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t <br /> California Refonal Water Quality Control Board <br /> - <br /> Dr. Alan Lloyd Central Valley Region <br /> Secretaryfir Arnold Schwarzene er <br /> Environmental Robert Schneider,Chair Governor gg <br /> Protection <br /> 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> (916)464-3291 •Fax(916)4644775 <br /> hap://www.swrcb.ca.gov/rwqcb5 <br /> 22 December 2005 <br /> Ms. Sandra Glenn <br /> MonierLifetile <br /> 3511 North Riverside Ave <br /> Rialto, CA 92377 <br /> RESPONSE TO SOIL INVESTIGATION WORKPLAN, LATHROP AND FRENCH CAMP <br /> FACILITIES, MONIERLIFETILE LLC., SAN JOAQUIN COUNTY (CASE NO. 4503) <br /> Staff has reviewed the Soil Investigation Work Plan, December 2005, Lathrop and French Camp, <br /> California(Plan) submitted on 8 December 2005. The Plan proposes to investigate soils at <br /> MonierLifetile's Lathrop and French Camp plants for TPH-diesel and/or Chromium contamination. <br /> Tile waste piles at these locations are currently undergoing removal and the waste recycled in <br /> compliance with Cleanup and Abatement Order(CAO)No. 5-01-722. The investigation is necessary <br /> to comply with the requirement in Task 4 of the CAO, to - clean close the the waste piles...removing <br /> all waste and any soil containing waste constituents. The investigation is designed to determine how <br /> much if any soil contains waste constituents and must be removed. <br /> At each site, the Plan proposes to advance three direct push borings to 10 feet within the footprint of <br /> the former waste piles. The soils will be inspected and described; and samples will be collected for <br /> analysis for total and extractable TPHd, Cr, and Cr6 at depths of 1, 2,5, 5 and 10 feet. The French <br /> Camp investigation will be carried out in January 2006 and the Lathrop investigation in June 2006. <br /> Depths to groundwater at the Lathrop and French Camp facilities are approximately 25 and 35 feet <br /> respectively. At both facilities, TPHd has been detected in groundwater and staff is concerned that <br /> limiting the borings to 10 feet may not fully define theextent of contaminated soil. The Plan should be <br /> revised to continue all borings to groundwater, collecting samples below 10 feet at intervals of 5 feet <br /> (at 15, 20,...35 feet). <br /> Other than extending the borings to groundwater the Plan complies with CAO No. 5-01-722 and <br /> MonierLifetile may implement the plan at their convenience. <br /> If you have any questions please call me at(916) 464-4614. <br /> Ross D. Atkinson <br /> Associate Engineering Geologist <br /> California Environmental Protection:A;enc <br /> Co Recycled Paper <br />