SITE INFORMATION AND CORRESPONDENCE

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r r✓ `we TABLE 1 - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Holt Brothers, 1541 Charter Way, Stockton, San Joaquin County FNA 1.Distance to production wells for municipal, domestic, agriculture, industry and other uses within 2000 feet of the site; FYD 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, n;988ed 8 tanks from-site excavation contours and sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; NA 3. Figures depicting lithology(cross section), treatment system diagrams; TI 4. Stockpiled soil remaining on-site or off-site disposal(quantity); 6,000-8,000 cu yds remediated and spread on-site 5. Monitoring wells remaining on-site, fate; 9 wells installed,3 decommissioned, 6 remain 0 6. Tabulated results of all groundwater elevations and depths to water, 17 to 28-ft bgs © 7.Tabulated results of all sampling and analyses: FYIDetection limits for confirmation sampling nN Lead analyses Y� 8. Concentration contours of contaminants found and those remaining in soil Remaining contamination: multiple tank and groundwater, and both on-site and off-site: area soil-ND/0.022/0.2/0.5/2.8 mg/kg(TPH- FNJLateral and FNJ Vertical extent of soil contamination g,BTEX)groundwater ND for TPH-g,BTEX, FHVOCs and MTBE, 0.77µg/1 TPH-d. Waste Lateral and N Vertical extent of groundwater contamination Oil tank area soil-5,000 mg/kg TPH-d. 9.Zone of influence calculated and assumptions used for subsurface Aquifer test remediation system and the zone of capture attained for the soil and groundwater remediation system; © 10.Reports/information YM Unauthorized Release Form 5/31/88 [2MRs(Dates) 5/6/93 to 1/14/97 M Well and boring logs FYI PAR4/25/90 E FRP 0 Other(report name) PIER 10/6/92 Ya 11.Best Available Technology(BAT) used or an explanation for not using BAT,• Excavated soil to 34 ft-bgs,removed free product NA 12.Reasons why background warms unattainable using BAT, NA 13.Mass balance calculation of substance treated versus that remaining; NA 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling; 15.Rationale why conditions remaining at site will not adversely 5,000 mg/kg TPH-d is waste oil impact water quality, health, or other beneficial uses;and Groundwater low concentrations of TPH-d only NA 16.WET or TCLP results By.' Comments: The remaining groundwater contamination is very minimal (see comment 8). The soil 1W contamination is waste oil,which is not very mobile. This site is not a threat to human health or Dat the environment. Board staff concur with San Joaquin County.