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Former Countryside Market - 3 - • 8 August 2012 <br /> 10848 Copperopolis Rd., Stockton <br /> San Joaquin County <br /> reported 1,2-DCA above MCLs in the well water (25 ug/L) and after the owner's <br /> domestic well treatment system (7.8 ug/L). The10967 well owner stated they had <br /> purchased the property with a wellhead carbon treatment system in place (the prior <br /> owner was notified that the well was impacted with 1,2-DCA in 2000). The current <br /> owner stated the carbon unit that was overdue for maintenance and that they would <br /> have it replaced. The Report recommends additional investigative activities to further <br /> characterize the lateral extent of petroleum hydrocarbons impact to groundwater, <br /> changing the carbon unit at 10967 domestic well, and resampling said well quarterly. <br /> The Workplan proposed the installation of monitoring wells MW-6 and MW-7 and three <br /> soil borings (SB-1 through SB-3) spaced at 75' intervals along the opposite (north) side <br /> of Copperopolis Road from the Site. MW-6 and MW-7, constructed as 2-inch diameter <br /> monitoring wells with 20' long well screens, and SB-1 through SB-3 will be advanced to <br /> approximately 100' below ground surface bgs. Grab groundwater samples will be <br /> collected from SB-1 through SB-3. MW-6 and MW-7 will be sampled one week after <br /> installation. <br /> The Workplan was written in compliance with tasks in the Cost Estimate (TSGI, <br /> 31 July 2012) approved by my letter dated 31 July 2012, and is necessary and <br /> appropriate to investigate the release of petroleum hydrocarbons, and to assess <br /> potential human health risks to nearby domestic wells. The Workplan is approved, <br /> though implementation of the work is contingent upon funding availability and execution <br /> of the contract amendment for FY12-13. Please provide the San Joaquin County <br /> Environmental Health Department and myself at least 3 working days' notice prior to <br /> initiation of fieldwork, and contact me by phone at (916) 464-4614 or by email at <br /> ibartonewaterboards.ca.gov if you have questions or comments. <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> UST Enforcement Unit II <br /> cc: Pearl Cross, State Water Resources Control Board, UST Cleanup Fund <br /> Conrad Lewis, DGS, Real Estate Division, 707 3rd St., West Sacramento 95605 <br /> Nuel Henderson, San Joaquin County Environmental Health Department, <br /> Stockton <br />