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T s * Additional Site Assessment Work-Plan r �. <br /> LANGSTON'S MARKET 67 `r _x <br /> i 1 15615 South:?"` Street, Iathrop,KCallforma - <br /> 3 `s <br /> s 1.0: INTRODUCTION <br /> At.the request of Mr"-James LangStort; Advanced GeoEnvironmental;�Iri_c.�(AGE) has.prepared the =r w <br /> enclosed. Work Plan for'the;Lan ston's-lvlarket site located at 1.5615 South J!- Street; Lathrop.. <br /> p California.Theaocation of the site is.illustrated on Figure l-x Location.Map A-plan-,of the•site-is <br /> .. " <br /> A illustrated on Figure 2 Site-Plan <br /> This Work Plan has:been prepared as required by the'San Joaquin:County,Public Health Services =s <br /> r `Envirorimental Health .Division PHS-EHD to evaluate an unauthorized release of etroleum,. r. <br /> ( ) p , - . <br /> hydrocarbon.compounds from''an-underground storage tank {UST).formerly aacated at the site:. <br /> Additionally,-.tiiis workplan is prepared in ac&0i:dance.with-PHS'-EHD and Central Valley,Regional., <br /> u" Water Quality Cdritrol Board (CVRWQCB) guidelines for,the investigation of UST-'sitcs <br /> F The purpose of this additional site asse5srnent is to complete the evaluation of the,:l,ateral and vertical v `; <br /> `extent of petroleum"liydrocarbori-impacts to,. oil,'and gfouridwater at t1ie, sfte "Chis Work Plan <br /> provrdes'a description of the-scope of woik and procedures to be used in soil proe borings; soil ,rand.. <br /> groundwater sample collection and analysis,artd soil boring abandonment ' <br /> 2A. BACKGROUND <br /> t <br /> Y — — <br /> _` ° Compleie�backgt6ifhd information and deta�Is°of previous tnvestrga'ion at the site rs iricludecl.in the <br /> report titled Interim Secondary Sour-ee Removal and M it6r'i g*ell Replacement, dated 05 October <br /> 1995-and:'several Qircn terly Reports, prepared by VVHF,::Inc. Based.upon,information in these <br /> reports; itis AGE s undersianding`tliat,in.June 1990;�follo�ving aihelium pressure test; a 4,000'gallon '1 <br /> gasoline 'US i� `faded= and 'approximately 1,2x0 `gallons of unleaded: 'gasoline were ,released: <br /> Approximately 4500 tons of impacted soil were removed to depths of approximately 15:5 feet below a a <br /> surface grade (bsg). ;Between:April='19.92 and 'March 1998-eight soil bor�ngs`ivere..advanced.to <br /> depths of.17 feer:below surface-grade (bsg) Six .orings.were advanced to depths between-34 arid:."� <br /> 36.5=feet bsg four_of which"Were-coinpleted as;ground'ater.nionitoring wells{ W 1_through MW-'. <br /> E On 12-March 1998,WHF, Inc: and HKN1_Envrronniental,,lric. conducted field measurements, well <br /> r purging and".groundwater-8ainpliiig oiithe four gioutid�vater monrtoritig wells at'this site. Analytical Y' <br /> data froin'previous investigations and quarterly_rrionitoring indicate the groundwater contamination <br /> across thexsite lias di�iriished frorri previous sampl:iilg events'; possibly-due-to ,'stabilization"of the. <br /> a _ <br /> petroleurri hydrocarbon plume. Additional. •investigation rs,_required"t'Q complete the delineation of <br /> - inpacted.soal al)d groundwater and prepare f6t-clo'sure3 <br /> _. - i � .s-• R ,f T ' `� R'�- psi - 1 - <br /> Adtia ed GeoEni'ironniental,Inc <br /> '- -- - x ' -•Y-r ° `'' G: .ice _ _ -`e..• <br />