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PUBLIC HEALTH S'ERV'ICES <br /> SAN JOAQUIN COUNTY i <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 <br /> s � � <br /> 209/468-3420 L; <br /> DALE STEELE <br /> CALTRANS DEC 2 9 1997 <br /> PO BOX 2048 <br /> STOCKTON CA 95201 <br /> Re: Caltrans Stockton Maintenance Facility Site Code: 1018 <br /> 1604 South "B" Street,Stockton CA 95205 <br /> San Joaquin County, Public Health Services,Environmental Health Division (PHS/EHD) has <br /> completed review of the "Second Quarter 1997 - Groundwater Monitoring Report" dated <br /> September 4, 1997 and prepared by Professional Service Industries. PHS/EHD has prepared the <br /> following comments for your consideration and response. <br /> On May 27, 1997, a Professional Service Industries representative measured the depth to water in <br /> monitoring wells,MW - MW 12 and vapor extraction wells,VWI and VW2. Groundwater <br /> samples were collected on May 27 through May 29, 1997. The groundwater depth had increased <br /> five feet since the site was last monitored during fourth quarter 1996. The report included the <br /> conclusion that the concentrations have typically decreased since the previous quarters sampling <br /> event. Please note that with the exception of the vapor extraction wells all of the existing <br /> groundwater monitoring wells are screened below the current groundwater level. <br /> The summary table of the analytical results contained several errors and omissions. Please note <br /> that the laboratory report indicated that 1.5 ppb MTBE was detected in the sample collected from <br /> MW3, rather than the 2.0 which was reported on the summary table. The table contained <br /> numerous errors of the date of sample collection. The summary table should include the <br /> duplicate results. The lab data sheet for the EPA Method 8260 analysis of the sample collected <br /> from VW2 was not included. Additionally,please provide an explanation for the calculation of <br /> MTBE concentration noted by EPA Method 8260 analysis of the sample collected from VW1. <br /> PHS/EHD requested in correspondence dated July 24, 1997 that the following correction be made <br /> which was not reflected in the above referenced report. Table 1 of the "Fourth Quarter 1996" <br /> report erroneously indicated that 3.6 ppb toluene was detected in the sample collected from <br /> MW11, when in fact 3.8 ppb toluene was detected according to the Advanced Technology <br /> Laboratories report which was included. <br /> As PHS/EHD indicated in correspondence dated July 3, 1996,additional monitoring data would <br /> be necessary prior to PHS/EHD's approval of the installation of the two additional monitoring <br /> wells which were proposed downgradient and crossgradient of MW 11. The most recent <br /> groundwater information available would suggest that their installation is warranted. PHS/EHD <br /> has directed Caltrans to submit a drilling permit application and$89 fee which has not been <br /> submitted. <br /> Quarterly sampling of the monitoring wells shall be initiated immediately and shall continue until <br /> such time as PHS/EHD directs Caltrans otherwise. <br /> A Division of San Joaquin County Health Care Services <br />