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0 0 <br /> Scott Mansholt -2- 8 September 2003 <br /> ChevronTexaco <br /> West Byron Road Corridor <br /> groundwater samples should include total petroleum hydrocarbons as gasoline (TPH-g), benzene, <br /> toluene, ethylbenzene, and xylene (BTEX), and methyl tertiary butyl ether (MTBE). <br /> 2. Similarly, we concur with the consultants proposal to advance additional borings north of the Souza <br /> property within the Byron Road easement to collect soil and groundwater samples for analysis. <br /> Similarly, as described above, at least four groundwater samples should be obtained for analysis from <br /> borings without free product. <br /> 3. Off-site soil and groundwater information needs to be provided for the Caldron's Store leaking <br /> underground storage tank (UST) investigation, confirming that leaks have not migrated downgradient <br /> into the Byron Road easement. If the information cannot be obtained, a soil boring(s) should be <br /> advanced north of the store and former UST excavation to collect soil and groundwater samples. Soil <br /> and groundwater samples should be analyzed for petroleum hydrocarbon analysis as described in <br /> item#1 above. <br /> 4. During PG&E's March 2003 investigation within the Byron Road easement, north of the Monterosso <br /> property, concentrations of TPH-g were identified in soil and groundwater. We recommend that an <br /> additional boring(s) be advanced near PG&E boring B-10 and in the vicinity of borings B-14 and 15, to <br /> collect-soil and groundwater samples for analysis as described in item#1 above. <br /> 5. The well survey and search has identified several private domestic water wells along the south side of <br /> Byron Road from the McCormack property to Interstate 205. We recommend that a groundwater <br /> sample be obtained from the wells and submitted for petroleum hydrocarbon analysis as described in <br /> item#1 above. <br /> ChevronTexaco and Regional Board staff, to expedite the characterization process during the course of the <br /> investigation work, will review the results of analysis and field observations to determine the need for <br /> additional borings and sampling. <br /> We concur with the 18 August 2003 West Byron Road Corridor workplan provided our comments outlined <br /> above are addressed. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. Please notify <br /> Regional Board staff at least 48 hours prior to commencing the field investigation and drilling activities. <br /> SHELTON R. GRA C, DEAN HUBBARD <br /> Senior Engineering Geologist Associate Engineering Geologist <br /> RG No. 6357 <br /> cc: Mr. Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> Mr. Garrett Turner, SAIC, Oakland <br /> Mr. Gary Foote, Geomatrix, Oakland <br />