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<br /> i�RaY,y
<br /> CI(APTER 1
<br /> INTRODUCTION
<br /> On May 24 3984. a broken
<br /> PC On
<br /> Company (ARCO tank leak detector Benjamin bolt Drive i ) Service station 2133 at ARCA Petroleum
<br /> -leak from n Stockton, California located at 2908
<br /> the underground Stora resulted in a
<br /> amount of gasoline storage tank
<br /> system.
<br /> gasoline
<br /> Gettle£--Ryan lost are between Estimat,�s of the
<br /> unde • Inc_ (GR) jr and Emeon 2,000 and 3,200
<br /> underground tanks and surrounding A sociaw Q_ s EMCON gallons.
<br /> all Piping, and
<br /> s g soil � --) voted the
<br /> g eantamination installed new tanks
<br /> operated a remedial-actp,an at Cie site �, tested
<br /> involvement at and recover and installed and
<br /> 1987 this site was terminated b System, GR
<br /> ARCC retained Brown and Caldwell by ARCO, and and EMCON's
<br /> OE the Contamination (BC) to in late January
<br /> the site to xnatxon at the site investigate the
<br /> acceptable and to prepare std-us
<br /> a plan to clean `r.tp
<br /> Previous In v eesti ations
<br /> GR and EMCON inst,
<br /> site. The system consisted and operated the
<br /> wells and a of a number of Lecovery system on
<br /> free recovery well groundwater rrronitoring
<br /> Floating product a equipped with u petrapur9e u
<br /> The recovery system worked a hydropurge P mP to remove
<br /> Shallow a to pull Pump to remove groundwater.
<br /> aquifer toward the recovery groundwater and product the
<br /> from the recover The fluid was ,from
<br /> product was recovered elI to a Separator tank t�'-n pumped
<br /> was thea disc The groundwater , where free floatin
<br /> discharged into the municipal Pumped from the g
<br /> P l sanitar recovery well
<br /> A plat Y sewer system.
<br /> is plan of the site
<br /> shown an Figure 1_2. including underground
<br /> wells (E_2 throu The locatigns utility locations
<br /> and the recover gh F-12) , backfill °f groundwater monitoring
<br /> y.well are shown on monitoring wells (A, B, C, and U ,
<br /> E'igure 1-3-
<br /> The details of their i if
<br /> shown in the nvestigati-on and of the
<br /> by EMCON for Remedial Action Evaluation report, Tecover r
<br /> GR (ApF.9 dix A} , A Y sy„tem are
<br /> P
<br /> roduct were recovered b Pproxxmate Y 600 gallons
<br /> 1956, Prepared
<br /> gallons of Produci recav red e Sys in addition to lions of floating
<br /> underground s during excavation an estimated 500
<br /> forage tanks, and l
<br /> repacement of
<br /> �. the
<br /> Following the removal o
<br /> PunaP was reMOVed from th £ most floating product
<br /> remove water containin e recovery well. The the petrcpurge
<br /> water into g dissglved h System canti.nued to
<br /> the. . r,,unicipal ydrocarbons and to dischar
<br /> discharge permit sanitary Sewer ge that
<br /> Control 1'aci3it was issued by the Sys tem.
<br /> A wastewater
<br /> Y in August 1984- The permit expired Regional
<br /> August Wastewater,
<br />
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