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Harding Lawson Associates <br /> � f <br /> I <br /> May 23 1991 <br /> S <br /> 17060,024. 03 <br /> Southland Corporation ' <br /> 5820 Stoneridge Mall Road <br /> Pleasanton, California 94566 <br /> Attention: Mr. Walter Lubcke <br /> C i L: <br /> Gentlemen: <br /> Partial Response to SJCPHS p <br /> Letter. Dated May 3 , 1991 I <br /> 7-Eleven Convenience Store <br /> 455 West Grant Line Road <br /> Tracy., California <br /> This letter presents a partial response to' a letter of May 3, w <br /> 1991, by the San Joaquin County Public Health Services (SJCPHS) ' <br /> with respect to the remedial investigation being conducted by w <br /> Harding Lawson Associates (HLA) at 455 West•. Grant Line Road in <br /> Tracy, California. The SJCPHS letter contains seven comments, <br /> followed by a request for quarterly groundwater monitoring and <br /> reporting. The .letter also requests a final remediation plan <br /> . that would be submitted for public notice. <br /> We understand that° the Southland Corporation will respond to - <br /> Comments One through Sik, and that HLA will' 'be authorized to . <br /> perform quarterly groundwater monitoring and reporting for a one <br /> year period beginning in June, .1991. This letter presents a i <br /> rationale for delaying the presentation of a. final remediation r <br /> plan until four quarters of groundwater monitoring data can be <br /> obtained and analyzed. <br /> I, <br /> PROJECT STATUS <br /> HLA has investigated soil and groundwater conditions at the 7 <br /> Eleven Store from November 1987through May° 1989, following an <br /> underground tank leak. As part of the investigation, we <br /> installed 15 monitoring wells on and immediately adjacent to the <br /> site (Plate 1) . In March 1989, Well MW-7 was destroyed during <br /> removal of underground tanks. The .otherlwells are believed to <br /> be still in place. <br /> . I: <br /> Engineering and- 1355 Willow Way. Suite 109, Concord, CA 94520 41516879660 <br /> Environmental Services 4-'Sabsidian of Hanlin¢Ascaciuies•offices Nm8 m(de <br />