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WR 02 '90 16:02 AL7 of 1 GEC T ENCS -� F.2/5 <br /> AMENDMENT TO THE PROPOSED +. 1990 <br /> SCOPE OF WOM' Fop, <br /> SUBSURFACE INVESTTGATION- AND <br /> REMEDIAL PLANNING STUDY <br /> Mobil Oil Corporation <br /> Former Service Station 10-NP4 <br /> Tracy Boulevard and Grantline Road <br /> Tracy, California <br /> INTRODUCTION <br /> This amendment to the proposed workplan <br /> presented <br /> 23; 1990 to conduct a supplemental ste investigation ofon subsurface Contaminationand zemedial Planning study at the _ <br /> former Mobil Oil Station <br /> Tracy Boulevard and Graret10-Np4, located at the corner of <br /> lj,n :ad, Tracy, <br /> California <br /> specify the locations of theto <br /> amendment for the scope of 'work aposed monitoring wells�s The <br /> the results preliminar y � � y Proposed 'herein was based on <br /> date to deter ��te 117�--Stigation work completed to <br /> mine the extent o'' hydrocarbon contamination in <br /> the subzUr.face ground water. <br /> PRQJECT RACKGROUMD <br /> I <br /> Periodic ground water monitoring and sampling for the <br /> existing eight monitoring wells on- and offsite from April <br /> to present indicated the <br /> hydrocarbon cocontinued presence 0z' dissolved <br /> the site and tnstituents in the shallow ground water beneath <br /> he surrounding areas . Review of the reUults of <br /> the sampling events indicates that Che extent of e 'rLQ" : and <br /> offsite ground water contamination have not <br /> in the southern portion Of the site and the easternYet <br /> defined <br /> of 'the offsite portion. <br /> SCOPE 01r PROPOSED WORK <br /> The .proposed subsurface investigation <br /> in accordance with study will be conducted <br /> the San Joaquin applicable regulations and guidelines of <br /> County Public Health Services-Environmental <br /> Health Division (SJCEHU) and the , <br /> Water Quality Control Bogan Central Valley Regional. <br /> ground water contamination (oblC ., TO properly address the <br /> contamination lurne is problem., the ground water <br /> P to be defined. The definition of the <br /> Plume will require the installation o£ two additional wells . <br /> One well will be installed south of the site, where the other <br />