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Mr. Robert Mihalovic • - 3 - • 27 September 2004 <br /> annual sampling, Koppel should conduct the annual event in the third quarter, and the corresponding <br /> Annual Report will be due by 1 November. <br /> A review of the monitoring well network suggests that monitoring wells KP-7S and KP-7D are <br /> redundant for water quality data at this time, since they contain low concentrations of nitrogen and other <br /> monitoring wells are in close proximity. These wells should,however, continue to be monitored for <br /> groundwater elevations. <br /> These changes are incorporated into the draft Monitoring and Reporting Program which is attached for <br /> your review and comment. Please provide your comments by 29 October 2004. <br /> Summary <br /> Koppel's commitment to maintaining a viable phytoremediation project is commendable. The <br /> groundwater monitoring data show that phytoremediation is lowering nitrate-N concentrations from <br /> 1,000 mg/l in the test grove in 1999 to about 400 mg/l in the spring of 2004, and in other areas from <br /> about 200 mg/1 to about 50 mg/l. The most striking evidence that it is the trees that are removing the <br /> nitrogen is the increases seen in nitrate in groundwater corresponding with large losses in the tree <br /> population. <br /> By 29 October 2004, please provide the following: <br /> • A schedule to provide a cleanup plan for soil west of the warehouse; <br /> • Comments on the draft Monitoring and Reporting Program. <br /> By 1 December 2004,provide a work plan and schedule to install a monitoring well north of the Koppel <br /> site. <br /> If you have any questions, you may contact me by phone at (916) 464-4680, by email at <br /> terrela@r.swrcb.ca.gov or by regular mail at the address on the letterhead. <br /> Y <br /> AMY TERRELL <br /> Private Sites Cleanup Unit <br /> Enclosures (2) <br /> cc: Mr. Michael Infuma, San Joaquin County Public Health Services, Stockton . <br /> Mr. Sheldon Nelson, ChevronTexaco ETC, San Ramon <br /> Mr. Kirk O'Reilly, Chevron Research and Technology Division, Richmond <br /> Mr. Dan Munzer, Munco Inc., Long Beach <br /> Mr. Ken Laconde, SCS Engineers, Long Beach <br /> Mr. Ozzie Morris, Cargill Fertilizer Inc., Riverview, FL <br /> Ms. Karen Baril, Cargill Fertilizer Inc., Minneapolis, MN <br /> Mr. Greg Jason, Cargill Inc., Wayzata, MN <br /> Mr. Karl Morthole, Morthole and Zeppetello, San Francisco <br /> Ms. Leah Goldberg, Hanson Bridgett, San Francisco <br /> Ms. Rita Koehnes, Port of Stockton, Stockton <br /> Mr. Mick Hardin,Burlinginton Northern Santa Fe Railroad, San Bernardino <br /> Ms. Alexa Stamets, CH2M Hill, Oakland <br /> Mr. Gerald Vogt, CH2M Hill, Redding <br />