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June 13, 1997 �W <br />' Page 4 <br /> C, 0 , D,+ <br /> wells (VW-1 through VW-3) screened in the 9- to 53-foot depth interval The system X00 <br /> was successful in removing remaining hydrocarbons in the vadose zone Approximately VS��S <br />' 2,745 pounds of total purgeable petroleum hydrocarbons (TPPH) and 12 pounds of x <br /> benzene were removed <br />' Current Site Status. SJCEHD has determined that the both soil and groundwater <br /> assessment has been completed and the plume appears stable (Attachment B) All <br /> potentially hydrocarbon-impacted soil has been either removed by excavation or reme- - <br /> diated through SVE No SPH has ever been detected in any monitoring wells The <br /> remaining dissolved-phase plume is concentrated in the eastern portion of the site Off- <br /> site migration is apparently limited to less than 100 feet (Figure C-5) <br /> In their letter dated January 9, 1997, SJCEHD requested additional information regard- <br /> ing the potential for natural attenuation of hydrocarbons Specifically <br /> • Data on the presence of hydrocarbon degrading bacteria, oxygen, or <br /> other available electron acceptors, nitrogen, phosphorous, potassium <br />' values, soil porosity, and organic carbon content <br /> • A survey of wells within 2,000 feet of the site and nearby pathways <br />' such as basements and utility line trenches <br /> • A feasibility study and corrective action plan <br /> • Continued quarterly monitoring <br /> In a letter dated February 7, 1997, Unocal responded that this site poses no threat to <br />' human health and safety or the environment and that further assessment and active <br /> corrective action was unwarranted (Attachment B) Unocal concluded that the site was <br /> suitable for closure as a low-nsk groundwater case In a letter dated March 3, 1997, <br /> ' SJCEHD denied Unocal's request for site closure (Attachment B) <br /> EVALUATION OF SITE FOR CLOSURE (1.G.) <br /> PACIFIC requests that the Fund Manager consider the following current site conditions <br /> ' when evaluating the site's eligibility for closure <br /> • Shallow impacted soil identified at the site has been remediated via <br /> excavation and soil vapor extraction Thus, soil potentially saturated <br /> ' with-petroleum in the immediate vicinity of the former source(s) has r <br /> apparent] been removed or remediated l_rA,, <br /> ' The health risk due to ingestion or dermal contact with soil affected by <br /> the discharge is reasonably abated, since the shallow hydrocarbon- <br /> impacted soil has been excavated <br /> 1 <br /> I100406A1CLSRE DOC <br />