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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Yo._ :.coG Unit Supervisors <br /> R <br /> ran <br /> Donna K.He , .E.H.S. Carl Borgman,R.E.H.S. <br /> Q_ 304 East Weber Avenue, Third Floor <br /> �. Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> ,�.. �P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 6 Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> B M SAMSON MAR 2 2 2002 <br /> SUTTER OFFICE CENTER <br /> 2001 UNION STREET #300 <br /> SAN FRANCISCO CA 94123 <br /> RE: 242 Sutter Street SITE CODE: 9327 <br /> Stockton CA 95202 <br /> APN 139-250-05 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed the <br /> "Groundwater Monitoring and Extent of Residual Hydrocarbons" report dated February <br /> 2002 that was prepared on your behalf by Hydro-Geo Consultants, Inc., and has the <br /> following comments. <br /> The report documents the installation of three groundwater monitoring wells on August 2, <br /> 2001, and a geoprobe direct push site investigation and groundwater monitoring and <br /> sampling event that took place on January 31, 2002. The report also included a well <br /> survey for the area surrounding the site. <br /> The monitoring wells were installed to 40-feet below surface grade (bsg), to intercept first <br /> groundwater. Soil samples for analysis or logging were not collected during the drilling of <br /> the boreholes for the wells. The wells were first monitored and sampled on September <br /> 10, 2001. Analytical results from the two sampling events that have occurred to date were <br /> similar, with petroleum hydrocarbon contamination detected in MW-1 only, at quantities up <br /> to 18,000 parts per billion (ppb) total petroleum hydrocarbons as gasoline (TPHg), 9,000 <br /> ppb TPH as diesel and 360 ppb benzene. <br /> Three direct push soil borings were advanced during this investigation; borings J and <br /> were advanced onsite, boring H was advanced offsite to the east. The total depth of each <br /> boring was 90-feet bsg. The report states that soil samples were collected from the <br /> borings every ten feet, but boring logs documenting this were not included in the report. <br /> Only three soil samples were submitted for laboratory analysis, the samples collected at <br /> 20, 30 and 40-feet bsg from offsite boring H. Results of the analysis were non-detect for <br /> all constituents analyzed. Two groundwater samples were collected from each of the <br /> three borings. The samples were collected from the intervals of 46-50 feet bsg and 86-90 <br /> feet bsg. Significant quantities of contamination were detected in both water samples <br /> collected from boring J, and in the 46-50 foot sample from boring I. The deeper sample <br /> from boring I had minor detections only. Both groundwater samples collected from boring <br /> H were non-detect for all constituents analyzed. <br />