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GROUND ZERO ANALYSIS, INC. <br /> 3422 W. I1,uniner Lane, Suite C-294 <br /> Stockton, Califm-nia 95219 2 <br /> Telephone: (209) 952-3481 <br /> Facsimile: (209) 952-9891 <br /> March 7 , 1995 <br /> Ms. Linda Turkatte <br /> San Joaquin County—Public Health Services <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Response to letter dated February 15 , 1995 and Workplan <br /> Addendum for Knowles Property, 102 South Wilson Way, <br /> Stockton, California <br /> Ground Zero Analysis, Inc. (Ground Zero) has prepared this response <br /> and workplan addendum to address comments in your letter dated <br /> February 15, 1995 and summarize our telephone conversation on <br /> February 27, 1995. <br /> In our conversation I mentioned the aerial photograph showing the <br /> distance between the former USTs and the westernmost dispenser <br /> island and suggested that one soil boring in this area should be <br /> sufficient to evaluate soil beneath the former product piping. The <br /> exact location will be finalized on the date of drilling after <br /> correlating existing site features and the aerial photograph. Soil <br /> boring SB-24 will be drilled to a maximum depth of approximately 40 <br /> feet below ground surface (bgs) . Soil samples collected from the <br /> boring will be analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) and benzene, toluene, ethylbenzene, and total <br /> xylenes using EPA methods 8015 and 8020, respectively. <br /> Ground Zero will drill three soil borings (SB-25, SB-26, and SB-32) <br /> previously proposed in our letter to you (dated January 4, 1995) at <br /> locations shown on the attached site plan. <br /> No data is available from soil samples collected from beneath the <br /> former USTs during removal of one 7,500-gallon and one 12 ,000- <br /> gallon UST in December 1978. Therefore, Ground Zero proposes <br /> drilling five soil borings (SB-27 through SB-31 ) to a maximum depth <br /> of approximately 40 feet bgs each in order to further evaluate soil <br /> conditions in native soil beneath the former USTs (previous soil <br /> boring TB-7 was located below the south end of the 12 ,000-gallon <br /> UST) . Angle borings may be needed because the former UST <br /> excavation has not been backfilled completely. Soil samples will <br /> be collected at five foot intervals in native soil and analyzed for <br /> TPHg and BTEX using EPA methods 8015 and 8020, respectively. <br /> Ground Zero will also collect soil samples for physical analyses. <br /> The purpose of the physical analyses is to evaluate the physical <br /> parameters of the vadose zone. <br />