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Chevron <br /> May 14, 1999 ; Chevron <br /> Ms. Kristen Rocha <br /> Regional Water Quality Control Board <br /> Chevron Pipe Line Company <br /> Central Valley Region 4000 Executive Parkway,Suite 400 <br /> 3443 Routier Road, Suite A San Ramon,CA 94583 <br /> Sacramento, California 95827-3098 P.O.Bax 6059 <br /> San Ramon,CA 94583-0759 <br /> Surland Homes Property (Laurelbrook) <br /> Tracy, California <br /> Dear Ms. Rocha: <br /> Chevron Pipe Line Company (CPL) proposes to install one monitoring well at the subject site <br /> (Figure 1) and to perform quarterly groundwater monitoring of site monitoring wells. The <br /> monitoring well is being installed at your request to provide sufficient data to estimate the <br /> direction of groundwater flow in the vicinity of the site. <br /> CPL proposes installing the monitoring well near lots 63 and 64 on Dorset Lane (Figure 2). <br /> The monitoring well will be installed to a depth of approximately 14 feet below ground surface <br /> (bgs) and will be constructed as shown on Figure 3. Upon completion,the well will be <br /> developed and purged until water quality parameters stabilize. After well development and <br /> purging have been completed a quarterly monitoring program will be initiated. Groundwater <br /> samples will be collected from all wells that do not contain separate phase petroleum <br /> hydrocarbons. Samples will be analyzed for benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX)using EPA Method 8020A,polyaromatic hydrocarbons (PAHs) using EPA Method <br /> 8270 SIM, gasoline range petroleum hydrocarbons using EPA Method 8015M, and diesel <br /> range petroleum hydrocarbons with and without silica gel cleanup using EPA Method 8015M. <br /> Upon receipt of your approval of the work plan, CPL will coordinate the work with the <br /> developer. If you have any questions or require additional information, please call either <br /> Elizabeth Lu at (925) 842-6855 with Geomatrix Consultants, Inc. or me at(925)842-6877. <br /> Sincerely, <br /> K.L. Hower <br /> Project Manager <br /> California Site Remediation <br /> cc: Elizabeth Lu—Geomatrix Consultants, Inc. <br /> Michael Keim—Geomatrix Consultants, Inc. <br /> Attachments <br />