SITE INFORMATION AND CORRESPONDENCE

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i -- f TABLE 'I - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Arco Station#2076, 800 Kettleman Lane, Lodi, San Joaquin County 1. Distance to production wells for municipal, domestic, agriculture, industry and 2,000 ft SE of site j other uses within 2000 feet of the site; Q2. Site mans. to scale. of area impacted showing locations of former and existingartk_systems. 280-gal waste oil removed, excavation contours and sample locations. boring and monitoring well elevation contours. (2)4,000, (2) 6,000&10,000- , dients_ and nearby surface waters, buildinn streets, and subsurface utilities; gal unleaded gas tanks removed 1988 and 1991 3.Figures depicting lithology(cross section), treatment system diagrams; cross-sections:silty sand(some coarse mostly tine to medium)/sandy clayey slit Q 4. Stockpiled soil remaining on-site or off-site disposal(quantity); disposed at Harvey Bimdt,2050 Victor Rd.,Lodi 8,500 mg/kg TPH g and BTEX retumed to tank cavity 0 5. Monitoring wellsre remaining on-site, fate, 4 ir�onitaririg tivells need to be destroyed` "� "� "" ""� 0 6. Tabulated results of all groundwater elevations and depths to water, 50.07 to 54.50 ft bgs NW direction 0.02 gradient 10190 perched GW encountered at 30 ft bgs 0 7.Tabulated results of all sampling and analyses: Lead 52 mg/kg soluble lead 2 mg/l FYI Detection limits for confirmation sampling DLead analyses 8. Concentration contours of contaminants found and those remaining in soil Soil Contamination:beneath tanks,product and groundwater, and both on-site and off-site: pipe line, &dispenser island extends i N Lateral and FNJ Vertical extent of soil contamination beyond B1 &B3 to 36 ft bgs Lateral and N Vertical extent of groundwater contamination NA 9.Zone of influence calculated and assumptions used for subsurface FNA remediation system and the zone of capture attained for the soil and groundwater remediation system; 10.Reports/information ❑Y Unauthorized Release Form 9/8/88 12/4/91 ❑Y QMRs(Dates) 4/27/93 to 5/12/97 E] Well and boring logs El PAR 6/26/92 E]FRP a Other(report name) 0 11.Best Available Technology(BAT) used or an explanation for not using BAT, Removed tanks&pipelines,n - Q12.Reasons why background wasfis unattainable using BAT; Remaining soil contamination not impacting GW, GW ND for petroleum contaminants a13.Mass balance calculation of substance treated versus that remaining; Q14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling; Q15.Rationale why conditions remaining at site will not adversely All monitoring wells ND for petroleum contaminants& impact water quality, health, or other beneficial uses;and MTBE since 10/92. 0 16.WET or TCLP results By� Comments: Residual soil contamination:beneath tanks 6-31 ft bgs, laterally to B-1, B-3&beneath station bldg,.maximum concentration of 310 mg/kg TPH-g,0.29/1.4/1.6/17 mg/kg BTEX 11 ft bgs.Beneath leaking D t pipe/dispenser island 11-36 ft bgs,maximum concentration of 1.1 mg/kg TPH-g, 0.024 mg/kg Xylene(36 ft), Q 0.012/0.015/0.005 mg/kg BTE(11 ft). GW nondetect for petroleum contaminants ND for MTBE..