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y TABLE 1 - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Chevron#90342, 1347 S. EI Dorado Street, Stockton, San Joaquin County -1 1.Distance to production wells for municipal, domestic, agriculture, industry and 9 wells within 1/2 mile other uses within 2000 feet of the site; FTI 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, 7 Tanks removed from 89-91 excavation contours and sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; 0 3. Figures depicting lithology(cross section), treatment system diagrams; Driller's logs NA 4. Stockpiled soil remaining on-site or off-site disposal(quantity); 600 cu yds aerated on-site and backfilled 15 cu yds hauled to Forward Landfill NA 5. Monitoring wells remaining on-site, fate; 4 wells installed 3 remain MW-1 covered over during construction of restaurant building y❑ 6. Tabulated results of all groundwater elevations and depths to water, 32 to 47 ft bgs 0 7.Tabulated results of all sampling and analyses: MDetection limits for confirmation sampling ny Lead analyses -1 8. Concentration contours of contaminants found and those remaining in soil Contamination essentially limited to the and groundwater, and both on-site and off-site: extent of the excavation. Initially yLateral and y MW-3 Some contamination migrated Vertical extent of soil contamination hydrocarbon contamination in MW-1 and y Lateral and y Vertical extent of groundwater contamination beyond MW-2 and MW-4. NA 9.Zone of influence calculated and assumptions used for subsurface remediation system and the zone of capture attained for the soil and groundwater remediation system; 0 10.Reports/information [N Unauthorized Release Form ❑y QMRs(Dates) 8190 to 11/96 Y] Well and boring logs H PAR ❑N FRP Other(report name) Y7 11.Best Available Technology(BAT)used or an explanation for not using BAT; Soil excavated to 20 ft bgs 0 12.Reasons why background wasfis unattainable using BAT,' Groundwater is ND for hydrocarbon contaminants. Residual hydrocarbons in soil will degrade,not at surface 0 13.Mass balance calculation of substance treated versus that remaining; 249 pounds TPH NA 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modefing; 15.Rationale why conditions remaining at site will not adversely Ground water contamination ND to low concentrations of impact water quality, health, or other beneficial uses;and hydrocarbons,No municipal wells within 1/2 miles. Most hydrocarbon contaminated soil removed. NA 16.WET or TCLP results By: Comments: San Joaquin County recommends no further action at this site, and Board Staff agree. A�_- D t :