Laserfiche WebLink
%TC <br /> A S S O C I A T E S I N C <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA method 8020 and TPHg by EPA <br /> method modified 8015 <br /> Laboratory analyses detected concentrations of one or more petroleum hydrocarbon consistuents <br /> in the samples collected from well MW3 and MW4 The water sample collected from well MW4 <br /> reported benzene at 28 parts per billion (ppb) which is above the 1 ppb California Primary <br /> Maximum Contaminant Level (MCL) for drinking water Groundwater samples collected from <br /> well MW2 and the Supply Well contained no detectable concentrations of BTEX or TPHg These <br /> analytical results are generally consistent with historical levels Analytical results are summarized <br /> in Table 1 Laboratory reports and chain-of-custody documentation are presented in Attachment <br /> 2 <br /> In response to PHS/EHD correspondence dated January 6, 1998, an alternative sampling method <br /> will be employed in order to collect a groundwater sample from within the Supply Well's casing <br /> The total depth of this well will also be measured as requested to help evaluate the completion <br /> depth of the well It is anticipated these tasks will be incorporated with the first quarter 1998 <br /> groundwater sampling activities <br /> In accordance with PHS/EHD correspondence dated December 27, 1993, the sampling schedule <br /> of MW 1 has been reduced to annual and wells MW5 and MW6 to semi-annual Wells MW2, <br /> MW3 and MW4 will continue to be sampled quarterly Additionally, the nearby Supply Well will <br /> be sampled quarterly This schedule is based upon historical groundwater analytical data <br /> If you have any questions regarding this project, please contact Tom Lutterman at our Modesto <br /> office (209) 579-2221 <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> Tom J Lutterman <br /> Project Geologist �RQrSSIQ�I�� <br /> 11NErF <br /> VIOL <br /> Jeanne Hornsey, P E0.CC 7�10 x <br /> CA Registered Civil Engineer No C 47410 Epp_ IZ�1112 <br /> . - <br /> OF C�& <br /> w1943261quardyl4gr-1997 doc <br />