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State•of California • . Department of Health Services Memorcaneii� �a ii To Tony Landis/ Dore February 18 , 1987 Jeanine Jones CSob : NCS U' Subject: Lika Corp. Site r^„ moll in Stockton Via Bill Quan vUV � EAU I i From Paul Hadley EAU li In a January 13 , 1987 letter to Allen Wolfenden, Tony Landis of NCS requested review of the Lika Corporation Site Investigation Report, and posed two questions to be addressed by Technical Services Unit. The first question dealt with cleanup levels (soil cleanup levels implied) , and the second question dealt with ground water. While the two questions are related, I am focusing on the soil issues and understapd that staff in the Geotechnical Assessment Unit are addressing ground water issues. My comments are based upon a review of the report prepared by Woodward-Clyde and a conversation with Marge Rouch, formerly the project lead for NCS. CURRENT PROPOSAL The current proposal from Lika Corp. and their consultants, Woodward-Clyde, is to remove metals contaminated soils to achieve background conditions. Background soil levels have been determined from a series of soil samples taken from near a well identified as upgradient from suspected sources of contamination. The removal of contaminated soils to achieve background conditions is acceptable. At issue is whether the reported levels are from an area that is upgradient and, if so, representative of background conditions. Also at issue is whether the extent of soil contamination :is confined to the areas currently slated for excavation (the 197 ' strip and the concrete sumps) , or whether some soil contamination is associated with other potential sources including drainage pipes. Determination of Background The identification of an "upgradient" well has been presented as an arguement for also determining a background condition for soils in the same area. Whether or not the "upgradient" well is truly representative of water flowing underneath the Lika Site from upgradient is an issue being addressed by Geotechnical Assessment Unit. i I;