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Riddle & Isola <br /> Attomeys at Law <br /> Patrick D. Riddle 7488 Shoreline Drive, Suite B-1 <br /> David R. Isola Stockton, California 95219 <br /> Michael L. F. Buck Telephone: (209) 952-6262 <br /> Kerry I. Zimmerman Facsimile: (209) 952-9891 <br /> April 12 , 1995 <br /> Mr. Mike Infurna 5 1 � <br /> San Joaquin County Public Health Services S Y�!I <br /> Environmental Health Division APR 1 `31995 <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> r-nlv!RONMENTAL HEALTH <br /> RE: Flag City Chevron, 6421 West Paddock Place RMIT/SERVICES <br /> Mr. Infurna: <br /> We have addressed your concerns regarding a potential source <br /> of contamination beneath the tanks. Per your request Ground Zero <br /> Analysis is conducting soil sampling of the additional soil <br /> generated during leveling of the tank cavity on the afternoon of <br /> April 11, 1995 and the morning of April 12, 1995. Ground Zero also <br /> collected soil samples from the bottom of the leveled tank cavity <br /> using a backhoe and submitted the samples for analysis. Ground <br /> Zero conducted the soil sampling in your presence per your request. <br /> Ground Zero's registered geologist was also present to conduct and <br /> supervise the sampling. <br /> Tri-regional guidelines for investigating leaking underground <br /> storage tanks state that soil samples should be collected from the <br /> sidewalls of the excavation, and if the pit is dry from beneath the <br /> tanks. If groundwater is encountered in the tank cavity the <br /> guidelines state that sidewall samples and water samples should be <br /> collected and analyzed. Very rarely are saturated soil samples <br /> analyzed because of the difficulty in determining the validity of <br /> the sampling results. The concerns you expressed about a possible <br /> source of contamination existing beneath the tanks were valid, <br /> however your suggested approach to investigate the matter is <br /> unconventional. Nonetheless, Ground Zero, in the interest of <br /> moving forward, is doing the suggested sampling, however we reserve <br /> our right to discuss the application and validity of the soil <br /> sample results and may need to schedule a meeting with you and your <br /> supervisor upon her return. <br /> 4 <br /> Scerel� <br /> Kerry Zimmerman <br />