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_ Former Beacon Station No 12419 March 18,2002 Stockton California Problem Assessment Re ort/Correcttve Action Plan Soil cuttings were stockpiled at the site on and covered with plastic prior to characterization and disposal Four representative soil samples were also collected from the drill cuttings stockpile after completion of the monitoring wells The soil samples were collected and handled as described in the attached Field Methods and Procedures (Appendix D) Possession of the samples was recorded on chain-of-custody documents Soil samples were field screened for the presence of volatile petroleum hydrocarbon vapors with a portable photo-ionization detector(PID) Soil boring logs were kept during drilling to record soil descriptions, sampling information, field screening data, comments regarding drilling progress, and well construction details Soils were described using the Unified Soil Classification System (USCS) Soil boring logs and a boring log symbol key is contained in Appendix E Two-inch diameter, flush-threaded, Schedule 40 PVC wells were installed in the soil borings The air sparge wells AS-2 and AS-3 were screened with 0 010-inch slotted PVC pipe set over intervals of approximately 123 to 128 feet bsg and 80 to 85 feet bsg, respectively A #3 sand filter pack was placed adjacent to and approximately two feet above the top of the screened intervals Two-foot thick bentonite filter pack seals were placed on top of the filter pack A neat cement sanitary seal extending to the surface was placed on top of the bentonite seal The well heads were fitted with locking caps and the surface was completed with traffic-rated vault boxes Soil samples collected at depths of 90, 100, 110, 120, 125 and 130 feet bsg from the air sparge well AS-2 boring were selected for analyses Soil samples collected at depths of 16, 26, 51, 61, 81 and 86 feet bsg from the air sparge well AS-3 boring were selected for analyses The four stockpile soil samples were submitted for analysis as a composite sample Selected soil samples from the monitoring well borings and four representative samples from the soil stockpile were submitted to Kiff Analytical LLC (Kifl), a California 419PARCAP3-02 doc 7 Protect No 1419 23 HORIZON ENVIRONMENTAL INC.