SITE INFORMATION AND CORRESPONDENCE_CASE 2

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` I -CHECKLIST OFREQUIRED DATA FOR NO FURTHAC TION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: f=ive Star Marina(Fast), 345 N. Yosemite St., Stockton, San Joaquin County(RB#390918) y 1. Distance to production wells for municipal, domestic, A 2009 sensitive receptor survey reported no active agriculture, industry and other uses within 2000 feet of the site. supply wells within 2,000'of the site. Y 2. Site maps, to scale, of area impacted showing locations of In 11/97, one 4,000-gallon gasoline USTs and associated any former and existing tank systems, excavation contours and dispenser and piping were removed. sample locations, boring and monitoring well elevation contours, gradients, and nearby surface waters, buildings, streets, and subsurface utilities; Y 3. Figures depicting'lithology(cross section), treatment system Site 1lthology consists of clay, silt and sand to 40', the diagrams; total depth investigated. N 4. Stockpiled soil remaining on-site or off-site disposal (quantity); The fate of the excavated soil was not discussed-in the available reports. }( 5. Monitoring wells remaining on-site, fate; Nine(9)monitorin wells(MW-5 through MW-13) will be properly abandoned. 6. Tabulated results of all groundwater Depth to grow dwater varied from 5'bgs to 9'bgs. Groundwater gradient elevations and depths to water, varied from 0. 2 ft/ft to 0.004 ft/ft. Groundwater flow direction varied clockwise fro south to northwest. 7. Tabulated results of all sampling All data adequately tabu rized in various reports,including closure report. and analyses: 0 Detection limits for confirmation sampling 1 Lead analyses 8. concentration contours of contaminants found and those remaining in soil and The extent of the identified groundwater,and both on-site and off-site: contamination is described in the available reports. 0 Lateral and El Vertical extent of soil contamination - Lateral and nYVertic4l extent of groundwater con amination 9. Zone of influence calculated and assumptions used for subsurface remediation An engineered remediation was not system and the zone of capture attained for the soil and groundwat r remediation required by the regulatory agency. system; 10.Reports/information ❑Y Unauthorized Release Form QMRs 1/98 to 4/?1 FT] Well and boring logs E PAR FRP Other Closure Report(10-11) _LJ 11.Best Available Technology(BAT) used or an explanation for nol using UST removal and natural attenuation. BAT; 12. Reasons why background wasrs unattainable Minor residual soil and groundwater contamination remains on-site. Y BAT,, Y 13.Mass balance calculation of substance treated Consultant stimafes approximately 773 lbs of TPH remain in soil versus that remaining, below watei,table,and 3 lbs of TPH remain in groundwater. Y 14. Assumptions,parameters, calculations and Soil vapor id not exceed Region 2 Environmental Screening Levels 7 model used in risk assessments, and fate and (ESLs). Soil ESLs were exceeded for TPHg gross contamination and transport modeling; direct contact at confirmation sample locations for UST T1-W (11'bgs)and piping SP3-1,and for TPHg and MTBE below the water table at 10' gs. The consultant states no significant risk exists from vapor intrusion since residual mass is below water table, beneath Lindsay St, and adjacent to an open boat storage warehouse. Y 15. Rationale why conditions remaining at site will Soil and gr undwater contamination reportedly are limited in extent not adversely impact water quality, health, or other Land use( mmercial)is not expected to change in the foreseeable beneficial uses;and future. TPH is estimated to reach WQGs in 2018. By: JLB Comments:In 11/97, one 4,000-gallon gasoline USTs and associated dispenser and piping were removed at the subject site. Minor residual soil and groundwa er contamination remains on-site.Based upon the limited.. Date: extent of contamination reported in soil and groundwater, a stable groundwater plume with declining 11/28/2011 concentrations, no foreseeable changes in future j and use(commercial), and minimal risks from soil, soil vapor, and groundwater, Regional Board staff con twr with San Joaquin County's Closure Recommendation.