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. Soil Remediation Work Plan - Former UST Area <br /> CONTINENTAL GRAIN COMPANY <br /> ' 1805 Harbor Street, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' At the request of Huff&Huff, Inc (H&H),Advanced GeoEnvironmental, Inc (AGE) has prepared <br /> the enclosed Sod Remediation WorkPlan-Former USTArea for the property located at 1805 Harbor <br /> Street, Stockton, California(the site) The location of the site is illustrated on Figure 1 and a plan of <br /> the site is illustrated on Figure 2 <br /> 1 <br /> The scope of work includes soil excavation and shoring of sidewalls, dewatering to lower the water <br /> table(anticipated to be approximately 13 feet above the excavation floor),soil sample collection and <br /> analysis, and disposal of impacted soil and ground water Ancillary operations may also include <br /> concrete pad removal, and removal and replacement of power lines and poles <br /> 1� <br /> This work plan was prepared in accordance with the Central Valley Regional Water Quality Control <br /> Board(CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites, and <br /> ' incorporates recommendations provided by the San Joaquin County Environmental Health <br /> Department(EHD)by letter dated 10 May 2005 A copy of the EHD letter is provided in Appendix A <br /> �• 2.0. BACKGROUND <br /> 1 In the H&H-prepared Corrective Action Plan Addendum (CAP-A), dated 16 March 2005 and <br /> submitted to the EHD, three soil remedial alternatives were proposed <br /> ' • Excavation to 14 to 17 feet into ground water table and laterally to monitoring well MW-4, <br /> removing approximately 850 cubic yards of impacted soil and 506 cubic yards of overburden, <br /> this alternative will require shoring and dewatering <br /> • Excavation to 5 feet below ground water table and laterally to MW-3, removing <br /> approximately 627 cubic yards of impacted soil and 672 cubic yards of overburden, this <br /> alternative will not require shoring, but may require dewatering , <br /> • Excavation to 14 to 17 feet below ground water table and laterally to MW-3, removing <br /> ' approximately 961 cubic yards of impacted soil and 672 cubic yards of overburden, this <br /> alternative will require shoring and dewatering <br /> ' H&H recommended alternative 2 as the most cost-effective solution because shoring will not be <br /> necessary, the hydrocarbon mass removed is comparable to alternatives 1 and 3, and the removal <br /> ' efficiency of alternative 2 will address the free product and petroleum material at the soil/watei <br /> boundary However,in the subsequent 10 May 2005 EHD directive letter,the EHD,with concurrence <br /> 4� of the CVRWQCB, rejected alternative 2 in favor of alternative 1, the concentrations of petroleum <br /> ' Advanced GeoEnvlronmental,Inc <br /> 1 <br />