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Geotechnical Inc ca GENERAL WORKPLAN SUBSURFACE SOIL BORING SAMPLING 206 GARFIELD STREET In accordance with your request, we have prepared this workplan for the collection of soil samples from the subject site for laboratory analysis. This letter includes a description of our proposed work elements. The subject property is located within an established commercial and residential area of Stockton, San Joaquin County, California. The approximate 1.9-acre subject property is situated immediately easterly of Garfield Street and southerly of Washington Street. The triangular site is mostly paved and has been used for parking and storage; the far easterly portion of the site supports a radio transmission tower. The San Joaquin County Assessor's parcel number(APN) for the property is 145-210-29. • Research conducted in conjunction with a recent Phase I Environmental Site Assessment performed for the subject property by our firm revealed that groundwater contamination associated with a nearby facility (McCormick and Baxter Creosoting) extends beneath the subject property. It is indicated that groundwater can occur at depths as shallow as about ten feet in the site vicinity. We concluded that, should future redevelopment of the subject property be contemplated, subsurface conditions beneath the site should be further characterized, and a human health risk should be considered. The purpose of this subsurface investigation would be to further evaluate the extent of McCormick and Baxter related contamination beneath the subject property, and to consider, on a preliminary basis, any related health risk. We will direct the advancement of three soil borings (Geoprobe borings) to depths of about 20 feet, or to groundwater, whichever is shallower. Prior to the described Geoprobe sampling activities, we would contact Underground Service Alert (USA) to clear the boring locations of underground utilities. Continuous soil sampling will be performed within each boring. Additionally, grab groundwater samples will be collected if groundwater is encountered in the borings. All drilling and sampling activities would be overseen by a Professional Geologist from our office. Continuous soil sampling would be performed in each of the two borings within the former underground tank area. Following the sampling activities the borings would be backfilled with neat-cement grout and surfaces would be patched accordingly. Selected soil samples and all colleted groundwater samples will be submitted to a State- certified analytical laboratory for analysis of volatile organic compounds (VOCs). 3140 BEACON BLS' WEST SACRAMENTO, CA 95691 -PHONE(916)3- 1434- FAX (916)371-1809