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i <br /> CAMBRIA <br /> i <br /> TPHg and benzene concentrations between the 74 fbg sample and the 83 fbg sample is three <br /> orders of magnitude <br /> RECOMMENDATIONS <br /> It appears that additional delineation of the lateral extent of petroleum hydrocarbons at <br /> depth (50 to 80 fbg) is warranted at this site Cambria recommends drilling additional CPT <br /> borings to delineate the lateral extent of petroleum hydrocarbons in groundwater beneath the <br /> site These borings should be placed 70 to 80 feet from the previous round of borings and <br /> drilled to a depth of approximately 85 fbg Cambria will prepare a work plan proposing this <br /> additional work and submit it to SJCPHSIEHD for review and approval <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 933-2361 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> s <br /> Aubrey K Co <br /> Senior Staff Geologist <br /> _ —� Al ANA <br /> i- W1 <br /> Ne y, RG FRIEI <br /> Senior Project Geologist CD in <br /> RG 6927 b <br /> CC_ a u <br /> �kc X6452 �q <br /> 0� OAL�F� <br /> 0778 7 <br />