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STATE OF CA),IFORNIA - Environmental Protea Agency � PETE WILSON Governor, <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD 'R <br /> CENTRAL VALLEY REGION °� <br /> Saar Routo, Woad, Suite A <br /> PHONE: (91 ) 2 5-300 3095 psavEj § \ <br /> 'rHOPIt: (916) 255-3000 IYh�\'IYYIC}.'(�"' a^p„m "�� <br /> FAX: (916) 255-3015 <br /> DEC 2 7 1994 21 December 1994 <br /> Mr. John Ewing <br /> Leprino Foods ENVIRONMENTAL MS HALTH <br /> P.O. Box 173400 <br /> ES <br /> Denver, Colorado 80217-3400 <br /> SUPPLEMENTAL GROUND WATER ASSESSMENT, LEPRINO FOODS, TRACY, SAN <br /> JOAQUIN COUNTY <br /> I have reviewed the 30 November 1994 report entitled Supplemental Ground Water Assessment <br /> submitted by Kleinfelder to meet the requirement of a Problem Assessment Report (PAR) for the <br /> Leprino Foods facility at 2401 MacArthur Drive in Tracy. The latest investigation activities <br /> discussed in the assessment report did not complete all of the work which we approved in the <br /> Revised Work Plan, and the assessment report did not address interim free product recovery as <br /> required in our 26 October 1994 letter. <br /> Instead of installing MW-11 offsite to the north of the Leprino property in the mobile home park, as <br /> proposed in the Revised Work Plan, lGeinfelder installed this well on the northern boundary of the <br /> Leprino property. The ground water sampled from this well had no detectable levels of petroleum <br /> hydrocarbons in the first monitoring event. However, the presence of 1,300 mg/l total petroleum <br /> hydrocarbons as diesel (TPHd) and 460 mg/1 TPHd in ground water samples from geoprobes GP9 <br /> and GP19, respectively, and the proximity of free product to MW-11 indicate that, in the future, <br /> hydrocarbons will be detected in MW-11. <br /> As we have stated many times in the last two years, the extent of both soil and ground water <br /> contamination must be determined to nondetectable levels. If petroleum hydrocarbons are detected <br /> in MW-11 or any other perimeter well in the future, additional monitoring wells must be installed. <br /> As I discussed with Mr. Tony Martin of Kleinfelder on 9 December 1994, our 26 October 1994 <br /> letter required that the PAR include an evaluation of free product recovery rate and free product <br /> volume and a proposal for a more intensive method of free product recovery. Since this was not <br /> included in the assessment report, Mr. Martin agreed to submit the evaluation of free product <br /> recovery rate and a proposal for interim free product removal by 16 December 1994. <br /> As required in the Cleanup and Abatement Order, the Final Remediation Plan is due 1 June 1995. <br /> Due to a reorganization in our office, Mr. Patrick Morris of our staff will oversee all Leprino Foods <br /> investigations and remediation. The senior in charge of that unit is Mr. Greg Vaughn. If you have <br /> any questions, please call Pat at (916) 255-3121. <br /> TOY POLLY'LOWRY <br /> Associate Engineering Geologist <br /> PAL:pal/lsb <br /> cc: San Joaquin Public Health Services, Stockton <br /> Mr. Roy Greengrass, Leprino Foods, Tracy <br /> Mr. Bruce Hilton, Kleinfelder, Sacramento <br />