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CASE CLOSURE SUMMARY <br />Leaking Underground Fuel Tank Program <br />I A I normaf Ion. l~ency ~ <br />Agency Name California Regional Water Quality Control Board <br />Santa Ana Region <br />Staff Carl A. Bernhardt <br />Address 3737 Main St. Suite 500 Title Engineering Geologist <br />City/State/ Zip Riverside CA 92501-3348 Phone (951) 782-4495, Main # 782-4130 <br />II. Case Information <br />Site Name Ricoh Electronics, Inc. <br />Location 2320 Redhill Avenue, Santa Ana <br />Regional Board Case # I 083000552T II Local Agency Case # <br />Responsible Parties Address Phone Number <br />Ricoh Electronics <br />Contact: Mr. Jeff Simko <br />1100 Valencia Avenue <br />Tustin, CA 92780 <br />Tank No. Size in Gallons Contents Closed in place/ <br />Removed <br />Date <br />1 30,000 Isoparaffin aliphatic hydrocarbons Removed September 1998 <br />2 50,000 Isoparaffin aliphatic hydrocarbons Removed JUly 1998 <br />3 50,000 Isoparaffin aliphatic hydrocarbons Removed September 1998 <br />5 40,000 Isoparaffin aliphatic hydrocarbons Removed October 2006 <br />III. Release and Site Characterization Information <br />Cause and type of release: Unknown <br />Site characterization <br />complete? <br />Moderate to low concentration of <br />petroleum hydrocarbons were detected <br />in the soil and groundwater to the <br />south and southwest of the UST. The <br />affected soil and groundwater was not <br />defined to non-detect. <br />Date approved by agency <br />Monitoring wells <br />installed? <br />Yes Number 11 Proper screen <br />interval? <br />Yes <br />Deepest GW depth 13 feet Shallowest GW depth 5.67 feet <br />Groundwater, most sensitive current use: Municipal <br />Are drinking water wells affected? No Aquifer name Orange County Groundwater Management Zone <br />Is surface water affected? No Nearest SW name San Diego Creek <br />Off-site beneficial use Impacts (addressesllocations): None <br />Where is/are report(s) filed? Report(s) on file? Yes SARWQCB, 3737 Main Street, Suite 500 <br />Riverside, CA 92501