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Project Number 2098RV45 November 30 2017 <br /> As part of the move from the 1744 to 1762 tenant space, previous dry cleaning <br /> machines reportedly were removed and new cleaning equipment was installed. On- <br /> Site dry cleaning occurred until 1995, when all dry cleaning equipment was removed <br /> and the facility continued as a drop-off business only with dry cleaning performed at <br /> an off-Site facility <br /> 1.2 Investigation Purpose <br /> The purpose of the proposed investigation activities is to assess whether PCE was <br /> released to the subsurface from historical dry cleaning operations. Soil and soil gas <br /> sampling were described in the Work Plan dated November 15, 2017. Based on the <br /> results of the soil and soil vapor investigation, a groundwater investigation may be <br /> necessary. If the soil and soil vapor investigation results indicate that groundwater <br /> investigation is necessary, then the following groundwater investigation workplan is <br /> proposed for implementation after the review and approval from the Water Board. <br /> A phased approach to subsurface investigation is recommended based on concerns <br /> for potential cross-contaminating (down slough or between sample depths) of soils <br /> and/or shallow groundwater that may be impacted with PCE. It is essential to assess <br /> the presence, if any, of PCE in shallow soil before proceeding with deeper sampling <br /> activities due to likely lateral and vertical variability of the lithology (i.e. interbedded <br /> and/or alternating fine and coarse-grained layers from the ground surface to <br /> saturated sediments at approximately 30 to 40 feet below ground surface [bgs]) <br /> observed in the vicinity of the Site and anticipated to be present at the Site. <br /> 2.0 SITE INVESTIGATION WORKPLAN ADDENDUM <br /> The soil and soil vapor investigation scopes of work were included in the investigation <br /> workplan dated November 15, 2017. This addendum includes: <br /> 1 Permitting Soil Boring/Monitoring Wells; <br /> 2 Installation of Groundwater Monitoring Wells; <br /> 3 Groundwater Sampling and Analysis; <br /> 4 Reporting; <br /> 5 Proposed Schedule of Investigation Activities; and, <br /> 6 Soil gas investigation procedures. <br /> 2.1 Soil Boring/Monitoring Well Permitting <br /> EzC proposes to advance four (4) soil borings to be completed as monitoring wells (see <br /> Figure 2 for locations). All four (4) monitoring well locations are on Client-owned <br /> property and no access agreements or encroachment permits will be required. <br /> Soil boring and monitoring well permits will be required by the San Joaquin County <br /> Environmental Health Department (SJCEHD). Permits for all 13 soil borings will be <br /> required and if warranted, permits for 4 groundwater monitoring wells will be <br /> obtained. EzC will adhere to any and all provisions contained in the SJCEHD permits. <br /> E2C Remediation 4 <br />