Laserfiche WebLink
landfill. Ground water was reported to be about 56 feet below ground surface (bgs) in previous <br /> reports. The current (November, 2007) ground water level is about 45 feet bgs. <br /> The wells and the lysimeters are believed to be in good working condition. Two tenants, a <br /> granite countertop contractor and a trailer maker, are located at the north portion of the <br /> complex. <br /> The area of the previous impoundment (Fig. 1) will be drilled. A lead field kit shall be used to <br /> locate the extent of the waste, to guide drilling coverage. All borings should penetrate the waste <br /> (unless the boring is located beyond the waste boundary) and be completed in native soil <br /> beneath the waste. If a perimeter soil boring intersects waste, a step out boring is required until <br /> no waste is intersected. <br /> Proposed Boring, Sampling, Analyses, and Report <br /> 1. Boring: ACS will conduct grid soil borings in the vicinity of the landfill (impoundment). The <br /> grid is approximately 4 rows by 8 columns of bores at about 25 feet apart (assuming landfill <br /> is about 35 feet x 125 feet in plan view, per map in the 1996 monitoring report). Drilling to <br /> depths of 20 to 30 feet below ground surface, and samples shall be taken every 5 vertical <br /> feet. All borings should penetrate the waste (unless the boring is located beyond the waste <br /> boundary) and be completed in native soil beneath the waste. If a perimeter soil boring <br /> intersects waste, a step out boring is required until no waste is intersected. <br /> 2. Water samples of the soil bores: Representative water samples from bores that <br /> encounters ground water, shall be sampled for water analyses for total lead and other lab <br /> analysis as in the "groundwater sampling workplan". <br /> 3. Soil sampling procedure: The soil samples shall be screened by an organic vapor <br /> analyzer (OVA) in the field and analyzed for lead. One duplicate per 20 samples shall be <br /> obtained for soil analyses. <br /> 4. Analyses: About 60 soil samples shall be analyzed for total lead and up to about10 <br /> samples shall be analyzed for TPH organic compounds (method 418.1) according to OVA <br /> responses. <br /> 5. Sampling: At a minimum all bottom soil and all of the perimeter holes will be adequately <br /> sampled and analyzed. <br /> 6. Grouting and the Rig: All soil bores shall be grouted with bentonite or some other WQCB <br /> approved grout. The drilling rig used shall be a track-mounted Geoprobe or equivalent one, <br /> and the drilling shall be supervised by a registered Professional Geologist. <br /> 7. Report: A soil characterization report shall be written to present soil data and to discuss <br /> proposed remediation scheme and/or strategy, including preliminary costs for alternatives. <br /> We appreciate very much this opportunity to be of help on this project, and please feel free to <br /> contact us if you have any questions. <br /> Sincerely, <br /> Dr. Chi Huang <br /> Registered Professional Geologist, State of California <br /> © 2007 ACS Asso. 3 <br /> CharterWorkplan-Soil-RossA 121007a <br />