WORK PLANS - Laserfiche WebLink

Home Browse Search

Sampling and Analysis Plan for Phase II Environmental Site Assessment 125 North Stockton Street, Lodi,CA 95240 3.0 SCOPE OF WORK This section describes the planned scope of work and methods for the proposed Phase II ESA of the Property. The Phase II ESA will further evaluate potential on-site sources of impact to soil and soil vapor. It is anticipated that data from this investigation will be used to: a) determine remedial and/or mitigation requirements associated with future redevelopment of the Site; b) prepare an Analysis of Brownfield Cleanup Alternatives (ABCA) document, as appropriate; and c) provide data to inform appropriate soil handling measures during redevelopment.The Phase II ESA process details are provided in Table 1 and summarized in this section. 3.1 Preliminary Activities Prior to intrusive work Stantec will complete the following preliminary activities: • Prepare a site-specific HASP as required by Title 29 of the U.S. Code of Federal Regulations, part 1910.120, and in accordance with Stantec protocols. • Obtain a drilling permit if required by the San Joaquin County Environmental Health Department. • Mark proposed exterior investigation locations in white paint, open a one-call ticket with Underground Service Alert, and retain a private utility locator to confirm that proposed drilling and excavation locations are free of detectable subsurface utilities or other obstructions. As part of the survey, the locator will use ground penetrating radar to evaluate the vicinity of the former UST in the northwestern portion of the Property such that if a suspected UST or infilled cavity is identified, the soil borings targeting this feature can be appropriately located to investigate this feature. • Coordinate with City of Lodi staff for site access. 3.2 Soil and Soil Gas Sampling Activities Stantec will subcontract with a California-licensed driller to facilitate the collection of soil and soil vapor samples as described in the following sections. Soil samples will be collected from multiple depth intervals at ten locations across the Property, and soil vapor samples will be collected from two depths at four locations. Proposed sampling locations are illustrated on Figure 3. Soil vapor sampling will be conducted in accordance with the Advisory for Active Soil Gas Investigations published by the California DTSC (July 2015). The project sampling program, including sampling rationale for each borehole, is summarized in Table 2. Proposed Phase II ESA soil and soil gas sampling activities are described in the following sections. J.Z. I sou sampling Temporary borings will be advanced to 5 feet bgs using a hand auger, and then advanced to terminal depth using direct-push equipment. Subsurface materials will be logged and described for lithologic characteristics using the Unified Soil Classification System and screened for visual/olfactory characteristics and for the presence of VOCs using a photoionization detector (PID) equipped with a 10.6 electron-volt lamp. Soil classification, visual/olfactory observations of soil conditions, and PID results will be documented in the project notebook or on field data sheets. Stantec 10