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Clayton <br /> I%%IR %%IFN TAL <br /> CI)%SL:LI t`IS <br /> horizontal and vertical extent of petroleum contamination around well MW-3B. The <br /> -. plan was approved by SJC/EHD. <br /> Clayton was retained by OSH to complete the following tasks- <br /> - install five boreholes around MW-3B <br /> - Quarterly groundwater sampling of MW-3B <br /> • Excavate a second septic tank <br /> # These tasks were documented in our report,Additional Soil and Groundwater <br /> Investigation for Orchard Supply Hardware, dated May 21, 1991, and are summarized in <br /> the following subsections. <br /> r., 6.1 INSTALLATION OF BOREHOLES AROUND MW-311 <br /> Installation and sampling of five boreholes (BH-1, BH-2, BH-3, BH-4, and BH-5) was <br /> performed on April 5, 1991. The borehole installation was observed by Ms. Hinson. <br /> Borehole locations were selected to better define the extent of shallow soil <br /> i= contamination in the vicinity of monitoring well MW-313 and the leach line from <br /> former septic tank #1 (Figure 5). This septic tank was removed by Clayton or.August <br /> 17, 1990. <br /> Soil samples were collected from 4 feet and 9 feet bgs. They were analyzed for <br /> 1` "^ hydrocarbons by EPA Method 5520F. Hydrocarbons were not detected in any of the <br /> soil samples collected from the boreholes. <br /> ' 6.2 SEPTIC TANK#2 REMOVAL, <br /> i Clayton Obtained a permit for septic tank #2 destruction from San Joaquin County <br /> i Public Health Services.'Septic tank #2 was originally used by Grantline Station (a <br /> tavern),located at 8885 W. Grantline Road. Fuel Oil Polishing and Carl's Trenching <br /> J A <br /> t, Services from Sonoma, California,provided the septic tank excavation and closure <br /> r services under subcontract to Clayton. Figure 5 show_ s the approximate location of <br /> € the removed septic tank. <br /> } On April 25, 1991,we began field activities for.the proper destruction of the septic <br /> L: <br /> tank. Granite Construction was performing road construction work nearby. During <br /> exploratory excavation to locate septic tank #2, a representative of Granite <br /> j- Construction informed Clayton that they had destroyed the septic tank during recent <br /> construction to widen MacArthur Drive. Fuel Oil Polishing excavated the area of the <br /> _. - - <br /> f septic tank to confirin its destruction <br /> Mr. Gregory Olivera, San Josquin County Public Health Services, Environmental <br /> I Health Specialist; observed field activity and stated that, based on the findings, the <br /> . f <br /> 6. septic tank issue could be officially closed. <br /> 10 <br /> s�soo•oG.p <br /> lli�lil�l(f <br />