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. Report Second Phase Subsurface tnvaripbon <br /> City of Stocl=n, Banner bland. Stockton, CA <br /> May 20, 1992 <br /> W0602.1D <br /> none of the levels detected exceeded the Total Threshold Limit Concentration values as listed <br /> in Title 22 of the California Code of Regulations; however, one sample contained concentrations <br /> of selenium (WPRR-MW3) above the State Primary MCL. Selenium also exceeds the MCL at <br /> Banner Island. <br /> One groundwater monitoring well located at the Stockton Police Station (BI-PS)and one located <br /> at the Southside Channel Redevelopment site (BI-SCD7)were sampled on May 12, 1992 (Figure <br /> 4). These wells were selected for sampling because they had no prior history of hydrocarbon <br /> impaction and are considered to be "clean". <br /> Laboratory analysis indicated a majority of the Title 22 metals are above method detection limits <br /> in the groundwater samples collected from both wells. Again, none of the levels detected <br /> exceeded the Total Threshold Limit Concentration values as listed in Title 22 of the California <br /> Code of Regulations; however, some of the samples contained concentrations of arsenic (BI- <br /> SCD7), barium (BI-PS), chromium III (BI-PS), and selenium (BI-SCD7 and BI-PS) above their <br /> State Primary MCL. These are the same metals that exceed their MCL's at Banner Island. <br /> The laboratory results are presented in Table 6. Laboratory reports, chain-of-custody <br /> documentation, and laboratory QA/QC data are included in Appendix G. <br /> �oaa��zsnr 11 <br />