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;f y <br /> August 27, 1996 <br /> Page 3 <br /> removal of all known or suspected tanks,product piping, and debris will be obtained by <br /> Chevron's contractor prior to the start of any work. <br /> The specific scope of work is discussed below: <br /> Waste Oil Tank and Sump Removal. One waste oil tank and one <br /> waste oil and grease sump will be removed by a Chevron approved <br /> contractor. Prior to removal,the waste oil tank and sump will be <br /> triple rinsed by Erickson, Inc. Upon removal ,the waste oil UST will <br /> be hauled by Erickson, Inc. for disposal at their Richmond facility. If <br /> soil in the waste oil tank or sump area is found to be impacted by <br /> petroleum hydrocarbons, some limited over-excavation may be <br /> performed. During upcoming activities, PACIFIC will be onsite to <br /> observe waste oil tank and sump removal activities. When existing <br /> facilities are removed from the site,a PACIFIC representative will <br /> collect soil samples from beneath the facilities in accordance with <br /> San Joaquin County Public Health Department/Environmental <br /> Health Division(SJCPHD)requirements. The samples will be <br /> submitted under chain-of-custody to a California State-certified <br /> analytical laboratoryfor analysis as described below. Additionally, <br /> the soil samples will be qualitatively evaluated in the field using a <br /> photo-ionization detector(PID). Upon receipt of sample results, <br /> PACIFIC will prepare a letter report summarizing removal activities <br /> and sampling results. <br /> • Associated Product Piping Removal. According to the geophysical <br /> report issued by NORCAL, no product lines were discovered. . <br /> However,PACIFIC field staff will assess if any product lines still <br /> exist during the excavation of the waste oil tank,the former UST pit, <br /> and the locations of the anomalies identified'at the site by NORCAL. <br /> If any product lines are encountered,the lines will be excavated and <br /> removed, and the native soil beneath these lines will be sampled <br /> every 20 lineal feet. Upon removal, any product lines will be hauled <br /> by Erickson, Inc. for disposal at their Richmond facility. If soil in <br /> the vicinity of any of the excavations is found to be impacted by <br /> petroleum hydrocarbons, some limited over-excavation may be <br /> performed. <br /> • Former UST Pit Debris Excavation and Removal. PACIFIC will <br /> oversee the removal of the backfill in the former gasoline UST pit. <br /> Care will be taken to segregate concrete debris from the backfill soil. <br /> Debris will be hauled offsite to an appropriate landfill. Soil from the <br /> former gasoline UST complex will be aerated onsite and used as <br /> backfill for the excavation. This soil will be stockpiled separately <br /> 9200391 AfWPLAN <br />