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GROUNDWATER MONITORING PLAN MONIERLIFETILE LATHROP AND FRENCH CAMP FACILITIES SAN JOAQUIN COUNTY, CALIFORNIA 1.0 INTRODUCTION On behalf of MonierLifetile LLC (MonierLifetile), Brown and Caldwell is submitting this groundwater monitoring plan for the Lathrop and French Camp facilities (Figure 1) to address Task 3 of the preliminary Cleanup and Abatement Order (No 5-01-722) issued to MonierLifetile LLC by the Central Valley Regional Water Quality Control Board (CV-RWQCB) on October 15, 2001. A preliminary action plan was submitted to the CV-RWQCB on November 15, 2001 that presented a preliminary schedule and the objectives of the monitoring system. The monitoring system as proposed in this plan will be used to further assess groundwater quality, gradient, and site specific background conditions in the area of the stockpiled material (broken and uncured roof tile material) at these two facilities: 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 Lathrop 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 Characterisation 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. A limited characterization of the shallow groundwater in the stockpile areas was also requested on January 18, 2001. Brown and Caldwell sampled the stockpiles in March 2001, and MonierLifetile collected storm water samples following two rainfall events at both facilities in February and March 2001 (Brown and Caldwell, April 2001). A one-time grab groundwater sample investigation was conducted at each facility in May 2001 (Brown and Caldwell 2001). Based on these investigations chromium and chromium VI were detected at in the stockpile, storm water,and grab groundwater samples. The results of the stockpile, storm water, grab groundwater sampling activities are summarized below: PAwp\jobs\20587\CA0 G%\'Workplan.doc—DCN 12495 January 2002