ARCHIVED REPORTS XR0000128 - Laserfiche WebLink

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Woodward-Clyde Consultants i The analytical results for lead ranged from 2 8 mg/kg to 9 7 mg/kg These concentrations are believed to correspond to naturally occurring lead levels in the soil TFH was not encountered in any of the groundwater samples collected during this investigation Free product was not observed in any of the three wells during the groundwater investigation. Benzene and total xylenes were detected in the groundwater samples. The analytical results for the soil samples collected above the groundwater interface were below the detection limit of the analyses for TPH and BTEX Elevated levels of fecal coliform were detected in monitoring wells MW-2 and MW-3 at 2 MPN/100 ml and 6 MPN/100 ml, respectively 1.3 PURPOSE The purpose of this report is to provide quarterly groundwater monitoring data for the Mayor Mart site as requested by SJCPHS in a letter dated November 12, 1991 This report was • prepared following the report requirements as specified in the November 12, 1991 letter, and Appendix A -Reports, Tri-Regional Board Staff November 1990 Draft Guidelines titled "Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites " 1.4 SCOPE The scope of WCC's work during the quarter ending December 1991 included the collection of quarterly groundwater monitoring data. To conduct this monitoring WCC completed the following tasks- I measured the water level in each well, 2. purged the wells of approximately three well casing volumes, I sampled the purged wells for TFH, BTEX, total lead and fecal coliform, 4. submitted the samples collected on December 31, 1991 to Matnx Environmental Laboratories, Inc (Matrix) in Rancho Cordova, California and Anlab in Sacramento, California for analysis, and S evaluated and tabulated the data, and prepared contaminant maps 91CO238RIMAJORMART QRPT 02-2x92 1-7