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SITE INVESTIGATION WORK PLAN SECOND REVISION Former Helena Chemical Facility 2245 West Charter Way Stockton,California December 22,2015 1.0 INTRODUCTION This work plan was prepared and revised by Condor Earth Technologies, Inc. (Condor) to describe the proposed Site investigation activities at the former location of Helena Chemical at 2245 West Charter Way, (Site) in Stockton, California (Figures 1 and 2, Appendix A). The Site is identified as Assessor's Parcel Number 163-36-017 and comprises 6.47 acres,according to county records. The Site is bordered to the west by Tillie Lewis Drive and to the south by Charter Way State Highway 4. The purpose of the work is to fill data gaps and improve the accuracy of interpretation for the lateral and vertical extents of fertilizer contamination related to aboveground storage tanks (ASTs) formerly located at the Site. The proposed work will include drilling and sampling soil and groundwater at 14 locations for laboratory analysis, then installing three groundwater monitoring wells, and collecting groundwater samples for laboratory analyses. The Site is located in the Central Valley region of California near the San Joaquin River and Delta,approximately 75 miles east of San Francisco. 1.1 RESPONSIBLE PARTY AND AGENCY Condor prepared this work plan at the request of Ms.Beverly Garcia of Raymond Investment Corporation (property owner) and as directed by Ms. Pamela Creedon of the Central Valley Regional Water Quality Control Board (CVRWQCB) in the letter dated April 1,2014.The work plan,dated June 17, 2014 was sent to the CVRWQCB for review.The work plan was reviewed and Aimee Phiri of the CVRWQCB requested additional information on August 21, 2014.The additional information was provided in a letter October 29, 2014. CVRWQCB representatives visited the Site on January 30, 2015. The CVRWQCB requested a revised work plan in the letter dated February 6, 2015. After submission of the Revised Work Plan, the CVRWQCB issued further comments and requested a second revision to the work plan in a letter dated September 10, 2015. In order to facilitate final approval, Condor and CVRWQCB agreed on the revisions herein during a conference call on December 3,2015. This work plan was revised based on United States Environmental Protection Agency Region 9 (EPA) Sampling and Analysis Plan Guidance and Template, Version 4 General Projects, R9 QA1009.1, May 2014. All work conducted by Condor will be under the supervision of a California Certified Engineering Geologist. This work plan includes project background information,a description of the field, laboratory, and reporting procedures proposed to conduct the work,and a project schedule. Table 1—Key Project Personnel Contact Information and Responsibilities Name Phone Number E-mail Address Responsibilities Bill A.Cook III,C.E.G (209)938-1004 bcook a condorearth.com Project Manager Alex B. Dewitt,P.G. (209)938-1041 adewitt(acondorearth.com Quality Assurance Manager w 1� CONDO