Laserfiche WebLink
Geosyntec ® 1111 Broadway, Floor <br /> Oakland,Californias 94607 <br /> PH 510.836.3034 <br /> consultants FAX 510.836.3036 <br /> www.geosyntee.com <br /> Memorandum <br /> Date: November 9, 2018 <br /> To: John Murphy, Central Valley Regional Water Quality Control Board <br /> From: Anju Wicke, Senior Principal <br /> Kimberly Brandt,P.G., C.Hg. (CA), Senior Geologist <br /> Subject: DRAFT Addendum to Draft UST Data Gap Investigation Work Plan, Rough <br /> and Ready Island, Port of Stockton, San Joaquin County, California <br /> Geosyntec Project Number: WR2501 <br /> This memorandum has been prepared as a Draft Addendum to the Draft Underground Storage <br /> Tank(UST) Data Gap Investigation Work Plan(Draft Work Plan) for Rough and Ready Island <br /> (RRI), Port of Stockton, San Joaquin County, California dated July 30, 2018 prepared by <br /> Geosyntec Consultants, Inc. (Geosyntec) on behalf of the Port of Stockton(the Port). This <br /> memorandum also serves as a response to the Central Valley Regional Water Quality Control <br /> Board's (CVRWQCB) comments to the Draft Work Plan dated September 20, 2018. <br /> The Draft Work Plan describes procedures for the collection and analysis of additional <br /> subsurface soil data to address data gaps at four former UST sites: (1)UST Site 517; (2) UST <br /> Site 605; (3)UST Site 81713; and(4) UST Site 916B. These four former UST sites are <br /> potentially eligible for closure under the Low Threat Underground Storage Tank Case Closure <br /> Policy (LTCP). However, several data gaps remain,prohibiting a full evaluation for no further <br /> action at these sites. The objective of the Draft Work Plan and this addendum is to describe the <br /> procedures for the collection and analysis of additional subsurface soil and groundwater data to <br /> address these data gaps. <br /> The CVRWQCB's September 20, 2018 letter provided comments to the Draft Work Plan for two <br /> of the UST sites, UST Site 817B and UST Site 916B. The CVRWQCB's comments and <br /> Geosyntec's responses to each comment are presented below. <br /> CVRWQCB COMMENT 1: UST SITE 817B <br /> Issues: The Port proposes to collect soil samples at UST Site 817B from two soil borings <br /> adjacent to the previous highest areas of benzene detections (samples 817-D5 and 817-D7)that <br /> exceeded LTCP media-specific criteria in 2008. Soil samples from these two borings will be <br /> analyzed for benzene and total petroleum hydrocarbons (TPH) in the gasoline (TPH-g) and <br /> diesel (TPH-d) range and evaluated against LTCP media-specific criteria for petroleum vapor <br /> intrusion to indoor air and direct contact and outdoor air exposure. However, a review of <br /> engineers I scientists I innovators <br />