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1673$Von Kalman,Suite 200 5a., SOa la.tn nLLn <br /> irvine_CA 92606 l 1 <br /> 7S1;(949)(949660-107C &Nircnmtm+rAJ <br /> • Fax:(949)474-0940 <br /> (A-�v�� • N(a rga f�-�" 1�9e <br /> March 30, 2001 <br /> Mx. Ross D.Atkinson <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Environmental Engineering 6 ConSuRing 3443 Routier Road, Suite A. <br /> Sacramento, California 95827-3003 12/20587-400 <br /> Subject: Workplan for A Limited Groundwater Investigation <br /> Monicd-ifetile's Lathrop and French Camp Facilities <br /> San Joaquin County, California <br /> Dean Mt. Atkinson: <br /> On behalf of MonietLifetile,LLC (MowerL.ifedle), Brown and Caldwell is pleased to <br /> present this letter workplan for a limited groundwater investigation in the area of the <br /> waste tile stockpiles at the above referenced facilities (Figure 1). This workplan was <br /> prepared in response the Central Valley Regional Water Quality Control Board's <br /> (CV-RWQCB) letter to Mr. Peter Moore of MonierLifetile dated January 18, 2001. <br /> Background <br /> AMEC,in support of MonietLifetile's application to classify waste crushed tile as inert <br /> and reuse as rubble fill, submitted the report "Classification of Waste Comarte Tile firm <br /> MonierLifetrle s Lathrop and French Camp, California Facilitie?' on December 26,2000. The <br /> CV-RWQCB's review noted that the waste tuaterial was reported to contain chromium <br /> VI at concentrations determined by the DIWET method greater than the California <br /> Public Health Goal (PHG) in dzi4ing water of 0.2 µg/L. The DIWET barium <br /> concentrations were noted to be in excess of the USEPA Integrated Risk Information <br /> System Reference Dose as a drinking water level of 480 µg/L. The CV-RWQCB also <br /> noted that total chrornium concentrations determined by the Soluble Threshold Limit <br /> Concentration (STLC) method in the `Crushed Tile Characteritiation and,Reuse Reporf' <br /> prepaxed by Kleinfeldet, submitted September 11, 2000, had an average concentration of <br /> 0.52 mg/L and a maximum concentration of 1.3 mg/L. Based on these results, the CV- <br /> RWQCB requested additional characterization of the waste tile piles and surface water <br /> for chromium VI as determined by the DIWET methods. A limited characterization of <br /> the shallow groundwater in the sto,.kpile areas was also requested on January 18, 2001. <br /> The waste stockpile sampling activities ate included in the letter workplan entitled <br /> "Vorkplan for Stockpile Sampling,Monterl ifettle L.athrvp and French Canrp Facilities" prepared <br /> by Brown and Caldwell (March 27,2001). This workplan presents the proposed limited <br /> groundwater investigation at these Facilities. <br /> 1L\w(t\jobs\20587\101253 Gmdwa(ct%Rdoc <br /> EVV-d ZOO d ZZI-1 OVU0 IV96 113401V) ONV NMOH-woad wegg:O[ 1004-0E-adV <br />