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04/03/1996 10:57 9165350200 APEX ENVIR©TECH PAGE 01 <br /> V � <br /> /////APEX 1844 Madill+Avenue.Suite 106• Fair M.cA 95626 <br /> E NY I ROTE ( H , INC . 1,301.242.5249 • Ph.916.535.4700• hx 916.535.0207 <br /> AprU 3, 1996 Post-it-Fax Note 7671 vale �( 3 9 ob, -1 <br /> To r it "V Fran per, Qn t./L r <br /> Ms.M. Lagorio eo.roeol. Co 410 Q--K <br /> Sam Joaquin County Environmental Hcahh Divisiom Phone N Phone•��� _ZZ.'s��S <br /> Post Office Box 2009 Faxw �, �` �.��'� <br /> Stockton,California 95201 <br /> Subject: Soil Boring Verification Workplan Addendum <br /> Moorc Petroleum,Inc. <br /> 1399 East Yosemite Ave.,Manteca,California <br /> Apex Project No. ERA02-006 <br /> Dear Ms. Lagorio: <br /> Apex Envirotech,Inc. (Apex),has been authorized by Moore Petroleum, Inc. (Moore Petroleum), <br /> to submit this Workplan Addendum at the subject site(Figure 1). <br /> VERWICATION SOEL BORINGS <br /> Apex proposes to drill two angle soil borings(VSB-1 and VSB-2)for the purpose of verifying the <br /> absence of petroleum impacted sod beneath the foAmer tank basin. All field work and sampling <br /> will be in accordance to Apex's Standard Operating Procedures(SOP)located in Attachment 1_ <br /> Figure 2 shows the locations of the two proposed angle soil borings. <br /> The two proposed verification soil borings will be drilled at an angle of 30 degrees measured from <br /> vertical. 71ae approximate depth of the former tank basin is 15 feet below grade_ To insure that <br /> we do root drill through any backfill material,which is pea gravel,the two soil borings must be at <br /> least 26 feet away from the former tank basin based on a 30 degree angle boring. The purpose of <br /> not drilling tbrougb any pea gravel is to chminate any possibility of under mining the site. The <br /> two borings will be drilled with the use of a hollow steno auger drill rig and with the use of 8-inch <br /> diameter augers. <br /> Soil sampling will begin at 10 feet of drilled depth, which is 8 feet below grade. Soil samples will <br /> be collected at drilled depth of 10,15,20, 25 and 30 feet. This corresponds to 8, 12, 16, 20, and <br /> 23 feet below grade. Three soil samples from each boring will be selected in the field based on <br /> FW field screening and observations by Apex Field Geologist and a representative of San Joaquin <br /> County Environmental Health. The six soil samples,three from each boring, will be analyzed for <br /> TPH, as gasoline, and BTEX. <br />