WASTE MANAGEMENT<WMX> HIKES CHEMLAWN <CHEM> BID Waste Management Inc said it amended its offer to buy the outstanding shares of ChemLawn Corp to 35 dlrs a share. On Thursday the company said it was prepared to bid 33 dlrs a share, up from its original 27 dlrs a share offer. As a result of the price increase, made through Waste Management's wholly owned subsidiary, WMX Acquisition Corp, the offer has been extended and the withdrawal rights will not expire at midnight EDT April Two, unless further extended. Waste Management also said it amended its offer to provide that the tender offer price will not be reduced by ChemLawn's 10 cts a share dividend payable to holders of record April 1, 1987.