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Environmental <br /> Mr Harlin Knoll Resources <br /> 27 April 1998 Management <br /> Page 5 <br /> 1 <br /> was detected in the MW-5 sample, this detection (0 130 mg/1) also <br />' represents one of the lowest historical benzene detections of any of the <br /> samples collected from this well during the quarterly monitoring <br /> program (Table 1) Historical trend analysis indicates that TPH and <br />' BTEX concentrations have decreased significantly over time in ground <br /> water samples collected from Former Tank Site #1 <br />' General Water Quality_Results. As presented in Table 3, the general <br /> water quality parameter measurements do not exhibit notable trends at <br /> this time, as evidenced by comparison of post-ORC to baseline (October <br />' 1996) conditions The increase in heterotrophic plate count in the samples <br /> collected from MW-4 and MW-5 indicates that the presence of the ORC <br />' socks is enhancing microbial activity <br /> Former Tank Site #2 <br />' TPH and BTEX Results. TPH and BTEX detections in ground water <br /> samples collected from the Former Tank Site #2 during the December <br /> 1997 monitoring event are also comparable to those associated with <br /> historical sampling events TPH(g) was detected in the MW-1A and <br /> MW-2A samples, the highest detection (0 44 mg/1) was associated with <br />' MW-2A TPH(d) was not detected in any of the three wells sampled <br /> during this event BTEX compounds were detected in the MW-1A and <br />' -2A samples Historical trend analysis indicates that TPH and BTEX <br /> concentrations have decreased significantly over time in ground water <br /> samples collected from Former Tank Site #1 <br />' General Water Quality Results. As presented in Table 4, the general <br /> water quality parameter measurements do not exhibit notable trends at <br />' this time, as evidenced by comparison of post-ORC to baseline (October <br /> 1996) conditions The increase in heterotrophic plate count in the <br /> samples collected from MW-1A and MW-2A indicates that the presence <br />' of the ORC socks is enhancing microbial activity <br />' CONCLUSIONS <br />' As 1n past sampling events, TPH as gasoline and BTEX compounds were <br /> detected in ground water samples collected at the Catellus properties <br /> located at 1325 and 1515 West Weber Avenue The magnitudes of the <br />' TPH and BTEX detections are comparable to those of recent historical <br /> I <br />