Waterra sample tube was left in place in the well casing The well cap was replaced secured and the well left to recover Reference ATTACHMENT 6, GROUNDWATER SAMPLING RECORDS AND FIELD SUMMARY Later after well recovery sufficient sample to fill one each labeled quart amber glass 1 bottle was collected using the Waterra system VOA samples were not collected as results have been below detectable levels for some time All bottles were placed in an iced cooler and delivered to Sequoia Laboratories via Dan Barber, P E under chain of custody(C of C)for analysis ANALYSIS PROCEDURE The samples were analyzed for TPHd, using DHS LUFT protocol BTEX is no longer being measured as it has not been detected during prior sampling of groundwater Results are presented in tabular form with sample location site map as ATTACHMENT 2, "SITE CHARACTERIZATION -SUMMARY OF LAB RESULTS"