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• <br /> Delta Truck Sales, Inc. -3- 15 May 1991 <br /> HAR Review <br /> Page 19 No mention of whether field measurements of E.C. , pH, and Temperature were <br /> taken until stabilization occurred. It is noted that SI-1 was measured on 25 <br /> September 1990 and the other two wells were tested seven weeks later on 13 <br /> November 1990. An explanation is needed. ESE suggests that an interface <br /> probe contaminated from previous sampling an of free petroleum product was <br /> responsible for BTEX detected at 0.0035 mg/L in SI-2. <br /> Page 21 Conclusions- Staff concurs that soil samples from the east and west sides of <br /> the excavation indicate high lead and hydrocarbon levels are present and that <br /> further investigation is needed. If the landfill/ditch does extend form <br /> Highway 99 to Newton Road then additional soil borings may be a better was to <br /> proceed rather that just excavating the waste material and stockpiling it on- <br /> site. Ground water sampling needs to be continued, possibly a monitoring <br /> schedule needs to be implemented. Staff also leans toward the conclusion <br /> that much of the soil containing hazardous waste has been removed from the <br /> surface impoundment and that nondetectable to low levels of contaminants are <br /> now present directly beneath the former surface impoundment. No mention of <br /> the possible impact from the leach line from the body shop on the organic <br /> levels detected was addressed in the HAR. <br />