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i <br /> ` J <br /> kld <br /> Mr. James L.L. Barton <br /> December 10, 2003 <br /> Page 2 of 2 <br /> change of carbon in both units. Carbon Resources indicated a two-week scheduling lag existed. <br /> Carbon Resources notified Ground Zero the following week that the Speedy Mart site was <br /> scheduled for December 1, 2003. In the interim, upon notification of the breakthrough of C 1 on <br /> November 14, Ground Zero scheduled treatment system sampling for the next working day, <br /> November 17, 2003, on a quick turnaround. The treatment system was immediately shut down <br /> on November 18 upon verbal notification of MTBE detection in the effluent. <br /> 3. Breakthrough of two 2,000-pound GAC units occurred in less than 10 days. The proposed <br /> corrective action is to add a 200 pound canister (a S% increase in GAC). Regional Board staff <br /> believe that this is a completely inadequate responselsolution to the problem. <br /> The proposed 200-pound canister is not the sole response/solution to the problem. This small <br /> canister is considered a supplement to the lag 2000-pound GAC, as the criteria for replacing the <br /> carbon will remain-break-through-in-C1.-T-he-rapid-break through-of-the carbon_may.hav_e been <br /> due in part to initial start up of the treatment system, when excessive drawdown of the well <br /> likely resulted in some free product being pumped through the GAC unit(s). In addition, as <br /> stated in the November 24, 2003 faxed notification to your office, Ground Zero is evaluating air <br /> stripper systems that could be added to the treatment system. Ground Zero has also conducted a <br /> soil vapor extraction test and anticipates installing a vapor extraction system to remove free <br /> product from the water table around well MW L <br /> Ground Zero is currently preparing a more detailed report on the problem pursuant to your request. <br /> A weekly status report will be prepared, also pursuant to your request. <br /> Please contact John Lane at(209) 838-9888 if you have any questions regarding this submittal. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. <br /> John P. Lane <br /> CA Registered Geologist 6795 <br /> JLlcb <br /> Enclosures <br /> cc: Mr. Ray Baglietto/Mr. Frank Rauzi <br /> Mr. Jeff Wong, EHD <br /> U.S. Environmental Protection Agency, San Francisco <br /> California Dept. of Fish and Game,Rancho Cordova <br /> G:\CjROUNDZE\TULEBURG\Rcports\banon—NOV.doc <br />