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WN <br /> INTERNATIONAL 4585 Pacheco Boulevard <br /> TECHNOLOGY Martinez,California 94553-2233 <br /> CORPORATION 510-372-9100 <br /> Fax: 510-372-5220 <br /> April 9, 1999 <br /> IT Project Number 777287 <br /> Mr. Joseph Mello <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Subject: Response to RWQCB Review of Groundwater Investigation Work Plan <br /> All-Pure Chemical Company, Tracy, San Joaquin County, California <br /> Dear Mr. Mello: <br /> This letter, submitted by IT Corporation (IT) on behalf of All-Pure Chemical Company (All-Pure), <br /> is in response to the Regional Water Quality Control Board's (RWQCB) continents from their <br /> review of the March 3, 1999 Work Plan, Groundwater Investigation, prepared for All-Pure's <br /> Tracy, California, facility. The RWQCB comments are italicized and IT's response follows in <br /> regular font. <br /> 1. A groundwater sample collected at least four years ago from a Geoprobe location (GP012) <br /> located approximately 3,200 feet north-northeast of the All-Pure facility contained 30.9 ugll <br /> chloroform a T.0 ug carbon tetras ortde The neares�proposezi�roundwater sample <br /> location in the work plan is 1,600 feet from GP012. A groundwater sample needs to be <br /> obtained adjacent to location GP012 for comparison to groundwater analytical results for <br /> samples obtained nearer the A11-Pure facility. <br /> The comment is noted and it is agreed that an additional groundwater sample location will be <br /> added in the vicinity of former Geoprobe location GP012. <br /> 2. The work plan states that figures summarizing the analytical data will be included in a site <br /> investigation report. Analytical data figures shall include contours showing <br /> isoconcentrations of carbon tetrachloride and chloroform. <br /> All-Pure agrees to include analytical data figures including contours showing isoconcentrations of <br /> carbon tetrachloride and chloroform in the final site investigation report. <br /> tcygw6d <br /> IT Corporation is a wholly owned subsidiary of International Technology Corporation <br />