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AlITTELHAUSER <br /> corporation <br /> 7901 Stoneridge Drive, Suite 123 <br /> Pleasanton, California 94588 <br /> Bus: (510) 416-2900 <br /> Fax: (510) 416-0957 <br /> October 7 , 1992 <br /> Ms. Elizabeth A. Thayer E8 <br /> Associate Engineer OCT 13 1952 <br /> Regional Water Quality Control Board ENVIRONMENTAL HEALTH <br /> Routier Road, Suite A <br /> Sacramento, California 95827-3098 PERMIT/SERVICES <br /> SUBJECT: Soil Stockpile Results <br /> Vacant lot located on West 12th Street <br /> Tracy, California <br /> Dear Ms. Thayer: <br /> Attached please find the analytical results for samples <br /> of the soil stockpile collected from the vacant lot located near <br /> the subject site (see Figures 1 and 2 ) . <br /> These analyses were performed in response to your letter <br /> of September 10, 1992 . Your previous letter of April 30 , 1992 <br /> expressed concern that the previous soil analysis at this site had <br /> shown heavy metal values for total metals in excess of the Title 22 <br /> criteria for soluble metals. The specific metals of concern <br /> included Barium, Chromium, Lead and Nickel. <br /> In accordance with your letter of September 10, 1992 and <br /> subsequent phone conversations, three soil samples were collected <br /> from the soil stockpiles as shown in Figure 3 . The samples were <br /> transported to ChromaLab, a State Certified laboratory located in <br /> San Ramon, California. The laboratory checked for soil pH and <br /> measured a range of pH values between 7 . 2 and 8 . 0 . Accordingly, <br /> the soils were then extracted with deionized water and analyzed for <br /> the metals of concern. <br /> The data indicates that none of the detected metals <br /> approach the Title 22 criteria for solubility. From this data we <br /> conclude that the metals present in these soils do not pose a <br /> threat to water quality. <br /> We appreciate your assistance with this project and will <br /> look forward to your recommendation for "Closure" at this site. <br /> Groundwater was sampled from the subject property on October 5, <br /> 1992 and a quarterly monitoring and sampling report is forthcoming. <br /> ® CHICAGO, IL BAKERSFIELD, CA INDIANAPOLIS, IN LAGUNA HILLS, CA <br />