SITE INFORMATION AND CORRESPONDENCE

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*-P"TABLE 1 - CHECKLIST OF REQUIRED DATA-' FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Dolly Madison/Langendorf Bakery, 1426 S.Lincoln St., Stockton, San Joaquin County (RB#390279) Y 1. Distance to production wells for municipal, domestic, A 1997 and a 2000 sensitive receptor survey identified no agriculture, industry and other uses within 2000 feet of the site. supply wells located within 2000'of the Site. Y 2. Site maps, to scale, of area impacted showing locations of In July 1988, one 1,000-gallon gasoline UST was removed any former and existing tank systems, excavation contours and from the Site. A second deeper MTBE release from an sample locations, boring and monitoring well elevation offsite source exists at this Site. The UST release at e th contours, gradients, and nearby surface waters, buildings, subject site did not contribute significantly to the streets, and subsurface utilities; comm/n led plume. Y 3. Figures depicting lithology(cross section), treatment system Site lithology consists of clay, silt, sand and gravel to diagrams; 120'bgs, the total depth investigated. N 4. Stockpiled soil remaining on-site or off-site disposal(quantity); The fate and volume of the excavated soil are not discussed in the available documents. Y 5. Monitoring wells remaining on-site, fate;. Twenty four monitoring wells(MW-1 through MW-19, and SGW-1 through SGW-5), and ten remediation wells(VW-1 through VW-6, and AS-1 through AS-4) were properly abandoned on 23 March 2011. 6. Tabulated results of all groundwater Depth to groundwater varied from 17'to 25'bgs. Groundwater flow elevations and depths-to water; _ direction varied from southeast to northeast. Groundwater gradient -varied from 0:001-to 0.004 ft/ft- 7. Tabulated results of all sampling All data adequately tabularized in various reports, including closure report. and analyses: Detection limits for confirmation sampling �Y Lead analyses 8. Concentration contours of contaminants found and those remaining in soil and The extent of the identified contamination shown in applicable groundwater,.and both on-site and off-site: reports. E]Lateral and ElVertical extent of soil contamination Lateral and FlVertical extent of roundwater contamination 9. Zone of influence calculated and assumptions used for subsurface remediation Soil vapor extraction and air sparging, system and the zone of capture attained for the soil and groundwater remediation were the engineered remediation. system; 10.Reports/information YUnauthorized Release Form a QMRs 3/97 to 10/10 �Y Well and boring logs ❑Y PAR Y FRP Other Closure Report(11-10) Y 11.Best Available Technology(BAT) used or an explanation for not UST removal, SVE/AS, and natural attenuation. using BAT, Minor residual soil and groundwater contamination remains on-site. 12. Reasons why background wa Y ttainable using BAT, 13.Mass balance calculation of substance treated The consultant estimates 11221bs of TPHg were present prior to y remediation and 1086 lbs of TPHg were removed from soil. versus that remaining; idual TPHg in soil Y 14. Assumptions, parameters, calculations and A 2008 soil vapor survey passed the Region 2 commercial vapor ESLS model used in risk assessments, and fate and exceededPA CHHSLs. Prior to rem the gross contamination eand directs exposure and benzene transport modeling; exceeded direct exposure ESLs, but residual soil is located below 9' b s. Y 15. Rationale why conditions remaining at site Soil and groundwater contamination reportedly is limited in extent. will not adversely impact water quality, health, or Land use future. Vaporintrusion)and soil is not risk hasected been addressed.o change in the Water foreseeable quality other beneficial uses;and oats will be reached in 2011. By: JLB Comments: In July 1988, one 1,000-gallon gasoline UST was removed from the subject Site. Based upon 45 quarters of groundwater monitoring showing a stable plume with declining concentrations, no threats to tent of contamination remaining in soil and groundwater from this release, no Date: nearby wells, the limited ex threatsed this 4/26/2011 foreseeable changes Regional Board staff limit end UST case closure. from groundwater, soil and soil ease vap reco