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• s. <br /> I(NC0 R PO R <br /> P RE AEIAEERE D FNV1f'(if`,''° r:'! `,L Fi_,ALTH <br /> KEI-P92-0205.P2 <br /> May 13 , 1992 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> Attention: Mr. Keith Bullock <br /> RE: Work Plan/Proposal <br /> Unocal Bulk Plant #0950 <br /> 2835 Navy Drive <br /> Stockton, California <br /> BACKGROUND <br /> On April 22, 1992, Kaprealian Engineering, Inc. (KEI) collected <br /> soil samples following the removal of two underground diesel <br /> storage tanks (with individual capacities of 20, 000 and 10,000 <br /> gallons) at the referenced site. Ground water was encountered in <br /> the fuel tank pit at a depth of approximately 10. 5 feet below <br /> grade. Five soil samples (labeled SW1 through SW5) were collected <br /> from the fuel tank pit sidewalls at depths ranging from 9.5 to 10 <br /> feet below grade. Sample point locations are shown on the attached <br /> Site Plan. Ms. Pamela Violett of the San Joaquin County Public <br /> Health Services Department was present during tank removal and <br /> subsequent soil sampling. On April 29, 1992 , the tank pit had been <br /> completely excavated to a complete depth of about 11 feet below <br /> grade. A total of approximately 7, 000 gallons of ground water were <br /> pumped from the tank pit. KEI collected one water sample (labeled <br /> W-1) from the tank pit in the presence of Ms. Violett. All <br /> excavated soil was stockpiled on-site and sampled. <br /> All soil and water samples were analyzed by Sequoia Analytical <br /> Laboratory in Concord, California, and were accompanied by properly <br /> executed Chain of Custody documentation. All soil and water <br /> samples were analyzed for total petroleum hydrocarbons (TPH) as <br /> gasoline by EPA method 5030 in conjunction with modified 8015, <br /> benzene, toluene, xylenes, and ethylbenzene (BTX&E) by EPA method <br /> 8020, and TPH as diesel by EPA method 3550 (soil) and 3510 (water) <br /> in conjunction with modified 8015. <br /> Analytical results of the soil samples collected from the fuel tank <br /> pit indicated non-detectable levels of TPH as gasoline and non- <br /> detectable levels of BTX&E, except for 2 . 2 ppm of TPH as gasoline <br /> detected in sample SW2 and 0. 010 ppm of xylenes detected in sample <br /> SW4 . Analytical results of the soil samples collected from the <br /> fuel tank pit also indicated non-detectable levels of TPH as <br /> diesel, except for 120 ppm and 2 .7 ppm of TPH as diesel detected in <br /> 2401 Stanwell Drive,Suite 400 <br /> Concord,California 94520 <br /> Tel 510.602.5100 Fax 510.6870602 <br />