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Me, uY e 134nu nd Lumber•Lr-ii,CI Page I 1.0 INTRODUCTION 1.1 'Background JA Steffen Robertson and Kirsten (U.S,) Inc., (SRK) has been retained to further investigate and define the on-site extent of the petrochemical contaminant plume at the Diamond Lumber facility in Lodi, Californiv. This investigation will examine groundwater flow direction and assess the extent and nature of groundwater contamination and will consist of the installation of six boreholes and four monitor wells to further delineate the extent of contamination identified in earlier studies. The investigation is to be conducted at 224 North Main, Lodi, California. The location of removed underground storage tanks,borings P1 and P2,and groundwater monitoring well M-1 are shown on the site map on Figure 1. k 1.2 Site History and Description A description of the site, t!te surrounding community, and current activities at the site arc available in the "Environmental Site Assessment"report dated September 15, 1989,prepared by Blymyer Engineers,Inc.and discussion of earlier investigation following underground storage tank (UST) removal in 1985 was completed by J.H. Kleinfeldcr and Associates and summarized in a letter to Laurie Cotulla dated August 13, 1985. 2.0 SOIL CONTAMINATION ASSESSMENT , In order to determine the lateral and vertical extent ofsoil contamination at the subject site,SRK will first install piezometers P1 and P2 as indicate on Figure 1. Drilling will be completed by g Turner Exploration, Inc., California C57 license 602720 and all investigation will be under the guidance of and certified by an SRK California certified geologist. Following identification of f t: tr groundwater gradient, SRK will then install a third boring which will be completed as a ground- water monitoring well. An SRK geologist will be on-site to oversee drilling. Soil samples will be z t = collected at 5-foot intervals using a California split-spoon sampler lined with brass tubes. All cuttings and samples will be collected for logging and testing for organic vapors with a photoionization detector (PID). r no brass tube ends will be covered with aluminum foil,capped with plastic end caps, wrapped with duct tape, labeled, and stored at 4°C. Chain-of-custody forms and laboratory analytical results will be included in the follow-up report. Th,_PID will be used on-site to detect organic vapors in the soil samples. Soil samples will also be submitted for laboratory analysis by a California certified laboratory and will be analyzed for Total Petroleum Hydrocarbons (TPH) as gasoline (Modified EPA Method #8015); benzene, toluene, xylenes, ethylbenzene (BTXE) (EPA Method #8020); and total lead (EPA Method #7421). Our laboratory of choice is North Creek Analytical, CLAP number 1267. Sicfrca Robertson and Kirsten