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LIMITED GROUNDWATER INVESTIGATION MONIERLIFETILE LATHROP AND FRENCH CAMP FACILITIES SAN JOAQUIN COUNTY, CALIFORNIA 1.0 INTRODUCTION On behalf of MonierLifetile,LLC (MonierLifetile),Brown and Caldwell is pleased to submit this report summarizing the results of the limited groundwater investigation in the area of the waste reject roof tile stockpiles located at the Lathrop and French Camp facilities (Figure 1). These activities were performed in response to the Central Valley Regional Water Quality Control Board's (CV-RWQCB) request for characterization of shallow groundwater quality for total and dissolved chromium (Cr) as determined by EPA Test Method 6010 and for dissolved chromium VI (Cr VI) using EPA Test Method 7199 in a letter dated January 18, 2001. On behalf of MonierLifetile,Brown and Caldwell submitted a letter workplan entitled "Workplan for a Limited Groundwater Investigation, Mor ierLifetile's Lathrop and French Camp Facilities, San Joaquin County, California" to the CV-RWQCB on March 30, 2001 for approval. Workplan approval was granted from the CV- RWQCB in a letter dated April 24, 2001. As outlined in the Workplan,Brown and Caldwell collected a total of ten shallow groundwater samples in the vicinity of the waste reject roof tile stockpiles located at the MonierLifetile Lathrop and French Camp facilities on,May 7 and 8, 2001. The objective of the groundwater sampling activities was to determine if shallow groundwater contains Cr and/or Cr VI at concentrations above the water quality goals (WQGs). In this case, the water quality goal referenced by the CV- RWQCB was the California Public Health Goal (PHG) of 0.2 microgram per liter (µg/L) for Cr VI in drinking water. The PGH for Cr is 2.5 µg/L in drinking water. 1.1 Background AMSC, in support of MonierLifetile's application to classify waste crushed tile as inert and reuse as rubble fill, submitted the report"Classification of Waste Concrete Tile from MonierLifetile's L athrnp and French Camp, California Facilities" on December 26, 2000. The CV-RWQCB's review noted that the waste material was reported to contain Cr VI at concentrations, determined by waste extraction test methods utilizing deionized water (DIWET),greater than the PHG in drinking water of 0.2 µg/L. The CV-RWQCB also noted that total Cr concentrations determined by the Soluble Threshold Limit Concentration (STLC) method in the "Crushed Tile Characterization and Reuse Report" prepared by Kleinfelder (May 2000) had an average concentration of 0.52 milligrams per liter (mg/L) and a maximum concentration of 1.3 mg/L. Based on these results, the CV-RWQCB requested additional characterization of the waste tile stockpiles and surface water for Cr VI as determined by the DIWET method. A limited characterization of the shallow groundwater in the stockpile areas was also requested on January 18, 2001. The waste reject roof tile stockpiles were sampled by Brown and Caldwell on March 29 and 30, 2001 and analyzed for extractable levels of Cr and Cr VI using the DIWET method. Storm water samples were collected following two rainfall events at both facilities by Mor ierLifetile on February 23 and March 5 of 2001. The results of these activities are summarized in the report entitled "Stockpile and Storm Water Sampling Reports' (Brown and Caldwell, April 2001) which was submitted to the CV-RWQCB on April 27, 2001. The results of the stockpile and storm water sampling activities are summarized below: PAwp\jobs\20587\LP-FCGW.doc—DCN 102300 June 2001