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Project No 034-98081 <br /> Page No 7 <br /> 7 Based on the previous three conclusions, a possible off-site source for PHC groundwater <br /> contamination exists Krazan understands a large capacity sewer main trends parallel <br /> with Industrial Drive along its northern boundary, approximately 120 feet north of MW- <br /> l This sewer main services many large industrial clients existing north and east of the <br /> subject site who's effluent flows westward, past the subject site The competence of this <br /> sewer line is unknown, as are the chemical constituents which it might transport <br /> 70 RECOMMENDATIONS <br /> Krazan recommends that further groundwater sampling is necessary to define the lateral limits of the <br /> PHC plume or to prove its off site source Sampling locations should be placed to the north and west of <br /> monitoring well MW-1 as close to the subject site property boundary as feasible PHC concentration <br /> trends increasing toward the property boundary would imply an off-site source for the contaminants <br /> j noted in groundwater <br /> so LIMITATIONS <br /> The findings of this report were based upon die results of field and laboratory investigations, coupled <br /> with the interpolation of subsurface conditions associated with our soil borings and monitoring wells <br /> Therefore, the data are accurate only to the degree implied by review of the data obtained and by <br /> professional interpretation <br /> The exploratory soil borings and monitoring well locations were Iocated in the field by review of <br /> available maps and by tape measurement from existing landmarks in conjunction with a topographic <br /> survey conducted by Frame Surveying and Mapping of Davis, California Therefore, the soil borings and <br /> monitoring well locations should be considered accurate only to the degree implied by the methods used <br /> to locate them The conclusions presented in this report are based upon existing site conditions at the <br /> time of our field investigation Evaluation of the conditions at the site for the purpose of sampling and <br /> testing were made from a limited number of observation and sampling points Subsurface conditions <br /> KRAZAN & ASSOCIATES, INC <br /> Offices Serving the Western United States <br /> 3498081 sgz <br />