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03/24/2000 15:03 FAX 530243165 CH2M HILL 0002/004 <br /> Sent By: BWGCB; 2553015; Feb-2* 4:06PM; Page 214 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Steven r.Butler,Chair Gray Davis <br /> Wingtw H,tnrRox <br /> S,xMf�yfor Sacrawmro Mata l)Inee Governor <br /> linvirorsmeata( InWncl Address: he,polwa J. b.ca(pv/—rwgrh5 <br /> v.»randnn 3441 Rn tim Rnsd..SYhe A.9vcranxnto,CIhfnade 95927-3003 <br /> Phwn (n16)155-3000 1}Ax(9161255-3015 <br /> 24.February 2000 <br /> Ms, Miriam L. Barhoaio <br /> Chevron Chemical Company LLC <br /> P. O. Box 6047 <br /> San Ramon,CA 94583-0947 <br /> CONDITIONAL APPROVAL OFREMEDIAL ACTION PLAN, KOPPEL STOCKTON <br /> TERMINAL,SAN JOAQUiN COUNTY <br /> I received the February 2000 Remedial Action Plan(RAP)prepared by C142M Hill for the Koppel <br /> Stockton Terminal. The RAP satisfactorily addresses the remediation strategy for the nitrate and <br /> ammonia products in soil and groundwater for all areas identified for rcmcdiation in the Draft <br /> Feasibility Study. <br /> I also received the February 2000 Final Feasibility Study R'epon(FS)prepared by C92-M Hill. This <br /> document incorporates all of my comments on the Draft FS, and I will respond to this document under <br /> separate cover. <br /> The groundwater monitoring data from both Cal Farm Supply monitoring wells and Koppel monitoring <br /> wells indicate a peculiar groundwater depression on the north side of the Koppel site in spite of water <br /> ponding in this area for sigaficant periods of the wet season, The measured groundwater elevation could <br /> be different than the actual elevation if one of the flush mount monitoring well casings had bean driven <br /> over with heavy equipment during a wet period, Therefore,please resurvey monitoring wells KP-2 and <br /> IT.P-3 before the second quarter monitoring event. i have also requested that Cal Farm.Supply resurvey <br /> its monitoring wells. <br /> The RAP describes the phytoremediation implementation plan for the Koppel Stockton facility including <br /> planting,irrigation, and sampling details, A contractor will provide regalar maintenance of the trees <br /> Lind irripatinn syitrm- and CH2TYT Hill Will lnsrall twanew Piezometers. <br /> Rcmediapon of the area immediately Mjaftnt to the warehouse is not included in this RAP, and will be <br /> addressed in future correspondence. <br /> California Environmental Protection Agency <br /> Q R401410dPWr - <br />