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First Quarter 1993 Monitoring Report <br /> Laidlaw Corp , 1444 Tillie Lewis dr, Stockton,CA <br /> Project No 150002 <br /> Page 3 <br /> To date Laidlaw Corporation has performed quarterly groundwater monitoring and sampling for <br /> a period of 23 months A review of analytical data from the previous four sampling events <br /> (beginning March 1992) indicate well MW1 contained only TPHG (140 ppb) during March <br /> 1992, and well MW4 contained trace levels of aromatic compounds during March and August <br /> of 1992 <br /> Due to the consistent non-detectable to very low levels of contaminants in wells MW1, MW4, <br /> MW5, and MWb, RESNA, on behalf of Laidlaw Corporation, proposes the sampling frequency <br /> of these wells be modified from quarterly to semi-annually Monitoring wells MW2 and MW3 <br /> will continue to be sampled quarterly Monitoring and sampling reports will continue to be <br /> submitted on a quarterly basis <br /> If you have any questions regarding this project please contact John Lane at our Escalon office <br /> (209) 838-3507 <br /> Respectfully, <br /> RESNA industries, Inc <br /> Jo n P Lane <br /> Project Geologist <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> TJL/ggk <br /> Attachments <br /> PC Rod Nelson, Laidlaw Corporation <br /> Elizabeth Thayer, RWQCB <br /> QUARTLYIIQR-1993 FNL <br />