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Ms Vicky McCartney Project No 880-040 IA <br /> December 8, 2003 <br />' Page 8 <br />' CONCLUSIONS AND RECOMMENDATIONS <br /> TPHg were reported in groundwater from boring CPT-4 at 25 feet bgs at concentrations <br /> of 370 ug/l MtBE and TAME were reported in bonngs CPT-3 and CPT-4 at 25 feet bgs <br /> at concentrations of 7,600 and 60 ug/l, and 12,000 and 76 ug/l, respectively Benzene <br /> was reported in boring CPT-3 at 45 and 57 feet bgs at concentrations of 2 5 and 13 ug/l, <br /> respectively <br /> Based on the results of this investigation and recent groundwater monitoring and <br /> sampling data, the vertical extent of hydrocarbon impact to groundwater is delineated <br /> but the lateral extent downgradient has not yet been defined `Shaw recommends the <br /> installation of and additional well downgradient as shown on Figure 2 Following well <br /> finstallation, a corrective action plan (CAP) should be prepared recommending remedial <br /> options for the site <br /> If you have any questions regarding this work or require additional information, please <br /> contact Mr Herzog at (916) 565-4377O <br /> 1 ` o . HF <br /> Sincerely, � <br /> �C? y� <br />' SHAW ENVIRONMENTAL,INC 4 C� <br /> � N0.7211 � <br /> 6R Benjamin Chevlen David W Herz g, G OF CV►t <br />' Staff Geologist Project Manager <br /> Attachments Figure 1 — Site Location Map <br />' Figure 2 — Site Map <br /> Figure 3 — Section A — A' <br />' Figure 4 —MtBE Isoconcentration Map <br />' N 1sacDP12003TrjWM0040 1 A 3aa doc <br />