SITE INFORMATION AND CORRESPONDENCE

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Mr. Michael Walker December 23, 1992 Page Two measured as TPH (oil and grease) , is of low mobility. The areas of contamination are limited to on-site soils and the shallow aquifer based on soil and ground water samples. Contaminants have not been detected in off-site monitoring wells. The report further concluded that visibly impacted soils are most apparent near the center of the eastern parcel. This concurs with historical information of the location of the six 50, 000 gallon storage tanks. Based on the extensive soil and ground water sampling completed at the site, the source of the contamination is determined to be a result of leakage from crude oil storage in tanks without contained bottoms. Over time these tanks leaked into the underlying soils and the shallow aquifer beneath the site. Free-product was observed in several test pits and in two on-site wells. Other site activity involved the grading of stockpiled soil on site to reduce the overall height to approximately five feet or below the existing chain link security fence that surrounds the perimeter of the site. The Board and the Department met on September 21, 1992 , to discuss past and future activities relating to ground water issues at the Renown site. Based on the discussion with the Board, the following recommendations were outlined. It may be unreasonable to require source removal of the hydrocarbon contaminated soil to the cleanup standard of 50 ppm. The removal of surface soils up to ten feet may be necessary to minimize direct contact depending on future land use activities. The Board will require annual ground water monitoring for a minimum of five years. If the land is to be used as a park or open space, watering in limited quantities is recommended to reduce the probability of additional contaminants from leaching. The Board concurs with the Department that the contamination in the shallow aquifer can be addressed in the future as part of a regional ground water issue. Any future land use will require a deed restriction if residual contamination is to remain on-site. Additional site remediation is necessary to use the land for a proposed park or playing field. The soil cleanup criteria should be evaluated by the Department. The Department discussed with you the -possibility of remediating the surface soil to a level which would allow the fence now enclosing the site to be removed. Until the site is remediated, the fence and posting must remain. Further discussion--and resolution of this issue is necessary. The site is listed in the Department's CalSites tracking system as requiring further action; however, the Department is not scheduled to oversee future remedial activities.