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Ground Zero Analysis, Inc. 1172 Kansas Avenue Modesto,California 95351 (209)522-4119/Fax(209)522-4227 April 1, 2013 Project No.: 770.2 Project Name: Marci Property (Loomis Rd) Mrs. Margaret Marci 20 Mobile Lane Crescent City, CA 95531 RE: Work Plan: Well Destruction Former Marci's Diesel Service (Marci Property), 2969 Loomis Road, Stockton, CA Dear Mrs. Marci: As stated in a March 6, 2013 letter from Ms. Victoria McCartney of San Joaquin County Environmental Health Department (SJCEHD), a No Further Action Required Concurrence letter was received from the Central Valley Regional Water Quality Control Board (RWQCB), dated February 26, 2013. The letter requested that a scope of work proposal for the well destruction activities be prepared and submitted within 90 days of the letter date. Prior to the site receiving regulatory agency closure, all waste materials must be removed and all wells must be destroyed in accordance with San Joaquin County and California State Well Standards. Ground Zero Analysis, Inc. (GZA) has prepared the work plan below for the destruction of eleven (11) monitoring wells, three (3) injection/sparge wells and nine (9) extraction wells (See Figure 2 for well locations). Well Abandonment The wells proposed for destruction are listed in Table 2 along with relevant grout volume calculations based on the method used for destruction. The methods used for well destruction will follow the San Joaquin County Well Standards requirements,including: 1. Wells will be destroyed by drilling out and removing all the contents of the well (conductor casing, well casing, screen, filter pack and grout seal) in the following instances, listed below. Upon removing the well contents, the cleared borehole will be sealed with neat cement by pressure grouting from the bottom upward to a depth of three (3) to five (5) feet below grade. • Laboratory data from the last sampling event demonstrates the presence of any contaminants of concern. i l f i