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CASE CLOSURE SUMMARY <br />Leaking Underground Fuel Tank Program <br />1. Agency Information <br />Agency Name <br />California Regional Water Quality Control Board <br />Santa Ana Region <br />Staff <br />Carl A. Bernhardt <br />Address <br />3737 Main St. Suite 500 <br />Title <br />Engineering Geologist <br />City/State) Zip <br />Riverside CA 92501-3348 <br />Phone <br />(951) 782-4495, Main* 782-4130 <br />II. Case Information <br />Site Name <br />Ricoh Electronics, Inc. <br />Location <br />2320 Redhill Avenue, Santa Ana <br />Regional Board Case # <br />083000552T <br />Local Agency Case # <br />Responsible Parties <br />Address <br />Phone Number <br />Ricoh Electronics <br />Contact: Mr. Jeff Simko <br />1100Valencia Avenue <br />Tustin, CA 92780 <br />Tank No. <br />Size in Gallons <br />Contents <br />Closed in place) <br />Removed <br />Date <br />1 <br />30,000 <br />Isoparaffin aliphatic hydrocarbons <br />Removed <br />September 1998 <br />2 <br />50,000 <br />Isoparaffrn aliphatic hydrocarbons <br />Removed <br />July 1998 <br />3 <br />50,000 <br />Isoparaffin aliphatic hydrocarbons <br />Removed <br />September 1998 <br />5 <br />40,000 <br />Isoparaffin aliphatic hydrocarbons <br />Removed <br />October 2005 <br />III. Release and Site Characterization Information <br />Cause and type of release: <br />Unknown <br />Site characterization <br />Moderate to low concentration of <br />Date approved by agency <br />complete? <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 />Monitoring wells <br />Yes <br />Number <br />I <br />11 <br />Proper screen <br />I <br />Yes <br />installed? <br />interval? <br />Deepest GW depth <br />13 feet <br />Shallowest GW depth <br />5.67 feet <br />Groundwater, most sensitive current use: Municipal <br />Are drinking water wells affected? <br />No <br />Aquifer name <br />Orange County Groundwater Management Zone <br />Is surface water affected? <br />No <br />Nearest SW name <br />San Diego Creek <br />Off -site beneficial use Impacts (addressestlocations): None <br />Report(s) on file? <br />Yes <br />Where islare report(s) filed? <br />SARWQCB, 3737 Main Street, Suite 500 <br />Riverside, CA 92501 <br />75C-102 <br />