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hs.. <br /> 1 <br /> San Joaquin County PHS/EHD <br /> 651 South Tracy Blvd. - PAR <br /> April 10, 1990 <br /> Paige 2 <br /> Results of the Photovac screening are as follows: <br /> Ethyl Total <br /> sample Gasoline Diesel Benzene Toluene Benzene Xylenes <br /> I.D. (mg/L) (mq/x,) (ug/L) _(uq/L) u9/L) (uq/L) <br /> 2 ND 10 ppm ND ND ND ND <br /> 3 1 ppm ND 70 ppb ND ND ND <br /> 5 1 ppm ND ND ND ND ND <br /> 7 ND ND 7 ppb ND ND ND <br /> i 8 ND ND ND 100 ppb ND ND <br /> 19 ND 150 ppm (15 ppm) ND ND ND <br /> All remaining samples were clean or ND for not detected. The <br /> location of these sample points can be seen in PCC's report in <br /> r Attachment 2 pages 13 through 17. <br /> s Six ground water samples were taken to a State certified <br /> laboratory to verify PCC's find:':ngs of ND toward the outer <br /> s. parameter of the tank excavation. All six samples were <br /> analyzed and found to be clean. Refer to Attachment 3 for <br /> tas=_ data ,and sampling locations. Sample 7A had to be <br /> resampled and tested due to carry over contamination on the' <br />` sampling equipment. <br /> 5 <br /> II. Proposed Monitoring Well Installation and Sampling: ;fit <br /> ' +. )�fae�C�7mPaera�#=PrtsAtrses�=t�o'�I�sstra� t47'r'e� x <br /> mQmi-torilrrg^WL-1-l`s-°Ert-the-65.1-South-MacArthur-Blvd--property-in- <br /> N <br /> acArthur-Blvd -property"-i <br /> a y Tray;3-�to�'det��rnr�m�wth�Rgroainct:vrate�gradtgntn:rar►c1::ta.ohta �r <br /> tesamtpler[ fory:c3�emia$3- anat3y s^:° The approximate <br /> locations of these proposed wells are shown on Figure 1. The <br /> depth to ground water is 12.75 feet below grade as was <br /> determined by the initial soil excavation on January 16. <br /> Pi 1990. The total depth.of well will be determined at the time <br /> of drilling based on the depth of encountered ground water at <br /> ti{ each location. A El w€�Lle ;.wi it .Faetd+ aft leeasts£ave x�ee$ <br /> � D�uryce the drilling of <br /> g of the monitoring wells soil types <br /> ` encountered will be logged using the USC system of soil <br /> classification. Soil samples will be collected using a 2-inch <br /> diameter "modified California" drive sampler equipped with <br /> 4 <br /> brass liners. <br /> a4 -£d:ve_$Qet. More frequent sampling will be performed in the <br /> event that any suspected hydrocarbon contamination is <br /> - - - encountered -- Both-driven-samples-and-auger-returns--wall-be---- - - - T-- - - -- <br /> ` s screened in the field for hydrocarbon contamination using a <br /> flame ionization detector type organic vapor analyzer. A <br /> ' E <br /> _ ; J <br />