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r REC Ep <br /> Euaunu G.Bquwry x. <br /> -,I, o.enxo J <br /> eA.E.nnn„ MAR 6i5 2014 -a M..TrxR.r— as <br /> Water Boards °u a°ew.M ^1 ugRar°Crleu <br /> — -- — ,N <br /> - ENvtRONMEt�r�Hers <br /> ZV Central Valley Regional Water Quality Control Board PERMITISERVIC <br /> Joe Herrud 4 March 2014 <br /> Technical Services Director, Environmental Operations <br /> Leprino Foods <br /> 1830 West 38`h Avenue <br /> Denver, CO 80211 <br /> REQUEST FOR ENVIRONMENTAL SAMPLING POSTPONEMENT AND CASE CLOSURE, <br /> LEPR/NO FOODS COMPANY, 2401 MACARTHUR DRIVE, TRACY, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board —Central Valley Region (Central Valley Water <br /> Board) staff reviewed the following: <br /> • 27 January 2014 Request for Environmental Sampling Postponement(Letter) <br /> • 18 February 2014 Addendum to Request for Environmental Sampling Postponement <br /> (Addendum) <br /> Brendan Shine, P.E. prepared the documents on behalf of Leprino Foods Company (Leprino). <br /> Since 1974 Leprino has owned and operated a cheese manufacturing and distribution facility at <br /> 2401 MacArthur Drive in Tracy (Site). In 1992, Leprino employees noticed diesel fuel around <br /> the containment area for an aboveground diesel storage tank. Subsequent investigations <br /> revealed that diesel fuel had been released to the soil and groundwater. <br /> On 24 September 2013, Leprino submitted a request for Site closure. Central Valley Water <br /> Board staff reviewed the request for closure and on 4 December 2014 Board staff sent Leprino <br /> a letter stating that the request for closure was denied and that Leprino would be required to <br /> submit additional information for us to consider the closure request (Board Staff Letter). Board <br /> staff requested Leprino prepare an estimate of when Site groundwater would reach water <br /> quality objectives (WQOs); evaluate the threat to groundwater from the remaining soil <br /> concentrations; and collect groundwater samples from all Site wells (including those that had <br /> not previously been sampled) and submit quarterly monitoring reports. <br /> The Addendum responds to the Board Staff Letter and includes the information below: <br /> • Leprino has met the requirements required in the Board letter and again requests Site <br /> closure. <br /> • The release of petroleum hydrocarbons was from a 10,000-gallon aboveground storage <br /> tank (AGT) and is analogous to an underground storage tank release. The AGT has since <br /> been removed from the Site. <br /> • Leprino has removed approximately 500 cubic yards of impacted soil from the Site. <br /> • The source area is completely paved and/or covered by structures; which limits any <br /> percolation or leaching through impacted soils. Leprino states that groundwater <br /> concentrations downgradient from 2011 maximum soil sample concentration locations <br /> KARL E. L.ONCLEY SOD, P.E., CIIAIR I PAMELA C. CREEOON P.E., BCEE, EXECUTIVE orrom <br /> 11026 Sun Center Drive#209,Rancho Cordova,CA 95676 1 wvrw.weterboarde.ca.gov/centraiveliey <br /> Lj gECYGIEO PPPEq <br />