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Chuck Carmel <br /> Page 3 <br /> immediately. Remediation will proceed when the contamination has been defined and equipment is <br /> available. r T <br /> Facility 434 at 501.W. Kettleman Lane; Loll <br /> PHS/EHD contact-Margaret Lagorio <br /> Extraction of the groundwater was started but groundwater sample results indicated contamination <br /> was non-detectable so the system was turned off. The system will be operated intermittently. If the <br /> sample results continue to indicate non-detect, the groundwater extraction system will not be used. <br /> Monitoring well MW-2 is biofouled. Attempts of jetting and ramming it out have been unsuccessful. <br /> Vapor extraction and quarterly monitoring will continue. <br /> Facility 6100 at 25775 Patterson Pass Road,Tracy t {; <br /> PHS/EHD contact- Margaret<Lagorio <br /> V'S <br /> . <br /> Sail boring B-26,drilled on the other side of Patterson Pass Road,from the station,showed evidence <br /> of soil contamination to a depth of 110 feet. Additional investigation of the soil has been proposed. <br /> Depth to groundwater for this site remains to be confirmed. The on-site water supply well depth to <br /> water after its development was 100 feet below ground surface. PHS/EHD requests the current depth <br /> to water in this well be determined. Site investigation will continue and remediation will proceed <br /> 'when the investigation has been completed and equipment is available. <br /> Facility 2093 at 3425 N.Tracy Boulevard, Tracy �+% , <br /> ' PHS/EHD contact Harlin Knoll 1 " <br /> '17his site has'soil and groundwater contamination with one on-site well containing free phase <br /> petroleum hydrocarbon. Arco and Brown&Caldwell plan to install piping to the existing monitoring <br /> well and begin vapor extraction.soon. Groundwater monitoring and sampling will continue on a <br /> quarterly basis until cleanup is complete. <br /> Facility 750 at 225 S. Cherokee Lane,`Lodi <br /> PHS/EHD contact - Linda Turkatte <br /> The current proposal for additional soil borings/vapor wells in the area to the west, to the north and <br /> oto the east of the former waste oil tank was discussed and the additional work was considered to be <br /> t warranted. <br /> The area of B-5 and B-20/VW-10 was discussed. Although the laboratory results showed non-detect <br /> for the total depth of the borings,the field observations indicated the borings to be contaminated to <br /> e their total depth. An explanation for the apparent discrepancies between the field observations and <br /> }' the laboratory results may be the way the samples were handled in the field before they were <br /> submitted to the°laboratory.'; Nevertheless, this area is considered to be an area of concern for <br /> PHS/EHD. However,it appears that it will be encompassed within the estimated radius of influence <br /> of the proposed remediation system and will be addressed. <br /> The new tank pit area was also discussed as an area of concern for PHS/EHD. Contamination was <br /> noted during soil sampling at 12 feet below ground surface (BGS) in this area before the installation <br /> of the new tanks: However,the subsequent soil borings indicated non-detect conditions to their total <br /> depth of 20 feet BGS. It is unclear why the contamination was not detected in the subsequent borings <br /> and that additional confirmation work will need to be done to verify this area is no longer a problem. <br /> In addition,it was discussed that the estimate of the radius of influence of the remediation system may <br /> be conservative and RESNA feels that the remediation efforts would also reach this area. <br /> r <br /> 3 <br />