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TAGe6 1 - CHECKLIST OF REQUIRED BATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Cardoza Enterprises, 1151 W. Louise Avenue, Manteca,San Joaquin County 1. Distance to production wells for municipal, domestic, agriculture, Due to the fact that this was a contaminated soils-only industry and other uses within 2000 feet of the site; site,a sensitive receptor survey was not required. Y� 2. Site maps, to scale, of area impacted showing locations of former and existing tank Analysis of one soil sample systems, excavation contours and sample locations, boring and monitoring well revealed MtBE beneath a gasoline elevation contours, gradients, and nearby surface waters, buildings, streets, and dispenser during an upgrade on subsurface utilities; 11/12/2002. Ell 3. Figures depicting lithology(cross section), treatment system diagrams; Site lithology consists of sand and clayey sand to 24 feet, the total depth investigated. iD 4. Stockpiled soil disposed off-site(quantity); The amount of soil removed during the dispenser upgrade was not reported. 0 5. Monitoring wells remaining on-site, fate; Monitoring wells were not required or installed. 0 6. Tabulated results of all groundwater elevations and depths to water, Groundwater was encountered in borings at 22 feet. 7.Tabulated results of all sampling and analyses: Maximum analytical result of the dispensers upgrade soil samples 8collected Detection limits for confirmation sampling in 11/02 was:MtBE, 0.09 mg/kg. In 5104,all soil and grab groundwater analyses were reported as ND for 3 borings. Lead analyses YE 8. Concentration contours of contaminants found and those remaining in soil d groundwater, both on-psite and off-site: The confirmation soil samples and on-site Y Lateral and Y Vertical extent of soil contamination soil borings define the extent of soil Lateral and Vertical extent of groundwater contamination contamination. 9. Zone of influence calculated and assumptions used for subsurface Based on the limited extent of soil remediation system and the zone of capture attained for the soil and contamination,an engineered remediation groundwater remediation system; system was not required. 0 10.Reports/information IT] Unauthorized Release Form ❑ QMRS Y❑ Boring logs N❑ PAR N❑ FRP Y❑ Other Soil and Groundwater Investigation, Report 11.Best Available Technology(BAT) used or an explanation for not using BAT, Soil excavation and natural attenuation. 12.Reasons why background wasps unattainable using BAT, Minor soil contamination remains on-site. N� 13.Mass balance calculation of substance treated versus that remaining; Mass balance was not calculated for soil. N� 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling;and A risk assessment was not required. 15. Rationale why conditions remaining at site will not adversely Soil contamination is limited in extent. Y impact water quality, health, or other beneficial uses. By: Comments: In November 2002,soil samples were taken beneath dispensers during upgrades at the subject J,B site. The maximum analytical result of one of the soil samples collected was:MtBE, 0.09 mg/kg. Subsequently in 5104, an investigation reported no contamination in soil and grab groundwater sampled from Date: 11/3/04 three borings. Groundwater was encountered at 22 feet bgs. Based on the limited extent of the remaining soil contamination,Regional Board staff concur with San Joaquin County's Closure Recommendation.