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Former Gardner Property - 2 - 30 April 2008 <br />26090 (AKA 26056) N. Thornton Rd Thornton <br />MW-7 will also be sampled for petroleum hydrocarbons before, during, and after the pilot study <br />per the proposed Workplan protocol. <br />In addition to groundwater sampling, MW-7 will be monitored for changes in water levels and <br />dissolved oxygen (DO) per the proposed Workplan protocol. If there is any indication that the <br />pilot study is affecting the petroleum hydrocarbon plume at MW-7 (changes in water levels or <br />increases in DO), then MW-7 will be sampled for petroleum hydrocarbons and the pilot test will <br />be shut down until the groundwater sample results show no petroleum hydrocarbons impacts <br />from the pilot study. In effect, data from MW-7 will be used during the pilot study to prevent the <br />groundwater plume from approaching Muni Well 2 from MW-4. <br />It is my understanding from communications with AGE that the field work for the well <br />installations is scheduled for 20/21 May 2008, with the pilot study to follow at the end of May. <br />MW-7 must be developed, sampled, and sample results emailed/faxed to (916) 464-4704) for <br />my final approval before starting the pilot test. <br />If the MW-7 groundwater pre-pilot study sampling results show impacts from petroleum <br />hydrocarbons prior to the pilot study, then the 72-hour pilot test will be delayed while <br />groundwater is pumped from MW-4 into a Baker tank and held for proper disposal. When the <br />MW-7 sample results are non-detect for petroleum hydrocarbons, I have reviewed the non- <br />detect sample results, and given approval to proceed with the 72-hour pilot study, AGE shall <br />submit a revised schedule by email or fax to me for the 72-hour pilot study. <br />Please acquire all permits and rights of access, and provide San Joaquin County and myself three <br />working days notice prior to fieldwork. If you have any questions, please call me at (916) 464-4615 or <br />email me at the following address jbartonAwaterboards.ca .qov. <br />James L. L. Barton. P G <br />Engineering Geologist <br />Enclosures <br />cc: Mr. Ron Rail. San Joaquin County Public Works (Muni Well 2), 1702 E. Scotts Ave., Stockton <br />95205 <br />Mr. Mark Owens, State Water Resources Control Board, Sacramento <br />Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br />Ms. Lauren Cardinalli, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215