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• Mr Harlin Knoll <br /> Page 2 <br /> The groundwater sample collected from well MW5 contained elevated levels of petroleum <br /> hydrocarbons, BTEX and TPHG were detected at concentrations of 10,000 parts per billion (ppb), <br /> 7,000 ppb, 1,700 ppb, 12,000 ppb, and 80,000 ppb, respectively MWl contained BTEX and TPHG <br /> at concentrations of 39 ppb, 16 ppb, 49 ppb, 36 ppb, and 1,900 ppb, respectively No BTEX or <br /> TPHG were detected in wells MW4 or MW8 MTBE was detected at 5 ppb in well MW1 No <br /> oxygenate compounds were detected above laboratory method detection limits in other wells <br /> Analytical results are summarized in Tables 2 and 3 Laboratory data sheets and chain of custody <br /> documentation are included in Attachment B Figure 3 shows the estimated extent of dissolved <br /> benzene in groundwater <br /> The next quarterly monitoring and sampling is scheduled for February 1998 and will include <br /> monitoring depth to water in all site wells, purging and sampling wells MW I, MW3, MW4, MWS, and <br /> MW8, and analyzing samples for TPHG and BTEX <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> regarding the site <br /> Sincerely, <br /> Ground Zero Analysis, Inc <br /> ' , <br /> -1 ED Gf�! <br /> John P Lane [�� o <br /> Senior Geologist � GREGORY P. cNa <br /> r,� STAHL <br /> No 5023 4L <br /> Gregory P Stahl, RG 5023 �lqT� ��' <br /> CA Certified Hydrogeologist 264 OF CAt1F4Q <br /> JPL <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr James Lewis, Esq <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> sround"umew>o 6nmlrcporU\4gmi997 aoc <br />