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[t 1%1Rt <br /> May 12, 1997 <br /> ARCO ANNUAL GROUNDWATER MONITORING REPORT <br /> iFacility No 02076 Address 800 Kettleman Lane, Lodi, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person —EMCON/Jay R Johnson <br /> Consultant Project No 20805-144 005 <br /> Primary Agency/Regulatory ID No Mary Meays, San Joaquin County Public Health Services <br /> WORK PERFORMED <br /> 1 Performed annual groundwater sampling <br /> 2 Compiled and evaluated groundwater monitoring data <br /> 3 EMCON prepared and submitted a site closure report (July 26, 1996) to San Joaquin County Public <br /> Health Services (SJCPHS) In response, the SJCPHS requested that additional information to be <br /> incorporated with the closure report The additional information requested should include fate and <br /> transport, mass evaluation of BTEX constituents in soil, and results of MTBE data from groundwater <br /> monitoring collected during the first quarter 1997 <br /> WORK PROPOSED <br /> 1 EMCON will submit the additional data that SJCPHS requested <br /> Current Phase of Project Monitoring <br />. Frequency of Groundwater Sampling Annual <br /> Frequency of Groundwater Monitoring Annual <br /> Is Free Product(FP) Present On Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 51 21 to 54 50 <br /> Groundwater Flow Direction Northwest <br /> Groundwater Gradient 001 <br /> DISCUSSION: <br /> Results of this monitoring event indicated that levels of dissolved gasoline hydrocarbons are consistent <br /> with levels detected during previous sampling events Groundwater gradient is consistent with previous <br /> sampling events Groundwater elevation decreased approximately 0 29 foot from the previous sampling <br /> event (February 2, 1996) <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Figure 1 Site Location Map <br /> • Figure 2 Generalized Site Plan <br /> • Figure 3 Groundwater Contour Map (February 27, 1997) <br /> • Appendix A Sampling and Analysis Procedures <br /> Appendix B Laboratory Analysis Reports and Cham-of-Custody Records <br /> cc Elizabeth Thayer, California Regional Water Quality Control Board <br /> SAON\PJUN0805\08051440 5AA-95\prz 1 <br />