ARCHIVED REPORTS XR0001410 - Laserfiche WebLink

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r Page 3 Mr Michael Infurna Jr June 2, 1998 i UST Removal Soil Sample Results Sail Sample Analytical Results ' (Reported As Milligrams Per Kilogram) Sample Benzene Toluene Ethylbenzene Xylenes TPH-G STK-IN 42 37 38 710 4,600 ' STK-1 E <0 005 0 006 <0 005 0 007 < 1 0 STK-1S 35 450 240 1,600 9,600 STK-IW <0 005 <0 005 <0 005 0 007 < 1 0 STK-PPI <0 005 <0 005 <0 005 <0 005 < 10 STK-PP2 <0 005 <0 005 <0 005 <0 005 < 10 Based on these sample results, Mr Michael Infurna with San Joaquin County requested ' that a subsurface investigation be performed to assess potential petroleum hydrocarbon impact to soil and groundwater beneath the former UST Furthermore, Mr Infurna requested that the remaining product piping be exposed to assess whether it had been properly abandoned-in-place Product Piping Abandonment On April 17, 1998, an approximately 3 foot by 4 foot area, adjacent to the south end of the site building's garage door, was saw-cut and excavated to expose one end of the remaining 1 5-inch diameter product piping A similar saw-cut and shallow excavation was made around the former fuel dispenser within the building However, this end of fthe piping near the dispenser could not be located The exposed piping, which was situated beneath the base of the 9-inch concrete pad, held a threaded end-cap Following the cap's removal, it was observed that the piping was empty and had not been previously abandoned-in-place with cement grout IWith Mr Infurna observing, a technician from Advanced GeoEnvironmental of Stockton(Philip's local subcontractor) poured approximately 3 to 5 gallons of neat cement into the product piping This volume of cement is the equivalent volume of about 30 to 3 5 feet of the piping, indicating that it was filled throughout its entirety Approximately 20 pounds per square inch of pressure was applied to the end of the piping for 5 minutes Mr Infurna indicated that the piping was successfully abandoned-