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California*gional Water Quality Conol Board <br /> \- Central Valley Region 0 <br /> v Karl E. Longley,ScD, PE,Chair <br /> Linda S.Adams Sacramento Main Office Arnold <br /> Secreraryfor <br /> ment <br /> Environal 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Pro n ,r Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> hop.//www.%vaterboards.ca.gov/centralvalley <br /> 31 January 2007 <br /> Ms. Kathleen M. Minahan <br /> LESCO, Inc. <br /> 1301 East 9th Street, Suite 1300 <br /> Cleveland, Ohio 44114-1849 <br /> REVIEW OF INVESTIGATION REPORT, LESCO INC, 2829 AND 2935 WEST <br /> WASHINGTON STREET, PORT OF STOCKTON, SAN JOAQUIN COUNTY <br /> Lesco, Inc. operated a fertilizer formulation and distribution facility on a 5-acre property <br /> that it leases at the Port of Stockton. Prior to Lesco's tenancy, Tri-Delta Fertilizer and <br /> Delft Fertilizer also manufactured and distributed fertilizers from this property. Lesco <br /> asked Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff to assist it in characterizing the site and pursuing no further action status. <br /> Lesco provided the 31 October 2006 Facility Investigation Summary Report <br /> (Investigation Report) prepared by ERM. This letter comments on the findings of the <br /> Investigation Report. <br /> As documented in the Investigation Report, soil samples were obtained from two feet <br /> below ground surface (bgs) and from just above the first water table from 12 borings. A <br /> grab groundwater sample was collected from each of the borings, which were advanced <br /> to a depth of 12 feet bgs. Groundwater was encountered about six feet bgs. <br /> Pesticides, Herbicides, and Metals <br /> Chlorinated herbicides were not detected in soil samples, but several were detected in <br /> groundwater samples. Dicamba was detected in four grab groundwater samples, in <br /> concentrations ranging between 1.2 ug/I and 29.2 ug/I. These concentrations are an <br /> order of magnitude less than the water quality objective of 210 ug/I for dicamba. The <br /> groundwater sample from SB-13, near the former mixing area, also contained <br /> dichlorprop and 2,4-dichlorophenoxyacetic acid (2,4-D). A water quality objective has <br /> not been established for dichlorprop, and the concentration of 2,4-D is less than the <br /> water quality objective. A table of water quality objectives and soil screening levels is <br /> found in Table 1, which is attached to this letter. <br /> Organophosphate compounds were not detected in soil or groundwater samples. <br /> Organochlorine compounds, however, were found in soil. Dieldrin, DDT, and DDE <br /> were found in the two-foot samples from borings SB-14 and SB-09 at concentrations <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />