FIELD DOCUMENTS AND WORK PLANS 1988

Home Browse Search

• 0 MARLEY COOLING TOWER COMPANY STOCKTON, CALIFORNIA FACILITY SOUTH YARD STORM WATER SAMPLING SCOPE OF WORK 1.0 INTRODUCTION South Yard cleanup efforts have been beneficial and effective in reducing chromium, copper, and arsenic contamination of storm water runoff from Marley Cooling Tower Company's (MCTC's) South Yard. The reduction of contaminent concentrations is evidenced by previous sampling activities presented in the South Yard Storm Water Runoff Evaluation Report dated May, 1988. The potential sources of the offsite storm water contamination include the South Yard storm water runoff, residue existing in the storm water pipe drains and culverts, and offsite ditch soils adjacent to the South Yard. Additional storm water sampling is proposed to confirm or discount the South Yard as a source of offsite storm water contamination. This sampling plan is designed to investigate the South Yard storm water runoff as a source of the contamination. A sampling contractor will collect composite storm water runoff samples while simulating storm water runoff conditions. The sampling contractor will thoroughly wash down designated sampling areas to simulate storm water runoff and expedite the focused sampling investigation. The sampling locations are targeted for areas which had been used for treated wood storage prior to the extensive South Yard cleanup efforts of 1987. Figure 1 illustrates a general plan of the South Yard and the proposed sampling areas. 2.0 PROPOSED SAMPLING AREAS The proposed storm water sampling areas were chosen based upon previous treated wood storage locations and existing patterns of South Yard runoff as illustrated on Figure 1. Although the South Yard is relatively flat, existing storm water runoff drainage patterns can be used to define segregated runoff areas. 1