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ENVIRONMENTAL HEALA DEPARTMENT <br /> Pp U.iN SAN JOAQUIN COUNTY <br /> o Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bergman,R.E.H.S. <br /> Director 304 East Weber Avenue,Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> F ORS` Laurie A.Cotulla,RE.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> THE ROBERT AND CLEO VIEIRA FAMILY TRUST, ET AL SEP 18 2003 <br /> ROBERT R. AND CLEO R. VIEIRA, CO-TRUSTEES <br /> C/O ROBERT R. AND CLEO R. VIEIRA, CO-TRUSTEES <br /> 1131 WEST BOWMAN ROAD <br /> STOCKTON CA 95231-9612 <br /> RE: ACCESS AGREEMENT <br /> 26106 Patterson Pass Road <br /> Tracy, CA <br /> San Joaquin County Environmental Health Department (EHD) has received copies of letters <br /> sent by Stratus Environmental, Inc. (Stratus) on behalf of Atlantic Richfield Company (ARCO), a <br /> subsidiary of British Petroleum Oil Company (BP) to Vieira Ranch, c/o Mary H. Vieira, 6508 East <br /> Waterloo Road, Stockton, CA 95215, dated 12 February 2003 and 31 March 2003, requesting <br /> you sign an access agreement to your property at 26106 South Patterson Pass Road, Tracy, <br /> California (26106 site) so that an ongoing investigation of an unauthorized release of fuel <br /> hydrocarbons from an underground storage tank (UST) system at 25775 South Patterson Pass <br /> (25775 site) can proceed. To date, there has been no response from you regarding signing the <br /> access agreement, perhaps due to the address and addressee utilized. EHD has prepared this <br /> letter to bring to your attention some important information. <br /> EHD is contracted with the California State Water Resources Control Board to provide <br /> regulatory oversight for the investigation and remediation of leaking UST sites. Responsible <br /> parties (UST owners, operators, landowners) are required under California State laws to actively <br /> investigate, delineate, and determine remedial actions in order to return the petroleum <br /> contaminated soil and groundwater to 'pre-release' conditions. <br /> Stratus and others have installed numerous borings, ground water monitoring wells and soil <br /> vapor extraction wells on the 25775 site, on the public right-of-way, and a few wells and/or <br /> borings on your 26106 site. Data acquired from these borings indicate that there is a high <br /> likelihood that free liquid fuel hydrocarbons released from the UST system on the 25775 site <br /> have been and are migrating through the subsurface from the 25775 site to your 26106 site. <br /> The amount of fuel hydrocarbons that have migrated or are currently migrating onto your site is <br /> unknown, but potentially pose a serious threat to ground water migrating down the canyon <br /> through the subsurface. Based on the current site model, it appears that the monitoring/vapor <br /> wells previously installed on the 26106 site did not go deep enough to encounter the stratum <br /> believed to be acting as a migration pathway for the free liquid fuel hydrocarbons. To fully <br /> characterize the release impacting the 26106 site and evaluate its threat to ground water, and to <br /> determine remediation requirements and methods, further investigation of the release on the <br /> 26106 site is required. This is the reason Stratus has requested your permission to access your <br /> property to install the additional wells and/or borings. To date, you have not responded to these <br />