Laserfiche WebLink
r Y <br /> tm10r1rA13LE,1 -CHECKLIST OF REQUIRED DAT <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: Bernard Weaver Trucking,777 Locust Street,Ripon,San Joaquin County <br /> 0 1. Distance to production wells for municipal, domestic, agriculture,industry The closure summary does not include a well <br /> and other uses within 2000 feet of the site; survey. San Joaquin County indicates that the <br /> waste oil release does not affect drinking water <br /> wells. <br /> 2. Site maps, to scale, of area impacted showing locations of former and existing tank systems, In June 1991,a 750-gallon waste <br /> excavation co.Ontours and sample locations, boring and monitoring well elevation contours, oil tank was removed from the <br /> gradients, and nearby surface waters,buildings,streets, and subsurface utilities, Sri" <br /> 3. Figures depicting lithology(cross section), treatment system diagrams, No treatment system was used. <br /> 0 4. Stockpiled soil remaining on-site or off-site disposal P 9 p (quantity);. <br /> NA 5. Monitoring wells remaining on-site, fate; No monitoring wells were installed.. <br /> I <br /> '� "" Groundwater was encountered-at 21 feet bgsthe------,during <br /> 6. Ta6u/ated results of all groundwater"" "elevations"""� and depths to wafer; advancement of one investigative soil boring. <br /> After the waste oil tank was removed,290 mg/kg of hydrocarbons were <br /> 7. Tabulated results of a!1 sampling and analyses: detected in soil samples from the tank excavation. BTEX was not detected. in <br /> Detection limits for confirmation sampling 1999,soil and groundwater samples were analyzed for TPHg, TPHd,BTEX,and <br /> N�Lead analyses MtBI=using EPA Method 8020. San Joaquin County stated that MISE <br /> L_ 1 detections would have been confirmed with Method 8260. No contaminants <br /> associated with the UST release were detected in the samples. <br /> 0 8. Concentration contours of contaminants found and those remaining in soil <br /> rand groundwater, and bothnn-site and off-site: <br /> U Lateral and I Vertical extent of soil contamination <br /> 0 Lateral and F1 Vertical extent of groundwater contamination <br /> NA g Zone of influence calculated and assumptions used for subsurface No subsurface remediaSon system was used at <br /> remediation system and the zone of capture attained for the soil and this site. <br /> groundwater remediation system; <br /> � NA - <br /> 10.Reports/information` Unauthorized Release Form MRs(Dates) <br /> Welland boring logs EIPAR NA FRP Other(repos:name)4 October 1999 Closure Summary <br /> 11.Best Available Technology(BAT)used or an explanation for not using BAT, The leak sources were removed from the site. <br /> —^ Contaminants from.the-UST.release,were not detected In soil and <br /> 12.Reasons'why backg`ro'und'was<s unattainable using Bp T;�`�-'-° c- f <br /> groundwater samples during the 1999 subsurface investigation. <br /> 0 13.Mass balance calculation of substance treated versus that remaining; <br /> NA 14.Assumptions,parameters, calculations and model used in risk <br /> assessments, and fate and transport modeling; <br /> . Y <br /> 15.Rationale why conditions remaining of site will not adversely <br /> impact water quality,'health, or other beneficial uses;and <br /> N <br /> 16.WET or TCLP results <br /> Dy; Comments: in 1991,elevated levels of TPH were detected in soil samples after the removal of the'waste oil UST. in 1999,a single <br /> GeoprobeO was advanced in the center of the former USTpit to 21 feet bgs. Soil and groundwater samples were analyzed for <br /> Det TPHd, TPHg"BTEX, and MtBE. No contaminants above detectable limits were detected in the samples. Based on the information <br /> I provided and the absence of contaminants during Geoprobe®investigation, staff concurs with San Joaquin County closure <br /> recommendation. <br />