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Aw <br /> Harding Lawson Associates <br /> March 19, 1992 <br /> I <br /> ' 17060, 025. 03 <br /> The Southland Corporation ' <br /> 5820 Stoneridge Mall Road, Suite 310 <br /> Pleasanton, California 94588, <br /> l Attention: Mr. Bud Good <br /> Manager, Environmental Services <br /> Gentlemen: <br /> Results of Fourth Quarter Monitoring, 1991 <br /> 7-Eleven Convenience Store <br /> 455 Grant Line Road <br /> Tracy, California <br /> This letter reports the results of groundwater monitoring by <br /> Harding Lawson Associates (HLA) for the fourth quarter of 1991 ; <br /> at the 7-Eleven convenience store, 455 Grant Line Road in Tracy, <br /> California. The site is shown on Plate 1. This report <br /> describes the field procedures used and presents the results of . <br /> chemical analyses, comparing them with previous chemical data <br /> `+ for the site. In addition, this fourth quarter report responds <br /> to a letter dated December 10, 1991 from the San Joaquin County <br /> Department of Public Health Services, Environmental Health <br /> .. : Division (SJCDPHS) . <br /> x <br /> BACKGROUND <br /> HLA was retained to perform a soil and groundwater investigation { <br /> at the 7-Eleven store in November 1987, following an underground <br /> tank leak. As part of that investigation, we installed 15 .. <br /> ` monitoring wells on and immediately adjacent to the site <br /> (Plate 1) . The results of our multi--phased investigation were <br /> -- submitted in a "Problem Assessment Report" (PAR) dated January <br /> 10, 1989, to the Central Vall6y Regional Water Quality Control <br /> Board (CVRWQCB) and the SJCDPHS. That document also included <br /> the results of a feasibility study and recommendations for <br /> remediation. <br /> I <br /> _ Engineering and 1355 Willow Way,Suite 109,Concord,CA 94520 5101687-9660 <br /> Environmertal ServicLs A Subsidiary of Harding Aa"iates •Offrces Nationwide <br />