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N"ED Sr"F. <br /> J � 5 <br /> UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br /> REGION IX <br /> 75 Hawthorne Street <br /> San Francisco, Ca. 94105-3901 ECEiV <br /> August 26, 1992 AN 3 1 1992 <br /> Marshall Cloud <br /> Environmental Protection Office ENVIRON MENTAL HEALTH <br /> Bldg. 231, Tracy Location P[RM1T/ 0vIG€w <br /> Defense Distribution Region West <br /> P.O. Box 960001 <br /> Stockton, CA 95296-2050 <br /> RE: EPA Comments on DDRW-Tracy's Draft Engineering Report for <br /> Well Evaluation and Abandonment (July-92) <br /> Dear Marshall , <br /> Attached are EPA's comments on the above referenced <br /> document, received in our offices on July 27 , 1992 . Per the <br /> terms of the FFA, EPA is providing comments within 30 days. <br /> The results of analyses for organochlorine pesticides on <br /> samples of groundwater from Well 1 showed levels of DDD, and DDE <br /> above the EPA suggested action level of 0. 1 gg/L. Dieldrin was <br /> also detected in these samples and although a Maximum Contaminant <br /> Level (MCL) has not been established for this pesticide, the 10-6 <br /> risk level for Dieldrin is defined as 0. 002 µg/L. These <br /> groundwater samples were retrieved at a depth below 515 feet, <br /> which could indicate that a pesticide plume exists within the <br /> Lower Tulare. These issues of possible contamination of the <br /> Lower Tulare Formation need to be examined and addressed in the <br /> Comprehensive RI/FS. <br /> Several important issues which were mentioned in the <br /> laboratory' s Summary in Appendix D are not covered within the <br /> text of this document (see attached comments) . <br /> Should you have any questions, please contact me at (415) <br /> 744-2392 . <br /> Sincerely, <br /> l <br /> Michael Work <br /> Federal Facilities Enforcement Branch <br /> Office of Superfund (H-9-1) <br /> Attachment <br /> cc: (See Distribution List) <br /> Prune„ Rencled Paper <br />