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NEIL O. ANDERSON <br /> ' <br /> AN D ASSOCIATES <br /> ' A1rC,frc7C0n COMPANY <br /> SITE VISIT/OBSERVATIONS <br /> DW-1 <br /> PLATE 8 <br /> ' Project Name NOA Drywell Closure Inspection Date 03/28/2014 <br /> Job Number LZV140001 Field Work Time 07:00— 19:00 <br /> Street Industrial Way City Lodi, CA <br /> Client NOA Contact 209.367.3701 <br /> YES ❑ NO ®(Use back of <br /> Geologist Heather Shaddox Additional Info form) <br /> SUMMARY OF SITE OBSERVATIONS: <br /> Purpose of site activities are to close (2) on-site drywells used for Fog Curing Concrete Sy7activitles <br /> ells <br /> will be destructed by overdrilling. Soil and groundwater sampling will be performed in theells, <br /> starting 1-2 feet below the vertical extent of the wells. Well destruction and samplill beperformed in accordance with the Revised Drywell Closure and Investigation Work Plan, d014 <br /> and revised March 20, 2014, prepared by NOA. <br /> ' Destruction and sampling of the western well (DW-1) was performed first on March 28, 2014. The well was <br /> over-drilled using a 12-inch hollow stem auger until 47 feet bgs. Depth of casing was determined to be 40 feet <br /> bgs. At 47 feet bgs, switched to 8-inch hollow stem auger. Soil sampling sleeves and groundwater containers <br /> were pre-chilled in ice chests. Borehole logs were taken once soil sampling began and logging of native material <br /> was possible. The first soil samples were taken at 51 feet bgs ("131@51'-I" and "B1@51'-II'D using the 8-inch <br /> hollow stem auger. Soil samples were then taken every 5 feet until groundwater was encountered. Soil samples <br /> were collected at 55 feet bgs ("Bl@55'-I'� at 60 feet bgs ("BS@60'-I", "131@6W-II-A"'"B1-60'-II-B'O, and at 65 <br /> feet bgs ("61-65'-I'�. In general, the soil samples from the bottom of the sampler were collected because those <br /> contained the most sample. Groundwater was first encountered at 65.5 feet bgs. Groundwater sample"WS-I" <br /> was collected to be analyzed for VOCs. Groundwater pH, temperature, EC,TDS, and DO were analyzed using a <br /> field meter.There was not enough groundwater to collect further groundwater samples.Therefore, drilling with <br /> the 8-Inch hollow stem auger continued until groundwater was encountered again. Soil samples were taken at <br /> 70 feet bgs ("131@70'-I'� and 75 feet bgs ("131@75'-I'�. Groundwater was encountered again at 75 feet bgs. pH, <br /> temperature, EC, TDS, and DO were also measured at this depth. The following groundwater samples were <br /> collected: "Wl-II"for RCRA metals,"Wl-III"for TPH-Gas, "Wi-IV"for TRPH,"WI-V"for TPH-Diesel, and"WS- <br /> VI" for Semi-VOCs. An equipment blank for soil sampling was taken ("EB-S") as well as one for groundwater <br /> sampling ("EB-W'�. A replicate sample was additionally taken during soil sampling and split between two <br /> ' identical containers, labeled: "Bl@60'-II-A" and "131@60'4I-13". The replicate sample for groundwater will be <br /> collected from the eastern well (DW-2).The western well was then grouted using Portland Cement Type II/IV. <br /> Only the destruction of DW-1 was completed on March 28, 2014. The eastern drywell (DW-2) was covered to <br /> prevent storm water from running into the well. A full 55-gallon drum was placed on top of a piece of plywood <br /> with a bentonite seal around it, which covered both wells. The destruction and sampling of DW-2 will be <br /> performed the following week March 31-April 4 2014 weather permitting. <br /> Inspector Signature <br /> LODI • SACRAMENTO • CONCORD <br /> CORPORATE 902lndustrial Way • Lodi,CA 95240 • 209.367.3701 • FAX 209.333.8303 <br />