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V <br /> �. <br /> (:VYJ <br /> ATC Assoclia 946 8 7�%Tc 6602 Owens Drive,Suite 1d0 <br /> Pleasanton,California to <br /> Phone(925)460-5300 <br /> A s a o C i A T E s 1 N c . Fax(926)463-2559 <br /> www.atcassoclates.corn <br /> a. May 18,2009 i <br /> Ms.Victoria L. McCartney SanJoaquinJoaquin County <br /> 6W Environmental Health Department <br /> Stockton, <br /> 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 /> i_ <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 /> V <br /> Development of HASP; <br /> Permitting; <br /> 60 • 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 /> 6" 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 groundwater data gaps <br /> identified by the SJCEHD. This includes further evaluation of the horizontal and lateral 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 facilitytothe southeast. in addition,the <br /> scope of work will address the concern that impacted soil may remain near the original release location <br /> �y/ Additimat inm6gatiun Workplan <br /> V _ Qua Stop No.132,Stakim CA <br /> May r$2009 t <br /> V <br />