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San Joaquin County <br /> urN DIRECTOR <br /> �oP� x co <br /> Environmental Health Department Donna Heran,REHS <br /> _ 2 600 East Main Street ASSISTANTDIRECTOR <br /> L. WY, Laurie Colulla,REHS <br /> Stockton, California 95202-3029 <br /> + PROGRAM COORDINATORS <br /> - - Margaret Lagodo,REHS <br /> ` P4Cr NSP Website: WWW.SJgoV.Org/ehd - Robert McClellon,REHS <br /> Phone: (209)468-3420 Jeff Carruesco,REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> September 24, 2009 <br /> Mr. Michael Kalvelot <br /> Quik Stop Markets, Incorporated <br /> 4567 Enterprise Street <br /> Fremont, California 94538 <br /> Subject: Quik Stop Market No. 132 <br /> j„ 3555 West Hammer Lane �- <br /> Stockton, California 95209 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Additional Investigation Work Plan—Addendum, dated July 28, 2009, prepared by ATC <br /> Associates Inc. (ATC) for the above-referenced site on your behalf. The work plan was <br /> submitted in response to an EHD letter dated June 5, 2009, concerning the <br /> �. advancement of three soil borings (SB-4, SB-5, and SB-6). <br /> In the work plan, ATC proposes to relocate soil boring SB-4 directly south in an area ' <br /> midway between the two north dispenser islands. ATC justified the new location for <br /> SB-4 based on a site plan by Exceltech, Inc. (Exceltech) dated September 18, 1990, <br /> obtained from the EHD. Unfortunately, the site plan provided by the EHD was not very <br /> legible and the proposed location for SB-4 is where boring QS-1 (not QS-2) was <br /> c. advanced on October 12, 1990. The EHD is including another site map (Plate 4) titled <br /> TPHG Contamination above 11 Peet Depth in PPM, prepared by RESNA Industries Inc. <br /> (RESNA), formerly known as Exceltech. According to information on the site plan <br /> ` prepared by RESNA, the source for this map was taken from the Exceltech report 3- <br /> 49132-41 dated November 29, 1990. This map by RESNA, prepared after soil borings <br /> QS-1, QS-2, and QS-3 were advanced on October 12, 1990, clearly demonstrates that <br /> boring QS-2 was advanced northwest of the north dispensers and approximately twelve <br /> 1"' feet northeast of boring B-5, and approximately eight feet northwest of boring B-3. Since <br /> the site map submitted by Exceltech was dated prior to when soil samples were <br /> collected from QS-2, the site map prepared by RESNA appears to be the more accurate <br /> a. of the two site maps. Please resubmit the revised location for advancing SB-4 based on <br /> the site map from RESNA. <br /> Although ATC did not provide technical justification for collecting grab groundwater <br /> samples from soil boring SB-4 at fifteen and forty feet below surface grade (bsg) and soil f <br /> samples at the capillary fringe, the EHD approves the collection of these soil and <br /> groundwater samples to assess residual contamination in the approximate area of QS-2. <br /> �.. f <br /> L. <br /> i <br /> i <br /> V <br />