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TAME 1 - CHECKLIST OF REQUIRE0%dATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES Site Name and Location: Reynoso Concrete Construction Company, 729 S Commerce Ave, Stockton, San Joaquin Co. FY__1 1.Distance to production wells for municipal, domestic, agriculture, industry This area is on municipal water and sewer. and other uses within 2000 feet of the site; No known wells in the area. 0 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, 3 mon. wells installed,and excavation contours and sample locations, boring and monitoring well elevation contours, sampled in 6 events. gradients, and nearby surface waters, buildings, streets, and subsurface utilities; Gradient and flow direction has been variable. ED3.Figures depicting lithology(cross section), treatment system diagrams, Boring logs for 3 mon well installations near the tank pit were provided. 0 4. Stockpiled soil remaining on-site or off-site disposal(quantity); 1023 short tons of soil removed from site and areated at off-site location. Contaminant concentrations in aerated soil to ND. 0 5. Monitoring wells remaining on-site, fate; 3 monitoring wells remain on-site,however all three wells will be properly destroyed per SJC-EHD requirements,after receiving RWQCB closure. 0 6. Tabulated results of all groundwater elevations and depths to water,- Info is present in Qtr Mon Rpts, which were viewed at SJC-EHD fabulated� results of all sampling and analyses: UY All sampling results are presented in a tabular format.Elevated Detection limits for confirmation sampling detection limits were present for TPHg for a few samples. ❑Y Lead analyses Q8. Concentration contours of contaminants found and those remaining in soil Soil contamination is defined in the vertical and groundwater, and both on-site and off-site: and lateral directions by soil borings and 0 Lateral and ❑Y Vertical extent of soil contamination excavation sampling. Water sample results from the wells provide adequate control on EY Lateral and nN Vertical extent of groundwater contamination the groundwater contamination. NA 9.Zone of influence calculated and assumptions used for subsurface FNA remediation system and the zone of capture attained for the soil and groundwater remediation system; 0 10.Reports/information 0 Unauthorized Release Form a QMRs(Dates) most recent 6116198 mon event Y❑ Welland boring logs H PAR [N] FRP FY1 Other(report name)Site Investigation/Characterization Rpt 0 11.Best Available Technology(BAT)used or an explanation for not using BAT; Overexcavation activities were completed early on, and this appears to be appropriate NA 12 Reasons why background was is unattainable using BAT; 0 13.Mass balance calculation of substance treated versus that remaining; No Mass balance calculation was performed on soil or water contam.left in place NA 14.Assumptions,parameters, calculations and model used in risk assessments, and fate and transport modeling; 15.Rationale why conditions remaining at site will not adversely Soil was excavated to maximum extent feasible, wells impact water quality, health, or other beneficial uses;and were placed to evaluate GW impact.Data indicate impact in vicinity of MW-1, with low conc at MW-2&MW-3 NA 16.WET or TCLP results By;/y Comments: Concentrations of TPHg in groundwater are higher than I would like to see, however, the contamination appears to be centralized on MW-1 and not moving significantly. Groundwater contamination is likely associated with Date: the remaining soil contamination that was not removed in the bottom of the 32'deep excavation. Benzene and MTBE `,1D/97 are not reported above the reporting limits of the respective analyses. Site does not appear to pose a sig threat as