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r F �S r s r ' September 17, 1996 IP 9 QJ 5�.� Mr Ken Gillies Cnlhes Trucking P O Box 8303 Stockton, CA 95208 Subject: Gillies Trucking Preliminary Third Quarter Report 3931 Newton Road Stockton, CA Dear Mr Glhes As directed by Mr Steve Sasson on August 19, 1996, Upgradient Environmental has prepared this interim report to bnefly summanze the results of the subsurface investigation that was conducted during the third quarter of 1996 The report is prelir unary, because not all of the work that was proposed in our work plan could be completed A final report will be prepared as soon as written pernussion to drill on the adjacent parcel (3851 Newton Road, Figure 1) has been received and all drilling and sampling on that property has been completed Because contamination is more extensive than we previously believed, the additional dulling will be necessary to fully define the extent of contamination Three of five proposed borings were drilled, and two of these were completed as groundwater monitoring wells (Figure 2) All borings were located on the Gies properly because the adjacent property owner was unavailable to authorize access to her property The first boring (GT-4) was drilled on August 16 near the estimated northern edge of the sort contaminant plume A hydropunch was used to collect a groundwater sample, which was transported to Excelchem Laboratory for analysis on 24-hour turnaround The augers were left in the boring overnight, pending the laboratory analysis Strong hydrocarbon odors were evident in soil samples from approximately 30 feet to the bottom of the boring at 55 feet, and a very high diesel concentration was detected in the water sample (Table 1 and Appendix A) These results imphed that GT-4 was not as near to the fnnge of the contaminant glume as had been presumed Therefore, this boring was abandoned and grouted to the surface on August 19 A second boring (GT-5) was drilled 40 feet to the northwest of GT4 on August 19, while an on-site mobile laboratory analyzed the soil samples from GT4 The laboratory results are shown in Table 2 Hydrocarbon odors were not noticed in the samples from GT-5 except in GT-5-45', winch , along with GT-5-40' and GT-5-50', was delivered to the mobile laboratory A hydropunch was used to collect a water sample, which was also delivered to the laboratory Diesel was detected in both GT-5- 45' and the water sample, but at much lower concentrations than in boring GT-4 (Tables 1 and 2) Upgradient concluded that GT-5 was near the northern edge of the contaminant plume, and completed it as a monitoring well The construction details are shown m Appendix B