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Mar-07-95 10 = 49 Grouind Zero Inc-JMP 415 381 -5416 P _ O3 <br /> Ground Zero will drill three offsite soil borings/monitoring wells <br /> (SB-33/MW-9, SB-34/MW-10 , and SB-35/MW-11) previously proposed in <br /> our letter to you (dated January 4, 1995) at locations shown on the <br /> attached site plan. <br /> Ground Zero does not propose drilling a soil boring/monitoring well <br /> in the adjacent warehouse at this time since we have been denied <br /> access to the warehouse by the owner's attorney (letter dated <br /> February 24 , 1995) . In our discussion you indicated that an <br /> additional soil boring/monitoring well east of the warehouse <br /> located on the adjacent property would be acceptable. Therefore in <br /> addition to the previously proposed monitoring wells, Ground Zero <br /> proposes to drill a soil boring/monitoring well (SB-36/MW-12) east <br /> of the warehouse. The well will be constructed of 2-inch diameter <br /> PVC and will be screened from approximately 53 to 73 feet bgs. <br /> Soil samples will be collected at five foot intervals for physical <br /> analyses and logging purposes only. The purpose of the physical <br /> analyses is to evaluate the physical and hydrogeologic parameters <br /> of the vadose and groundwater bearing zones. Groundwater samples <br /> collected from the well will be analyzed for TPHg and BTEX using <br /> EPA Methods 8015 and 8020, respectively. Ground Zero understands <br /> that San Joaquin County Public Health Services-Environmental Health <br /> Division (SJCPHS-EHD) will consider groundwater up to that well as <br /> being impacted by petroleum hydrocarbons if hydrocarbons are not <br /> detected in groundwater samples from the well . <br /> Due to the presence of a confirmed leaking UST site (Endich <br /> Brothers) located immediately upgradient of the subject site, <br /> Ground Zero is concerned about performing a pump test onsite and <br /> drawing groundwater impacted by petroleum hydrocarbons toward the <br /> site from the Endich Brothers site. Therefore, Ground Zero <br /> proposes to evaluate hydrogeologic parameters by laboratory <br /> determination of permeability instead of a pumping test. These <br /> data will be used in order to evaluate groundwater remediation <br /> alternatives. Furthermore, Ground Zero proposes to analyze soil <br /> samples collected from the vadose zone for vapor extraction <br /> feasibility study and review vapor extraction feasibility data <br /> obtained from existing case files with similar lithologies where <br /> data from tests performed at the other sites were representative of <br /> site conditions. <br /> Ground Zero will prepare and submit a soil disposal plan for soil <br /> generated during previous work at the site. Ground Zero proposes <br /> onsite disposal of cuttings generated during the proposed phase of <br /> field work if laboratory results indicate non-detectable levels of <br /> petroleum hydrocarbons. Soil generated during the proposed phase <br /> of field work with detectable concentrations of petroleum <br /> hydrocarbons will be included in the soil disposal plan to be <br /> prepared by June 2, 1995. <br /> Ground Zero will submit a copy of our workplan and addendum along <br /> with corresponding costs to Mr. George Lockwood of the UST fund for <br /> pre-approval by March 10 , 1995 in order to expedite reimbursement <br /> of expenses related to the proposed work. <br />