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SAMPLE PROTOCOL STOCKTON FACILITY There is an area approximately thirty foot by thirty foot in the rear yard that is not covered with vegetation. It is the low area of the yard and during the wet season is covered with water. On July 28, 2005 a soil sample was collected by Kasey Foley with the San Joaquin County Environmental Health Department. The sample was submitted to GeoAnalytical Laboratories who conducted a CAM 17 TTLC analysis. The analysis indicated it was high for chromium. A STLC analysis was conducted confirming the chromium to be above California limits. A Title 22 "Hazardous Waste" Toxicity Evaluation was also conducted on the sample. The conclusions indicated the sample was not acutely toxic to flathead minnows and should not be considered a hazardous waste with respect to fish toxicity. San Joaquin County Environmental Health Department indicated this evaluation would not need to be repeated. Sierra Chemical Co. was directed to establish a sampling plan to determine if the area is indeed high in chromium or if the grab sample was an anomaly. The following protocol is that plan. The area will be marked into numbered 10 foot square grids separated into quarters. The quarters will be labeled a, b, c, &d starting in the upper right hand corner and going clockwise. A letter will be drawn to randomly select in which quarter of each grid the sample will be collected. A distinct sample will be collected from the top 4 inches blended, split and labeled. One split will be provided to the San Joaquin County Health Department. The other will be delivered by Sierra Chemical under chain of custody to a California Certified Lab. The lab will conduct a CAM 17 TTLC analysis. If chromium exceeds California limits a STLC analysis will be performed. Between each sample the tool used for collection will be washed with a phosphate free detergent(Liqui-Nox), rinsed with distilled water and dried. Caution will be taken not to track any potential contamination to the sample locations. Sample collection will be from the edge of the area working to the center.