SITE INFORMATION AND CORRESPONDENCE_FILE 2

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Epig;ene International CONSULTING GEOLOGISTS February 8,.1994 Ms. Pamela S. Violet, R.E.H.S. San Joaquin County Environmental Health Division P.O. Box 2009 Stockton, CA 95201-2009 Subject: Detailed History of Chain of Custody of Soil Samples Collected During the Removal of Underground Tanks and Associated Piping at the Stockton Police Station Dear Ms. Violet, The removal of the underground tanks at the subject site and subsequent sampling was carried out on Friday, Decembor 17, `1993. The sampling activities continued past 7:00 P. M. As you may recall, you and your coworker, Mary, not only observed but in fact, directed the entire sampling effort. Each soil sample as collected,was sealed, labeled and placed directly in a cooled ice chest. As you may recall, the blocks of ice in the chest did not satisfy your concerns and additional bags of ice were purchased and also placed in the chest. Upon completion of the sampling on Friday night, the samples were taken to my office in Fremont, Califomia, and taken from the ice chest and placed immediately in a refrigerator in my office dedicated to sample storage. The soil samples were maintained in my custody, in my office over the weekend as the pre-selected and pre-approved laboratory (Spargor Technology, Ino. in Sacramento) was closed. On Monday morning upon arriving at my office, I received an urgent request to Investigate a landslide that was Impacting an existing residence. By the time I returned to the office, it was too late to ship the samples such that they would be received by the laboratory on Monday night. As I was scheduled to collect samples from below the product line at the subject site an Tuesday morning of the following day, I made a decision to maintain the samples in my refrigerator, in my custody and send all of the soil samples (Friday and Tuesday) to the laboratory together. On Tuesday, December 21, 1993, 1 collected soil samples from various locations below the product line and dispenser area. If your notes do not indicate that I was present for this sampling, I will be happy to provide you with photographs and/or other documentation of collecting the samples. Again, you and your coworker, Mary, directed the sampling effort and observed as I sealed, labeled, and placed each sample in my ice chest. 1 noted that you were satisfied with the quantity of ice in the chest. Upon completion of the sampling that was carried out to your satisfaction in the field, I compictod a Chain-of- .38750 PASEO PADRE PARKWAY, 51JITE B-4 • FREMONT, CALIFORNIA 94536 ■ (510) 79 1-1986