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~ • kn KLEINFELDER 6 May 1997. The Weston report illustrated specific information related to groundwater flow direction and UST excavated areas including sampling locations and cross sections of the former UST area. This information was used in part to develop monitoring well installation locations and soil and groundwater sampling and analyses in the former UST area. Also noted in the NOA report is a "No Further Action", letter addressed to Mr. Stroh of the SJC/MVCD from San Joaquin County Environmental Health Department I (SJC/EHD) stating completion of investigation and remedial activities related to former USTs at the site. This letter was dated April 7, 1998 and was located in the Appendix of NOA's report. The NOA ESA (Project No. LE02-510, dated January 10! 2003) included the following selected opinions, conclusions, and recommendations: s • "It is NOA's opinion that the subject property being on the various databases and county lists is due to the leaking underground storage tank case in which the file had been reviewed. The remediation of the aforementioned case did not remove all of the contamination from the soils beneath the subject property, and contamination may extend to the saturated zone. The case was closed; however, it was not a clean closure. It is NOA's opinion that the San Joaquin County Environmental Department could reopen the case when the land use changes or at any other time." "It is NOA's opinion that the application of herbicides, pesticides (DDT in particular) and larvicides on the subject property represents a threat of environmental degradation to the subject property" • "It is NOA's opinion that the contamination stemming from the LUST case located immediately adjacent and north of the subject property has migrated under the subject site property. The responsible party in the case has been identified. However, it is NOA's opinion that some contention as to the responsibility of the extent of the contamination might arise if the knowledge t of the amount of residual contamination on the subject property were made available. Further,the erratic groundwater flow direction may give some credence to third party claims should they arise." k "The existence of residual contamination from the leaking underground storage tank and remediation case on the subject property." oKleinfelder's scope of work was developed to address current conditions at the site relevant to both t onsite and offsite environmental concerns, including those concerns listed above by NOA. Please note however that Kleinfelder's scope of work was not developed with the intent to address all the concerns noted in the prior ESA. Kleinfelder's scope of work was developed to address I reported petroleum impacted soil and groundwater in the UST area; potential offsite sources of concern, including the northern, eastern and southern property boundaries; and to assess the current groundwater conditions, including groundwater depth, flow direction, and groundwater ! quality near the borders of the site and in proximity to the former USTs. Soil sampling and analyses related to a wash rack, storm drain, soil stockpile, chemical storage area and pond areas were conducted. The following is a summary of the conclusions and recommendations contained in Kleinfelder's Phase II report titled "Report, Phase II Environmental Site Assessment Update, Mosquito 42747.T03/ST04R882 - Page 2 of t July 2,20044 Copyright 2004,Kleinfelder, Inc.