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• TABLE 1 PREVIOUS SOIL AND GROUNDWATER SAMPLE RESULTS 1766 MONTE DIABLO AVENUE STOCKTON, CALIFORNIA }`V{„`O fi`lv,Vul •`ti ♦ }a,u, , {Qia J• a` `avv `tiJ0 ` t V,{,yy}r kk`.i.J v * {itµ �l`!`l\} I` S { a f l J 4 t r} }k JiJra a iLl`t v •• a}ri k 4 1 l xr 45�i t l tti J555} 3? kJ ' ,r,:{ll }iViJ4J`i1�3a}Vki}J��3SJ�iJMA[ �hl` ` "�J''"�'attit b'4o}k NJJo.�ik\vx4'.�v;`o.:k tv:S',}`}`iia}k1atiJ.a iay 4i43lti iiYJ tJti`vSv`yk�t�� tbt+a\yam . au J ,4'`'t`S`la 41illk S t rS t tar! 4f kuu rkk}1iJ It lJ\5? SOIL S-9 5-B1 34 0 13 0 035 063 14 NA S-15-B1 <1 0 040 0 013 0 006 0 023 NA S-20-B1 15 026 057 027 10 NA I Groundwater W-22-MW 1 200 31 11 1 9 52 NA i Laboratory analyses performed by Matrix Environmental Laboratories, Inc Laboratory results reported in mg/kg (parts per mullion) TPHg= Total Petroleum Hydrocarbons as gasoline TPHd= Total Petroleum Hydrocarbons as diesel fuel <1 =Less than the laboratory method detection limits . NA=Not Analyzed Jim Thorpe Oil of Stockton, California removed one 550-gallon waste oil, two 4,000-gallon unleaded gasoline, and two 8,000-gallon unleaded gasoline underground storage tanks, and product delivery lines on August 4, 1993 Three additional sand-filled tanks with smaller capacities were discovered and removed during the tank removal operation A total of six soil samples were collected from beneath the gasoline storage tanks at depths of 13 and 14 feet by Walsh& Associates, Inc under the direction of Ms Pamela Violett of San Joaquin County Environmental Health Division (SJCEHD), additionally, two soil samples were collected from beneath the waste oil tank and pipeline at depths of 7 and 2 feet, respectively (samples 7 and 8 on Figure 2) Because of the obvious presence and apparent extent of subsurface contamination, only two of the six soil samples(samples 1 and 6 on Figure 2) collected from beneath the gasoline storage tanks were analyzed for TPHg and BTEX Of these two samples, the sample with the higher concentration TPHg (sample 6 on Figure 2) was analyzed for soluble lead and ethylene dibromide (EDB) Laboratory analyses of the soil samples indicated that TPHg(70 ppm)was present beneath the 4,000- gallon tank formerly located at the northwest corner of the site, the laboratory analyses, however, i� indicated that the TPHg concentration in the sample collected from beneath the 8,000-gallon tank, formerly located at the southeast corner of the site, was less than the minimum detection limit (<1 ppm)of the laboratory method(Table 2) Benzene was not detected in either sample analyzed by the laboratory These results, however, are not likely representative of insitu contaminant concentrations • SEACOR 014-01-1 par 3