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in June 2002 during the quarterly groundwater monitoring activities The product appeared sometime after the monitoring event Since it's discovery, ASE has been removing this product from the wells using a product-recovery bailer, and storing it in a drum within the treatment system compound FREE-PRODUCT SAMPLING AND ANALYSIS ASE collected samples of the product from each well and had the samples analyzed by Kiff Analytical for TPH-G, BTEX, the seven fuel oxygenates and lead scavengers by EPA Method 8260B A copy of the certified analytical reports are attached as Appendix B Kiff Analytical report #28537 details the results of the two free-product samples from monitoring well MW-6 and piezometer P-4 (lab numbers 28537- 0 1 8537- 01 and 02) A third sample was created by analyzing the water below the floating product in one of the sample containers (lab number 28537-03) Kiff has also included the chromatograms for these samples No oxygenates were identified in any of the samples collected on September 10, 2002 Kiff's explanation was that the samples appeared weathered, possibly due to t h e remedial activities within the zone where product was discovered • Kiff Analytical report #28623 details the results of the air bag sample collected from the influent vapor stream of the vapor-extraction wells This report includes the chromatogram, in three different scales The intent of providing the chromatogram for this air sample is to show the size of the Butane and 2- Methyl Butane peaks as compared with the bulk of the other compounds present in the sample This was performed at the request of another forensic laboratory, Friedman & Bruya, Inc of Seattle Washington, whom we asked to review this current and historical product data Friedman & Bruya, Inc (F&B) was given the latest Kiff Analytical reports of the product, water and air samples along with the Zymax report issued last year regarding the product samples collected by SJCEPD ASE asked F&B to review the data to provide their opinion on the likely age of this newly discovered product F&B's letter report is attached in Appendix C In essence, F&B contends that • The presence of butanes in the air bag sample strongly suggests that t h e site has been impacted by a release of less than 3 years old, . • Determining the age of the product is difficult due to the operation of a vapor recovery system, where the rate of volatilization losses is greatly Frank's One Stop Remediation System Monthly Report — August & September 2002 -4-