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Quik Stop Station No 39 February 14, 2003 Stockton California Results Report and Work Plan Addendum representative samples of the drill cuttings stockpile for characterization and disposal purposes Construct monitoring wells with 2-)Inch inside diameter (ID), flush-threaded, Schedule 40, polyvinyl chloride (PVC) casing and 2-inch ID, PVC, 0 020-inch slotted well screen set at 40 to 60 feet bsg Install #3 sand filter pack adjacent to and extending approximately 2 feet above the screened intervals Install bentonite chip on top of the sand to seal the filter packs Neat cement sanitary seals shall be set in the remaining annulus above the bentonite The flush- mounted well heads shall be fitted with locking caps and the surface shall be completed with flush-mounted traffic-rated vault boxes A typical monitoring well construction diagram is contained Appendix E Submit selected soil samples from the new monitoring well borings and submit, under COC documentation to Kiff for analysis of TPHg, BTEX, the seven fuel oxygenates, DCA and DBA by EPA Method 8260B Additionally analyze the stockpile soil sample for total lead by EPA Method 6010 Task 3 Develop and sample the new monitoring wells according to Horizon Field Methods and Procedures Survey the top-of-casing elevation of the new monitoring wells to GeoTracker specifications Submit groundwater samples, under COC documentation, to Kiff for analysis of TPHg, BTEX, the seven fuel oxygenates, DCA and DBA by EPA Method 8260B Task 4 Prepare a report which documents installation of the additional monitoring wells and analytical results of soil and groundwater sampling Evaluate the analytical results for delineation of lateral and vertical extent of petroleum hydrocarbons in groundwater C Trojects%703%141WPaddnm2-03 doc Project No 7039 14 7 HORIZON ENVIRONMENTAL INC