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STATE OF CC41FORNIA - Environmental Proteo Agency • PETE WILSON Governor CALIFORNIA REGIONAL WATER QUALM CONTROL BOARD �� CENTRAL VALLEY REGION ENVIRONMENTAL HEALTH —_ Sacramento, Rento, Road, Suite A PERMIT SERVICE, w ) Sacramento, CA 95827-3098 PHONE: (916) 255-3000 r� y r� FAX: (S 16) 255-3015 �1 74 DEC — I PM 1: G6 28 November 1994 Mr. John Melling Nestle Beverage Company 230 Industrial Avenue Ripon, CA 95366 ABOVEGROUND STORAGE TANK REMEDIATION CLOSURE, NESTLE'S BEVERAGE COMPANY, STANISLAUS COUNTY On your behalf, VHF, Inc. submitted the 20 September 1994 Remedial Excavation Report on the investigation and remediation of diesel-contaminated soils at your facility in Ripon. The report transmitted results of additional soil sampling in the vicinity of tank TK-2. Prior to sampling, this area was excavated to an average depth of five feet below the ground surface (bgs). Six floor samples and three sidewall samples were taken to confirm that all contaminated soils have been removed. All confirmation sample results show nondetectable levels of benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons (TPH) as diesel, kerosene, and motor oil. The report also requested closure of investigation at the facility. The 16 June and 20 September 1994 reports stated that the site is underlain by a sandy, silty, clayey gravel to a depth of two feet, clayey-silty sand from 2.5 to six feet, sandy-silty clay from six to eight feet, and fine-grained sand from eight to 10 feet; ground water was not encountered during the excavation but is found at about 25 feet bgs; the site is.approximately 3,000 feet west of the Stanislaus River; contaminated soils were excavated to an average depth of five feet bgs and 12 bgs in one location; TPH as diesel was not detected in the confirmation samples; monitoring and extraction wells, which have been installed in conjunction with the trichloroethylene (TCE) contamination, have not been tested for fuel constituents; an onsite soil gas survey performed in 1989 also in conjunction with the TCE contamination showed nondetectable BTEX; approximately 750 tons of contaminated soils were excavated and disposed of at REMCO, Inc. in Richmond, California; and the excavation was backfilled with clean soil and compacted. Based on the information provided, Board staff has determined that appropriate response actions have been completed, that acceptable remedial practices were implemented and at this time, no further investigation, remedial or removal action or monitoring is required at the aboveground storage tank area at the Nestle Beverage Company in Ripon, San Joaquin County.