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1 <br /> LEAK OR SPILL INFORMATION <br /> The owner reported that occasional small spills and <br /> ' overfilling of trucks and diesel tanks occurred at the site. No <br /> inventory reconciliation was kept on the tanks. The tanks were <br /> ' emplaced in 1957 and were used regularly until 1990. <br /> The gas tank has not been used in several years and was kept <br /> empty according to Les Calkins. <br /> TANK AND PIPING LAYOUT <br /> All tanks and piping is removed from the site and manifested <br /> ' to Turlock . Manifests are not available at this time. <br /> SITE TOPOGRAPHY, GEOLOGY AND HYDROLOGY <br /> ' The site is flat with relief over the entire site less than <br /> The site is underlain by Quaternary alluvial flood basin <br /> sequences of sand , sandy clay and gravel of the San Joaquin <br /> Valley. <br /> Geologic examination of the tank pit shows an 8 foot bank of <br /> sandy clay and silty sand (USCS = SC-SM) . <br /> PROPOSED SAMPLING PROCEDURES AND EQUIPMENT <br /> Completion of 4 soil borings at the tank pit are proposed . <br /> One boring will be made at the south end of the tank pit . Two <br /> borings at the northwest and northeast corners of the pit and one <br /> ' soil boring in the middle of the tank pit . <br /> Boring and sampling will be done with an Ingersoll Rand A- <br /> 200 t re inch hollow stem auger drill and a split spoon sampler <br /> ' with three six inch brass tube liners. The middle tube in the <br /> split spoon will be used for analysis unless a duplicate is <br /> required at the sample interval . Duplicate sampling is discussed ��a � <br /> ' under Quality Control below. Samples will be taken beginning at <br /> 10 feet and at five feet intervals thereafter and when a change // <br /> in soil type i5 encountered which could affect hydrologic ele <br /> conductivity. Samples will be taken to 25 feet in depth . All .� <br /> ' samples will be tested at the time the split spoon is opened with / <br /> the Organic Vapor Analyzer . If the bottom sample (25 foot sample) 3 <br /> shows in excess of .5 ppm increase over ambient organic vapor <br /> ' level the borings will be directly continued to ten feet below <br /> the water table and converted to monitor wells ( approximately 45 <br /> feet ) . <br /> ' The soil borings will be backfilled with a 7 sack sand <br /> cement upon abandonment . <br /> fc d <br /> _ Gcyu <br /> 3 <br /> I <br /> T & T EARTH SERVICES <br />