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_Sent y: mom; . <br /> 25530t5; <br /> Fe -24-00 4:06PM; <br /> Page 2/4 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> w1man H,lurkax Steven T.Batler,Chair <br /> Sa'/Ylary far <br /> a-�.(onmeruat sKrAul nto Mata Olnce Cray Davis <br /> profOrtlnrt <br /> 3843 Hhrkma.HaqRud.BaAdad.' x: 6aplhYww4wrtb.w.bav/�rwgch5 Gcir�nw <br /> lm A.S4"Vytllkl.C3tif`unia 95827-7003 <br /> Phcxx(9!6)25s-3000•FAX(916)255.3015 <br /> 24 February 2000 <br /> Ms.Miriam L. Barbonio <br /> Chevron Chemical Company LLC <br /> P. O. Box 6047 <br /> San Ramon,CA 94583-0947 <br /> CONDITIONAL APPROVAL OF Px'NEDL4L-`TION PLAN, KOPPEL STOCIfTON <br /> TERU NAA,SAN JOAQUnV COUNTY <br /> T received the February 2000 Remedial Action Plan(RAP)prepared by CH2M HiII for the Koppel <br /> Stockton Terminal. Tho RAP satisfactorily addresses the rcraaliation strategy for the nitrate and <br /> ammonia products in soil and groundwater for all areas identifiedEdi for strategy <br /> for <br /> in the nitrate <br /> Feasibility Study. <br /> I also received the February 2000 Final Feasibility Study Repo <br /> separate cover. <br /> document incorporates all of my comments on the Draft Fs, rt(FS)prepared by CH2M Hill. T <br /> and T will respond to this document under <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 ofwater <br /> ponding in this area for signficant periods of the wet season. The measured groundwater elevation could <br /> be different than the actual elevation ifone of the flush mount monitoringsur well casings had been driven <br /> over with heavy equipment during a wet period. Therefore,please resurvey monitoring wells KP-2 and <br /> its m before the second quarter monitoring event. i have also requested that Cal Farm Supply resurvcy <br /> its monitoring wells. <br /> The RAP describes the phytoremodiation implementation plan for the Koppel Stockton facility including <br /> planting,irrigation, and sampling details <br /> and ;*riBjtinn s}rvfnin_ and CN? . A contractor will provide regular maintenance of the trees <br /> 1M Hill Will install two now piezometers. <br /> Remediation of the area immediately adjacent to the warehouse is not included in.this RAP, <br /> addressed in future correspondence, and will be <br /> Califurnia EnvlronmentalProlection,fgency <br /> Roq,r(ed papr� . <br />