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� � � +fix:�• t4.:b� w � _ 6 � 4 +- ii 6 kr' <br /> CHAPTER 4 <br /> CCNCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of Brown and Caldwell's (BC) investigation <br /> r of the ARCO Petroleum Products Company (ARCO) Station 6080 site, the <br /> following conclusions and recommendations have been made. <br /> Conclusions <br /> Only minor concentrations of total petroleum hydrocarbons (TPH) <br /> were found in two soil samples. Concentrations of 29 and 10 milli- <br /> grams per kilogram (mg/kg) were found in AL1-1 and AL5-2, <br /> a` respectively. All other soil and groundwater samples were below <br /> detection limits for the various analyzed constituents. Total lead <br /> f concentrations were below 0.02 microgram per liter. No statewide <br /> 3. standards for TPH have been set, although the California Regional <br /> Water Quality Control Board, San :Francisco Bay Region, calls for <br /> ' soil, excavation if greater than 1,000 mg/kg. <br /> A <br /> I Recommendations <br /> Since hydrocarbon levels have not been identified which exceed <br /> designated or action levels, BC -recommends_ np., new-we,ll.s or.._boreholes <br /> be ` installeal Quarterly. mon itor xng of existing groundwater pwells <br /> 1 far a-.::perioi3 'of `I yea prior" to- their destruction is recommended. <br /> ay <br /> Monitoring should consist oi_ water• ."level. measurements:, and.., <br /> groundwater"sampling Analyses should be for benzene, toluene, and <br /> x l;ylene. ftertYie .l: year; if no hydrocarbon constituents are found, <br /> „ the'weils should be properly destroyed: <br /> �b <br /> 41 <br /> I <br /> ]y <br /> S ` <br />