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B \WO :LAN DOC <br /> • 8I7B SHCURITY <br /> The site is completely fenced in by a seven foot high security <br /> fence, also barricades with lights have been placed arr nd the <br /> excavation in case unathorized persons gain access to tie ox 's <br /> EXCAVATED SOIL <br /> All excavated soil piles are covered with a 6 mil polyethylene <br /> liner to prevent any uncontrolled aeration and possibility of <br /> leaching of contaminants From this soil in the event of exposure <br /> to moisture (rain) A permit to aerate excavated soil pile SP4 <br /> has been applied for, San Joaquin County Air Pollution Control <br /> District "Application For Authorization of Uncontrolled Soil <br /> Aeration" (see Appendix G) Methods for processing the remaining <br /> excavated soil piles are being evaluated (see Table 2 and Figure <br /> 5} <br /> PMJMIBANY SITE/RISK ASS <br /> Petroleum hydrocarbons have been detected at this site in the soil <br /> during the tank removal and the antaal sampling of the tank <br /> excavation and product line trenchs <br /> The following is the general risk appraisal for protection of <br /> water quali�y, using LUFT manual guidelines <br /> SIM AND AREA CHARACTERISTICS <br /> MEAN ANNUAL INCHES OF PRESCIPITATION 11 5", MANTECA <br /> GROUND WATER ELEVATION, FALL 1164 -60 TO -70' AMSL <br /> SURFACE ELEVATION 14' AMSL <br /> SURFACE TO GROUND WATER DEPTH APPROXIMATLEY 75-8-)' <br /> HIGHEST CONCENTRATIONS TPH 4500 PPM @ 15- DEP-i"H <br /> HICHEST CONCENTRATIONS BENZENE 2300 PPM @ 15- DPPT3 <br /> HIGHEST CONCENTRATIONS TOLUENE 2000 PPM @ 15- DEITI <br /> HIGHEST CONCENTRATIONS ETHYL BENZENE 180 PPM @ 15- DEPTH <br /> HIGHEST CONCENTRATIONS XYLENES 3400 PPM @ 15' DEPTH <br /> HIGHEST CONCENTRATIONS OF ETHYLENE <br /> DIBROMIDE (EDB) <3 0 PPM <br /> HIGHEST CONCENTRATIONS OF ORGANO <br /> LEAD (TEL) <5 0 PPM <br /> Using table 2-1 from the LUFT mo-nual a total point score of 48 as <br /> derived for this site, which indicates that the maximum allowable <br /> TPH levels is 100 ppm gasoline range. 1000 ppm diesel range or <br /> less and the maximum allowable B/T/X/E levels are 3/ 3/l/i/ppm <br /> for this site, see Appendix D. site risk assessment <br /> The above "risk assessment" indicates that this site needs to be <br /> assessed an order to determine the vertical and lateral extent of <br /> the petroleum contaminatants <br /> Of special note concerning this site are the following <br /> 3 <br />