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w TAb E 1 - CHECKLIST OF REQUIRED*VATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Angelica Textile, 1145 Sierra Nevada Street, Stockton, San Joaquin County FiD 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. 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, excavation contours and sample locations, boring and monitoring well One 12,000-gallon diesel UST was elevation contours, gradients, and nearby surface waters, buildings, streets, and removed in 2/03. subsurface utilities; M3. Figures depicting lithology(cross section), treatment system diagrams; Site lithology consists of sandy silt to silty clay to 60 feet, the total depth investigated. 4. Stockpiled soil disposed off-site(quantity); The amount of soil removed during the UST removal was not reported. EE5. 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 first encountered at 55 feet and 60 feet below ground surface(bgs), but rose to 43 feet bgs in both borings. �Y 7. Tabulated results of all sampling and analyses: Maximum soil analytical results of UST confirmation soil samples Y collected in 2/03 were: TPHd, 6,100 mg/kg, and Xylenes, 0.008 mg/kg. Detection limits for confirmation sampling In 4/04,all soil and grab groundwater analyses were reported as ND for Ll Lead analyses 2 borings. y� 8. Concentration contours of contaminants found and those remaining in soil and groundwater, both on-site and off-site: The confirmation soil samples and on-site e Lateral andRN 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. FTJ 10.Reports/information 7] Unauthorized Release Form a QMRs El Boring logs El PAR N❑ FRP Other Preliminary Investigation and Evaluation Report 0 11.Best Available Technology(BAT) used or an explanation for not using BAT; Soil excavation and natural attenuation. Y� 12.Reasons why background was/is unattainable using BAT, Minor soil contamination remains on-site. 0 13.,Mass balance calculation of substance treated versus that remaining; Mass balance was not calculated for soil. 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling;and A risk assessment was not required. FE15. Rationale why conditions remaining at site will not adversely Soil contamination is limited in extent. impact water quality, health, or other beneficial uses. By: Comments: In February 2003, one 12,000-gallon diesel UST was removed from the subject site. Maximum JLB analytical results of confirmation soil samples collected for the UST removal were: TPHd, 6,100 mg/kg, and Xylenes, 0.008 mg/kg. Subsequently In 4/04, a soil and groundwater investigation reported no contamination Date: in soil and groundwater sampled from 2 borings. Groundwater was first encountered at 55 feet to 60 feet bgs, 9/22/04 but rose to 43 feet bgs in both borings. Based on the limited extent of the remaining soil contamination, Regional Board staff concur with San Joaquin County's Closure Recommendation.