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Soils Engineering i n e . <br /> January 23 , 2020 SEI File No. 2047515 <br /> Brinderson Constructors <br /> 3070 Bay Vista Court <br /> Benicia, CA 94510 <br /> Attention: Mr. Aaron Swol <br /> Subject: UST Assessment Workplan <br /> Project: Shell Oil Distribution Plant <br /> Location: 3515 Navy Drive, Stockton, CA 95201 <br /> Dear Mr. Swol: <br /> Soils Engineering, Inc. (SEI) has prepared this underground storage tank (UST) Assessment Workplan <br /> (Workplan) for one (1) 6,000-gallon petroleum contact water UST at the Shell Oil Facility located at 3515 <br /> Navy Drive in Stockton, CA. (site). See Plate 1 for Location Map. One (1) 6,000-gallon UST is proposed to <br /> be abandoned in-place and an assessment of the subsurface conditions beneath the UST is required by the <br /> San Joaquin County Environmental Health Department (SJCEHD) as part of this abandonment. The <br /> location of the UST is shown on the attached Plot Plan (Plate 2). <br /> PROPOSED ASSESSMENT OF UST <br /> Field Work Proposed <br /> • SEI will contact Underground Service Alert North (USAN) a minimum of 72 hrs before conducting <br /> the field activities in order to get underground utilities identified in the site area. A utility survey of <br /> the project area will also be completed to verify any potential subsurface utilites in the work zone. <br /> • SEI will acquire the required boring permit to conduct the environmental assessment of the 6,000- <br /> gallon UST from the SJCEHD. <br /> • SEI will advance two (2) 25-degree angled borings (B 1 and B2) with a CME-75 hollow-stem drill <br /> rig along side and under the UST to assess possible hydrocarbon impacted soil around and under this <br /> UST prior to abandonment in-place (see Plate 3 for proposed boring locations). Soil samples will be <br /> collected at approximate depths of 2' and 4' below the base of the 6,000 gallon UST which is an <br /> estimated vertical depth of 14' and 16' from the surface (see Plate 4 for a profile of the angle soil <br /> borings and the UST). The soil samples will be collected with a California modified split-spoon <br /> sampler driven 18" and containing clean stainless steel sleeves. The soil samples will be sealed, <br /> 02020 SOILS ENGINEERING, INC. <br /> 4400 YEAGER WAY Phone: 661 831 5100 Infogbollsengineering.com <br /> BAKERSFIELD, CA 933134019 Fax: 661 831 2111 www.sollsenginearing.com <br />