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PERFORMANCE WORK STATEMENT(PWS) Version 3(3/10/2014) Installation of E-zone Groundwater Monitoring Wells McCormick and Baxter Superfund Site Stockton,California Part 1 General Information L GENERAL: This is a non-personnel services contract to provide drilling,sampling,and well installation services at the McCormick and Baxter Superfund Site in Stockton,California.The Government shall not exercise any direct supervision or control over the contract service providers performing the services herein if the service provider is a subcontractor to the prime. Such contract service providers shall be accountable solely to the Contractor who,in turn is responsible to the Government. 1.1 Description of Services/Introduction: The Contractor shall provide all personnel,equipment,supplies,facilities,transportation,tools,materials, supervision,and other items and non-personal services necessary to perform drilling,sampling,and well installation services as defined in this Performance Work Statement except for those items specified as Government furnished property and services. The Contractor shall perform to the standards in this contract. 1.2 Background: The McCormick and Baxter Superfund Site occupies approximately 32 acres in a predominantly industrial area near the Port of Stockton and the junction of Interstate 5 and State Highway 4 in Stockton,California. When in operation from 1942 to 1991,The McCormick and Baxter Creosoting Company used various wood preservation processes and products to make treated wood products for utilities,railroads,and the construction industry. Preservatives included creosote,pentachlorophenol,arsenic,copper,chromium,and zinc. The company subsequently filed for bankruptcy and is no longer in business. The United States Environmental Protection Agency(EPA)currently is the lead agency for cleanup activities at the site. Groundwater contamination resulting from site practices has been characterized and is known to have spread beyond the property boundary. Naphthalene,a component of creosote, has been detected in groundwater north of the site and as deep as 265 feet in what is referred to as the E-zone aquifer. Additional distal or hydraulically downgradient monitoring points are needed within the E-zone to define the distal extent of the naphthalene dissolved phase plume. This is because no ideally located downgradient wells in the E-zone currently exist. This PWS concerns the installation of 4 E-zone wells located on flat ground north of the McCormick and Baxter property. 1.3 Objectives: • Drill two nominal 8-inch diameter borings,each approximately 300 feet in depth through interlayered sand and silt/clay formation. • Collect groundwater grab samples through the temporary drill casing during drilling within the D-and E- aquifer zones. From the initial two borings,three groundwater grab samples are to be collected from each boring. • Install monitoring wells in the first two borings. Monitoring wells to be completed with 4-inch diameter Schedule 80 PVC,0.010-inch slotted screens,and backfilled with#20-40 filter sand,bentonite,and cement-bentonite grout. • Depending on analytical results of groundwater grab samples(to be analyzed under separate contract)from the first two borings,step inward or outward and drill two optional additional borings each approximately 300 feet deep.