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R! IEIL 1 <br /> CEIV�, <br /> Harding Lawson Associates J V 2 6 991ik <br /> �-- <br /> July 21, 1991 S E P 3 1991 <br /> Revised July 25, 1991 UNVIPON MENTAL HEALTH <br /> it <br /> 17060, 025. 03 � L % I "3 <br /> The Southland Corporation <br /> 5820 Stoneridge Mall Road, Suite 310 <br /> Pleasanton, California 94588 <br /> Attention: Mr. Hal Miller <br /> Manager, Environmental Services <br /> I Gentlemen: <br /> Results of Second 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 /> � j Harding Lawson Associates (HLA) for the second quarter of <br /> 1991 at the 7-Eleven convenience store, 455 Grant Line Road <br /> in Tracy, California. The site is shown on Plate 1. This <br /> report describes the field procedures used and presents the <br /> results of chemical analyses, comparing them with previous <br /> chemical data for the site. <br /> BACKGROUND <br /> HLA was retained to perform a soil and groundwater <br /> investigation at the 7-Eleven store in November 1987, <br /> following an underground tank leak. As part of that <br /> investigation, we installed 15 monitoring wells on and <br /> immediately adjacent to the site (Plate 1) . The results of <br /> our multi-phased investigation were submitted in a "Problem <br /> Assessment Report" (PAR) dated January 10, 1989 , to the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> and the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) . That document also <br /> included the results of a feasibility study and <br /> recommendations for remediation. <br /> In March 1989 , the underground tanks and fuel dispensing <br /> , facilities were removed from the site. During these <br /> Engineering 3na 1355 Willow Way Suite 109 Concord CA 94520 41516879660 <br /> E IvireninPril31 Services 15[dn.i,,n u)HanhnX lyra rr+rrs•Offs­ <br /> '4,x,amurL <br />