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16735 Von" -man,Suite 200 Irvine,CA 6 Tel. ( 660-1070 Fax (949)q7 -094 0 March 30, 2001 ENVIRONMENT HEALTH LIFQ ll� Ll lJ7LIEE PERMIT/SERVICES u u C�u Mr. Ross D. Atkinson MAY 1 2 0 01 California Regional Water Quality Control Board Central Valley Region ENVIRONMENT HEALTH Environmental Engineering&Consulting 3443 Routier Road, Suite A PERMIT/SERVICES Sacramento, California 95827-3003 12/20587-400 Subject: Workplan for A Limited Groundwater Investigation MonierLifetile's Lathrop and French Camp Facilities San Joaquin County, California Dear Mr. Atkinson: On behalf of MonierLifetile, LLC (Monied ifetile), Brown and Caldwell is pleased to present this letter workplan for a limited groundwater investigation in the area of the waste tile stockpiles at the above referenced facilities (Figure 1). This workplan was prepared in response the Central Valley Regional Water Quality Control Board's (CV-RWQCB) letter to Mr. Peter Moore of MonierLifetile dated January 18, 2001. Background AMEC,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 Monierllfetile'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 chromium VI at concentrations determined by the DRVET method greater than the California Public Health Goal (PHG) in drinking water of 0.2 µg/L. The DIWET barium concentrations were noted to be in excess of the USEPA Integrated Risk Information System Reference Dose as a drinking water level of 480 µg/L. The CV-RWQCB also noted that total chromium concentrations determined by the Soluble Threshold Limit Concentration (STLC) method in the "Crushed Tile Characterization and Reuse Report" prepared by Kleinfelder, submitted September 11, 2000, had an average concentration of 0.52 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 piles and surface water for chromium VI as determined by the DIWET methods. A limited characterization of the shallow groundwater in the stockpile areas was also requested on January 18, 2001. The waste stockpile sampling activities are included in the letter workp:an entitled "WYorkplan for Stockpile Sampling,MonierUjetile Lathrop and French Camp Facilities' prepared by Brown and Caldwell (March 27, 2001). This workplan presents the proposed limited groundwater investigation at these facilities. P\wp\lobs\20587\102253 Groundwater\LRdoc