SITE INFORMATION AND CORRESPONDENCE

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TAB�e1 - CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Stockton Golf and Country Club,3800 Country Club Boulevard,Stockton,San Joaquin County Y 1.Distance to production wells for municipal,domestic,agriculture, A well receptor survey completed In August 2000 did industry and other uses within 2000 feet of the site, not Identify any water supply wells within 2,000 feet of the site. a2. Site maps,to scale,of area impacted showing locations of former and existing tank systems, Three 1,000-gallon USTs excavation contours and sample locations,boring and monitoring well elevation contours, (gasoline,diesel,and oil and gradients,and nearby surface waters,buildings,streets,and subsurface utilities, gasoline)were removed In August 1990. Y� 3.Figures depicting lithology(cross section),treatment system diagrams, Boring logs show clay to 10 feet,and sandy silt to 25 feet the total depth explored. 0 4. Stockpiled soil disposed off-site(quantity); Approximately 8 cubic yards of soil was stockpiled and sampled during UST removal. Soils were likely returned to the tank pit a5.Monitoring wells remaining on-site, fate; Fops monitoringite rell s remain on-site. The wells will be properly destroyed Y 0 6. Tabulated results of all groundwater elevations and depths to water; Groundwater levels varied from 3 to 8 feet below ground surface,and flow Is to the northeast 7.Tabulated results of all sampling and analyses: Groundwater monitoring results for the Second Quarter 2001 are non- El Detection limits for confirmation sampling detect for all constituents Including MtBE and other fuel oxygenates at acceptable detection limits. Soll samples collected during UST F1 Lead analyses removal/n August 1990 reported lead at<5 mg/kg. Y 8.Concentration contours of contaminants found and those remaining in soil and groundwater,and both on-site and off-site: The lateral and vertical extent of sol/and Lateral andY❑ Vertical extent of soil contamination groundwater contamination has been © Lateral and Y❑ Vertical extent of groundwater contamination defined. 9.Zone of influence calculated and assumptions used for subsurface Based on the limited soil contamination, Qremediation system and the zone of capture attained for the soil and and no groundwater contamination,site groundwater remediation system, remediation was not required. Ya 10.Reports/information El Unauthorized Release Form Y❑ QMRs(5100 to 2/01) © Boring logs r--1 PAR N❑ FRP Y❑ Other(Well Installation Report, 8/2000) Y� 11.Best Available Technology(BA 7)used or an explanation for not using BA T, The USTs were removed. The remaining contamination will naturally degrade. sores why LWAVOer Immms $011 and�ro�r contamination remains in the tank pit aria. The —.-usingBAT, nema i!ng`contsmination Is limited in extent and does not present a significant threat to water quality. 13.Mass balance calculation of substance The mass balance calculations show that approximately 70 pounds of treated versus that remaining; contaminated soil remains at the site. M.Assumptions,parameters,calculations and model used in risk Based on the limited extent of contamination,a risk assessments,and fate and transport modeling; assessment was not required. Ya 15. Rationale why conditions remaining at site will not adversely Remaining contamination Is limited in extent impact water quality,health,or other beneficial uses;and Contamination will naturally degrade. By: Commen s: The site is cumendy a golf course maintenance yard. Three USTs were removed in August 1990,and MI replaced with above ground storage tanks. Soil contamination was identified during tank removal activities,and five soil borings and four monitoring wells were installed. Soil contamination was identified at 10 to 25 feet in one boring. Four quarters of groundwater monitoring showed TPHd at a maximum of 4,100 W4 in one monitoring event,'however, Date: subsequent sampling did not confirm this detection. No water supply wells were identified within 2,000 feet of the site. 9/7101 Based on the site investigation completed to date and the lack of groundwater contamination,Board staff concur with San Joaquin County's closure recommendation.