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Chevron Products Company Page 6 <br /> Chevron Service Station 9-4275 2905 Benjamin Holt Drive Stockton California May 20 2002 <br /> DISCUSSION OF FINDINGS <br /> Based on the data collected during this assessment, relatively low concentrations of petroleum <br /> hydrocarbons are present in the groundwater along the eastern side of Plymouth Road and <br /> generally decrease to below laboratory detection limits with depth Vertical definition was <br /> achieved in all of the borings <br /> Groundwater samples from the City of Stockton Municipal Well No 10 analyzed for TPHg, <br /> BTEX and MtBE indicate concentrations below laboratory detection limits during the six months <br /> of monitoring <br /> SECOR will continue quarterly monitoring and sampling <br /> If there are any questions regarding the contents of this site assessment report or work plan, <br /> please call Bob Jackson of SECOR at (916) 861-0400 extension 283 or Scott Gable at extension <br /> 231 <br /> Sincerely, <br /> SECOR International Incorporated <br /> V7 <br /> Bob W Jackson JrScott Gable, G <br /> Staff Geologist Senior Geologist <br /> Attachments <br /> Figure 1- Site Location Map <br /> Figure 2 - Site Plan With CPT Boring Locations <br /> Table 1 - Groundwater Analytical Data <br /> Table 2 - Municipal Well # 10 Groundwater Analytical Data <br /> Table 3 - Historical MtBE Analytical Data <br /> Attachment A - Summary of Previous Investigations <br /> Attachment B - Municipal Well 10 Water Well Drillers Report <br /> Attachment C - Field and Laboratory Procedures <br /> Attachment D - Cone Penetration Test Data <br /> Attachment E- 1St Quarter 2002 Groundwater Quarterly Monitoring Report <br /> Attachment F-Laboratory Analytical Reports and Chain-of-Custody Record <br /> Attachment G - Mass Flux /Mass Discharge Calculation <br /> Attachment H - Chemical Concentration vs Time <br /> Attachment I - Chemical Concentration vs Distance <br /> cc Robert Cochran, Chevron Products Company, San Ramon <br /> Marty Hartzell, Regional Water Quality Control Board, Sacramento <br /> I 1Chevron1942751REPQRTS12001 CPT SA and Muni sampling Rev A doc <br />