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i a <br /> iCalifornia R V oval Water Quality Control Board r°• <br /> Central Valley Region � <br /> Peter M.Rooney <br /> Sacramento Main Office Ed J.Schnabel <br /> `�.' <br /> Secretary for Internet Address: http://www.swrcb.ca.gov/--rwgcb5/li'ome.html Chair <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California.99$27-3003 <br /> Protection Phone(916)255-3000•FAx(916)255-3015_ <br /> 4 � <br /> 22 December 1998 ,, CERTIFIED MAIL <br /> Z 100 456 093 <br /> Mr. Ronald Nunan 1 <br /> 651 Gateway Boulevard#790 <br /> South San Francisco, CA 9480$ <br /> PRELIMINARY INVESTIGATION AND EVALUATION REPORT AND GROUNDWATER , <br /> MONITORING/SAMPLING REPORT REQUIRED,FORMER TOWN & COUNTRY <br /> CHEVRON, 13336 E. HWY. 88, LOCKEFORD, SAN JOAQUIN COUNTY � to <br /> ;� # .t <br /> On 13 February 1998 we requested'that you determine the lateral and vertical extent of contamination, <br /> calculate the remaining contaminant mass in soil, and collect one groundwater sample to evaluate impact <br /> to water quality. You agreed to perform this investigation and between 26 June and 1 July 1998, your <br /> consultant drilled one soil boring to groundwater (see enclosed memo). Based on contaminant <br /> concentrations identified in soil and groundwater, water quality beneath the site has been impacted. The <br /> extent of the water quality problem must be defined. <br /> r Board staff completed a case file review and determined that the following actions are required: <br /> • Initiate a groundwater investigation, including: drilling three soil borings to groundwater; collecting <br /> discrete soil samples from the capillary fringe and saturated zone; and installing monitoring wells to <br /> determine the hydraulic gradient, groundwater flow direction, and groundwater quality: Soil and <br /> groundwater analyses must include TPHg,BTEX, 1,2-DCA and the fuel oxygenates (TBA, MTBE, <br /> DIPE,ETBE, and TAME). <br /> • Sample and analyze the two nearby Lockeford supply wells for'constituents of concern. <br /> "' • Initiate a quarterly groundwater monitoring"and sampling program: <br /> You may incorporate the new soil and groundwater data into fate and transport modeling to evaluate <br /> contaminant migration through the subsurface. <br /> In accordance with Section 13267 of the California Water Code,which states in part: ...the regional <br /> board may require that any person who has discharged, discharges, or is suspected of discharging, or <br /> who proposes to discharge waste within its region, or any citizen'or domiciliary, or political agency or <br /> entity of this state who has discharged, discharges, or is suspected!`of discharging, or who proposes to <br /> discharge, waste outside of its region that could affect the qualityof waters within its region shall <br /> furnish, under penalty of perjury, technical or monitoring program reports which the regional board <br /> requires. The burden, including costs, of these reports shall bear'a reasonable relationship to the need <br /> for the report and the benefits to b`e obtained from the reports... the results of these activities must be. " <br /> J <br /> California Environmental Protection Agency x <br /> ��Recycled Paper <br />