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I kq KLEINFELDER 1 EXECUTIVE SUMMARY 1 ' This is a report of Kleinfelder's Limited Phase II Assessment conducted within the Weber Point South Seawall at 221 North Center Street (portion of) in Stockton, California which is proposed for I ' redevelopment Mr Tony Lopes of Siegfried Engineering, Inc, retained Kleinfelder to conduct the assessment in accordance with our proposal (File No 20-1129-30) dated November 18, 1996 The assessment was performed as follow-up services in response to recommendations detailed in Kleinfelder's report titled "Phase I Environmental Site Assessment, Weber Point South Seawall, ' 221 North Center Street, Stockton, California" report dated July 14, 1997 (Kleinfelder File No 20- 1129-30 GO 1) and in anticipation of planned seawall improvements 1 Kleinfelder conducted this limited assessment of the site to evaluate the presence of selected contaminants which may be associated with an adjacent ARCO retail service station and ' documented regional sources of groundwater contamination which have the potential to impact the site Soil samples were collected at 5 foot intervals from 3 soil borings The borings were advanced to groundwater and Hydropunch IIT"' water samples were collected An additional surface water sample was also collected from the Stockton Deep Water channel for background references Unidentified Extractable Hydrocarbons (340 pg/L ) in the carbon range C10 to C30 was detected above laboratory reporting limits in the groundwater sample collected from boring HP-3 In ' addition, Unidentified Extractable Hydrocarbon (450 µg/L ) in the carbon range C13-C40 was detected above laboratory limits in the channel water sample Acid/Base Neutral 0i40anic constituents (Bis(2-ethylhexyl)phthalate (2100 dig/L ) sand Butyl benzyl phthalate (40 µg/L ) wei e detected in boring HP-I Butyl benzyl phthalate (29 µg/L ) was detected in boring HP-2 1 Based on the data obtained during our assessment, the following conclusions and recommendations have been formulated ' 1 Kleinfelder does not recommend an further investigation or clean-up for the site Y g 1? However Kleinfelder recommends that a copy of this report be submitted to the ' RWQCB and PHS/EHD for their review and comment ' 2 The drilling returns (soil) should be properly disposed of by the Client Kleinfelder can assist the Client in that disposal at an additional charge if requested by the client ' 3 If discoloied soil odors, os other evidence of contamination are encountered during site grading, development etc oui office should be notified immediately 20-1129-30/2117EZ 114 Page I of 13 0 1997 KIL01fdki IM July 14 1997