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ATC Associates Inc. <br /> Owens Drive, Suite 100 <br /> Pleasanton, California 94588 <br /> (YVATCPhone (925)460-5300 <br /> ASS o c t nre s INC , MEU' <br /> Fax(925) 463-2559 <br /> MAY 4 0 2092 www.atcassociates com <br /> May 18, 2009 ENVIRONMENT HEALTH <br /> Ms. Victoria L. McCartney PERMIT/SERVICES <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> Reference: Quik Stop Market No. 132 <br /> 3555 West Hammer Lane <br /> Stockton, California <br /> ATC Project Number: 75.62503.3206 <br /> Subject: Additional Investigation Workplan <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. (ATC) is pleased to present this Workplan to perform an additional investigation study <br /> at Quik Stop Market No. 132, located at 3555 West Hammer Lane, Stockton, California (site). The <br /> purpose of this Workplan is to address comments regarding the Site Conceptual Model provided in <br /> correspondence from the San Joaquin County Environmental Health Department (SJCEHD) dated <br /> September 23, 2008. The additional investigation and testing will include the following activities: <br /> • Development of HASP; <br /> • Permitting; <br /> • Soil Boring Advancement and Soil/Groundwater Sample Collection; and <br /> • Preparation of an Additional Investigation Report/Update Site Conceptual Model (SCM). <br /> Previous investigations and ongoing quarterly groundwater monitoring indicate the presence of methyl-tert <br /> butyl ether(MTBE) in groundwater beneath the site. Results of these and other investigations performed <br /> in the site vicinity indicate that shallow groundwater exists below the site at depths ranging from <br /> approximately 7 to 19 feet below ground surface (bgs). Historical groundwater flow is towards the <br /> southeast. <br /> The purpose of this soil and groundwater investigation is to address soil and groync�watrata gaps <br /> identified by the SJCEHD. This includes further evaluation of the horizontal and later la extent of impacted <br /> groundwater in the vicinity of the former Underground Storage Tanks (UST) and the potential for <br /> downgradient MTBE migration beneath the neighboring Taco Bell facilityto the southeast. In addition,the <br /> scope of work will address the concern that impacted soil may remain near the original release location <br /> u �� Additional Investigation Workplan <br /> Quik Stop No. 132,Stockton,CA <br /> ,,,,,,,,,, ,,,, Mayay18,18,2009 <br />