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STATE Qui CALIFORNIA S GEORGE DEUKMEJIAN,Governor <br /> �� '— <br /> C/'�:LlFORNiA REGIONAL WATER U.UALITY CONTROL. BOARD--= <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 35827-3098 <br /> MAR . 831989 <br /> 7 March 1989 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT 1 SERVICES <br /> Mr. Jerry Moore <br /> Frank's Exxon #4 <br /> 14800 South Highway 99 <br /> Manteca, CA 95336 <br /> PRELIMINARY REPORT WORK PLAN FOR-FRANK'S EXXON #4 AT .14800 SOUTH HIGHWAY 99, <br /> MANTECA, SAN JOAQUIN COUNTY <br /> ThankYOU for submitt. 1988 work .plap- for a Preliminary <br /> Report (PR) for our review. <br /> The analytical results for soil and ground water samples collected from <br /> monitoring wells MW-1 and MW-2 suggest that this site may require minimal <br /> remedial action. In pursuit of site closure we recommend the follo�ving <br /> modifications to the proposed work plan: <br /> 1. Install a fourth monitoring well east of .the tank field at the <br /> approximate location shown in figure 1 (enclosed) . This should enable <br /> an accurate calculation of the groundwater gradient and flowdirection, <br /> and give an indication of background hydrocarbon concentrations .i.n soil--. . . <br /> and ground water at your site; and <br /> 2. From each borehole, soil samples are to be collected every five feet or <br /> change in lithology, and we recommend .,that all soil samples collected <br /> from 15 feet below the surface down to the extent of the borehole-be' - _.-- <br /> - submitted for laboratory analysis. ' The upper two samples (collected at <br /> five and ten feet below the surface) are to be preserved in case <br /> laboratory analysis is requested. Your consultant proposes screening <br /> soil samples in the field using a photoionization detector tosel'ect <br /> soil samples for laboratory analysis. This is generally acceptable, but <br /> in pursuit of site closure a detailed characterization of the soil <br /> -- -beneath -your si*..e'.-i-s-.ia.rr--nted�, ► -,�.•--. �P <br /> Please address these two issues in an addendum to this.work <br /> _plan and submit <br /> to us and the San Joaquin Local' Health District (SJLHD) 6y 17 MarchI1989. , <br /> We have the following comments regarding the contents of the Preliminary <br /> Report: <br /> 1. The Preliminary Report is to be completed following the format outlined <br /> in Appendix A of the Tri-Regional Guidelines (enclosed) ; <br /> 2. Include pertinent information on the old tanks (pre-October 1983)°, such <br /> as number, size, - products stored, and ,tank locations. Were t! e-old <br /> pipelines replaced when the neW tahks. were installed? <br />