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WORK PLAN FOR ADDITIONAL SITE ASSESSMENT <br />FORMER SHELL STATION <br />2575 Country Club Boulevard, Stockton, CA <br />Chemical and field measurement data summarized in tables and on figures; and <br />Copies of the boring log, laboratory report, chain-of-custody documents and similar project <br />documentation. <br />3.4.6 SCHEDULING <br />The Site assessment activities described in this workplan will be implemented within 45 days <br />following receipt of approval to proceed from the CRWQCB-CV. An electronic report documenting <br />the findings of the assessment will be submitted to the CRWQCB-CV Underground Storage Tank <br />Program within 60 days of receiving finalized analytical data. <br />3.5 Vapor Intrusion to Indoor Air and Extent of Contaminant Plume - <br />Item #5 <br />The site is an active service station and the station property is therefore exempt for vapor <br />intrusion to indoor air per the State Water Board's LTCP. The groundwater pollution plume does <br />not appear to extend under adjacent properties. Vapor intrusion to indoor air does not appear to be <br />a complete pathway. Please confirm this interpretation in the Work Plan due 10 March 2017. <br />The Site is currently occupied by an active an active Valero service station (Google Maps, March <br />2017), and is exempt for vapor intrusion to indoor air per the State Water Board's LTCP. Based on <br />the most recent groundwater monitoring data (CRA 2014), the groundwater plume does not extend <br />under adjacent properties. Therefore, the pathway for vapor migration is incomplete. <br />3.6 Requirement for Well Construction Table - Item #6 <br />Please include a well construction details table in all ,future documents. This table should include <br />at a minimum: all Site monitoring wells and identified water supply wells, well or boring name, <br />installation date, destruction date (if applicable), elevation, total depth, well diameter, screen <br />interval, and .filter pack interval. Existing and destroyed wells should be included on this table. <br />Inclusion of this infbrmation will aid review. <br />As requested, a well construction details table will be included in all future documents. It is <br />included in this document as Table 2. <br />Page 6