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j TABLE I - CHECKLIST OF REQUIRED DATA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: City of Manteca Public Works,220 Oak Street, Manteca, San Joaquin County <br /> NA 1.Distance to production wells for municipal, domestic, agriculture, industry and <br /> other uses within 2000 feet of the site; <br /> 0 2. Site maps. to scale, of area impacted showing_loca&nss Q(former and existing tank systems. 8,000-gallon gasoline tank <br /> excavation contours and sam J2leJo0tiot sa boring and monitoring well elevation contours, removed in 7/92 This tank <br /> was found abandoned in <br /> gradients, and nearby surface waters. buildings. streets. and subsurface utilities; <br /> 9990. <br /> 3. Figures depicting lithology(cross section), treatment system diagrams; Geologic log of boring P-1 to 35 ft bgs <br /> 0 4. Stockpiled soil remaining on-site or off-site disposal(quantity); <br /> Stockpiled soil used to backfill the pit along with cement <br /> like road-base material. <br /> 5..Monitoring_wells remaining on-site,.fate;ri. <br /> B jLng backfilled with neat cemented using a tremie pipe. <br /> . �� - - <br /> a 6. Tabulated results of al/groundwater elevations and depths to water, 16 to 25 ft bgs 20 ft bgs <br /> 0 7.Tabulated results of all sampling and analyses: <br /> Y❑Detection limits for confirmation sampling <br /> ❑N Lead analyses <br /> YD S. Concentration contours of contaminants found and those remaining in soil Contaminated soil detected beneath north <br /> and groundwater, and both on-site and off-site: end of tank with 36 gg(kg toluene, 10µg/kg <br /> y Lateral andy Vertical extent of soil contamination ethylbenzene,55µg/kg xylene. GW from <br /> M!Y�Lateral and Y Vertical extent of groundwater contamination boring at 35 ft bgs had 5.0 ug1l MTBE. <br /> NA 9.Zone of influence calculated and assumptions used for subsurface <br /> FNA <br /> remediation system and the zone of capture attained for-the soil and <br /> groundwater remediation system; <br /> 0 10.Reports/information ❑N Unauthorized Release Form 0 QMRs(Dates) <br /> a Welland boring logs a PAR FRP R Other(report name) Closure Summary Rpt. 10/25/97 <br /> v r.Fy___j 11,Best Available Technology(BAT) used or an explanation'fornot using BA T. Tank removed,soil excavated,pit <br /> - backfilled with soil&"cohcrete <br /> 12.Reasons why background wash's unattainable using BAT,• No soil contamination found in boring from the surface to <br /> 35 ft bgs. GW had 5.0µg11 MTBE <br /> NA 13.Mass balance calculation of substance treated versus that remaining; <br /> NA 14.Assumptions,parameters, calculations and model used in risk <br /> assessments, and fate and transport modeling; <br /> 15.Rationale why conditions remaining at site will not adversely GW sample at 35 ft bgs had 5.0µgll MTBE only. Grab gw <br /> impact water quality, health, or other beneficial uses;and sample at 20 ft bgs nondetect for all petroleum <br /> contaminants,including oxygenates. <br /> NA 16.VV1=T or TCLP results <br /> By- Comments:Soil and ground water(gw) contamination remains. No petroleum contaminants <br /> detected in soil(surface to 35 ft bgs)and gw(at 20 ft bgs). MTBE may be due to another source of <br /> Dat contamination. The vertical contamination beyond 35 ft bgs, and the gw flow direction is unknown. <br /> The data may represent the edge of a larger plume or represent only minimal gw contamination. <br />