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Mr. Brian Hitz <br />August 24, 2021 <br />SAIC Work Plan dated May 2013 <br />In their Work Plan, SAIC stated the purpose of the investigation was to confirm the extent of a potential <br />near -surface petroleum hydrocarbon seep previously observed at the site. The seep was identified near a <br />fenced area, northwest of the former pump house building. SAIC proposed to advance up to 10 soil <br />borings within the "General Area of Investigation" measuring approximately 375 feet by 190 feet shown <br />on Figure 2. The soil borings would be advanced to a maximum depth of 5 feet below ground surface <br />(bgs). The Work Plan stated "soil samples will be visually evaluated for the presence of residual <br />hydrocarbons and soil samples will not be collected for chemical analysis". <br />Prnnncari Work Plan Ampnriments <br />As noted above, CEMC and Arcadis met with the property owner onsite and conducted a site visit on July <br />6, 2021. The purpose of the site visit was to assess the current site conditions and identify proposed soil <br />boring locations. No near -surface petroleum hydrocarbon seeps were identified during the site visit. <br />Based on the available site information and the site visit, Arcadis is proposing to advance and sample six <br />(6) soil borings at the locations shown on Figure 2. Consistent with the Work Plan, the proposed soil <br />borings will be advanced within SAIC's "General Area of Investigation" near the previously identified <br />potential near -surface petroleum hydrocarbon seep. The borings will be advanced to a maximum depth of <br />5 feet. The advancement and sampling of additional soil borings may be warranted based on field <br />observations (hydrocarbon staining and/or odors). Given CEMC's ultimate goal to secure a No Further <br />Action Required status for this site, Arcadis is proposing to amend the Work Plan and collect soil samples <br />at the approximate depths of 2 and 5 feet bgs for chemical analysis. Each soil sampie will be properly <br />labeled and preserved, recorded on a chain of custody, and relinquished to a state -certified laboratory. <br />The soil samples will be analyzed for total petroleum hydrocarbons quantified as crude oil (TPHc; C10 to <br />C36) by United States Environmental Protection Agency (USEPA) Method 80156; benzene, toluene, <br />ethylbenzene, and xylenes (BTEX) by USEPA Method 826013; and polycyclic aromatic hydrocarbons <br />(PAHs) by USEPA Method 8270C SIM. <br />As requested in the Central Valley Water Board letter dated August 5, 2021, if Arcadis is not able to meet <br />the proposed due dates, a letter will be submitted proposing a new time schedule for implementing the <br />Work Plan and submitting the investigation report. <br />Please contact me at christine.perezCa)arcadis.com or (805) 459-2391 with any questions concerning the <br />proposed amendments to the Work Plan. Arcadis will begin pre -field coordination activities after receiving <br />approval from the Central Valley Water Board for the proposed Work Plan amendments. <br />Sincerely, <br />Arcadis U.S., Inc. <br />Christine Perez <br />Project Manager <br />arcadis com Page: <br />Former Tracy Pump Station Work Plan Amendment D8.24.2021 2/3 <br />