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07/12/08 13:45 00916 372_0911 FILLNER CDNSTHU(c 20 CLOSURE PROCEDURE-!REMOVAL OF TANKS SAN JOAQUIN COUNTYiDEPARTMENT OF ENVIRONMENTAL HEALTH TANK CLOSURE GUIDELINES AND SOIL OND GROUNDWATER SAMPLING GUIDELINES SHALL BE � FOLLOWED,EXCEPT MERE THE FOLLOWING SPECIFICATIONS ARE MORE RESTRICTIVE. REMOVE ALL PRODUCT FROM TANKS. REMOVE ALL RESIDUAL LIQUID,SOLIDS;OR SLUDGES. I PURGE ALL VAPORS FROM GAS TANKS WITH A MINIMUM OF THIRTY(30)POUNDS OF SOLID CARBON DLOX16E'(DRY ICE) FOR EACH 1,000 GALLONS OF TALK CAPACITY. FOR t DIESEL,A MINIUM OF 45LBS SOLID CARBON DIOXIDE(DRY ICE)PER 1000 GAL OF TANK CAPACITY AND PRESENT'SALES SLIPS TO INSPECTOR. PELLETIZED DRY ICE IS RECOMMENDED.CAP ALL OPENINGS EXCEPT VENT PIPE AND ALLOW TWO HOUR ' MINIMUM AND SIX HOUR'MAXMMUM FOR OXYGEN DISPLACEMENT AFTER PUTTING CARBON DIOXIDE INTO THE TANKS. VENT PIPE OPENING TO BE CHECKED WITH A COMBUSTIBLE GAS DETECTOR TO DETERMINE IF TANK 15 VAPOR FREE OR IF ADDITIONAL DRY ICE ANDIOR TIME MAY BE REQUIRED. PLUG OR CAP ALL TANK OPENINGS LEAVING A 118"»114"PRESSURE RELIEF HOLE IN ONE CAP ATTHE TOP OF THE TANK VISUALLY INSPECT THE TANKS UPONREMOVALALL EXTERNAL TANK SURFACES AND FITTINGS SHALL BE INSPECTED FOR EVIDENCE OF HOLES OR LEAKAGE. THE RESULTS OF SUCH INSPECTION SHALL BE DOCUMENTED IN WRITING,WITH PHOTOGRAPHS WHERE APPROPRIATE. PATCH ANY HOLES WITH APPROVED MATERIAL BEFORE TRANSPORT NG TANKS TO DISPOSAL SITE. SOIL SAMPUNG SHALL SE CONDUCTED IN ACCORDANCE WITH THE LUFT MANUAL. i TWO SOIL SAMPLES SHALL BE ANALYZED FROM BENEATH EACH TANK- ONE FROM i DIRECTLY BENEATH THE FILL PIPE THE OTHER FROM A SIMILAR POSITION AT THE OPPOSITE END OF THE TANK. IF OBVIOUSLY STAINED OR CONTAMINATED AREAS EXIST IN LOCA71ONS OTHER THAN THE ABOVE LOCATIONS,and THEN ADDITIONAL SOIL SAMPLES SHALL BE ANALYZED FROM THESE OBVIOUSLY STAINED OR CONTAMINATED AREAS. . S SOIL SAMPLES SHALL BE COLLECTED FROM THE NATIVE SOIL AT OR JUST BELOW THE INTERFACE OF TIJ SACKFI L WITH THE NATIVE SOIL SAMPLES SHALL 13E TAKEN USING A DRIVEN TUBE TYPE SAMPLER, CAPPED AND SEALED WITH INERT MATERIALS. FORMAL,SIGNED CHAIN-OF-CUSTODY RECORDS SMALL BE MAINTAINED FOR EACH SAMPLE AND SUBMITTED WITH THE RESULTS TO THE REGULATING AGENCY. i IF THE BOTTOM OF THE TANK IS BELOW THE GROUNDWATER TABLE,THEN SOIL SAMPLES ARE NOT REQUIRED. IN THIS CASE,A WATER SAMPLE SHALL BE COLLECTED AS SOON AS POSSIBLE FROM THE SURFACE OF THE GROUNDWATER IN THE EXCAVATION, A CHECK'SHALL INITIALLY Be MADE FOR ANY FREE=FLOATING PRODUCTS. IF NO FLOATING PRODUCT IS DETECTED,THEN A WATER SAMPLE SHALL BE TAKEN WITH A DEVICE DESIGNED TO DEDUCE THE LOSS OF VOLATILE COMPONENTS. A BAILER IS A SUITABLE SAMPLING DEVICE. THE WATER SAMPLE i SHALL BE IMMEDIATELY POURED INTO A VOLATILE ORbANIC ANALYSIS(VOA)VIAL WITH AS LITTLE AGITATION AS POSSIBLE A TEFLON SEPTUM SHALL BE USED TO SEAL i THIS VIAL_ SOIL AND WATER SAMPLES SHALL BE ANALYZED FOR TOTAL HYDROCAR13ONS BY THE METHODS OUTLINED IN AGUIDEL.INeS FOR ADDRESSING FUEL LEAKS- 2 I I