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procedures and regulatory agency guidelines. Please note that the March <br /> 26 report reads, "With the exception of the lack of hydrocarbons in AW-3, <br /> the analytical data from this event for all other wells is consistent prior to <br /> November 1991." <br /> Fourth Issue: Purge water disposal documentation was not included with the monitoring <br /> report. <br /> Response: Alton Geoscience has arranged with Balch Petroleum to provide copies of <br /> their "Disposal Forms." <br /> In response to SJCPHS questions regarding the validity of the February 21, 1992 data, it is <br /> our opinion that field procedures were in accordance with industry standards and believe the <br /> samples collected were representative of ground water conditions at that time. While <br /> false positives can occur due to cross-contamination in the field, false negatives (e.g. <br /> hydrocarbons not detected)for total petroleum hydrocarbons quantified as gasoline (TPH-G) <br /> or diesel (TPH-D) are uncommon, especially for diesel,which is relatively nonvolatile. Since <br /> these samples were collected, stored, and transported following standard protocol, Alton <br /> Geoscience requested and received copies of the original chromatograms from Sequoia <br /> Analytical as supporting documentation of the reported laboratory results; copies of these are <br /> attached. <br /> t� <br />