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i ADDENDUM TO MAY 25, 20001 ' REPORT OF CORRECTIVE ACTIONS AND RECOMMENDATION FOR SITE CLOSURE 151 South Main Street Manteca, California January 9, 2002 i1.0 INTRODUCTION ' This report is an addendum to the original"Report of Corrective Actions and Recommendation for Site Closure," dated May 25,2001 The purpose of this report,prepared by ATC Associates Inc (ATC)on behalf of Value Reclamation Corporation,is to present groundwater monitoring data in response to the letter directive of June 27, 2001 from the San Joaquin County Environmental Health Division(SJCEHD) requesting two additional quarters of groundwater monitoring The general location of the site is illustrated on the Vicinity Map presented in Figure 1 ' 2.0 GROUNDWATER MONITORING This report presents the results of two groundwater sampling events conducted on August 1, 2001 and November 15, 2001, approximately 18 months and 21 months, respectively, after cessation of active ' remediation at the site The sampling and sample handling procedures used for monitoring sampling event are presented in Appendix A The locations of the groundwater monitoring wells and other relevant features are shown on Figure 2 Table 1 summarizes the construction details for all monitoring and co-extraction wells installed for site investigation, groundwater monitoring and site remediation 2.1 Groundwater Analytical Results A summary of all groundwater analytical results to date, including the August 1 2001 results and the most recent November 15, 2001 results are presented in Table 2 and are also shown on Figures 3a and 3b Copies of analytical reports and chain-of-custody documents are presented in Appendix B The only anomalous result reported was total petroleum hydrocarbons (TPHg) reported at a concentration of 5,500 rmcrograms per Mer(pg/L)in the groundwater sample collected from monitoring ' well SRK-MWl The ldburdtory comment regarding the reported concentration was that the ` chromatograph pattern was "not typical of fuel " Monitoring well SRK-MW1 was resampled on November 28, 2001 The TPHg result on the resample was 72 gg/L, only slightly above the laboratory detection linut (50gg/L) and consistent with historical records for the well There is no verifiable explanation of the earlier result although laboratory contamination is a possibility I 1 Value Reclamation, Manteca,CA ' CvArTc ATC Project No 75 99975 7501 January9,2002