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James L. Tjosvold, P.E. <br /> August 19, 1996 <br /> Page 23 <br /> The highest TPH-gasoline concentration detected was 16 mg/kg at 19.5 feet in SB- <br /> 11-95. The highest total BTEX measurement was 0.33 mg/kg in SB-12-95 at 23.5 feet <br /> bgs. The highest measurement of TPH-diesel was in MW-7 at 4.0 feet bgs: 50.5 <br /> mg/kg was an estimated value at the detection limit. <br /> Comment: <br /> 14. Page-5-1, Section 5.1, Remedial Action Objectives <br /> The FS states that one of the objectives of the remedial action is to reduce the potential for <br /> migration of the constituents of potential concern (COPC) to ground water beneath the <br /> PG&E property. For clarification, the objective should state that the purpose of the remedial <br /> action is to reduce contaminant concentrations to levels which will not result in exceedance <br /> of water quality goals in groundwater. <br /> Response: <br /> 14. As the soil and groundwater FSs are being recombined, there is a restated <br /> remedial action objective as stated in PG&E's letter dated June 6, 1996. The <br /> objective of the remedial action is to protect public health and the environment from <br /> the COPCs present in on-site soil and groundwater and minimize the potential <br /> migration of COPCs to groundwater. The remedial action goals that will be <br /> evaluated to satisfy this objective address soil concentrations related to groundwater <br /> goals. As discussed in our meeting with DTSC and RWQCB on May 22, 1996, a <br /> range of potential groundwater limits will be evaluated in the combined soil and <br /> groundwater FS. <br /> Comment: <br /> 15. Page 5-1, Section 5.2.1, Federal and State Regulations and Guidelines for Soil <br /> The State Water Resources Control Board Resolution No. 92-49 should be included in this <br /> section. A copy of Resolution No. 92-49 (Attachment 2) is enclosed for your reference. <br /> Response: <br /> 15. The State Water Resources Control Board Resolution No.92-49 was not included <br /> in the regulations and guidelines section for soil because it pertains directly to water <br /> quality criteria and not soil cleanup. However, Resolution No. 92-49 and its <br /> proposed revisions will be included among the federal and state regulations and <br /> guidelines for groundwater in the combined FS. <br /> Comment: <br /> 16. Page 5-2, Section 5.2.2, Remedial Action Goals for Soils <br /> The FS states that specific federal or state standards are not available for COPC in soil for the <br /> protection of human health and the environment. The beneficial-use protective numerical <br /> limits in ground water to protect municipal and domestic supply are presented in <br />