Laserfiche WebLink
PROPOSAL FOR REMEDIATION SERVICES <br /> ..■ MOBIL SERVICE STATION #10-NP4 <br /> TRACY, CALIFORNIA <br /> 1 <br /> located east and northeast of the site, range from 0. 3 <br /> ppm to 3 ppm. Benzene concentrations in these wells <br /> range from 0. 003 ppm to 0. 14 ppm. <br /> Regulatory Considerations <br /> o Benzene concentrations reported in October 1988 exceed <br /> the California Department of Health Services (DHS) <br /> Drinking Water Action Level of 0.0007 ppm in three of the <br /> wells on--site and in two of the wells off-site. Toluene <br /> and xylenes concentrations reported in well MW-3 in <br /> October 1988 also exceed Drinking Water Action Levels. <br /> Groundwater cleanup is typically required with site <br /> contamination concentrations exceeding these action <br /> levels; j <br /> o Cleanup levels should be negotiated with the San Joaquin <br /> County Local Health District (LHD) following preliminary <br /> data gathering activities at the site. The LHD may <br /> submit material to the RWQCB for review and approval <br /> prior to agreeing to the proposed cleanup levels; <br /> o LHD requires submittal of a remediation proposal prior to 1 <br /> issuing well and exploratory boring permits necessary to <br /> initiate field investigations at the site; and <br /> o LHD requires submittal of a Remediation Work Plan prior <br /> to installation and. start-up of a site remediation <br /> system. LHD may submit this plan to RWQCB for review and <br /> approval prior to issuing permits necessary to start <br /> cleanup at the site. <br /> Other permitting and regulatory issues are discussed in detail <br /> below. <br /> SCOPE OF SERVICES <br /> i <br /> This project will be composed of several tasks which are <br /> described below. The schedule and costs for accomplishing the <br /> work are presented in subsequent sections of this proposal. <br /> Task 1 - Additional Information and Pre aration of Site <br /> Remediation Work Plan <br /> In order to finalize the design of the treatment system and <br /> prepare a site remediation work plan, the following site <br /> characterization information will need to be assessed. <br /> I <br /> -3- <br />