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s — y�3�'y, 2 ,"'N 'Ess'%mi" .. a. _ r�.�..-...,i�.^.:�rx��.....w,...r�».. �.».x:. —....«�..._.�.e...�.. — s 3 OEM =11 DEPTH TO GROUNDWATER: No records of any wells in the immediate vicinity were found, but the Pall 1989 edition of the San Joaquin Co. Flood Control and Water Conservation District Map, (Plate IV,) shows that the depth to the water table is about tS•, or 23• below ground surface. Water depths in monitoring wells to the north of the property were in close agreement with this map. No water or significant moisture was encountered during excavation. LOCATION OF MUNICAL. & MONITORING WELLS: The latest information available to 'the writer shows ' that the nearest municipal water wells are approximately 1/2 mile to the north and 1/2 mile to the southeast. The nearest monitoring well is about 8/10th& of a mile to the northwest an or near Moffat Blvd. Refer to Plate JCI for more detail. PRIOR HISTORY OF SITE: The Liffice adjacent to the UST location is currently vacant, but had been occupied by a Pony Express Courier service; the tank was used to service the fleet of vehicles used by the company. There are no records available concerning fuel usage or amount of spillage, if any. On-August.;<24, 1989, Jim Thorpe 'Oil, `Inc. removsd,one` ' (1) ::l,o0o gallon -underground:'storage " tank which had ronteined unleaded;., garolxne._ A slight gasoline odor was noted during tank removal, but no` soil discoloration or other evidence of leakage was evident in the spoil removed or the excavation. The tank and piping were in9 ood condition. The tank was triple--rinsed and MiR R disposed of propperly, (refer to Exhibit"B".) Two. (2); soil samples were tpken.b nie Environmental '.beneatii the' tank cradleo"-'at depthe'.of:'.8• at he"'nc�rth end ;'and 10'":at: the sdUth "end. Refer to Plate VII for locations of. the two samples. The results of the laboratory analyses showed detectable amounts of Xylene and TVPH,, refer to Table 1 for details. At the conclusion of this work, the excavation was approximately 14' long X 8' wide X 6' deep. The removed spoil, about 25 cubic yards, was placed on Plastic in an empty storage yard adjacent to the excavation, _ (refer to Plate VI.) On April 26, 1990, Jim Thorpe ail, Inc. ,ubmitted a soil re-exca- vation/resample workplan (refer to Exhibit "C",) to enlarge the existimg 'excavation' "to"approximately .:22 X ::, 14'. X 17' deep, - -.-- --__removing_an _ addi.tional--189:-cubic-- Yart#s::-af, spoil. - -Soil-samples - - -- were proposed to be taken as shown on Plates VIII & 19. In addition, 2 composite samples were to be taken from the excavated spoil to assist in future soil remediation. REVIEW OF' LATEST WORK PERFORMED; On August. 7, :1990; Jim Thorpe Oil, Inc. moved in equipment and began removing soil from the existing excay.:tion. The sediments L:onsisted of very fine to fine sand, tan t ► brownish-tan,. very 2