SITE INFORMATION AND CORRESPONDENCE

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ik 7 Sent By: RWQCB; 2553439; Nov-27(-- 11 :36AM; Page 3/3 r \—fABLE 1 -CHECKLIST OF REQUIRED DATA--f FOR NO FURTHER ACTION REQUESTS AT UNnERGRQUND TANK SITES i . i Site Name and Locatlon: Fowler's Auto Body,405 N.Edison Street,Stockton,San Joaquin County 'I NSpcause contaminants were not detected during 1,Distance to production wells for municipal,domestic, ult agricure,industry the soft and groundwater assessment a rooeptor and other uses within 2000,feel of the s0, survey was not conducted. 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, 1,8989,llo tanks removed 0 and P , g 4,800-gallon)were removed 1 excavation co.amours and sample locations, boring and monitoring well elevation contours, !ram the site. The contents of gradients, and nearby surface waters,buildings, streets, and subsurface utilities; the tanks wore unknown. i 3. Figures depicting litholegy(cross section), treatment system diagrams; Approximately 200 cubic yards of soil were backililed Into the 4. Stockpiled soil remaining on-site or off-site disposal(quantity). tank cavity. 5. Monitoring wells remaining on-site,fate; NO monitoring welts were installed. ' I b. Tabulated results of all groundwater elevations and depths;to wafer; Groundwater elevation varies from 10 to 20 feet bgs�with a northerly Row direction. In April 2040,elevated levels of TPH(purgeable)and TPP oft and low 7,Tabulated results of all sampling and analyses: concentrrdons s lof eth i benzene were detected In soft when the tanks were Detection limits for confirmation sampling remave& Twosofl borings were advanced at the site In August 2400. One Lead analyses boring was angled under the tank excavation. Soil and groundwater samples from the boring5 Were non-detect for an#fy;ed constituents,including fuel oxygenates. 8,Concentration contours of contaminants found and those remaining in soil i and groundwater. and both on-site and off-site; � Q Lateral and Vertical extent of sdil contaminatidn Lateral and pal Verfic:al extent of groundwater contamination 0 9, Zone of influence calculated and assumptions used for subsurface No remedlstion system was Installed. remediation system and the zone of capture attained for the Soil and groundwater remediation system; 10.Reports/informs flon I_J Unauthorized Release Form NA QMRs(Dates) !Neil and boring logs DAR NA FRP 0 Other(report name)Limited Soil&Grvundwafor Assessment Is 11.Best Available Technology(SA T)used or an explanation for not using BAT, The tanks were removed from the site. 12,Reasons why background was/is unattainable using BAT; I Minor contamination possibly remains In.soil. Q13.Mass balance calculation of substance treated versus that remaining. None submitted. 0 14.Assumptions,parameters, calculations and model used in risk assessments,and fate and transport modeling; I: 0 15.Rationale why conditions remaining at site:will hvl adversely Data shows that groundwater at the site was not impacted, impact water quality,health,of other berreficial uses;and L. ..J 16 WET or TCLP results is Comments, From the remarks in the closure summaiy,'iiit appears that the tanks were taken out of service in the 1970s. The property owner states that he was unaware of the tankswhen he purchased the property. when the tanks were removed In Date April 2000, TPH as high as 12,000 mg/kg and low concentrations of ethyl benzene were detected in soil samples. Toluene at ti i pgR wero delovivd to a grab groundwater sample front the pit. In August 2000,two soil barings were advanced around the tank excavation. 9oll and water samples from the borings we rC nor!-dCtoct- Bosod on the obsanco of grpundwoter contaminants,staff concurs with San Joaquin County ckwura recommendation.