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TIVI o""PR4 1 NTAL H '7'FRV10E 1.Tdi 95 OCT 17 ASI 9: 46 1 August 1995 Ms Linda Turkatte San Joaquin County Public Health Services Environmental Health Department P O Box 338 Stockton, CA 95201-0388 Re: Cone Penetration Test (CPT)/Hydropunch Survey Results and Work Plan Addendum 521 North Cherokee Lane, Lodi, Califonda Site Code: 1324 Dear Ms Turkatte Results In December 1995, Gregg In-Situ collected CPT data from 14 locations (Plate 1) Refusal was common on the north side of the site and on the Del Rancho Motor Inn property allowing 10 of the 14 test locations to be advanced to groundwater At those locations, the CPT results indicate that the soil underlying the tested area is predominantly sandy with minor interbedded silts and clays In addition, it appears that the soil column becomes generally finer grained to the south A copy of the Gregg In-Situ report is attached Cross sections will be constructed after drilling data verifies the CPT lithologic data Hydropunch° groundwater samples were collected at the 10 locations which did not encounter refusal prior to groundwater Pore pressure dissipation tests were conducted at eight of the 10 locations to estimate the depth to groundwater and ensure adequate submersion for sample collection Depth to groundwater was approximately 50 feet below ground surface (bgs) during the test dates The total depth of the Hydropunch° sampler was 54 feet bgs at each of the sampled locations The analytical data from the 10 Hydropunch° samples and the groundwater sample collected from MW-2 generally concur with the field observations made during sample collection Plume limits appear to be defined (lacking monitor well confirmation) in each of the compass directions with the exception of the quadrant south through west The analytical data for TPH as gasoline and benzene is plotted on Plate 2 A copy of the Analytical Laboratory report is attached Based on the data collected thus far, I recommend destroying MW-1 as it is no longer serviceable, and is apparently well within the groundwater contaminant plume, and, installing additional monitor wells both onsite and offsite to provide the plume definition verification required for