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Manteca Unified School Districis <br /> Soil&Groundwater Investigation eport <br /> Page 2 <br /> ' detected in the soil samples, however, TPH-D was detected at concentrations of <br /> 13 mg/kg (stockpile) and 130 mg/kg (excavation bottom) <br /> ' A "Notice of Responsibility" letter, dated January 8, 1998, was sent to Manteca <br /> Unified School District by PHS/EHD, requesting additional assessment of the <br /> ' diesel contamination In response to the request a single temporary well (B1/TW- <br /> 1) was advanced to 18 feet below ground surface (bgs), at the location of the <br /> former UST Four soil samples were collected from below a depth of 7 feet A <br /> ' groundwater sample was collected from the temporary well casing installed in the <br /> boring <br /> Total Petroleum Hydrocarbons - Diesel (TPH-D) were detected in three of the <br /> four soil samples and the groundwater sample TPH-D concentrations in soil <br /> ranged from 168 to 5 34 mg/kg, from soil samples collected at depths of 8 and 13 <br /> feet TPH-D was not detected in the bottom hole sample at 18 feet below grade <br /> No other contaminants were reported in the soil samples MTBE was not detected <br /> by method 8260 Groundwater samples collected from B1/TW-1 had a reported <br /> ' concentration of 389 µg/1 TPH-D <br /> Table of Laboratory Sample Results (Kleinfelder, November 5, 1998) <br /> Sam le I D Gasoline I Diesel I Benzene I Toluene I E-Benzene I Xylenes 8260 <br /> 18296-8 to 8 5' ND 168 mg/Kg mg/KgND ND ND ND ND ie <br /> 18296-12 5 to 13 ND 43 1 mgfKg ND ND ND ND NA <br /> 18297-13 to 13 5 ND 5 34 mg/Kg mg/KgND ND ND ND ND <br /> 18294-18 to 18 5 NA ND ND ND ND ND NA <br /> ' 18293-Groundwater NA 0 389 mg/K ND ND ND ND ND <br /> ND=Non Detect <br /> 2 0 SCOPE OF WORK <br /> On November 29, 2001 M J Kloberdariz & Associates, along with V&W Drilling, Inc , <br /> drilled 3 soil borings in the vicinity of the previously disclosed contamination to a depth <br /> at least ten feet below groundwater (Figure 3) All three of the bonngs were completed <br /> ' as 2-inch groundwater monitoring wells At least one of the monitoring wells was <br /> located in the suspected down gradient direction from the former tank pit The other <br /> wells surround the former tank site to demonstrate the lateral limits of the soil and <br /> ' groundwater contamination <br /> Three soil samples were obtained from each boring for laboratory analysis including a <br /> sample from the capillary zone No apparent contamination was noted during drilling so <br /> samples were collected a 15, 20 and 30-foot depths The nearby domestic well was also <br /> sampled at this time <br /> 1 <br />