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KLEINFELDER benzene, toluene, ethylbenzene, and xylenes respectively (taken at depths of 15, 20 and 25 feet). B2 and B3 soil samples were analyzed for TRPH, and reported none detect. A grab groundwater sample was taken from B-1 with reported concentrations of 2,560 PX , 1,300 ppb, 30,000 ppb, 37,000 ppb, and 194-.9 ppb Lfor TPH-G, benzene, toluene, ethylbenzene, and xylenes respectively. n1 912#/691 On October 17, 2003 the EHD issued a letter of"official notification" that the above site has been assigned to the Local Oversight Program "for oversight of assessment and clean up activities at contaminated underground storage tanks sites." EHD requested a workplan to investigate the lateral and vertical extent of contamination at the above site. SCOPE OF WORK TASK 1.0 PERMITTING AND PRE-FIELD ACTIVITIES It has been Kleinfelder's experience that this document contains sufficient detail and information to be submitted to San Joaquin County Environmental Health Department (Elm) to review and �b approve a boring/well permit and setting up the Master File Record or a site. n a °l Kleinfelder will submit a well permit application along with this workplan to EHD. The San UYn Joaquin County EHD will require review and approval of the workplan for the proposed scope of work. The permits must be approved prior to drilling the boring. The drilling subcontractor will contact Underground Service Alert 48 hours prior to conducting fieldwork to notify local utilities of our proposed subsurface assessment. TASK 2.0 FIELD ACTIVITIES MONITORING WELL INSTALLATION Three (3) monitoring wells will be installed at the proposed locations shown on Plate 2. The proposed well locations have been selected to address groundwater conditions upgradient and downgradient of the subject site, and to determine groundwater gradient during the time of sampling. The soil borings will be drilled with a truck mounted drill rig equipped with 8-inch diameter hollow stem augers. During advancement of the soil borings, soil samples will be collected at five-foot intervals for lithologic classification. Lithologic classification will be based on the Unified Soil Classification System (USCS). All equipment used in the drillin_ and installation procedures will be cleaned and/or decontaminated as described in Appendix 4��blye� 16 During the advancement of the boring, soil samples will be collected at five foot intervals for lithologic classification and qualitative field screening. Lithologic classification will be based on the Unified Soil Classification System (USCS). In accordance with SJC EHD policies, at this time we propose to submit one (1) soil sample from every 15 feet (or change in lithology) and two (2) soil samples from the bottom of the vadose zone for quantitative chemical analyses from the soil boring. Currently, based on our experience, we anticipate groundwater in the vicinity of the project site to be present at a depth 02001PROP.ENV/ST04P347/KS:ss Page 2 of 8 Copyright 2004,Kleinfelder,Inc. August 16,2004